A plant is 15 cm high and grows 4.5 cm every month. How many months will it take until the plant is

A plant is 15 cm high and grows 4.5 cm every month. How many months will it take until the plant is 27.5 cm

We set up the height function H(m) where m is the number of months since now. We have:
H(m) = 4.5m + 15

We want to know when H(m) = 27.5, so we set our H(m) function equal to 27.5:
4.5m + 15 = 27.5

To solve for m, we type this equation into our search engine and we get:
m = 2.78

So we round up to 3 whole months