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2 years ago

Which function is positive for the entire interval [-3, -2]?

Mathematics

1 answer:

Aleksandr-060686 [28]2 years ago

4 0

Answer:

Answer: A function that is positive in the entire interval [-3, -2] is -x2 - 5x - 5. Let's understand the solution. Explanation: If the function is represented by a downward parabola, then the function must be quadratic and the coefficient of x2 must be negative.

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Practice and problem lesson 25

OverLord2011 [107]

Answer:

WHAT IS LESSON 25 BRO

Step-by-step explanation:

7 0

3 years ago

Using the simple random sample of weights of women from a data set, we obtain these sample statistics: nequals45 and x overbar

Tomtit [17]

Answer: (141.1, 156.48)

Step-by-step explanation:

Given sample statistics : $n=45$

$\overline{x}=148.79\text{ lb}$

$\sigma=31.37\text{ lb}$

a) We know that the best point estimate of the population mean is the sample mean.

Therefore, the best point estimate of the mean weight of all women = $\mu=148.79\text{ lb}$

b) The confidence interval for the population mean is given by :-

$\mu\ \pm E$ , where E is the margin of error.

Formula for Margin of error :-

$z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given : Significance level : $\alpha=1-0.90=0.1$

Critical value : $z_{\alpha/2}=z_{0.05}=\pm1.645$

Margin of error : $E=1.645\times\dfrac{31.37}{\sqrt{45}}\approx 7.69$

Now, the 90% confidence interval for the population mean will be :-

$148.79\ \pm\ 7.69 =(148.79-7.69\ ,\ 148.79+7.69)=(141.1,\ 156.48)$

Hence, the 90% confidence interval estimate of the mean weight of all women= (141.1, 156.48)

3 0

3 years ago

Peter bought p shirts at $(p-4) each. He spent $60 on the shirts. Determine the number of shirts bought.

DochEvi [55]

Answer:

He bought fifteen shirts.

Step-by-step explanation:

Divide the price of the shirts to mow much they each cost.

4 0

3 years ago

Solve 4(x + 2) = 20

KiRa [710]

Answer:

x = 3

Explanation:

$\sf 4(x + 2) = 20$

$\sf 4x + 8 = 20$

$\sf 4x = 20 - 8$

$\sf 4x = 12$

$\sf x = \frac{12}{4}$

$\sf x = 3$

check:

4(x + 2) = 20

4(3 + 2) = 20

4(5) = 20

20 = 20

Hence proved x = 3

4 0

2 years ago

Read 2 more answers

Connor created angle that formed 130°.What type of angle did he create?

klio [65]

D. Obtuse angle
and heres how I got it

An obtuse angle is 130 degrees. Any angle more than 90 degrees is obtuse, any angle under 90 degrees is acute, and 90 degrees is a right angle<span>.</span>

7 0

3 years ago