Can anyone explain how to do this? ?

Pls the last one and it has to be like number 6

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

Find the solution set for this equation: t^2+7t=0 separate the two values with a comma.