What is the factored form of x2 – x-22
(x-2)(x + 1)
(x + 2)(x + 1)
(x - 2)(x - 1)
(x + 2)(x - 1)

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%)