Apainter charges $15.92 per hour, plus an additional amount for the supplies. if he made $191.76 on a job where he worked 7 hours, how much did the supplies cost?

Asap! i'm not good math and i'm lost.

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?