Can someone help me plz I will make brainliest. For correct answers only

The coefficient of determination is calculated as: 0.520.

The coefficient of determination = the square of the correlation coefficient.

Given the following:

Value of the linear correlation coefficient (r) = -0.721

Therefore, we would have:

The coefficient of determination = (-0.721)²

The coefficient of determination = 0.520

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The expression of "The difference of -10 and the product of p and q" in algebraic notation is pq + 10

From the question, we have the following parameters that can be used in our computation:

The difference of -10 and the product of p and q

The numbers are given as

p and q

The product of p and q means pq

So, we have the following

The difference of -10 and pq

The difference of -10 and pq means

pq + 10

Hence, the expression is pq + 10

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The probability that the friend is between 10 and 30 minutes late is approximately 0.6667, or 66.67%.

Since the probability density function is uniform, the probability of the friend being between 10 and 30 minutes late is equal to the area of the rectangle that lies between x = 10 and x = 30, and below the curve of the probability density function.

The height of the rectangle is equal to the maximum value of the probability density function, which is 1/30 since the interval of possible values for x is [0, 30] minutes.

The width of the rectangle is equal to the difference between the upper and lower limits of the interval, which is 30 - 10 = 20 minutes.

Therefore, the probability of the friend being between 10 and 30 minutes late is:

P(10 < x < 30) = (height of rectangle) x (width of rectangle)

= (1/30) x 20

= 2/3

≈ 0.6667

So the probability that the friend is between 10 and 30 minutes late is approximately 0.6667, or 66.67%.

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Answer:

77

Step-by-step explanation:

x = hamburgers

3x = cheeseburgers

3x + x = 308

4x= 308

x = 77

Answer:

77

Step-by-step explanation:

Answer:

2+2= 4 but 3+3 = 6

Step-by-step explanation:

please mark me brainliest

Answer:

a) The minimum sample size is 601.

b) The minimum sample size is 2401.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \(\pi\), and a confidence level of \(1-\alpha\), we have the following confidence interval of proportions.

\(\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}\)

In which

z is the zscore that has a pvalue of \(1 - \frac{\alpha}{2}\).

The margin of error is:

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}}\)

For this problem, we have that:

We dont know the true proportion, so we use \(\pi = 0.5\), which is when we are are going to need the largest sample size.

95% confidence level

So \(\alpha = 0.05\), z is the value of Z that has a pvalue of \(1 - \frac{0.05}{2} = 0.975\), so \(Z = 1.96\).

a. If a 95% confidence interval with a margin of error of no more than 0.04 is desired, give a close estimate of the minimum sample size that will guarantee that the desired margin of error is achieved. (Remember to round up any result, if necessary.)

This is n for which M = 0.04. So

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}}\)

\(0.04 = 1.96\sqrt{\frac{0.5*0.5}{n}}\)

\(0.04\sqrt{n} = 1.96*0.5\)

\(\sqrt{n} = \frac{1.96*0.5}{0.04}\)

\((\sqrt{n})^2 = (\frac{1.96*0.5}{0.04})^2\)

\(n = 600.25\)

Rounding up

The minimum sample size is 601.

b. If a 95% confidence interval with a margin of error of no more than 0.02 is desired, give a close estimate of the minimum sample size necessary to achieve the desired margin of error.

Now we want n for which M = 0.02. So

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}}\)

\(0.02 = 1.96\sqrt{\frac{0.5*0.5}{n}}\)

\(0.02\sqrt{n} = 1.96*0.5\)

\(\sqrt{n} = \frac{1.96*0.5}{0.02}\)

\((\sqrt{n})^2 = (\frac{1.96*0.5}{0.02})^2\)

\(n = 2401\)

The minimum sample size is 2401.

Answer:

The circumference of the drive wheel is 10 feet * 3.14 = 31.4 feet.

The circumference of the vat is 18 feet * 3.14 = 56.52 feet.

The total length of belt needed to go around the drive wheel and the vat is 31.4 + 56.52 = 87.92 feet.

Answer:

The answer is B

Step-by-step explanation:

I am 100% sure

Answer:

470

Step-by-step explanation:

x is the amount that represents 100 %

517 amount that represents 100%+10% increase = 110%

x = (517 *100) / 110 = 470 is the original amount

Answer:

B. 44°

Step-by-step explanation:

That's it.

90° + 46° + 44° = 180°

Answer:

m2 = 44°.

Step-by-step explanation:

The sum of the measures of the angles of a triangle always equals 180°.

One of the angles is a right angle, so its measure is 90°.

Let n equal m2.

90+46+n=180

n=44

Therefore, m2 = 44°.

The probability of 3 or more deaf people in a sample of 100 is given as follows:

0.3633 = 36.33%.

The mass probability formula, giving the probability of x successes, is of:

\(P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}\)

\(C_{n,x} = \frac{n!}{x!(n-x)!}\)

The parameters are given by:

The values of the parameters for this problem are given as follows:

p = 0.02, n = 100.

The probability of 3 or more deaf people are given as follows:

P(X >= 3) = 1 - P(X < 3).

In which:

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2).

Hence:

Thus:

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)

P(X < 3) = 0.1326 + 0.2707 + 0.2334

P(X < 3) = 0.6367.

P(X >= 3) = 1 - P(X < 3).

P(X >= 3) = 1 - 0.6367.

P(X >= 3) = 0.3633.

We suppose that 2% of the population is deaf, and want to find the probability of 3 or more deaf people in a sample of 100.

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Answer:

-12

Step-by-step explanation:

To evaluate the expression the known value of a = -8 can be substituted in so the equation becomes -8 - 4.

From there the subtraction can be completed which equals -12. This can be visually seen on a number line if you look at -8 and move left 4 spaces.

Answer:

13 2/9

Step-by-step explanation:

Cows eats=5 3/5 Hays everyday

Horses eats=1 5/6 as much as the cow

=1 5/6 of what the cow eat+5 3/5

=1 5/6 × 5 3/5 + 5 3/5

=11/6×28/6+28/6

= 308/36+28/6

=308+168/36

=476/36

=13 8/36

=13 2/9

Answer: A & C

Step-by-step explanation:

\(i=\sqrt{-1}\)

\(\sqrt{-1} *\sqrt{4} =\sqrt{-4}\)

You can also simplify the above by taking the -4 out of the radical

It becomes 2 x \(\sqrt{-1}\), which can be simplifed to C

Answer:

\( - 9 \times - 10 = 90\)

Step-by-step explanation:

the answer is -9

hello, it's easy❤

answer is -9

Answer:

$16.20

Step-by-step explanation:

90 x .18 (Turn percent into decimal by moving decimal 2 places left)

$16.20

$16.20 in tips

hope this helps! :)

Step-by-step explanation:

3^6  = 3 * 3^5

 = 3 * 243 =  729

Answer:

18.09

Step-by-step explanation:2.4x2.4, then x3.14  

Answer:

answers below

Step-by-step explanation:

If you are trying to find the area the answers are:

Earth= 289.52918

Saturn=6,532.5021

The formula for area for a sphere is:

4 x pie x r2

If you are trying to find the volume the answers are:

Earth=57.90584

Saturn=46,647.01596

The formula for volume for a sphere is:

4/3 x pie x r3

Also the radius (r) is half of the diameter, so you divide the diameter by 2.

Answer: \(m\angle DE F=90^{\circ}\)

Step-by-step explanation:

The slope of \(DE\) is \(\frac{7-3}{5-4}=4\).

The slope of \(EF\) is \(\frac{3-2}{4-8}=-\frac{1}{4}\).

Thus, \(DE \perp EF\), meaning \(m\angle DE F=90^{\circ}\).

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The sinusoidal function has a period of 4 units. (Correct choice: D)

In this problem we have the representation of a sinusoidal function set on Cartesian plane, whose formula is introduced below:

y = A · cos (2π · x / T) + B

Where:

Graphically speaking, the period of the sinusoidal function is the horizontal distance between two consecutive upper peaks or between two consecutive lower peaks. By direct inspection, we conclude that the period of the sinusoidal function is 4 units.

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Answer:

36c - 28

Step-by-step explanation:

4(9c − 7)

Distribute

4 * 9c - 4*7

36c - 28

The function f(x) has five intercepts at -6 only, -2, -1, 1, and 3 only.

The correct answer is D.

The function f(x) has some specific characteristics as shown in the graph.

The graph of f(x) has five intercepts, as can be seen from the graph.

The intercepts of f(x) can be determined by observing where the graph of f(x) crosses the x-axis.

The function f(x) intercepts the x-axis at five different points: -6 only, -2, -1, 1, and 3 only.

At these points, f(x) = 0.
Furthermore, the graph of f(x) is increasing from -∞ to -6, then decreasing from -6 to -2.

The graph of f(x) then increases from -2 to -1, decreases from -1 to 1, increases from 1 to 3, and finally decreases from 3 to +∞.

Hence, we can deduce that the graph of f(x) has a local maximum point at x = -6, a local minimum point at x = -2, and another local minimum point at x = 3.
We can also conclude that f(x) is an odd function, meaning that f(-x) = -f(x).

This can be deduced from the symmetry of the graph about the origin.

Finally, we can see from the graph that the function f(x) is continuous everywhere except at x = -2 and x = 3.

At these points, f(x) is not defined.
The function f(x) has five intercepts at -6 only, -2, -1, 1, and 3 only.

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The angle that the vector "v = 9i + 8j - 4k" makes with the vector "u = 6i - 4j - k" is Acute Angle .

To determine the angle between two vectors, we need to find the dot product of the vectors and divide it by the product of their magnitudes.

If the result is positive, the angle between the vectors is acute, if it's negative the angle is obtuse, and if it's zero, the angle is a right angle.

In this case, the dot product of vectors "u" and "v" is:

⇒ (6i - 4j - k) . (9i + 8j - 4k) = 54 - 32 + 4 = 26  ;

The magnitude of vector "u" is = √(6² + (-4)² + (-1)²) = √(36 + 16 + 1) = √53

The magnitude of vector "v" is = √(9² + 8² + (-4)²) = √(81 + 64 + 16) = √161

So, the Cosine (Cos) of angle between two vectors "u" and "v" is:

⇒ Cos(θ) = 26/(√37 × √145) = 26/√5365  .

Since the value of Cos(θ) is positive, the angle between the vectors is acute. This means the vectors "u" and "v" are pointing in somewhat similar directions, but not exactly the same direction.

The given question is incomplete , the complete question is

Determine whether the angle vector "v" makes with vector "u" is acute, obtuse, straight, a right angle, or whether "v" is a vector in the same direction as "u" . u=6i-4j-k  and  v=9i+8j-4k .

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Answer:

Step-by-step explanation:

1.) No. of student who can play an instrument= 20÷100×1,080 =0.2×1,080 = 216

2.) Minimum rate Sheila can work in =20 problems÷ 5 mins= 4 problems/min

3.) 75%

Answer: 4/20, or 1/5

Step-by-step explanation: since there are 4 orange, and 20 total, then if you were to draw an orange it would be 4/20(this is very basic probability)

Answer:

A

Step-by-step explanation:

pretty sure thats it