Cumulative frequency table pls help

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? *

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

Simplify this expression. 8x 16(x + y)