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Mathematics

2 answers:

daser333 [38]2 years ago

6 0

Answer:

3x - 2(-x-5) =0

3x +2x +10 =0

5x +10 =0

5x=-10

divide both sides by 5

x = -2

to find the value of y subst.the value of x

y= -x -5

y= -(-2)-5

y=-3

AfilCa [17]2 years ago

4 0

Answer :
x = -1 and y = -4

Solution :

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I’m another normally distributed test score is 80 and the standard deviations is 10. How common are values in the less than 60?

lord [1]

Answer:

The probability of obtaining a score less than 60 is 2.28%

It happens 2 out of 100 times.

Step-by-step explanation:

If the mean μ = 80 and the standard deviation σ = 10, then we need to find the probability that an X value is less than 60.

Then we find

$P(X$

To find this probability we use the Z statistic.

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

$P(\frac{X- \mu}{\sigma}$

$P(Z$

This is the same as

$P(Z> 2)$

We look for this value in the table for the normal distribution of right queue and we have:

$P(X 2) = 0.02275$

The probability of obtaining a score less than 60 is 2.28%

It happens 2 out of 100 times.

6 0

2 years ago

What percent of 80 is 90

Serhud [2]

$\text{What percent of 80 is 90?}\\\\\text{Calculate what fraction of the number 90 is 80}\\\\\dfrac{80}{90}=\dfrac{8}{9}\\\\\text{Convert it to percent}\\\\\dfrac{8}{9}\cdot100\%=\dfrac{800}{9}\%=88\dfrac{8}{9}\%\\\\Answer:\ \boxed{80\ is\ 88\dfrac{8}{9}\%\ of\ 90}$