This is a BIOSTATISCTICS question. I need help with #6. It is on the last page of the attachment. Please view the other pages for better understanding. Thank you!

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

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48