Use a basic fact and a pattern to find the product 5,000 x 80

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

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9