Which function is represented by the graph? Of(x) = -2]x+ 1
O f(x) = - {1x1 + 1
O f(x) = -2|x + 11
O f(x) = - {\x + 11

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%)