9:
determine whether the ratios given in the first column are equivalent or not.
ratios
yes
no
117 and 7763
35 and 4575
18 and 1080
29 and 1881

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%)