Help me out please right awnsers only

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Solve the triangle. a = 21°, c = 105°, c = 5

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? *