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?

A.) f(x) = 1.5x
B.) f(x) = 1 + 1.5x
C.) f(x) = 2.5x

Question

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?

A.) f(x) = 1.5x
B.) f(x) = 1 + 1.5x
C.) f(x) = 2.5x

anonymous · Answer

B.
You have to add 1 to the distance travelled from 1 mile high.