The sum of two numbers is 47. twice the first number and three times the second number have a sum of 100. Set up a system of equations to find the numbers

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.

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Ineed with math stuff it involves graphs