Anybody know how i can change my age and user name on my account? 10 pts

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 side of a square is 3 and 5/2 inches

Look at the figure xyz in the coordinate plane. find the perimeter of the figure rounded to the nearest tenth.