SAT Math Word Problems: Functions - dummies

By Ron Woldoff

The SAT Math exam contains word problems that require you to be familiar with functions. Some questions, like the first practice question, will be a simple matter of plugging in a number. Others, like the second practice question, may be trickier than they appear.

Practice questions

  1. This equation is a model of projected fish population at a lake, where w represents the number of weeks and f(w) represents the approximate number of fish. According to the model, what is the projected number of fish at the end of the 24th week?
    A. 11
    B. 122
    C. 131
    D. 181
  2. The function f is defined by a polynomial. Some values of x and f(x) are shown in the table.
    What is the value of

Answers and explanations

  1. The correct answer is Choice (D).
    Plug 24 in for w and simplify the equation:
  2. The correct answer is 6.
    According to the table, f(5) = 6. Therefore,