Please help and explain please

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? *

What is the graph of the absolute value equation ? y=|x|-5

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities