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3 years ago

(08.04 LC)

Mathematics

1 answer:

nirvana33 [79]3 years ago

4 0

I think it’s median 2

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What is 3(a-7) simplifyed

Dovator [93]

Answer:

$3a - 21$

Step-by-step explanation:

Given

$3(a - 7)$

Required

Simplify

To do this, we apply distributive property;

$3(a - 7)= 3 * a - 3 * 7$

$3(a - 7)= 3a - 21$

Hence, the simplified form is $3a - 21$

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3 years ago

Solve for X 35 34.5 34 17

Jlenok [28]

Answer:

the area of this shape equals 247.75

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3 years ago

Find f(5) in the function f(x)=-2(x+1).

s2008m [1.1K]

Answer:

f(x)=-2(1/2 x^2+x) +c

Step-by-step explanation:

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2 years ago

Read 2 more answers

In a sample of 8 high school students, they spent an average of 28.8 hours each week doing sports with a sample standard deviati

Alja [10]

Answer:

$26.12\:$

Step-by-step explanation:

Since the population standard deviation $\sigma$ is unknown, and the sample standard deviation $s$ , must replace it, the $t$ distribution must be used for the confidence interval.

The sample size is n=8.

The degree of freedom is $df=n-1$ , $\implies df=8-1=7$ .

With 95% confidence level, the $\alpha-level$ (significance level) is 5%.

Hence with 7 degrees of freedom, $t_{\frac{\alpha}{2} }=2.365$ . (Read from the t-distribution table see attachment)

The 95% confidence interval can be found by using the formula:

$\bar X-t_{\frac{\alpha}{2}}(\frac{s}{\sqrt{n} } )\:$ .

The sample mean is $\bar X=28.8$ hours.

The sample sample standard deviation is $s=3.2$ hours.

We now substitute all these values into the formula to obtain:

$28.8-2.365(\frac{3.2}{\sqrt{8} } )\:$ .

$26.12\:$

We are 95% confident that the population mean is between 26.12 and 31.48 hours.

4 0

3 years ago

Liz earns a salary of $2,100 per month, plus a commission of 3% of her sales. She wants to earn at least $2,900 this month. Ente

juin [17]

Answer:

x≥26667

Step-by-step explanation:

let x= her sales

so the money she gets from her sales is .03x

if we wants at least 2900 we can write

2100+.03x≥2900

Solve for x

.03x≥800

x≥26666.6667

round up (because you can make a fraction of a sale) to get

x≥26667

8 0

3 years ago