Please help me solve this

If g(x) is an odd function, which function must be an even function?

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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? *