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JulsSmile [24]
3 years ago
14

Twelve decreased by two times a number is 8. Find the number.

Mathematics
2 answers:
Law Incorporation [45]3 years ago
7 0

Answer:

x = 2

Step-by-step explanation:

We can make an equation that meets the requirements stated.

Decreased signifies subtraction, so 12 will reduce the value after it. A number can be any letter you'd like, but I'll stick to x. Since 2 is multiplying <em>that</em> number, we can make 2 the coefficient. Finally, set it equal to 8.

12 - 2x = 8 Subtract 12 from both sides of the equation.

-2x = -4 Divide by -2 on both sides of the equation.

x = 2

lora16 [44]3 years ago
4 0

Answer:2

Step-by-step explanation: 12-8=4 4/2=2

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A test is used to assess readiness for college. In a recent​ year, the mean test score was 20.3 and the standard deviation was 4
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Answer:

\mu = 20.3

\sigma = 4.9

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Low\leq \mu -2 \sigma= 20.3- 2*4.9 = 10.5

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Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

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Solution to the problem

For this case we can consider a value to be significantly low if we have that the z  score is lower or equal to - 2 and we can consider a value to be significantly high if its z score is  higher tor equal to 2.

For this case we have the mean and the deviation given:

\mu = 20.3

\sigma = 4.9

And we can find the limits in order to consider values as significantly low and high like this:

Low \leq \mu -2 \sigma= 20.3- 2*4.9 = 10.5

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The Answer is A. I made a graph and those points are the only ones that made a line.

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