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?
3 answers
9 years ago because 7*4=28, and 28/3 is 9.
No, Cece.
4 * 7 = 28
28 - 7 = 21
21/3 = ?
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
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
1 answer