Ask question

Ask question

All categories

3 years ago

15

Simplify each expression 7(3x)

1 answer:

Tanzania [10]3 years ago

3 0

21x because when a number (7) is right beside a number in parentheses it means that the number in the parentheses is being multiplied by the number next to the parentheses and then at the end when you get the answer you just put the x beside the answer.

You might be interested in

Evaluate the expression

zheka24 [161]

Answer:

Step-by-step explanation:

x³ = 4³ = 4 * 4 * 4 = 64

4 0

3 years ago

Read 2 more answers

The weights of 67 randomly selected axles were found to have a variance of 3.85. Construct the 80% confidence interval for the p

VLD [36.1K]

Answer:

$3.13$

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 67

Variance = 3.85

We have to find 80% confidence interval for the population variance of the weights.

Degree of freedom = 67 - 1 = 66

Level of significance = 0.2

Chi square critical value for lower tail =

$\chi^2_{1-\frac{\alpha}{2}}= 51.770$

Chi square critical value for upper tail =

$\chi^2_{\frac{\alpha}{2}}= 81.085$

80% confidence interval:

$\dfrac{(n-1)S^2}{\chi^2_{\frac{\alpha}{2}}} < \sigma^2 < \dfrac{(n-1)S^2}{\chi^2_{1-\frac{\alpha}{2}}}$

Putting values, we get,

$=\dfrac{(67-1)3.85}{81.085} < \sigma^2 < \dfrac{(67-1)3.85}{51.770}\\\\=3.13$

Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.

8 0

3 years ago

What is the equation for the axis of symmetry of the graph of this function?

poizon [28]

F is the anwser:))))))))))

6 0

3 years ago

Simplify -4(x - 5) + 3(a - 7)

STatiana [176]

using the distributive property:

-4x + 20 + 3a - 21

Then combine like terms:

-4x + 3a - 1

A is the answer

7 0

3 years ago

Damian owns a small business selling bagels. He knows that in the last week 40 customers paid cash, 66 customers used a debit ca

PSYCHO15rus [73]

Answer:

Cash

Step-by-step explanation:

You got that money just have damian ask fo that cash$$$$$$

7 0

3 years ago

Read 2 more answers