ASAP please, arc and angle measures

If 3x+8=3x+8 is it one solution or no solution

What does independent variable and dependent variable mean in math?

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? *