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3 years ago

I need help! Does anyone know how to solve this?

Mathematics

1 answer:

viva [34]3 years ago

8 0

Your answer is 9 for this problem

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88) 4 times a number decreased by 8 equals 40<br> A) x=80 B) x = 40 C) x=8<br> D) x = 12

dimulka [17.4K]

D=12
Because if you write down the equation 4x-8=40 and plug in 12. 4 times 12 is 48
. 48-8 equals 40

6 0

3 years ago

NEED HELP ASAP!!!!!

Serggg [28]

Answer:

the correct answer is

The expression that represents Capri’s age is a + 4.

The expression that represents Portia’s age is a – 5.

Solving this equation will give Aziza’s age.

Step-by-step explanation:

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3 years ago

5. Simplify the expression -3 1/6 dividend by -1 4/9

eimsori [14]

Answer:

57/26 or 2 5/26

Step-by-step explanation:

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3 years ago

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Tickets to a movie cost $7.25 for adults and $5.50 for students. A group of friends purchased 8 tickets for a total price of $52

ANEK [815]

5 tickets for adults and 3 for students.

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3 years ago

Among 420 randomly selected employees at a company, the mean number of hours of overtime worked per month is 10 hours and the st

kari74 [83]

The margin of error of the random selection is 0.20

The given parameters are:

$n = 420$ --- the sample size

$\sigma = 1.6$ --- the standard deviation

$\bar x = 10$ --- the mean

$\alpha = 99\%$ --- the confidence level.

The margin of error (E) is calculated as follows:

$E = z \times \sqrt{\frac{\sigma^2}{n}}$

So, we have:

$E = z \times \sqrt{\frac{1.6^2}{420}}$

$E = z \times \sqrt{\frac{2.56}{420}}$

The z-value for 99% confidence level is 2.576.

Substitute 2.576 for z

$E = 2.576 \times \sqrt{\frac{2.56}{420}}$

$E = 2.576 \times \sqrt{0.006095}$

Take square roots

$E = 2.576 \times 0.0781$

Multiply

$E = 0.2012$

Approximate

$E = 0.20$

Hence, the margin of error is 0.20