Tell me if my answer is correct. and if its not tell me the answer

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

Use the given information to determine the exact trigonometric value.

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?