An author is selling autographed copies of his book at a bookstore for $25 each. He has brought 40 books with him to sell. If the function p(x) = 25x represents the profit the author will make for selling x number of books, what is the appropriate domain in this scenario?

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%)