Question

research shows that mount everest grows an average of 4 millimeters each year. how many years will it take to grow 720 millimeters?
a. 40
b. 100
c. 180
d. 720

Explanation:

Step1: Identify the relationship

We know the growth rate per year and the total growth. We use division.
Let $y$ be the number of years, growth rate $r = 4$ mm/year and total growth $G=720$ mm. The formula is $y=\frac{G}{r}$.

Step2: Calculate the number of years

Substitute $G = 720$ and $r = 4$ into the formula: $y=\frac{720}{4}=180$.

Answer:

C. 180