A rectangle has an area of 72 square units. The width of the rectangle is 9 units. The length of the rectangle is 2x + 4.

What is the rectangle's length?

6
7
8
9

Question

A rectangle has an area of 72 square units. The width of the rectangle is 9 units. The length of the rectangle is 2x + 4. 

What is the rectangle's length?



6
7
8
9

phi · Answer

what is the formula for the area of a rectangle ?

anonymous · Answer

lenth over width?

phi · Answer

Length * width = area

you know width, and you know area.  if you put in the numbers what do you get ?

anonymous · Answer

8

phi · Answer

L * W = A

replace W with 9  and A with 72 to get
L*9 = 72

divide both sides by 9
L*9/9 = 72/9

L = 8