# SAT Math Word Problems: Functions

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

- 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 - 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

**The correct answer is Choice (D).**

Plug 24 in for*w*and simplify the equation:

**The correct answer is 6.**

According to the table,*f*(5) = 6. Therefore,