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3 years ago

Need help for test asap!

Mathematics

1 answer:

klio [65]3 years ago

3 0

Answer:

do the test then

Step-by-step explanation:

do the test then

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Solve the following system of equations:<br> x + y = -4<br> -x + y = 6

DochEvi [55]

But I am not sure about my answer.....

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3 years ago

Talk the Talk Cellular charges a base rate of $20 per month for unlimited texts plus $.15 per minute of talk time. Write an equa

ElenaW [278]

Answer:

y = 20 + 0.15x

where x = each minute of talk time

y = total cost

domain [0, ∞)

range [20, ∞)

Step-by-step explanation:

Your equation is like that because you always pay $20 per month, no matter how many minutes you used. Then you have 0.15 per minute so use x as a variable placeholder for the actual number of minutes.

domain is starting from 0 because you can't have negative minutes.

range is at least 20 because you pay $20 to use it even if you don't use any minutes. So it can't be less than $20.

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3 years ago

Alex wants to test the reliability of “lie detector tests,” or polygraph tests. He performs a polygraph test on a random sample

VladimirAG [237]

The correct statement is test is reliable and authentic as the probability of no false positives is more than 0.5

Given that

$H_o:P= 0.50\\\\H_1:P>0.50$

Now following calculations to be done to reach out the conclusion

There is no false positive as

= 100 - 5.5

= 94.5%

$\hat P =0.945, n = 12$

Now

$z = \frac{\hat P - P}{\sqrt\frac{P(1-P)}{n} }\\\\=\frac{0.945-0.5}{\sqrt\frac{0.5\times0.5}{12} } \\\\= 3.08$

P value = P(z >3.08) = 0.0010

Therefore we can conclude that test is reliable and authentic as the probability of no false positives is more than 0.5

Learn more about the polygraph test here:

brainly.com/question/3790493

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3 years ago

Andrew is creating a rectangular dog run in his back yard. The length of the dog run is 18 feet. The perimeter of the dog run mu

ale4655 [162]

Answer: $3\leq x \leq 18$

Step-by-step explanation:

Given, the length of the rectangular dog run is 18 feet.

Formula: Perimeter = 2 ( length + width)

Let width be x.

Then, Perimeter = 2 (18 + x ) feet

The perimeter of the dog run must be at least 42 feet and no more than 72 feet.

That is

$42\leq 2 (x+18)\leq 72$

Divide inequality by 2, we get

$21\leq 18+x\leq 36$

Subtract 18 from each side, we get

$3\leq x \leq 18$

Required inequality : $3\leq x \leq 18$

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3 years ago

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kompoz [17]

Answer:

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Step-by-step explanation:

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3 years ago