Please? Help me asap

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Will mark brainliest if you answer ! the taco shop sold 198 lunches friday. this number is 3 more than 3 times the number they sold monday. let n represent the number of lunches sold monday. which equation shows an equality between two different ways of expressing the number of lunches sold on friday? a. n – 3 = 198 b. 3n – 3 = 198 c. 3n + 3 = 198 d. n + 3 = 198

Closing a credit card usually _your debt ratio.a. increasesb. decreasesc. improvesd. has no effect on