What is the value of the expression 4?​

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

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?