Manny has a credit card with a line of credit at $4,000. he made the following purchases: $425.36, $358.33, $377.11, and $90.20. what is manny's available credit?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible