What are the real zeros of x3 + 4x2 − 9x − 36? A. 1, 2, 3 B. -6, 2, 3 C. –4, –3, 3 D. –1, 2, 18

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%)