Help plssssssssssssss?

Answer: 64

Step-by-step explanation:

(47 + 39) - 22

= 86 - 22

= 64

A 99% confidence interval for an IQ test conducted for a sample of 101 sixth graders, where the sample mean was 104.2, with a standard deviation of 12 is 104.2 ± 3.076.

A 99% confidence interval can be calculated using the formula:

sample mean ± (critical value) x (standard deviation of the mean/ √(sample size))

[tex]sample\ mean\± (critical\ value) ( \frac{standard\ deviation\ of\ the\ mean}{\sqrt{sample\ size} } )[/tex]

To find the critical value, we can use the standard normal distribution table. For a 99% confidence interval, the critical value for a two-tailed test is approximately 2.576.

So, for this problem where sample mean = 104.2 and standard deviation of mean = 12, the 99% confidence interval would be:

104.2 ± 2.576 x (12 / √101)

≈ 104.2 ± 3.076

The standard deviation of the mean is the standard deviation of the sample divided by the square root of the sample size.

This gives us a range of approximately (101.124, 107.276). So we can say that there is a 99% probability that the true population mean IQ score of sixth graders is between 101.122 and 107.276.

To know more on confidence interval

https://brainly.com/question/24131141

#SPJ4

The second set of coordinates is known as the Polar Coordinates.

Polar coordinates are a two-dimensional coordinate system in which each point on a plane is determined by a distance from a reference point (the pole) and an angle from a reference direction (the polar axis). The reference point is usually the origin (0,0) of a Cartesian coordinate system, and the reference direction is usually the positive x-axis of the Cartesian coordinate system. Polar coordinates are useful when dealing with circular shapes and symmetric patterns because all points on a circle can be represented by a single polar coordinate. For example, if you want to draw a circle, you only need to specify the center point, the radius, and the number of degrees you want to cover. Polar coordinates also allow for an easy conversion to Cartesian coordinates, which can be used for plotting points and finding distances. Additionally, polar coordinates can be used to determine angles and distances between two points in a two-dimensional plane. Polar coordinates are a powerful tool in mathematics and engineering, allowing for more efficient analysis of shapes and patterns.

Learn more about Polar Coordinates here:

https://brainly.com/question/11657509

#SPJ4

There is a significant association if is between 0.85 and 1. There is a moderate connection if lies between 0.5 and 0.85. If, then there is a weak association between the two variables.

The strength of the linear link between two separate variables, x and y, is shown by correlation coefficients.

A positive relationship is shown by a linear correlation coefficient greater than zero.

Indicating a negative association is a value less than zero. The two variables x and y do not have any relationship when their values are 0, to sum up.

The correlation coefficient (r2) is a statistic that expresses how closely two variables' movements are related to one another.

To determine the linear relationship between two variables, the Pearson product-moment correlation, the most popular correlation coefficient, is used.

However, this correlation value might not necessarily be a reliable indicator of reliance in a non-linear connection.

Hence, There is a significant association if is between 0.85 and 1. There is a moderate connection if lies between 0.5 and 0.85. If, then there is a weak association between the two variables.

learn more about Correlation Coefficient click here:

brainly.com/question/4219149

#SPJ4

The equations can be completed by;

1)  y^8 - 1/y^8

2) 1/y^8 + 1/y^2

We have to know that there are laws that can be used when we are dealing with exponents. Two of the laws that we need to know here are the law of multiplication and the law of division.

Note that;

a^m/a^n = a^m - n (division law)

a^m * a^n = a^ m + n (multiplication law)

Having these laws at the back of our minds;

y^5 y^3 - (y^-2)^4 = y^8 - y^-8

= y^8 - 1/y^8

And;

(y^-2)^4 + y^3/y^5

y^-8 + y^-2

1/y^8 + 1/y^2

Learn more about exponents law:https://brainly.com/question/28966438

#SPJ1

This figure has Line, Point and Rotational Symmetry.

If a figure can be rotated by an angle between 0° and 360° so that the image coincides with the preimage, it has rotational symmetry. The smallest angle for which the figure can be rotated to coincide with itself is the angle of rotational symmetry.

A line of symmetry is a line that divides two equal and symmetrical parts of a shape or object. This line is also known as the axis of symmetry or the mirror line because it divides the figure symmetrically and the divided parts appear to be mirror reflections of each other.

To know more about line visit:-

brainly.com/question/17731558

#SPJ1

The simplified form of the expression √-25 - 4 is 5i - 4.

Given the expression in the question.

√-25 - 4

To simplify, rewrite -25 as -1(25)

√-1(25) - 4

Rewrite √-1(25)  as √-1 × √25

√-1 × √25  - 4

Rewrite √-1 as i

i × √25  - 4

Rewrite 25 as 5²

i × √5²  - 4

Now, pull terms out from under the radical, assuming positive real numbers.

i × 5  - 4

Multiply i and 5

5i - 4

Therefore, the simplified form is  5i - 4.

Option C) 5i - 4 is the correct answer.

Learn more about complex numbers here: https://brainly.com/question/20566728

#SPJ1

To make the given expression x² + 4x + ___ a perfect square ( x + 2)² we must add 4 to the given expression.

As given in the question,

Given expression is equal to :

x² + 4x + ___

Using the formula of perfect square we have :

( a + b )² = a² + 2ab + b²

Here in the given expression x² + 4x + ___

a = x

b = 2

This implies that :

x² + 4x + ___

= x² + 2 ( 2 ) ( x ) + ( 2 )²

= x² + 2 ( 2 ) ( x ) + 4

= ( x + 2 )²

We must add '4' to the given expression.

Therefore, '4' must be added to the given expression x² + 4x + ___ to make it perfect square ( x + 2 )².

The above question is incomplete , the complete question is :

What must be added to the given expression x² + 4x + ___  to make it perfect square ?

Learn more about expression here

brainly.com/question/14083225

#SPJ4

Answer: If Caleb bought 5/4 of the 12 grams of tea for his mom, we can use the following equation to find out how many grams he got his mom:

5/4 * 12 grams = (5/4) * 12 = 15 grams

So Caleb bought 15 grams of tea for his mom

Step-by-step explanation:

When adopting the unitary technique, a mile is equivalent to 1.8 miles per hour when it takes 3/5 miles and 1/3 hour.

The unit technique is a method of problem-solving where you first calculate the value of a single unit, then multiply that value to get the answer. Simply expressed, a single unit value is extracted from a specified multiple using the unit method. For instance, 40 pens will set you back 400 rupees, or $1.01. The method used to accomplish this might be standardized. a solitary nation. anything has a distinctive component. (Mathematics, Algebra) Its adjoint and reciprocal are equivalent. (Linear Algebra, Mathematical Analysis, Mathematics of Matrix or Operators)

given

3/5 miles were traveled in one third of an hour.

The distance that can be traveled in 1 hour is equal to (3/5) (1/3)

= (3/5)×3= 1.8 mph

Here, unit rate is expressed as mph=1.8 mph.

When adopting the unitary technique, a mile is equivalent to 1.8 miles per hour when it takes 3/5 miles and 1/3 hour.

To know more about unitary method  visit:

https://brainly.com/question/28276953

#SPJ1

If the model train is 57 cm long, then 266 m is the length of real train.

In the given question, a model train has a scale of 3 cm : 14 m.

If the model train is 57 cm long, then we have to find how long the real train is.

The scale of model train is 3 cm :  14 m.

Now firstly convert m in cm. As we know that 1 m = 100 cm

Now, the scale of model train is 3 cm :  1400 cm.

The length of the model train is 57 cm.

So in the scale of the model train 3 cm = 57 cm

Now the scale of the model train 1 cm = 19 cm

Now find the length of the real train by multiplying the 1400  by 19 because in the scale of 1 cm is equal to the 19 cm.

So, the length of the real train = 1400 × 19

The length of the real train = 26600 cm

The length of the real train = 266 m

To learn more about ratio link is here

brainly.com/question/24711588

#SPJ4

Answer:

59040

Step-by-step explanation:

Answer:

Step-by-step explanation:

ygyggygy

The equation -3(4x - 8) = 6x + 12 has infinitely many solutions.

An equation has infinitely many solutions when the equation is true for all possible values of the variable. One way to identify that an equation has infinitely many solutions is to see if the equation is true when the variable is replaced by any value.

A system of equations is a set of two or more equations that involve the same variables. The goal is to find the values of the variables that satisfy all of the equations in the system. There are different methods to solve a system of equations, depending on the type of equations and the number of variables involved.

The equation that has infinitely many solutions is:

B. -3(4x - 8) = 6x + 12

To see this, we can simplify the equation to:

-12x + 24 = 6x + 12

-12x = 12

x = -1

Now, if we put x = -1 in the equation, we see that it is true. If we put x = -2, x=0, x = 1, x = 3 and so on, we can see that the equation is true for all values of x.

To know more about system of  equation visit:

https://brainly.com/question/12895249

#SPJ1

Answer: 42 minutes

Step-by-step explanation:

To find 7/10 of an hour, you can multiply 7/10 by 60 (the number of minutes in an hour) to get 420/10 minutes which simplifies to 42.

So, on solving the question the inequality equation, that will be formed here is  3x3+2y>1 and 4xx-y< -3

If not, shade the other side of the plane. Graph each of the system's inequalities similarly. The place where all of the system's solutions intersect is where the system of inequalities' solution is located.

One solution pair exists for each independent system (x,y). There is just one possible location: the intersection of the two lines. There is no way to fix an inconsistent system. The two lines are parallel and will never cross one another, as you can see. There are countless ways to solve a dependent system.

If the inequality is true when the values of x and y are substituted, then an ordered pair (x,y) is the solution to the linear inequality. As a result, if the absolute value expression is set to a negative number, there is no solution.

the inequality equation, that will be formed here is

3x3+2y>1

and 4xx-y< -3

To know more about inequality refer to:

brainly.com/question/6979468

#SPJ1

17 ≥ 6x is the inequality which can be represented for the given variable x.

If not, shade the other side of the plane. Graph each of the system's inequalities similarly. The place where all of the system's solutions intersect is where the system of inequalities' solution is located.

One solution pair exists for each independent system (x, y). There is just one possible location: the intersection of the two lines. There is no way to fix an inconsistent system. The two lines are parallel and will never cross one another, as you can see. There are countless ways to solve a dependent system.

If the inequality is true when the values of x and y are substituted, then an ordered pair (x,y) is the solution to the linear inequality. As a result, if the absolute value expression is set to a negative number, there is no solution.

You must pay $8.50 or less for the copies and each copy is $0.30

Let the number of copies be x and we have the inequality,

8.50 ≥ 0.30x

Divide 5 and multiply 10 from both sides

17 ≥ 6x

Thus, 17 ≥ 6x is the inequality which can be represented for the given variable x.

To know more about inequality refer to:

brainly.com/question/6979468

#SPJ1

The slope of the line through the points is -5/7.

What is slope ?

A number that describes a line's direction and steepness is known as the slope or gradient of a line in mathematics.

A line's steepness is determined by its slope. In mathematics, slope is determined by "rise over run" (change in y divided by change in x).

The slope is calculated as the ratio of the rise, which is the vertical change between two points, to the run, which is the horizontal change between those same two sites.

Typically, a line's slope provides information about the steepness and direction of the line. Finding the difference between the coordinates of the locations will allow you to quickly compute the slope of a straight line connecting two points, (x1,y1) and (x2,y2).

m=Δy/Δx

m=(y2−y1)/(x2−x1)

m=(4−−1)/(−3−4)

m=5/−7

m=−5/7

To learn more about slope the given link  

https://brainly.com/question/3493733

#SPJ1

The new velocity of the object is -4.04 m/s

Impulse is the change in momentum of an object which a force causes. It is  equal to the magnitude of the force multiplied by the length of time the force is applied.

Mathematically:

Impulse (I) = change in momentum = force(F) × time (t)

Also,

Ft = m(v-u)

I = m(v-u)

where m is the mass of the object, v is the new velocity and u is the initial velocity

From the given information; m = 148kg, u = -3.5m/s, I = -80 kg m/s:

I = m(v-u)

-80 = 148(v - (-3.5))

-80 = 148(v +3.5)

-80 = 148v + 518

148v = -80-518

148v = -598

v = -598/148

v = -4.04 m/s

Learn more about impulse on:

brainly.com/question/904448

#SPJ1

The function for the given compound interest will be A = 3000(1+6/4)  and A = 5000(1+7.2)  .

What is compound interest?

The interest on savings that is computed on both the initial principal and the interest accrued over time is known as compound interest. Compound interest is computed by multiplying the starting principal amount by one and the annual interest rate is raised to the number of compound periods minus one. The final step is to deduct the initial loan principal from the calculated value.

When the amount compounds quarterly, it means that the amount compounds 4 times in a year. i.e., n = 4. We use this fact to derive the quarterly compound interest formula. Thus, the quarterly compound interest formula is:

$3000 deposit that earns 6% annual interest compounded quarterly.

A = P (1 + r/4)4

A = 3000(1+6/4)

$5000 deposit that earns 7.2% annual interest compounded monthly.

A = P (1 + r)

A = 5000(1+7.2)  

Hence the function for the given compound interest will be A = 3000(1+6/4)  and A = 5000(1+7.2)  .

Learn more about compound interest, by the following link

https://brainly.com/question/3989769

#SPJ1

Answer:

x=6

Step-by-step explanation:

10x+20=80

10x=60

x=6

In linear equation , The fifth son is younger than first son will be 31/3. And The age of the fifth son will be 1 and 5/12.

What in mathematics is a linear equation?

A linear equation is a first-order (linear) term plus a constant in the algebraic form y=mx+b, where m is the slope and b is the y-intercept.  

                                              The variables in the previous sentence, y and x, are referred to as a "linear equation with two variables" at times.

In a family, there are five sons. The oldest son is 11 and 3/4 years old, and every next younger brother is younger than the next by 2 and 7/12 years.

Then the fifth son is younger than first son will be

⇒ 4(2 + 7/12)

⇒ 4(31/12)

⇒ (31/3)

The age of the fifth son will be

⇒ (11 + 3/4) – 4(2 + 7/12)

⇒ (47/4) – 4(31/12)

⇒ (47/4) – (31/3)

⇒ 17/12

⇒ 1 + 5/12

Learn more about linear equation

brainly.com/question/11897796

#SPJ1

The instantaneous rate of change of 2/(t-3) when the variable is equal to -1, is:

f'(-1) =  -1/8

Here we have the function:

f(t) = 2/(t - 3)

To find the instantaneous rate of change at t = -1, we need to differentiate the function with respect to t, and then evaluate it at t = -1

First, the derivate of the function is:

f'(t) = df(t)/dt = (-1)*2/(t - 3)²

f'(t) = -2/(t - 3)²

Now to get the instantaneous rate of change, we evaluate the above function in t = -1 we will get:

f'(-1) = -2/(-1 - 3)² = -2/16 = -1/8

Learn more about derivates by reading:

https://brainly.com/question/12047216

#SPJ1

Answer:

The answer is (d) y=3x+2

Inserting the given points in the given equation yields the answer. To make the process faster, insert the zero first then you will get y=2. You have to choose whether B and D. Then insert the x values and you will obtain the correct answer which is valid for the given points x and y.

The z-score for a temperature of 71 degrees is -0.75.

What is the z-score?

When assessed in terms of standard deviation units, a raw score's location in relation to its distance from the mean is indicated by a z-score. If a value is above the mean, the z-score is positive; if it is below the mean, it is negative.

The raw score less the population mean, divided by the population standard deviation, is the z-score.

Here, the mean average temperature is 74°, standard deviation is 4, and the raw score is 71°.

The formula for calculating z-score is -

Z = (x-μ)/σ

Where x is raw score, μ is mean and σ is standard deviation.

Plugging in the values -

Z = (71-74)/4

Z = -3/4

Z = -0.75

Therefore, the z-score is obtained as -0.75.

To learn more about z-score from the given link

https://brainly.com/question/25638875

#SPJ1

Answer:

114

Explanation:

18.6 rounds up to 19

6.5 rounds down to 6

19 x 6 = 114

The Total number of smoothies after calculating are 100 .

What is ratio ?

ratio can be defined as the Given value divided by the total value, is called as ratio.

Given ,

Sally's Smoothies makes two flavors: strawberry and banana. The ratio of strawberry

smoothies to banana smoothies is 3:2.

If Sally makes 60 strawberry smoothies, The number of total smoothies does she make are.

let the banana smoothie be x .

so,

3/2 = 60/x

x = 2* 60 / 3

x = 2*20

x = 40

Total number of smoothies are = 60+40 = 100

Hence , The Total number of smoothies are 100 .

To learn more about ratio from the given link.

https://brainly.com/question/13419413

#SPJ1

Answer:

i think the answer is one

Step-by-step explanation:

The solution is : The correlation coefficient is -1

A correlation coefficient is a numerical measure of some type of correlation, meaning a statistical relationship between two variables. The variables may be two columns of a given data set of observations, often called a sample, or two components of a multivariate random variable with a known distribution.

Here, we have,

we want to get the correlation coefficient for the given dataset

from the table, what do we observe?

As x is increasing by 5 units;

y is decreasing by 5 units

What this mean is that there is a negative correlation between both

This means the linear regression will go through every point, and will be a perfect fit. The correlation coefficient, r, of a data set is 1 if it is a perfect positive fit and -1 if it is a perfect negative fit; since the slope is decreasing, this is a negative correlation, and since it fits perfectly, it is -1.

Thus, what we have here is that, since the rate of increase/decrease on both ends is of equal magnitude but opposite signs, we can conclude that the correlation coefficient is -1

learn more on correlation coefficient:

https://brainly.com/question/4184524

#SPJ5