Question

The height of a rectangle is multiplied by 4. Which of the following describes the effect of this change on the area?

The area is multiplied by 16.
The area is multiplied by 8.
The area is multiplied by 4.
The area is multiplied by 2.

Answer 1

Choice 3. The area is multiplied by 4.

Answer 2

Area is multiplied by 4.

Explanation:

The area of rectangle with dimensions h and l are h*l.

If we multiply the height,h, by 4 we get the dimensions are 4h and l, and so the new area would be (4h)*l or 4hl or 4(hl). So the area would be 4 times as much as it was before.