The Multiplication Law of Exponents says that for any numbers b, n, and m, B^n. b^m=b^n+m
A. True
B. False

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)