Plz just fill in blanks and you don't need to show work. tysm!

According to the normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)