What is 108,208,930 in scientific notation?

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 ?