Acloset is in the shape of a right rectangular prism. it measures 414 ft long, 314 ft wide, and 6 ft tall. what is the volume of the closet?

How do i do this activity, is appreciated

I’m really confused and need to learn this

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment