An arch in the firm of a semicircle was over a 40 inch wide doorway. Find the length of the arch.

Which of the following questions is a statistical question? (2 points) how many professional sport leagues are there? where do the professional sport leagues play? how many hours of professional training took place over the weekend? how many hours do you spend each week training for a sports league?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Which expression is equal to (21)(7)(3x) using the associative property? (21 · 7 · 3)x (7)(21)(3x) 32(7 + 3x) (3x)(7)(21)