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3 years ago

Solve for x: one over five (5x + 12) = 18 please step this out for me

Mathematics

1 answer:

kobusy [5.1K]3 years ago

3 0

Answer:

x = 6/5

x = 1.2

x = 1 1/5

Step-by-step explanation:

The answers above are all the same, but in different forms.

The steps to getting x:

1. subtract 12 from the parenthesis which leaves us with 5x = 6

2. Then we want to divide 5 from x which gives up our answer 5x/5 = 6/5

Remember whatever you do on one side it has to be done on the other, hence the equal sign

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2 years ago

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Step-by-step explanation:

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3 years ago

Life tests on a helicopter rotor bearing give a population mean value of 2500 hours and a population standard deviation of 135 h

stira [4]

Answer:

The percent of the parts are expected to fail before the 2100 hours is 0.15.

Step-by-step explanation:

Given :Life tests on a helicopter rotor bearing give a population mean value of 2500 hours and a population standard deviation of 135 hours.

To Find : If the specification requires that the bearing lasts at least 2100 hours, what percent of the parts are expected to fail before the 2100 hours?.

Solution:

We will use z score formula

$z=\frac{x-\mu}{\sigma}$

Mean value = $\mu = 2500$

Standard deviation = $\sigma = 135$

We are supposed to find If the specification requires that the bearing lasts at least 2100 hours, what percent of the parts are expected to fail before the 2100 hours?

So we are supposed to find P(z<2100)

so, x = 2100

Substitute the values in the formula

$z=\frac{2100-2500}{135}$

$z=−2.96$

Now to find P(z<2100) we will use z table

At z = −2.96 the value is 0.0015

So, In percent = $.0015 \times 100=0.15\%$

Hence The percent of the parts are expected to fail before the 2100 hours is 0.15.

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3 years ago