Question

some years ago, Marcus planted a 7-foot tree in his front yard. The tree grew 3 feet each year. Now the tree is four times the original height.

How many years ago did Marcus plant the tree?
9 years ago because 7*4=28, and 28/3 is 9.
Ms. Sue
No, Cece.

4 * 7 = 28

28 - 7 = 21

21/3 = ?

height = 3x + 7 , where x is the number of years

when is 3x+7 = 28 ?
3x = 21
x = 7

It will take 7 years to grow to 28 ft

check:
now -- 7
after 1 year -- 10
2years -- 13
3 years --16
4 years -- 19
5 years -- 22
6 years -- 25
7 years -- 28

Related Questions

a tree grew at a 3 degree slant from the vertical. at a point 60 feet from the tree, the angle of el... Jen Planted a 7 ft tee, tree grows 3 ft each year. Now tree is 4times original height. How many yea... At a point on the ground 15 feet from the base of a tree the distance to the top of the tree is 1 fo... Mister more planted a tree in his backyard his tree with three and one third feet over 5 years if hi...