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3 years ago

Solve for x3x + 7 = -2

Mathematics

2 answers:

8090 [49]3 years ago

4 0

Answer:

Hello There!!

Step-by-step explanation:

3x+7=-2 (-7 from both sides)

-7 -7

3x=-9 (divide by 3 from both sides)

÷3 ÷3

x=-3

hope this helps,have a great day!!

~Pinky~

lidiya [134]3 years ago

3 0

Answer:

x = -3

Step-by-step explanation:

1. Write the equation

3x + 7 = -2

2. -7 from both sides

3x = -9

3. Divide 3 from both sides to get x alone

x = -3

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4 years ago

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Step-by-step explanation:

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SAT scores have a mean of 1026 and a standard deviation of 209. ACT scores have a mean of 20.8 and a standard deviation of 4.8.

Y_Kistochka [10]

Answer:

The z-score for SAT exam of junior is much small than his ACT score. This means he performed well in his ACT exam and performed poor in his SAT exam.

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We are given SAT and ACT scores of a student and we have to compare them. We cannot compare them directly so we have to Normalize them i.e. convert them into such a form that we can compare the numbers in a meaningful manner. The best way out is to convert both the values into their equivalent z-scores and then do the comparison. Comparison of equivalent z-scores will tell us which score is higher and which is lower.

The formula to calculate the z-score is:

$z=\frac{x-\mu}{\sigma}$

Here, μ is the mean and σ is the standard deviation. x is the value we want to convert to z score.

z-score for junior scoring 860 in SAT exam will be:

$z=\frac{860-1026}{209}=-7.59$

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The z-score for SAT exam of junior is much small than his ACT score. This means he performed well in his ACT exam and performed poor in his SAT exam.

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3 years ago

The sum of twice a number and 13 is 75

Nina [5.8K]

So what they are saying is the sum of 2x +13=75
Therefore we can just solve for 2x, our unknown value.
2x+13=75 now subtract 13 and divide by 2 from both sides of equation to not change the equation
x+13-13=75-13
This leaves us with
x=(75-13)/2=31 therefore x=31 or our unknown value is 31.

I hope this helped. Any questions please just ask. Thank you.

3 0

3 years ago

Solve for x3x + 7 = -2​

Solve for x3x + 7 = -2