Question

the width of a rectangle is 6ft. find the perimeter of the rectangle if it's area is 42 square feet.

Answer 1

A=l x w
substitute
42=l x 6
  7=l
 Perimeter of a rectangle is  2l +2w
2(6)+ 2(7)
 12+14=26ft is the perimeter

Hope this helps

Answer 2

Formula: Area = length * width
Substitute in what you know: 42 = length * 6
Divide both sides by 6 to get the length: length = 7

Formula: Perimeter = 2 (length + width)
Substitute in what you know: P= 2 (7+6)
Solve: Perimeter = 26 ft