7. Serena bought a scarf for $16.99 and was charged 7.5% tax on her purchase. Which of the
following was the amount of sales tax that Serena had to pay?
(1) $1.19
(3) $1.36
(2) $1.27
(4) $1.51

Answer:

Make the expressions equal to each other.

2x + 7 = -3x + 17

Use subtraction, division, and addition to isolate the variable.

2x + 3x + 7 = -3x + 3x + 17

5x + 7 = 17

5x + 7 - 7 = 17 - 7

5x = 10

5x/5 = 10/5

x = 2

y = 11

Step-by-step explanation:

Answer:

[tex]A) 81x^{-12}y^{20}[/tex]

B) 5

Step-by-step explanation:

[tex]A) (3x^{-3}y^5)^4=(3)^4 \,\cdot\, (x^{-3})^4\,\cdot\,(y^5)^4=81x^{-12}y^{20}\\\\B) 5x^0=5(1)=5[/tex]

Here is the frequency table for the data, using bins of 20-29, 30-39, and so on:

Age

A table that is created to display the distribution of a characteristic's frequency of occurrence in accordance with a specific set of class intervals.

With the ages and data sets given, we are able to compute the frequency of occurrence in the data set using the specific class interval given.

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The rate of the current is 10 mi/hr and the total distance traveled is 100 mi.

Let S be the speed of the current, R be the speed of the boat in still water, t1 be the time taken to row upstream and t2 be the time taken to row downstream. The total distance traveled is given by the formula [tex]d = R(t1 + t2)[/tex]. In this case, [tex]d = 5(15 + 10) = 100 mi[/tex].

To calculate the rate of the current, we can use the formula[tex]d = (R + S)t1 = (R - S)t2[/tex]. In this case, 100[tex]= (5 + S)15 = (5 - S)10[/tex], which can be simplified to [tex]S = (100 - 50)/5 = 10 mi/hr[/tex].

Therefore, the rate of the current is 10 mi/hr and the total distance traveled is 100 mi.

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Answer:

The proportion of the width to the length of the original photograph is 4:6, which can be simplified to 2:3. To maintain the same proportion, the width of the reduced photograph must also be 2/3 of the length.

Since the length of the space in the brochure is 4 inches, the width of the space must be:

width = (2/3) x length

width = (2/3) x 4

width = 8/3

width ≈ 2.67 inches

Therefore, the width of the space in the brochure should be approximately 2.67 inches to maintain the proportion of the photograph.

The problem of scheduling exams for the high school students can be solved by using graph theory. We can represent the overlap of students in the form of a graph where each teacher is a node and the edges represent the students who belong to both the teachers classes.

To ensure that no student has to take more than one exam each day, we need to find a coloring of the graph such that no two adjacent nodes have the same color. This is equivalent to scheduling exams such that no two exams on the same day have any common students.

Using a greedy approach, we may overcome this issue by starting with any node and assigning it a color.. We then recursively color the neighbors of the node with a different color and so on. This algorithm will always produce a valid coloring since we are guaranteed to find a valid color for every node, given that we have not run out of colors.

In this case, we have seven teachers so we need at least seven colors. However we can find a valid coloring with fewer colors, depending on the structure of the graph. This problem can also be extended to more general situations, where we have more than one exam per day or where we have more complex constraints on the scheduling of exams.

The answer is general as no additional data is given.

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Overdraft protection and lines of credit are two financial tools that can be used to cover unexpected expenses or short-term financing needs.  Some of their costs and benefits are shown below.

Overdraft protection is a service offered by banks to protect their customers from overdraft fees. If a customer tries to withdraw more money than is available in their account, the bank will cover the transaction and charge a fee.

The cost of overdraft protection is usually a fee charged by the bank for each overdraft transaction, which can add up over time. The benefit of overdraft protection is that it can help customers avoid overdraft fees and the embarrassment of declined transactions.

Lines of credit are a type of loan that allows borrowers to access funds up to a certain limit. They are typically unsecured, meaning that they do not require collateral, and are often used for short-term financing needs such as home improvements, car repairs, or unexpected expenses.

The cost of a line of credit is usually an interest rate on the amount borrowed. The benefit of a line of credit is that it provides access to funds when they are needed, without having to apply for a loan each time.

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The relation that is a function is D (see image below).

If any vertical line passes through more than one point on a graph, then the relation is not a function. Conversely, if every vertical line intersects the graph at most one point, then the relation is a function.

Applying the vertical line test, if we place a vertical line across each graph given, only the graph in option D (as shown in the image below) will have the the vertical line intersects it at most one point.

Therefore, the correct option is D. (see image below).

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The cumulative distribution function of t, the number of years to maturity for a randomly selected bond is a. 1/4, b. 3/4, c. 1/2, d. 1/3.

The probability of a randomly selected bond maturing exactly after 5 years is 1/4. The probability of a randomly selected bond maturing after more than 3 years is 3/4. The probability of a randomly selected bond maturing between 1.4 and 6 years is 1/2.

a) P(T=5) = F(5) - F(4) = 3/4 - 1/2 = 1/4

b) P(T>3) = 1 - P(T≤3) = 1 - F(3) = 1 - 1/4 = 3/4

c) P(1.4 < T < 6) = F(6) - F(1.4) = 3/4 - 1/4 = 1/2

d) P(T≤5 | T≥2) = P(2 ≤ T ≤ 5) / P(T≥2) = (F(5) - F(2)) / (1 - F(2)) = (3/4 - 1/4) / (1 - 1/4) = 1/3

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The question is -

An investment firm offers its customers municipal bonds that mature after varying numbers of years. Given that the cumulative distribution function of t, the number of years to maturity for a randomly selected bond is:

f ( x ) = ⎧  0        t < 1

           ⎪ 1 / 4     1 ≤ t < 3

           ⎪ 1 / 2     3 ≤ t < 5

           ⎨ 3 / 4    5 ≤ t < 7

           ⎩  1           t ≥ 7

Find: a) P(T = 5) b) P(T > 3) c) P(1.4 < T < 6) d) P(T ≤ 5 | T ≥ 2)

120 ounce of strawberry, 80 ounce of blueberry, 80 ounce of lime juice, 120 ounce of simple syrup and 240 ounce of sugar is needed to make five gallons (640 ounces) of fruit punch

An equation is an expression that shows how numbers and variables are linked together using mathematical operations such as addition, subtraction, multiplication and division.

1 gal = 128 oz. Hence:

5 gal = 5 gal * 128 oz. per gal = 640 ounces

If a fruit punch is made using 3 parts strawberries, 2 parts blueberry, 2 parts lime juice, 3 parts simple syrup, and 6 parts sugar. Hence. of 5 gallons:

Amount of strawberry = [3/(3 + 2 + 2 + 3 + 6)] * 640 ounces = (3/16) * 640 = 120 ounces

Amount of blueberry = [2/(3 + 2 + 2 + 3 + 6)] * 640 ounces = (2/16) * 640 = 80 ounces

Amount of lime juice = [2/(3 + 2 + 2 + 3 + 6)] * 640 ounces = (2/16) * 640 = 80 ounces

Amount of simple syrup = [3/(3 + 2 + 2 + 3 + 6)] * 640 ounces = (3/16) * 640 = 120 ounces

Amount of sugar = [6/(3 + 2 + 2 + 3 + 6)] * 640 ounces = (6/16) * 640 = 240 ounces

120 ounce of strawberry, 80 ounce of blueberry, 80 ounce of lime juice, 120 ounce of simple syrup and 240 ounce of sugar is needed

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The cross-section of the cylinders and cones is always round.

The cross-sectional area is the region of a two-dimensional shape produced when a three-dimensional object, such as a cylinder, is cut perpendicular to a preset axis at a point.

A cylinder is one of the most basic curvilinear geometric shapes and has traditionally been solid in three dimensions. In elementary geometry, it is regarded as a prism with a circle as its basis.

A three-dimensional geometric shape known as a cone has a flat base and a smooth, tapering vertex. A cone is made up of several line segments, half-lines, or lines that connect to a single point.

As a result, the cross sections of the cones and cylinders are always round.

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An equation relating x and y but without t and square roots is represented by x² + y² = 16, here variable terms are present on one side and any constant on the other side.

A function is represented in the cartesian form, such as, f(x,y)=0 or expressed in the form of parametric equations, written as

r(t) = ⟨x(t),y(t)⟩, α ≤ t ≤ β

the position vector, x(t) and y(t) helps to determine the location of a particular point on the curve with respect to a third independent parameter or varible t. We have, a curve C with parametrized equation, x = t and y = √(6-t²) for -4≤ t ≤ 4. We have to write eqution related to x and y without t and square roots. So,

substitute t = x in y

=> y = √(16 − x²)

squaring on both sides

=> y² = (16 - x²)

=> x² + y² = 16

Hence, the required equation is x² + y² = 16.

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Answer:

1/ $12 for each ticket

2/ $84 for 7 tickets

Step-by-step explanation:

We know

Layla paid $48 for 4 movie tickets

How much does each ticket cost?

48 / 4 = $12 for each ticket

So, each ticket cost $12

How much would it cost her to purchase 7 tickets?

12 x 7 = $84

So, it cost her $84 to purchase 7 tickets.

In slope-intercept form, the equation of the line is y = (5/4)x + 6 1/2.

An equation in mathematics is a statement that two expressions are equal. An equation can be written in the form of a mathematical expression on the left side equal to a value or another mathematical expression on the right side. There are different types of equations, including linear equations, quadratic equations, and exponential equations, among others. Equations can be solved for a specific variable, and the solution is the value of the variable that makes the equation true. The process of solving an equation involves isolating the variable on one side of the equation and finding its value.

Here,

The slope-intercept form of a line is given by y = mx + b, where m is the slope of the line and b is the y-intercept, which is the point at which the line intersects the y-axis. To find the equation of a line in slope-intercept form given its slope and a point on the line, we can use the following steps:

Use the point-slope form of a line: y - y1 = m(x - x1), where (x1, y1) is a point on the line and m is the slope.

Plug in the slope and the point: y - 6 = (5/4)(x + 4).

Solve for y: y = (5/4)x + (26/4).

Simplify the equation: y = (5/4)x + 6 1/2.

So, the equation of the line in slope-intercept form is y = (5/4)x + 6 1/2.

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State: 99% CI for the true difference in proportions where p1 = the proportion of all U.S. men who can identify India on the map and p2 = the proportion of all US women who can identify India on the map. The main answer is (-0.216, 0.056).

The 95% confidence interval for the true difference in the proportion of U.S. men and women who can identify India on a map is (-0.206, 0.066). This means that we are 95% confident that the true difference in proportions lies between -0.206 and 0.066.

To construct this confidence interval, we use the formula:

CI = (p1 - p2) ± z*SE

where p1 and p2 are the sample proportions for men and women respectively, z is the critical value for a 95% confidence level (1.96), and SE is the standard error of the difference in proportions.

The sample proportion for men is 27/90 = 0.3, and for women it is 38/100 = 0.38. Therefore, p1 - p2 = -0.08. The standard error is:

SE = sqrt(p1*(1-p1)/n1 + p2*(1-p2)/n2) = sqrt(0.30.7/90 + 0.380.62/100) = 0.084

Substituting these values into the formula, we get:

CI = (-0.08) ± 1.96*0.084 = (-0.206, 0.066)

Thus, we can say with 95% confidence that the true difference in proportions of U.S. men and women who can identify India on a map lies between -0.206 and 0.066. This means that there may not be a significant difference between the two proportions.

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The person is 36m away from the boat.

The given figure is triangular in nature. In order to determine the distance of the person from the boat, we will use the pythagoras theorem.

Given the following parameters

GH = 20m

GK = 30m

The measure of the length HK (The distance of the person from the boat,) is calculated as:

HK^2 = GH^2 + GK^2

HK^2 = 20^2+ 30^2

HK^2 = 400+900
HK^2 = 1300

HK = 36m

Hence the distance of the person from the boat is approximately 36m

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To calculate the average speed of the lap record, we need to know the distance covered and the time taken.

Distance = 5.303 km

Time = 1 minute and 24 seconds = 84 seconds

To convert seconds to hours, we divide by 3600 (the number of seconds in an hour):

[tex] \frac{84 \: seconds \:}{3600} = 0.02333 \: hours[/tex]

Now we can calculate the average speed:

[tex]Average \: speed = \frac{d}{t} = \frac{5.303km}{0.02333} [/tex]

Average speed = 227.59 km/h

The probability of finding exactly 6 defects in a carpet roll  is 0.0435 and the probability of finding 2 or fewer defects in a carpet roll is 0.405.

a. To find the probability of finding exactly 6 defects in a carpet roll chosen at random, we can use the Poisson formula:

P(X = 6) = (e^-λ  * λ ^6) / 6!

putting λ = 2.0, we get:

P(X = 6) = (e^-2 * 2^6) / 6! = 0.0435

So the probability of  6 defects in a carpet roll chosen at random is 0.0435.

b. To find the probability of finding 2 or fewer defects in a carpet roll, we can use the cumulative distribution function of the Poisson distribution:

P(X <= 2) = 1 - P(X > 2)

Using the Poisson formula, we can calculate P(X > 2) as follows:

P(X > 2) = 1 - (P(X = 0) + P(X = 1) + P(X = 2))

Plugging in λ   = 2.0, we get:

P(X > 2) = 1 - (0.135 + 0.27 + 0.54) = 0.595

So P(X <= 2) = 1 - 0.595 = 0.405

So the probability of finding 2 or fewer defects in a carpet roll is 0.405.

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___The given question is incorrect, the correct question is given below:

The Turkalike Rug Company buys medium grade carpet in 100-foot rolls. The average number of defects per roll is 2.0. Assuming that these data follow a Poisson distribution, use the Poisson spreadsheet template to answer the following questions.

a) What is the probability of finding exactly 6 defects in a carpet roll chosen at random?

b) What is the probability of finding 2 or fewer defects in a carpet roll?

The Cosine of angle S in the given triangle is

[tex]\frac{8}{10} =\frac{4}{5}[/tex] .

Trigonometric Identities are equality claims that apply the principles of trigonometry and are valid for all possible values of the variables in the equation.

Many particular trigonometric identities can be used to express the relationship between a triangle's side length and angle.Only the right-angle triangle is consistent with the trigonometric identities.

All trigonometric identities are built upon the foundation of the six trigonometric ratios. Some of their names are sine, cosine, tangent, cosecant, secant, and cotangent. Each of these trigonometric ratios is defined using the adjacent side, opposite side, and hypotenuse side of the right triangle. All fundamental trigonometric identities are derived from the six trigonometric ratios.

The Cosine of an angle ∅ in a right triangle is given as ,

Cosine (∅) = [tex]\frac{base}{hypotenuse}[/tex]

Now in the given triangle .

[tex]Cosine (S)=\frac{8}{10} =\frac{4}{5}[/tex]

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The value of k is given as follows:

k = 24.

To find the numeric value of a function or of an expression, we replace each instance of the variable in the function or in the expression by the value at which we want to find the numeric value.

From the table, we have that when x = 6, y = k, hence the value of k is found replacing each of the three instances of x by 6, as follows:

k = (6 - 3)(6 - 5)(6 + 2)

k = 3 x 1 x 8

k = 24.

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Answer:

11.85  (3)

Step-by-step explanation:

The correct equation that represents this situation is:

3.90 + a = 15.75

where "a" represents the amount that Andreas spent on art supplies.

To solve for "a", we can subtract 3.90 from both sides:

a = 15.75 - 3.90

a = 11.85

Therefore, Andreas spent $11.85 on art supplies.

Answer: OD. T = 2875 + 2,022n

Step-by-step explanation: What makes the most sense is

OD. T = 2875 + 2,022n

because they added 2875 to the trees already there and 4,897 was the new total after four months, I also want to point out it has nothing to do with decimals or a 700 number.

The probability that the system can decode the correct message is approximately 0.9477.

The random variable N denotes the number of error-free transmissions for a single meter upon receiving the wake-up call.

Since each transmission is error-free with probability p=0.9 and the transmissions are independent, the number of error-free transmissions follows a binomial distribution with parameters n=4 (number of trials) and p=0.9 (probability of success in each trial).

The probability mass function (PMF) of N is given by:

P(N=k) = (4 choose k) × [tex]0.9^k[/tex] × [tex]0.1^{(4-k)}[/tex], for k = 0, 1, 2, 3, 4

where (4 choose k) is the binomial coefficient, which represents the number of ways to choose k successes out of 4 trials.

The error correction scheme can decode the correct message if at least 3 out of 4 transmissions are error-free. Let X be the number of error-free transmissions for a single meter.

Then the probability that the system can decode the correct message is:

P(X >= 3) = P(X = 3) + P(X = 4)

To find these probabilities, we use the PMF of N from part 1:

P(X = 3) = P(N = 3) + P(N = 4) = (4 choose 3) × [tex]0.9^3[/tex] × 0.1 + (4 choose 4) × [tex]0.9^4[/tex] × [tex]0.1^0[/tex] = 0.2916

P(X = 4) = P(N = 4) = (4 choose 4) × [tex]0.9^4[/tex] × [tex]0.1^0[/tex] = 0.6561

Therefore, the probability that the system can decode the correct message is:

P(X >= 3) = P(X = 3) + P(X = 4) = 0.2916 + 0.6561 = 0.9477.

So the probability that the system can decode the correct message is approximately 0.9477.

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Answer:

Below

Step-by-step explanation:

25 oo pass / hr

# passengers for H hours  would be   2500H

    f (H) = 2500 H

Answer:

a) 2500H

b) 20,000

Step-by-step explanation:

To find the number of passengers carried, multiply the number of passengers carried in an hour by the total hours.

  a)    Passengers carried in an hour = 2500

     Passengers carried in 'H' hours = 2500 * H = 2500H

b)  H = 8 hours

  Passengers carried in 8 hours = 2500 * 8

                                                      = 20,000

Answer:

Step-by-step explanation:

The number 10111.011 in base 2 is already in binary, so no conversion is necessary.

The lateral area of the triangular prism is  3 cm².

The surface area of the triangular prism is 4 cm².

The diagram above is a triangular prism. The lateral area can be found as follows:

lateral area of the triangular prism = perimeter of the base × height

Therefore,

lateral area of the triangular prism = (1 + 1 + 1) × 1

lateral area of the triangular prism = 3 × 1

lateral area of the triangular prism = 3 cm²

Therefore,

surface area of the triangular prism = perimeter of the base × height + 2(base area)

Therefore,

surface area of the triangular prism =  3 + (1 × 1)

surface area of the triangular prism = 4 cm²

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The distance between each of the 9 tables is given as follows:

625 meters.

The distance is obtained applying the proportions in the context of the problem.

A proportion is applied as the distance is calculated by the division of the total distance by the number of spaces, which is one less than the number of tables.

The parameters for this problem are given as follows:

Hence the distance between each of the 9 tables is obtained as follows:

5000/8 = 625 meters.

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It is not possible to give an exact answer to this question without knowing the specific function s. However, in general, the slope of the tangent line to a function s at a specific point t can be found by taking the derivative of the function s at that point.

If we let f(t) be the function s, then the derivative of f(t) at t=1 would give us the slope of the tangent line to s at that point. This can be written mathematically as:

s'(1) = lim(h->0) [s(1+h) - s(1)]/h

Here, s'(1) represents the derivative of s at t=1, and h represents a small change in t. By taking the limit as h approaches 0, we can find the instantaneous rate of change of s at t=1, which is the slope of the tangent line to s at that point.

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Answer:b or 2 option

Step-by-step explanation= $16x3=48 and $8x8=64 adding those together equals $112 and that is what answer b says i would really apreaciate branliest.

The 99% confidence interval estimate of the mean of the brain volume of the population is given as follows:

(1009.5, 1250.9).

The t-distribution is used when the standard deviation for the population is not known, and the bounds of the confidence interval are given according to the following rule:

[tex]\overline{x} \pm t\frac{s}{\sqrt{n}}[/tex]

In which the variables of the equation are presented as follows:

The critical value, using a t-distribution calculator, for a two-tailed 99% confidence interval, with 10 - 1 = 9 df, is t = 3.2498.

Using a calculator, the parameters are given as follows:

[tex]\overline{x} = 1130.2, s = 117.45, n = 10[/tex]

The lower bound of the interval is of:

1130.2 - 3.2498 x 117.45/sqrt(10) = 1009.5.

The upper bound of the interval is of:

1130.2 + 3.2498 x 117.45/sqrt(10) = 1250.9.

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