Write a number that has 724 in the ones. and 628 in the thousand.

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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

If a seller prepaid the taxes of $4,400 and the closing is set for may 19, using the 12 month/30 day method what will the buyer owe the seller as prorated taxes?