Question

The width of a box is x units.

The height of a box is 3 units.

The length of a box is (x + 10) units.

Which expression represents the volume of the box, in cubic units, when x > 0?

Answer 1

3x² + 30x

Explanation:

width of a box = x units.

height of a box = 3 units.

length of a box = (x + 10) units.

Volume of the box = length × width × height

= (x + 10) * x * 3

= (x + 10) * 3x

= 3x² + 30x

Volume of the box = 3x² + 30x