Question

A tree was 9 feet tall. One year later, the tree was 16 feet tall. Write an equation and use mental math to find how many feet f the tree grew.

Answer 1

7 ft

Explanation:

let the height height of the tree be "h"

Hence the tree's height h=9 ft

one year later,let the height of the tree increased by x ft

hence

`9 + x = 16` --------This is the equation for the growth of the tree

In order to solve for the added height(growth) of the tree we need to solve for x

`9 + x = 16\\x=16-9\\x=7ft`