HELP! A box is 70 cm long. Which of these is closest to the length of this box in feet? (1 inch = 2.54 cm)

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

(least common multiples) the answer that i had in the 1st step was lcm of airline tickets sold=72. idk if that even matters but just in case. ! three co-workers are busy selling airline tickets over the phone. in an 8-hour day, charles can sell 8 airline tickets, ann can sell 9 airline tickets, and michelle can sell 6 airline tickets. step 2 of 2: what is the smallest number of 8-hour days needed for each of them to achieve the same number of sales? it takes charles . it takes . it takes .

Which expression is not a polynomial?