How many ounces are equal to 1 1/2 pounds

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?