Which expression is equivalent to 100n^2-1?
a. (10n)^2-(1)^2
b. (10n^2)^2-(1)^2
c. (50n)^2-(1)^2
d. (50n^2)^2-(1)^2

The unpaid balance on a mastercard charge was $1,056.23. during the month, payments of $300 and $250 were made and charges of $425 and $274.16 were added. if the finance charge is 1.2% per month on the unpaid balance, find the new balance at the end of the month. $1,205.39 $1,218.06 $918.06 $1,768.06