What is the area pleazsnhelp right answer

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

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? *