Help please need answers ​

17 in long 1.3 ft wide and 8in high what is the volume

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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