Question

Jack bought a tree to plant in his front yard. The tree grows at an approximate rate of 9 inches per year. After 4 years the tree is at 5 feet tall. Write an equation in slope intercept form to find the hight (in feet) of the tree, y, after x years. Then, find the number of years it will take the tree to reach 20 feet

Answer 1

Answer:

y = 0.75x + 2 ft

x = 24 yrs

Step-by-step explanation:

slope is (9/12) = 0.75 ft/yr

Y intercept is original height of tree 5 - 4(0.75) = 2 ft

y = 0.75x + 2

20 = 0.75x + 2

18 = 0.75x

x = 24 yrs