Prove: An odd times an odd equals an odd.
(2m + 1)(2n + 1) = [ ? ]mn + ]m +[ ]n + [ ]
= 2([ ]mn + m + 1 + 1
= odd

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? *