40x 60 = 2400. so the area could be 2400.
The answer is (x+7)(x-4)
hence, the solution should be C
The product is the result of multiplying, and whatever number is multiplied by 3 is the amount of times you add 3 to the answer.
Example:
3x7= 3+3+3+3+3+3+3=21
You essentially have four triangles. The area of a triangle is: A=bh/2 (b=base length and h=height)
So the area is simply the sum of the four triangle areas...
A=(3*2)/2+(3*2)/2+(7*2)/2+(7*2)/2
A=20 ft^2
