Write a multiplication expression that has a product of 7^15

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

Find the sum of the following series. round to the nearest hundredth if necessary.

On a piece of paper, graph . then determine which answer choice matches the graph you drew