Mathematics High School

Comparing Ratios Using Fractions
Compare 4:10 and 12:20 using fractions. Which ratio is
smaller? How do you know?

Answers

Answer 1

Answer:

4:10

Step-by-step explanation:

4:10 = 4/10 = 2/5

12:20 = 12/20 = 6/10 = 3/5.

So 4:10 is smaller than 12:20 because 2/5 is less than 3/5.

Answer 2

Answer:

4:10

Step-by-step explanation:

First, I wrote each ratio as a fraction. Then I found a common denominator of 20. The fraction 4/10 is 8/20. Comparing numerators, 8 is less than 12, so the ratio 4:10 is smaller.

Related Questions

let r be the relation r = {(1, 1),(1, 2),(2, 3),(3, 1),(3, 4) (4,2)}. find −r2

Answers

Given the relation, value of −r2 is {(3, 1), (3, 3), (2, 3), (1, 4)}.

To find −r2, we first need to find r2, which is the composition of the relation r with itself. The composition of r with itself is given by:

r2 = {(a, c) | ∃b ∈ A, (a, b) ∈ r and (b, c) ∈ r}

where A is the set of all elements in the relation r.

Using this definition, we can calculate r2 as follows:

r2 = {(1, 3), (3, 3), (3, 2), (4, 1)}

Next, to find −r2, we simply take the inverse of each ordered pair in r2 and reverse the order of the pairs. Thus, we have:

−r2 = {(3, 1), (3, 3), (2, 3), (1, 4)}

Therefore, the relation −r2 is {(3, 1), (3, 3), (2, 3), (1, 4)}.

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Nala is running toward the entrance at a speed of 9. 2 meters per second. The entrance is 180 meters away. What’s the functions formula?

Answers

9.2=MPS and 180=MA so multiply MPS by MA

9 The dosage of a certain medicine is 0. 05 mg/kg of weight. Tom weighs 185 lbs.

a) How many milligrams of the medicine should he take?

b) If the medicine costs $1. 95/mg, what will his dosage cost?

What is The answer

Answers

a) 4.2 milligrams of the medicine should he take.

b) If the medicine costs $1. 95/mg, then his dosage cost is $8.19

a) To calculate the dosage of a particular medicine, you need to know the weight of the patient and the dosage amount per kg of weight.1 pound = 0.453592 kg.

So Tom weighs 185 x 0.453592 = 83.91402 kg.

Multiply his weight by the dosage amount per kg to get the dosage amount for Tom:

83.91402 kg x 0.05 mg/kg = 4.1957 mg.

Round this to the nearest tenth of a milligram to get 4.2 mg. So, the answer is 4.2 mg.

b) The cost of the medicine per milligram is $1.95/mg, and the dosage amount for Tom is 4.2 mg.

So you can multiply the cost per milligram by the dosage amount to get the total cost:

= $1.95/mg x 4.2 mg

= $8.19.

So, the answer is $8.19.

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the maximum speed on many roads in the us is 65 mi/hr. how many meters per second (m/s) is this speed? (1 mi = 1.609 km)

Answers

To convert 65 mi/hr to meters per second, you can follow these steps:

1. Convert miles to kilometers: 65 mi * 1.609 km/mi = 104.585 km
2. Convert kilometers to meters: 104.585 km * 1000 m/km = 104,585 m
3. Convert hours to seconds: 1 hr * 3600 s/hr = 3600 s

Now, divide the total meters by the total seconds to get the speed in meters per second:

104,585 m / 3600 s ≈ 29.05 m/s

So, the maximum speed of 65 mi/hr is approximately 29.05 meters per second.

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The weights of rabbits on an island, measured in pounds, are normally distributed with mean 4.5 and standard deviation 3.1. In each case, identify the calculator command that would answer the given question. The chances that a randomly selected rabbit weighs at least 6 pounds. normalcdf(6,999,4.5,3.1) The chances that 15 randomly selected rabbits have an average weight of at least 6 pounds. [Choose] The chances that 15 randomly selected rabbits have a total weight less than 50 pounds. normalcdf(6,999,4.5,3.1)

Answers

To find the chances that 15 randomly selected rabbits have an average weight of at least 6 pounds, we can use the calculator command normalcdf(-999,50,67.5,10.1) to find the probability that the total weight of 15 rabbits is less than 50 pounds, we need to use the central limit theorem.

According to the theorem, the sample means of large enough samples from a population with any distribution will follow a normal distribution with mean equal to the population mean and standard deviation equal to the population standard deviation divided by the square root of the sample size. Therefore, the mean of the sampling distribution of the sample means for 15 rabbits would also be 4.5, but the standard deviation would be 3.1/sqrt(15) = 0.8. We can use the calculator command normalcdf(6,999,4.5,0.8) to find the probability that the average weight of 15 rabbits is at least 6 pounds. To find the chances that 15 randomly selected rabbits have a total weight less than 50 pounds, we need to use the central limit theorem again. The total weight of 15 rabbits would be the sum of their individual weights. The sum of independent random variables with the same distribution also follows a normal distribution, with mean equal to the sum of the individual means and standard deviation equal to the square root of the sum of the variances. Therefore, the mean of the sampling distribution of the sum of 15 rabbit weights would be 15*4.5 = 67.5, and the standard deviation would be sqrt(15*3.1^2) = 10.1.

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One question from a survey was "How many credit cards do you currently have?" The results of the survey are provided. Complete parts (a) through (g) below. Describe the shape of the distribution. The distribution has one mode and is skewed right.(f) determine the probability of randomly selecting an individual whose number of credit cards is more than two standard deviations from the mean. is this result unusual?'

Answers

This result is not necessarily unusual, since the dataset has a few outliers with a large number of credit cards. However, it does suggest that someone with more than 12 credit cards is relatively rare in this dataset.

(a) The minimum and maximum number of credit cards are 1 and 12, respectively.

(b) The range is the difference between the maximum and minimum values, which is 11.

(c) The median is the middle value of the dataset when it is arranged in ascending or descending order. Since there are 100 values, the median is the average of the 50th and 51st values. Using the table, we see that the 50th and 51st values are both 4, so the median is 4.

(d) The mode is the value that appears most frequently in the dataset. From the table, we can see that the mode is 2.

(e) The distribution has one mode and is skewed right. This means that most people have fewer credit cards and there are a few people with a large number of credit cards.

(f) To find the number of credit cards that is more than two standard deviations from the mean, we need to calculate the mean and standard deviation first. Using the table, we can find that the mean is (259+208+309+267+260+216+255+317+202+296+201+225+262+301+240+228+302+228+228+290+228+216)/22 = 254.36 and the standard deviation is 38.37.

To find the number of credit cards that is two standard deviations from the mean, we multiply the standard deviation by 2 and add it to the mean: 254.36 + (2 * 38.37) = 331.1.

We can find this probability by subtracting the probability of selecting someone with 12 or fewer credit cards from 1:

P(X > 12) = 1 - P(X ≤ 12)

Using the table, we can see that there are 99 individuals with 12 or fewer credit cards, so the probability of selecting someone with 12 or fewer credit cards is 99/100 = 0.99. Therefore, the probability of selecting someone with more than 12 credit cards is:

P(X > 12) = 1 - 0.99 = 0.01.

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The average battery life of 2600 manufactured cell phones is recorded and normally distributed. The mean battery life is 14 hours with a standard deviation of 0.9. Find the number of phones who have a battery life in the 14 to 14.9 hour range

Answers

Approximately 888 phones have a battery life in the 14 to 14.9 hour range.

To find the number of phones that have a battery life in the 14 to 14.9 hour range, we need to calculate the probability of a phone having a battery life within this range.

We know that the mean battery life is 14 hours and the standard-deviation is 0.9. From this, we can calculate the z-score for the lower and upper limits of the range using the formula:

z = (x - μ) / σ

For the lower limit, x = 14 and μ = 14, σ = 0.9:

z = (14 - 14) / 0.9 = 0

For the upper limit, x = 14.9 and μ = 14, σ = 0.9:

z = (14.9 - 14) / 0.9 = 1

We can then use a standard normal distribution table or a calculator to find the probability of a phone having a battery life within this range.

Using a standard normal distribution table, we find that the probability of a phone having a battery life between 14 and 14.9 hours is 0.3413.

Finally, to find the number of phones with a battery life in this range, we multiply the probability by the total number of phones:

2600 * 0.3413 = 888

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find the values of the following expressions: a) 1⋅0¯ = 1 b) 1 1¯ = 1 c) 0¯⋅0 = 0 d) (1 0¯¯¯¯¯¯¯¯) = 0

Answers

a. 1 multiplied by 0 with a bar over it is also equal to 0. b. the final value of the expression is 0. c. 0 with a bar over it multiplied by 0 is also equal to 0. d. we cannot give a definite value for this expression without additional context.

a) The value of the expression 1⋅0¯ is 0.

When we multiply any number by 0, the result is always 0. Therefore, 1 multiplied by 0 with a bar over it (representing a repeating decimal) is also equal to 0.

b) The value of the expression 1 1¯ is 0.

When a number has a bar over it, it represents a repeating decimal. Therefore, 1.111... is the same as the fraction 10/9. Subtracting 1 from 10/9 gives us 1/9, which is equal to 0.111... (or 0¯). Therefore, the value of 1 1¯ is 1 + 1/9, which simplifies to 10/9, or 1.111.... Subtracting 1 from this gives us 1/9, which is equal to 0.111... (or 0¯), so the final value of the expression is 0.

c) The value of the expression 0¯⋅0 is 0.

When we multiply any number by 0, the result is always 0. Therefore, 0 with a bar over it (representing a repeating decimal) multiplied by 0 is also equal to 0.

d) The value of the expression (1 0¯¯¯¯¯¯¯¯) is undefined.

The notation (1 0¯¯¯¯¯¯¯¯) is ambiguous and could be interpreted in different ways. One possible interpretation is that it represents the repeating decimal 10.999..., which is equivalent to the fraction 109/99. However, another possible interpretation is that it represents the mixed number 10 9/10, which is equivalent to the improper fraction 109/10. Depending on the intended interpretation, the value of the expression could be different. Therefore, we cannot give a definite value for this expression without additional context.

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evaluate the complex integral 1/(z^3 - 8) where c is the counterclockwise, circular contour |z-1| = 2

Answers

Answer: We can evaluate this integral using the residue theorem. First, we need to find the poles of the integrand within the contour |z-1| = 2.

We have:

z^3 - 8 = (z - 2)(z^2 + 2z + 4)

The roots of the quadratic factor are:

z = (-2 ± sqrt(-4*4))/2 = -1 ± i sqrt(3)

None of these roots are inside the contour, so the only pole is z = 2.

The residue of 1/(z^3 - 8) at z = 2 is:

Res(1/(z^3 - 8), z=2) = 1/(3*2^2) = 1/12

By the residue theorem, the integral is:

∫(|z-1|=2) 1/(z^3 - 8) dz = 2πi Res(1/(z^3 - 8), z=2) = 2πi/12 = πi/6

Therefore, the value of the complex integral is πi/6.

Use calculus to find the area A of the triangle with the given vertices.
(0, 0), (4, 5), (2, 8)

Answers

The area of the triangle with the given vertices is 11 square units.

Using calculus to find the area A of the triangle with the given vertices (0, 0), (4, 5), and (2, 8), we can apply the determinant method. This method involves creating a matrix using the coordinates of the vertices and then calculating the determinant of that matrix.
First, set up the matrix:
| 1 0 0 |
| 1 4 5 |
| 1 2 8 |
Next, find the determinant of this matrix:
| 1 0 0 | | 4 5 | | 2 8 |
| 1 4 5 | = | 2 8 | = | 2 3 |
Det = 1(4*8 - 5*2) - 0 + 0 = 32 - 10 = 22
Now, the area of the triangle A can be found by taking the absolute value of half the determinant:
Area = |(1/2) * Det| = |(1/2) * 22| = 11
The area of the triangle with the given vertices is 11 square units.

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Decide whether the primary or secondary data is most suited for the hypothesis below.
There are more students in Year 9 at your school who would prefer a trip to Thorpe Park rather than a museum.
Explain your answer in the comment box.
Primary or Secondary

Answers

To accurately assess whether there are more Year 9 students who prefer a trip to Thorpe Park rather than a museum, primary data collection methods would be more appropriate.

In this case, primary data would be most suited for testing the hypothesis.

Primary data refers to information that is collected firsthand, specifically for the purpose of addressing a research question or hypothesis. In this scenario, to determine whether there are more students in Year 9 who would prefer a trip to Thorpe Park rather than a museum, it would be necessary to directly gather data from the students themselves.

This can be done through methods such as surveys, questionnaires, or interviews. By directly asking the Year 9 students about their preferences between a trip to Thorpe Park and a museum, we can collect primary data that specifically relates to the hypothesis being tested.

On the other hand, secondary data refers to information that has already been collected by someone else for a different purpose. While there may be existing secondary data that provides general information about student preferences or visitor statistics for Thorpe Park and museums, it may not provide the specific data needed to test the hypothesis in this case.

Therefore, to accurately assess whether there are more Year 9 students who prefer a trip to Thorpe Park rather than a museum, primary data collection methods would be more appropriate.

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A linear programming problem has been formulated as follows: Maximize 10 X1 20 X2 + X1 2 X2 < 100 2X1 X2 100 + X10, X2>=0 Which of the following represents the optimal solution to this problem? Select one: X2 50 a. X1 50 b. X1 50 X2 10 c. X1 100 X2 50 d. X1 50 X2 0 e. X1 0 X2 50

Answers

To determine the optimal solution to the given linear programming problem, we need to solve the problem and find the values of X1 and X2 that maximize the objective function while satisfying the constraints.

However, the problem formulation provided is incomplete and contains some errors. The objective function and constraints are not properly defined. It seems there are missing symbols and equations.

Without the correct formulation of the objective function and constraints, we cannot determine the optimal solution. Therefore, none of the options (a, b, c, d, e) can represent the optimal solution to the problem as presented.

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Amanda owns a local cupcake shop she pays 1500 each month for rent it costs her 5. 00 to make each batch of cupcakes she sells each batch for 20. 00 how many batches must she sell each month in order to make a profit write an inequality to model this situation and slove00

Answers

Let x be the number of batches Amanda must sell each month in order to make a profit.

The total cost that Amanda incurs to produce x batches of cupcakes in a month is:

Total cost = cost of each batch × number of batches= $5.00x

The total revenue that Amanda generates by selling x batches of cupcakes in a month is:

Total revenue = price of each batch × number of batches= $20.00x

To make a profit, Amanda's total revenue must be greater than her total costs.

Thus, we can write the inequality:

Total revenue > Total cost

$20.00x > $5.00x + $1,500

Simplifying the inequality,

we get:

$15.00x > $1,500

Dividing both sides by $15.00,

we get

x > 100

Therefore, Amanda must sell more than 100 batches of cupcakes each month to make a profit.

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please help !!!
1. If (x, y) = (-4, 0), find x and y.
2. If (3a , 2b) = (6, -8), find a and b .
3. In which quadrant does the point whose abscissa and ordinate are 2 and -5 respectively lie?
4. Where does the point (-3, 0) lie?
5. Find the perpendicular distance of the point P (5, 7) from (i) x- axis
(ii) y- axis
6. Find the perpendicular distance of the point Q (-2, -3) from (i) x-axis
(ii) y-axis

Answers

1. the values of x and y are x = -4 and y = 0

2. the values of a and b are a = 2 and b = -4

3. The point with abscissa 2 and ordinate -5 lies in the fourth quadrant.

4. the point (-3, 0) lies on the negative x-axis. In the x-axis, the y-coordinate is always zero.

5. For the point P (5, 7):

(i) The perpendicular distance from the x axis is 7 units.

(ii) The perpendicular distance from the y-axis is 5 units.

6. For the point Q (-2, -3)

(i) The perpendicular distance from the x-axis is 3 units

(ii) The perpendicular distance from the y axis is 2 units

How to find the answers?

Ordered pairs refers to the arrangement of 2 numbers in the form (a, b)

As used in the cartesian coordinates

a refers to a point in the x direction b refers to a point in the y direction

1. If (x, y) = (-4, 0), then x = -4 and y = 0

2. If (3a , 2b) = (6, -8), then 3a = 6 and 2b = -8

a = 2 and b = -4

The cartesian coordinates is divided into 4 quadrants. The quadrants are located by signs of the values of the coordinates as follows

first quadrant: (a, b)second quadrant: (-a, b)third quadrant: (-a, -b)fourth quadrant: (a, -b)

3. The point with abscissa 2 and ordinate -5 is compared to (a, -b), hence lies in the fourth quadrant.

4. point (-3, 0) lies on the negative x axis since y = 0, this between second and third quadrant

Perpendicular distance is the shortest distance between a point and a line or an axis measured along a line that is perpenndicular (at a right angle) to that line or axis.

In the context of a Cartesian coordinate system the perpendicular distance of a point from the x axis is the length of the vertical line segment drawn from the point to the x axis. Similarly the perpendicular distance of a point from the y axis is the length of the horizontal line segment drawn from the point to the y axis.

Bearing this in mind we can say that

5. For the point P (5, 7):

(i) The perpendicular distance from the x axis is 7 units because this is the verticl line segment

(ii) The perpendicular distance from the y-axis is 5 units as this is the horizontal line segment

6. For the point Q (-2, -3):

(i) The perpendicular distance from the x axis is 3 units because this is the vertical line segment

(ii) The perpendicular distance from the y- axis is 2 units as this is the horizontal line segment

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in a class, the teacher decides to assign groups of 3 individuals to work on a project. how many ways is this possible if there are 36 students in the class?

Answers

there are 7140 ways to form groups of 3 individuals out of 36 students.

To form a group of 3 individuals out of 36 students, we can use the combination formula:

C(36, 3) = 36! / (3! (36 - 3)!) = 36! / (6! 30!) = (36 × 35 × 34) / (3 × 2 × 1) = 7140

what is combination ?

In mathematics, combination refers to the selection of a subset of objects from a larger set, without regard to the order in which the objects appear. The number of possible combinations is determined by the size of the larger set and the size of the subset being selected.

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Rewrite the series as a series whose generic term involves x" rather than xn-2. infinity ∑ n =2 (n+2) (n+1)a_n x^n-2

Answers

The series with the generic term involving x" rather than[tex]x^{n-2[/tex] is:

∑[tex](n-1)a_n x"^{(n-2)[/tex]

We can start by replacing the index n with n+2 to get the series in terms of [tex]x^n[/tex]as follows:

∑ n=2 (n+2)(n+1)a_n [tex]x^n[/tex]-2 = ∑ (n+2)[tex]x^n[/tex](n+1)a_n

Now, we need to replace the term (n+2) in the summation with (n-2+4) to get it in terms of x" rather than [tex]x^{n-2[/tex]:

∑ (n-2+4)[tex]x^n[/tex] (n+1)a_n = ∑[tex]x^{(n-2+4)[/tex](n-2+4+1)a_(n-4+2)

Finally, we can simplify the indices to get the series in the desired form:

∑ [tex]x"^{(n-2)[/tex] (n-1)a_(n-2+2) = ∑ (n-1)a_n [tex]x"^{(n-2)[/tex]

Therefore, The series with the generic term involving x" rather than[tex]x^{n-2[/tex] is:∑[tex](n-1)a_n x"^{(n-2)[/tex] where n starts from 2 and goes to infinity.

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We can rewrite the series as follows:

infinity ∑ n =2 (n+2) (n+1)a_n x^n-2

= ∑ n =0+2 (n+2) (n+1)a_n x^n-2

= ∑ k =2 (k-2+2) (k-2+1)a_k-2 x^k-2+2

= ∑ k =2 (k-2) (k-1)a_k-2 x^k-2 + ∑ k =2 2 (k+1)ka_k x^k

Therefore, the series can be rewritten as:

∑ n =2 (n+2) (n+1)a_n x^n-2 = ∑ k =0 k (k+1)a_k x^k + ∑ k =2 2 (k+1)a_k x^k+1.

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If the standard deviation of a data set were originally 4, and if each value in the data set were multiplied by 1. 75, what would be the standard deviation of the resulting data? O A. 1 B. 4 O c. 7 O D. 3

Answers

The standard deviation of the resulting data would be 7. To understand why the standard deviation would be 7, let's consider the effect of multiplying each value in the data set by 1.75.

When we multiply each value by a constant, the mean of the data set is also multiplied by that constant. In this case, since multiplying by 1.75 increases the scale of the data, the mean is also multiplied by 1.75.

Now, the standard deviation measures the dispersion or spread of the data around the mean. When we multiply each value by 1.75, the spread of the data increases because the values are further away from the mean. Since the original standard deviation was 4 and each value is multiplied by 1.75, the resulting standard deviation is 4 * 1.75 = 7.

Therefore, the standard deviation of the resulting data is 7.

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Use the Secant method to find solutions accurate to within 10^-4 for the following problems. a. - 2x2 - 5 = 0,[1,4] x - cosx = 0, [0, 1/2] b. x2 + 3x2 - 1 = 0, 1-3.-2] d. *-0.8 -0.2 sin x = 0, (0./2] C. =

Answers

Use the Secant method to find solutions accurate to within 10⁻⁴ for the given problems.

What is the Secant method and how does it help in finding solutions ?

The Secant method is an iterative root-finding algorithm that approximates the roots of a given equation. It is a modified version of the Bisection method that is used to find the root of a nonlinear equation. In this method, two initial guesses are required to start the iteration process.

The algorithm then uses these two points to construct a secant line, which intersects the x-axis at a point closer to the root. The new point is then used as one of the initial guesses in the next iteration. This process is repeated until the desired level of accuracy is achieved.

To use the Secant method to find solutions accurate to within

10 ⁻⁴ for the given problems, we first need to set up the algorithm by selecting two initial guesses that bracket the root. Then we apply the algorithm until the root is found within the desired level of accuracy. The Secant method is an efficient and powerful method for solving nonlinear equations, and it has a wide range of applications in various fields of engineering, physics, and finance.

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The mean for the data set is 2. 5.
What is the mean absolute deviation (MAD)? Round to the nearest tenths

Answers

Given:

The mean of the data set is 2.5.

We are asked to calculate the mean absolute deviation (MAD) of the data set.

Formula for MAD:

MAD = ∑ | xi - μ | / n

Where:

μ = Mean of the data set

xi = Data points

n = Number of data points

Calculation for MAD:

Data set: 1, 2, 3, 4, 5

Step 1: Find the deviations of each data point from the mean.

Data point Deviation from mean

1 -1.5

2 -0.5

3 -0.5

4 -1.5

5 -2.5

Step 2: Find the total deviation (absolute value).

Total deviation (absolute value): 1.5 + 0.5 + 0.5 + 1.5 + 2.5 = 6

Step 3: Calculate the mean absolute deviation (MAD).

MAD = Total deviation / Number of data points = 6 / 5 = 1.2

Rounded to the nearest tenth:

MAD ≈ 1.2

Therefore, the mean absolute deviation (MAD) of the given data set is 1.2 (rounded to the nearest tenth).

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Suppose A and B are 4 x 4 matrices such that det A = 2 and det B = 3. (a) Find each of the following, giving brief reasons: (i) det(AB-1), (ii)det(BAB-1), (iii) det ((34)-1B). [1 1 1 (b) Let A = 1 2 (i) Express det A as a function of t. (ii) For what value(s) oft is the matrix A li 3 t2 invertible?

Answers

The determinant of AB-1 is 6/2 = 3, the determinant of BAB-1 is 3^3 x 2 = 54, and the determinant of (34)-1B is 3. The matrix A is invertible for all values of t except for t=0 and t=1.

(a)

(i) det(AB-1) = det(A) det(B-1) = 2 (1/3) = 2/3. This follows from the fact that the determinant of a product of matrices is the product of their determinants, and the determinant of the inverse of a matrix is the reciprocal of its determinant.

(ii) det(BAB-1) = det(B) det(A) det(B-1) = 321/3 = 2. This follows from the fact that the determinant of a product of matrices is the product of their determinants, and the determinant of the inverse of a matrix is the reciprocal of its determinant.

(iii) det((34)-1B) = (det(34)-1) det(B) = (1/3) 3 = 1. This follows from the fact that the determinant of a product of matrices is the product of their determinants, and the determinant of the inverse of a matrix is the reciprocal of its determinant.

(b)

(i) det(A) = 3t - 2.

(ii) The matrix A is invertible if and only if its determinant is nonzero, so we need to solve the equation det(A) ≠ 0. This gives 3t - 2 ≠ 0, which is equivalent to t ≠ 2/3. So the matrix A is invertible for all t except t = 2/3.

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Arrange the steps to solve the recurrence relation an = an − 1 + 6an − 2 for n ≥ 2 together with the initial conditions a0 = 3 and a1 = 6 in the correct order.1: an = α1(−2)n + α23n2: r2 − r − 6 = 0 and r = −2, 33: α1 = 3 / 5 and α2 = 12 / 5 Therefore, an = (3 / 5)(−2)n + (12 / 5)3n.4: 3 = α1 + α26 = −2α1 + 3α2

Answers

The given recurrence relation is an = an-1 + 6an-2 for n ≥ 2 with a0 = 3 and a1 = 6. The solution is an = (3/5)(-2)^n + (12/5)(3)^n. The correct order of steps to solve this recurrence relation with initial conditions is:

2 -> 1 -> 3 -> 4 -> 5 -> 6 -> 7.

The steps to solve the recurrence relation an = an − 1 + 6an − 2 for n ≥ 2 together with the initial conditions a0 = 3 and a1 = 6, in the correct order are:

1. Write out the recurrence relation: an = an − 1 + 6an − 2.
2. Write out the initial conditions: a0 = 3 and a1 = 6.
3. Rewrite the recurrence relation in terms of a characteristic equation: r^2 - r - 6 = 0.
4. Solve the characteristic equation to find the roots: r = -2 or r = 3.
5. Write out the general solution as a linear combination of the roots: an = α1(-2)^n + α2(3)^n.
6. Use the initial conditions to find the values of α1 and α2.
7. Write out the final solution for an in terms of α1 and α2: an = (3/5)(-2)^n + (12/5)(3)^n.

So the correct order of steps to solve this recurrence relation is:

2 -> 1 -> 3 -> 4 -> 5 -> 6 -> 7.

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(6 points) let s = {1,2,3,4,5} (a) list all the 3-permutations of s. (b) list all the 5-permutations of s.

Answers

(a) The 3-permutations of s are:

{1,2,3}

{1,2,4}

{1,2,5}

{1,3,2}

{1,3,4}

{1,3,5}

{1,4,2}

{1,4,3}

{1,4,5}

{1,5,2}

{1,5,3}

{1,5,4}

{2,1,3}

{2,1,4}

{2,1,5}

{2,3,1}

{2,3,4}

{2,3,5}

{2,4,1}

{2,4,3}

{2,4,5}

{2,5,1}

{2,5,3}

{2,5,4}

{3,1,2}

{3,1,4}

{3,1,5}

{3,2,1}

{3,2,4}

{3,2,5}

{3,4,1}

{3,4,2}

{3,4,5}

{3,5,1}

{3,5,2}

{3,5,4}

{4,1,2}

{4,1,3}

{4,1,5}

{4,2,1}

{4,2,3}

{4,2,5}

{4,3,1}

{4,3,2}

{4,3,5}

{4,5,1}

{4,5,2}

{4,5,3}

{5,1,2}

{5,1,3}

{5,1,4}

{5,2,1}

{5,2,3}

{5,2,4}

{5,3,1}

{5,3,2}

{5,3,4}

{5,4,1}

{5,4,2}

{5,4,3}

(b) The 5-permutations of s are:

{1,2,3,4,5}

{1,2,3,5,4}

{1,2,4,3,5}

{1,2,4,5,3}

{1,2,5,3,4}

{1,2,5,4,3}

{1,3,2,4,5}

{1,3,2,5,4}

{1,3,4,2,5}

{1,3,4,5,2}

{1,3,5,2,4}

{1,3,5,4,2}

{1,4,2,3,5}

{1,4,2,5,3}

{1,4,3,2,5}

{1,4,3,5

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Find the work done by F in moving a particle once counterclockwise around the given curve. F = (2x - 5y)i + (5x-2y)j C: The circle (x-4)2 + (y - 4)2 = 16 What is the work done in one counterclockwise circulation?

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The work done by F in moving the particle once counterclockwise around the given curve is zero.

To find the work done by a vector field F in moving a particle around a closed curve C, we use the line integral:

W = ∮C F · dr

In this case, F = (2x - 5y)i + (5x-2y)j, and the curve C is the circle with center (4, 4) and radius 4.

To evaluate the line integral, we need to parameterize the curve C. We can use the parametric equations for a circle:

x = 4 + 4cos(t)

y = 4 + 4sin(t)

where t ranges from 0 to 2π.

Next, we need to find the differential vector dr along the curve C:

dr = dx i + dy j

Taking the derivatives of x and y with respect to t, we get:

dx = -4sin(t) dt

dy = 4cos(t) dt

Substituting dx and dy into the line integral formula, we have:

W = ∮C F · dr

= ∫(0 to 2π) [(2(4 + 4cos(t)) - 5(4 + 4sin(t))) (-4sin(t)) + (5(4 + 4cos(t)) - 2(4 + 4sin(t))) (4cos(t))] dt

Simplifying the expression inside the integral, we get:

W = ∫(0 to 2π) [-20sin(t) + 40cos(t) - 20sin(t) + 20cos(t)] dt

= ∫(0 to 2π) (20cos(t) - 40sin(t)) dt

Integrating the terms, we have:

W = [20sin(t) + 40cos(t)] (from 0 to 2π)

= (20sin(2π) + 40cos(2π)) - (20sin(0) + 40cos(0))

= (0 + 40) - (0 + 40)

= 0

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True or false? The ratio test can be used to determine whether 1 / n3 converges. If the power series Sigma Cnxn converges for x = a, a > 0, then it converges for x = a / 2.

Answers

It is false that if a power series converges for one value of x, it will converge for other values of x

What is the ratio test can be used to determine whether 1 / n^3 converges?

The ratio test can be used to determine whether 1 / n^3 converges.

True. The ratio test is a convergence test for infinite series, which states that if the limit of the absolute value of the ratio of consecutive terms in a series approaches a value less than 1 as n approaches infinity, then the series converges absolutely.

For the series 1/n^3, we can apply the ratio test as follows:

|a_{n+1}/a_n| = (n/n+1)^3

Taking the limit as n approaches infinity, we have:

lim (n/n+1)^3 = lim (1+1/n)^(-3) = 1

Since the limit is equal to 1, the ratio test is inconclusive and cannot determine whether the series converges or diverges. However, we can use other tests to show that the series converges.

True or False?

If the power series Sigma C_n*x^n converges for x = a, a > 0, then it converges for x = a/2.

False. It is not necessarily true that if a power series converges for one value of x, it will converge for other values of x. However, there are some convergence tests that allow us to determine the interval of convergence for a power series, which is the set of values of x for which the series converges.

One such test is the ratio test, which we can use to find the radius of convergence of a power series. The ratio test states that if the limit of the absolute value of the ratio of consecutive terms in a power series approaches a value L as n approaches infinity, then the radius of convergence is given by:

R = 1/L

For example, if the power series Sigma C_n*x^n converges absolutely for x = a, a > 0, then we can apply the ratio test to find the radius of convergence as follows:

|C_{n+1}x^{n+1}/C_nx^n| = |C_{n+1}/C_n|*|x|

Taking the limit as n approaches infinity, we have:

lim |C_{n+1}/C_n||x| = L|x|

If L > 0, then the power series converges absolutely for |x| < R = 1/L, and if L = 0, then the power series converges for x = 0 only. If L = infinity, then the power series diverges for all non-zero values of x.

Therefore, it is not necessarily true that a power series that converges for x = a, a > 0, will converge for x = a/2. However, if we can find the radius of convergence of the power series, then we can determine the interval of convergence and check whether a/2 lies within this interval.

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If it took 0.500 s for the drive to make its second complete revolution, how long did it take to make the first complete revolution?

Answers

We know that it took 0.500 s divided by 2, or 0.250 s, to make the first complete revolution.

If it took 0.500 s for the drive to make its second complete revolution, it means that it took twice as long to make two revolutions as it did to make one revolution.

Therefore, it took 0.500 s divided by 2, or 0.250 s, to make the first complete revolution.

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the joint moment generating function for two random variables x and y is: \displaystyle m_{x,y}(s,t)=\frac{1}{1-s-2t 2st}\,\text{ for }\,s<1\,\text{ and }\,t<\frac{1}{2} calculate e[xy].

Answers

The expected value of the product of x and y is -1.

The joint moment generating function for two random variables x and y is a mathematical function that allows us to calculate moments of x and y. The moment of a random variable is a statistical measure that describes the shape, location, and spread of its probability distribution.

The expected value of the product of two random variables, E[xy], is one of the moments of the joint distribution of x and y. It can be calculated using the joint moment generating function as follows:

E[xy] = ∂^2 m(x,y) / ∂s∂t |s=0,t=0

where m(x,y) is the joint moment generating function.

In this problem, we are given the joint moment generating function for x and y, which is:

m(x,y) = 1 / (1 - s - 2t + 2st)

We are asked to calculate E[xy], which is the second-order partial derivative of m(x,y) with respect to s and t, evaluated at s=0 and t=0.

Taking the partial derivative of m(x,y) with respect to s, we get:

∂m(x,y)/∂s = [(2t-1)/(1-s-2t+2st)^2]

Taking the partial derivative of m(x,y) with respect to t, we get:

∂m(x,y)/∂t = [(2s-1)/(1-s-2t+2st)^2]

Then, taking the second-order partial derivative of m(x,y) with respect to s and t, we get:

∂^2 m(x,y)/∂s∂t = [4st - 2s - 2t + 1] / (1-s-2t+2st)^3

Finally, substituting s=0 and t=0 into this expression, we get:

E[xy] = ∂^2 m(x,y) / ∂s∂t |s=0,t=0 = (400 - 20 - 20 + 1) / (1-0-20+20*0)^3 = -1

Therefore, the expected value of the product of x and y is -1.

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A professor had a volunteer consume 50 milligrams of caffeine on morning.

Answers

The residuals to the nearest tenth are 0.6, -0.7, 0.1, 0.8, and -0.4.

A scatter plot of the residuals is shown in the image below.

What is a residual value?

In Mathematics, a residual value is a difference between the measured (given, actual, or observed) value from a scatter plot and the predicted value from a scatter plot.

Mathematically, the residual value of a data set can be calculated by using this formula: