Can someone help me out with this?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

What does independent variable and dependent variable mean in math?

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters