Identify the constant of proportionality from the table. X Y
3 21
5 35
6 42
8 56

O A. 3
O B. 21
C. 1/7
D. 7​

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%)