Algebra test so please don’t answer unless you know you’re right.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

To decrease an amount by 16% what single multiplier would you use

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%)