What’s 5 plus 10 because I wasn’t very sure and a need it for my math homework

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

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