A rectangle has dimensions in feet as shown in the figure it is 2x +5

And one side is 8. I need to write an expression for the area of the rectangle.

B. Find the area of the rectangle, in sq.ft. if x=3

C. Find the value of x if the area of the rectangle is 160 square feet.

2 answers

The area is length * width:
(2x+5)(8) = 16x+40

Use that in B, and then solve for x if 16x+40 = 160
(2x+5)(8)=16x+40 or 4x+4x+4x+4x+5(8)

x=3 then solve for x if 16x+40=160