Someone please help me pleaseee

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

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? *

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?