Question

A rectangle has a width of 5 yd and a length of 9 yd.

How does the area change when each dimension is multiplied by 4?

The area is increased by a factor of 2.
The area is increased by a factor of 4.
The area is increased by a factor 8.
The area is increased by a factor 16.

Answer 1

5 x 9 gives us the original area
= 45
When multiplied by 4:
(5x4)x(9x4)
20 x 36
= 720
720 divided by 45 = 16
The answer is D