6th grade math , help me please:)

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?