Josh has two rectangular prisms. the length of the second prism is 10 times the length of the first prism. the heights and widths of the two prisms are the same. which best describes the volume of the second prism?

The volume of the second prism is also en times than the volume of the first prism.

Let's assume that both prisms have:
width = 3 units
height = 4 units

Prism 1 length = 5 units
Prism 2 length = 50 units

Let's solve their respective volumes to compare...

Volume of prism 1 = length * width * height
                              = 5 * 3 * 4
                              = 60 units ^3

Volume of prism 2 = 50 * 3 * 4
                              = 600 units ^3

Prism 2/ prism 1 = 10
That means, prism 2 is ten times than the volume of prism 1.