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Cerrena [4.2K]
3 years ago
8

Solve each system of equations using the elimination method. check the solution.

Mathematics
1 answer:
Blababa [14]3 years ago
4 0
5. the answer is (x,y) = (-1,5)

6. the answer is (x,y) = (0,2)

7. the answer is (x,y) = (-2,1)

8. the answer is (x,y)= (5,0)
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Consider a value to be significantly low if its z score less than or equal to minus−2 or consider a value to be significantly hi
katrin2010 [14]

Answer:

Test scores of 10.2 or lower are significantly low.

Test scores of 31.4 or higher are significantly high.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. 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, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 20.8, \sigma = 5.3

Identify the test scores that are significantly low or significantly high.

Significantly low

Z = -2 and lower.

So the significantly low scores are thoses values that are lower or equal than X when Z = -2. So

Z = \frac{X - \mu}{\sigma}

-2 = \frac{X - 20.8}{5.3}

X - 20.8 = -2*5.3

X = 10.2

Test scores of 10.2 or lower are significantly low.

Significantly high

Z = 2 and higher.

So the significantly high scores are thoses values that are higherr or equal than X when Z = 2. So

Z = \frac{X - \mu}{\sigma}

2 = \frac{X - 20.8}{5.3}

X - 20.8 = 2*5.3

X = 31.4

Test scores of 31.4 or higher are significantly high.

3 0
3 years ago
What is the point slope form of the line with slope 2/5 that passes through the point (-4,-7) ?
Korolek [52]
The point slope form of the line is:

D. y+4=2/5(x+7)

4 0
3 years ago
Read 2 more answers
Help Please (I needed 20 characters)
liq [111]
Is a (0,18) ? not sure though baha.
4 0
3 years ago
Someone please help me , it's not the 1st one , I tried that
ludmilkaskok [199]
They are corresponding angles because they are in the same spot on either side of the parallel lines.
4 0
3 years ago
Read 2 more answers
Mike earned $11.76 per hour for working 23.5 hours last week. how much money did mike earn last week?
densk [106]
Just multiply.

11.76 * 23.5= 276.36

So Mike earned $276.36 last week
6 0
3 years ago
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