Question

A piece of construction paper has a thickness of 4.3 x 10-3 inches. A piece of cardstock has thickness of 5.2 x 10-3 inches. How tall is a stack of 15 sheets of construction paper and 20 sheets of cardstock? Write your answer in scientific notation.

Answer 1

1.685·10^-1 inches

Explanation:

To find the total thickness, multiply the thickness of each sheet by the number of sheets and add the values for the different kinds of sheets:

(15)(4.3·10^-3) +(20)(5.2·10^-3) = (64.5 +104.0)·10^-3 = 168.5·10^-3

= 1.685·10^-1 . . . inches