Hello. I have posted this sheet three times. Does anyone know the answers? Thank You! It was due yesterday!!

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.

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

For the sequence [tex]a_{n} = 2n/(n+1)[/tex], what is the value of [tex]a_{10}[/tex]