Triangle ABC is translated according to the rule (x, y) - (x + 2, y - 8). If the coordinates of the pre-image of poir[ B are (4.-5), what are the coordinates of B'?

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%)