ACT Math : How to find absolute value

Study concepts, example questions & explanations for ACT Math

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Example Questions

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Example Question #1 : How To Find Absolute Value

Solve

Possible Answers:

No solutions

All real numbers

Correct answer:

No solutions

Explanation:

Absolute values measure the distrance from the origin and is always positive, thus it can never be less than or equal to a negative number (unless a negative number is multiplied outside the absolute value).  So the correct answer is no solutions.

Example Question #2 : How To Find Absolute Value

Possible Answers:

Correct answer:

Explanation:

Absolute value is the key here. Absolute value means the number's distance from zero. So we must account for that. Therefore  .

Example Question #682 : Arithmetic

What are the values of a and b, if any, where –a|b + 7| > 0?

Possible Answers:

a<0 and b not equal to 7

a>0 and b not equal to 7

a>0 and b not equal to 7

a<0 and b = 7

Correct answer:

a<0 and b not equal to 7

Explanation:

The absolute value will always yield a positive, as long it is not zero. Therefore, b cannot equal 7. For the value to be positive, a must be a negative number.

Example Question #3 : How To Find Absolute Value

What is the absolute value of 19 – 36(3) + 2(4 – 87)?

Possible Answers:

293

168

–168

–255

255

Correct answer:

255

Explanation:

19 – 36(3) + 2(4 – 87) =

19 – 108 + 2(–83) =

19 – 108 – 166 = –255

Absolute value is the non-negative value of the expression

Example Question #4 : How To Find Absolute Value

Solve for z where | z + 1 | < 3

Possible Answers:

–4 < z < 2

1 < z < 3

1 < z

–4 < z

z < 1 or z > 3x

Correct answer:

–4 < z < 2

Explanation:

Absolute value problems generally have two answers:

z + 1 < 3 or z + 1 > –3 and subtracting 1 from each side gives z < 2 or z > –4 which bcomes –4 < z < 2

Example Question #3 : How To Find Absolute Value

Find the absolute value of the following when x = 2,

Possible Answers:

Correct answer:

Explanation:

 and 

It is important to know that the absolute value of something is always positive so the absolute value of  is 

2 is your answer.

Example Question #1762 : Sat Mathematics

Evaluate for :

Possible Answers:

Correct answer:

Explanation:

Example Question #3 : How To Find Absolute Value

Evaluate for  :

Possible Answers:

Correct answer:

Explanation:

Substitute 0.6 for  :

Example Question #1764 : Sat Mathematics

Evaluate for :

Possible Answers:

Correct answer:

Explanation:

Substitute .

Example Question #1765 : Sat Mathematics

Which of the following sentences is represented by the equation 

Possible Answers:

The absolute value of the sum of a number and seven is three greater than the number.

The sum of three and the absolute value of the sum of a number is three less than the number.

None of the other responses are correct.

The sum of three and the absolute value of the sum of a number is three greater than the number.

The absolute value of the sum of a number and seven is three less than the number.

Correct answer:

The absolute value of the sum of a number and seven is three less than the number.

Explanation:

 is the absolute value of , which in turn is the sum of a number and  seven and a number. Therefore,  can be written as "the absolute value of the sum of a number and seven". Since it is equal to , it is three less than the number, so the equation that corresponds to the sentence is 

"The absolute value of the sum of a number and seven is three less than the number."

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