Which of the following is equivalent to 4x - 3y = 15? A Oy= 2 - 5
B. Oy= 4x+5
C. Oy= 4x +15
D. Oy= x - 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%)