All categories

2 years ago

Solve for x. -3/5x = 15 A. -25 B. -9 C. -6 D. 9

Mathematics

2 answers:

CaHeK987 [17]2 years ago

6 0

Answer: If the question is formed as (- 3/5) x = 15

then A is correct

X=-25

Step-by-step explanation:

vitfil [10]2 years ago

3 0

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Suppose that at a state college, a random sample of 41 students is drawn, and each of the 41 students in the sample is asked to

ra1l [238]

Answer:

The confidence interval for 90% confidence would be narrower than the 95% confidence

Step-by-step explanation:

From the question we are told that

The sample size is n = 41

For a 95% confidence the level of significance is $\alpha = [100 - 95]\% = 0.05$ and

the critical value of $\frac{\alpha }{2}$ is $Z_{\frac{\alpha }{2} } =Z_{\frac{0.05 }{2} }= 1.96$

For a 90% confidence the level of significance is $\alpha = [100 - 90]\% = 0.10$ and

the critical value of $\frac{\alpha }{2}$ is $Z_{\frac{\alpha }{2} } =Z_{\frac{0.10 }{2} }= 1.645$

So we see with decreasing confidence level the critical value decrease

Now the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{s}{\sqrt{n} }$

given that other values are constant and only $Z_{\frac{\alpha }{2} }$ is varying we have that

$E\ \ \alpha \ \ Z_{\frac{\alpha }{2} }$

Hence for reducing confidence level the margin of error will be reducing

The confidence interval is mathematically represented as

$\= x - E < \mu < \= x + E$

Now looking at the above formula and information that we have deduced so far we can infer that as the confidence level reduces , the critical value reduces, the margin of error reduces and the confidence interval becomes narrower

3 0

2 years ago

What is the value of the expression |a + b| + |c| when a = –6, b = 2, and c = –11?

iVinArrow [24]

The answer is D. -15 because I am assuming that the vertical lines mean brackets, and we have to work out the brackets first (according to BIDMAS). Doing so, -6 + 2 = -4 and -4 + -11 = -15.

8 0

3 years ago

PLEASE HELP ME WITH THIS MATH TEST

Troyanec [42]

Answer: 40 cm ^2

Step-by-step explanation:

cuz math

4 0

3 years ago

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Cassi collects glass bottles for a deposit.She can earn $0.25 for five bottles.Last week she earns $12.75.How many bottles did C

garik1379 [7]

$0.25 = 5 bottles

Divide both sides by 5:

$0.05 = 1 bottle

Last week: $12.75

12.75 = 0.05b where b represents bottles

Divide all by 0.05 to get b alone:

255 = b

7 0

3 years ago

Which line shows the first error in the solution? WILL GIVE BRAINLIEST ANSWER

creativ13 [48]

Answer:

I would go with C.Line 4

Please mark brainliest!

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers