If a Person Breathes in and Out Every 3 Seconds

Multiple Choice

If a person breathes in and out every 3 seconds, the volume of air in their lungs can be modeled by

, where A is in liters of air and x is in seconds. How many seconds into the cycle is the volume of air equal to 2.50 liters?

A) 1.75 seconds
B) 2.75 seconds
C) 6.91 seconds
D) no solution