Can you explain the answers and how to find them and for the vertex don't find it using vertex form.

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.

What is the value of r of the geometric series?

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits