Write a ratio equivalent to 30/45 that has lower terms.(which one is right, ! )
a. 6/15 d.45/39
b.31/46 e.10/9
c.10/15 f.29/44

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?