GED Mathematical Reasoning Test For Dummies
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If you run into a function problem on the GED Mathematical Reasoning test, you may be asked to either write a function based on a word problem, or to simply plug in values and evaluate the function.

The following practice questions ask you to do both.

Practice questions

  1. Diana's take-home pay is described by the function f(h) = 2,000h – 0.15 (2,000h). Evaluate f ($25).

  2. A car rental company charges $50 per day plus $0.40 per mile traveled. Write the function that represents the daily cost of the car rental.

Answers and explanations

  1. f ($25) = $42,500

    To solve this problem, insert $25 for h and do the math:

  2. f (m) = $50 + $0.40m

    In this problem, the variable is the number of miles traveled, so use m for miles. The charge is $50/day, so place that to the right of the equal sign, plus 40 cents for every mile traveled, or $0.40 per mile. You then have f (m) = $50 + $0.40m.

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Murray Shukyn, an acknowledged Canadian leader in alternative education, has taught at the elementary, secondary, and university levels and created adult training programs. Achim Krull has taught at high school and adult levels, and has written textbooks, teachers' guides, and numerous other learning materials.

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