Mark starts a rock climb when he is 1 mile above sea level. He can climb at the rate of 1.5 miles per hour. Which of the following functions would express Mark's height above sea level over time?
f( x ) = 1.5 x
f( x ) = 2.5 x
f( x ) = 1 + 1.5 x
The correct function that would express Mark's height above sea level over time is:
f( x ) = 1 + 1.5 x
This function represents Mark's initial height of 1 mile above sea level (1) plus his climbing rate of 1.5 miles per hour (1.5) multiplied by the time in hours (x).