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3 years ago

Solve for x. A. 9 B. 12 C. 1 D. 7

Mathematics

1 answer:

Tresset [83]3 years ago

5 0

Answer:

Step-by-step explanation:

use Tangent-chord formula for finding the arc knowing E

x=1/2n

4x+19=1/2n

n=8x+38

both arcs = 360

28x-2+8x+38=360

x=9

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Number of Text Messages a Day A random sample of n = 755 US cell phone users age 18 and older in May 2011 found that the average

Alexeev081 [22]

Answer:

The 95% confidence interval is (29.54 - 53.46}

Step-by-step explanation:

given data:

$\hat X = 41.5$

Se = 6.1

n = 755

a) best estimate $\hat x = 41.5$

b) at 95% confidence interval

$\alpha = 1- 0.95 = 0.05$

$\alpha /2 = 0.025$

$z_{\alpha/2} = z_{0.025} = 1.96$

at 95% confidence interval for [/tex]\mu[/tex]

$\hat x \pm z_{\alpha /2} \times Se$

$41.5 \pm 1.96\times 6.1$

$41.5 \pm 11.96$

The 95% confidence interval is (29.54 - 53.46}

7 0

3 years ago

Pls help, will mark brainliest

SashulF [63]

Step-by-step explanation:

$\frac{\pi}{2} = 90$

its 1/4 of the circle

circle circumference:

$8 \times \pi$

we need 1/4 of it, so its

$2 \times \pi = 6.28$

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2 years ago

Write an equivalent expression for 7(2x - 3y + 6) by modeling and by using the distributive property.

alexandr402 [8]

14x-21y+42 is the answer to this question.

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3 years ago

What is the determinant of m= {5 8 -5 4} ? 20 40 60 80

likoan [24]

Answer:

Step-by-step explanation:

We have been given the matrix;

$\left[\begin{array}{ccc}5&8\\-5&4\end{array}\right]$

For a 2-by-2 matrix, the determinant is calculated as;

( product of elements in the leading diagonal) - (product of elements in the other diagonal)

determinant = ( 5*4) - (8*-5)

= 20 - (-40) = 60

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3 years ago

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Hoochie [10]

Answer:

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2 years ago