Selena planted a tree that is 46.5 ft tall if it grows 4 inches each year how long will it take to real a height of 74.5

Answer 1

great question! looks like a good proportionality question. It’s already 46.5 ft and they want it to reach 74.5ft. Let’s subtract those and see how much more it needs to grow.

74.5 - 46.5 = 28ft

its growing at the rate of 4 inches per yr. **** when dealing with rates, units of measure have to be the same. So we have to either work with inches or feet. Can’t be both. Let’s do inches. ***

4in/1yr = 336in/(x)

these are equal proportions so we just cross multiply and solve for (x).

4x = 336

x = 84 yrs

it will take 84 years for the tree to grow another 28ft.