Suppose that from 2020 to 2060, the number of females in the U.S. under the age of 18 (in millions) can be modeled by

N=0.15x+33.6 ,

where x is the number of years after 2020.

Interpret the meaning of the slope, 0.15 , in the context of this problem.

Every 33.6 years, the number of females in the U.S.under age 18 is predicted to increase by 0.15 million.

The number of females in the U.S. under age 18 is predicted to increase by 0.15 million per year.

Every 0.15 years, the number of females in the U.S.under age 18 is predicted to increase by 33.6 million.

The slope 0.15 represents the number of females in the U.S. under age 18 (in millions.)

The slope 0.15 represents the number of females in the U.S. under age 18 (in millions) 33.6 years after 2020.