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For what value of (y) is 3^3/3^y =1/9

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? *

The curved part of the figure is the semicircle what is the best approximation for the area of this figure