Question

a tree is now 12 feet tall and grows 18 inches a year. In how many years will the tree be 36 feet tall?

Answer 1

Answer:

16 years

Step-by-step explanation:

tree = 12ft

+ 18in /year

First we have to convert 18 inches to feet

1 ft = 12 in

18 in x (1 ft / 12 in) = 18/12 = 1.5 ft

so the tree grows 1.5 feet per year.

Now we can write an equation for this problem:

y = 12 + 1.5x

We want to know how many years it will take for the tree to be 36 feet tall. In order to do that we would input 36 for y:

36 = 12 + 1.5x

36 - 12 = 12 -12 + 1.5x

24 = 1.5x

24/1.5 = 1.5/1.5 x

x = 16

It will take 16 years for the tree to be 36 feet tall.