Solve in a smart way no using calculators show your work (2^5 * 5^22 - 2 * 5 ^ 21) / 25^10.

Rosy waxes 2/3 of her car with 1/4 bottle of car wax.at this rate,what fraction of the bottle of car wax will rosey use to wax her entire car

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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? *