Please help with right answers xoxo

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

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

What is y-5=3(x+1) in slope intercept form