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3 years ago

Need help with simplifying expressions

Mathematics

2 answers:

dolphi86 [110]3 years ago

5 0

The answer is -20

I know it looks hard, but all you need to do is combine like terms.

Here’s an example:

4x+5x=18

4x plus 5x equals 9x. So your equation is now-

9x=18

Now you just divide 18 by 9

which is 2, and you just drop the x

Hope this helps

Ilia_Sergeevich [38]3 years ago

3 0

Answer:

A) -20

Step-by-step explanation:

distribute the 4y and the -4 to the parentheses

16y^2 -16y+16y-20-16y^2

combine like terms

16y^2-16y^2=0

-16y+16y=0

-20

Mark brainliest??

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Solution:

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A quality control expert at Glotech computers wants to test their new monitors. The production manager claims they have a mean l

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Answer:

The probability that the mean monitor life would be greater than 96.3 months in a sample of 84 monitors

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Step-by-step explanation:

Step(i):-

Given that the mean of the Population = 95

Given that the standard deviation of the Population = 5

Let 'X' be the random variable in a normal distribution

Let X⁻ = 96.3

Given that the size 'n' = 84 monitors

Step(ii):-

The Empirical rule

$Z = \frac{x^{-} -mean}{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{96.3 - 95}{\frac{5}{\sqrt{84} } }$

Z = 2.383

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P(X⁻ ≥ 96.3) = P(Z≥2.383)

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Final answer:-

The probability that the mean monitor life would be greater than 96.3 months in a sample of 84 monitors

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