Which ordered pair is the solution to the system of equations? {y=3x−12 4x+6y=−6 (0, −12) (3, −3) (4, −7) (6, −5)

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%)