Acontractor digs a hole for the basement of a new house that is 40 feet long and 10 1/2 feet deep what is the width of the hole if 6510 ft.³ of dirt are removed

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

Which of the following is a solution of z^6 = 64i? 2(cos105° + isin105°) 2(cos120° + isin120°) 2(cos135° + isin135°) 8(cos15° + isin15°)

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.