Find s(20) for the sequence s(n)=5n-2,ne {1 2, 3,... }

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

The trigonometric ratios sine and secant are reciprocals of each other

Benjamin is making bow ties. how many 1/2yards lomg bow ties can he make if he has 18 feet of fabric?