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Fiesta28 [93]
3 years ago
12

If x - 12y = -210 and x - 6y = 90, then x =

Mathematics
1 answer:
Annette [7]3 years ago
3 0
X=-198(substitute the value of x into the equation)
x-6y=90

-198-6y=90(solve the equation)

y=-48(a possible solution is)

(x,y)=(198,-48). (check yhe solution)

-198-12= 210(simplify)
-198-6(-48)=90

-210=-210( the ordered pair is a solution)
90=90

(x,y)=(198,-48)
is the answer
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Answer:

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Step-by-step explanation:

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After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X. Subtracting 1 by the pvalue, we This p-value is the probability that the value of the measure is greater than X.

In this problem, we have that:

A distribution that can be approximated by a normal distribution with a mean value of 145 sec and a standard deviation of 25 sec, so \mu = 145, \sigma = 25.

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This is the value of X when Z has a pvalue of 0.90.

Z has a pvalue of 0.90 when it is between 1.28 and 1.29. So we want to find X when Z = 1.285.

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