Help pls for brainlest and extra points i need done soon

Ill mark the brainliest if you me with the these three questions 7,8,9

What is the product? a-3/15a × 5/a-3

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