Practice!

Sample Problem

Before the start of professional soccer games, the balls must be inflated to a pressure of 13 psi with an absolute error of 0.5 psi. Find the minimum and maximum acceptable air pressures for soccer balls.

Minimum: Maximum:

Solution

We can write an absolute value equation for this situation, then solve

|p – 13| = 0.5

p – 13 = 0.5 or p – 13 = -0.5

p = 13.5 or p = 12.5