On a test that has a normal distribution, a score of 80 falls three standard deviations above the mean, and a score of 56 falls one standard deviation below the mean. Determine the mean of this test.

The measure of angle 0 is 600 degrees

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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? *