Why can't i get the answer to this problem

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left

Will give brainliestbased on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m?

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?