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3 years ago

I NEED HELP!!!!!!!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

AnnZ [28]3 years ago

8 0

Answer:

all is easy first do it in the bracketsand do it divied multiply add and substrate

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Answer:

$\frac{1}{10}$

Step-by-step explanation:

→ Divide the gallon by the number of glasses

$\frac{1}{10}$

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A square table is to be covered with small square ceramic tiles. The table has an area of 4 square feet.how many tiles are neede

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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.

5 0

3 years ago

If someone could work out the first half of the problem and explain that would be great!

andrew-mc [135]

Answer:

x = -5

y = -5

Step-by-step explanation:

If you multiply the top equation by negative 2, you can add it to the bottom equation and cancel out the x:

-2(-x + 5y = -20) --> 2x - 10y = 40

Add this to the bottom equation top to bottom:

2x - 10y = 40

-2x + 4y = -10

You get:

-6y = 30

Then solve for y:

y = -5

Plug this back in for either equation and solve for x:

-x + 5(-5) = -20

-x -25 = -20

-x = 5

x = -5

Your answers are:

x = -5

y = -5

7 0

3 years ago

Read 2 more answers