Last day of school math help, pretty please? I'm dying here?

Anyone?
Added (1). 1.Stefani is purchasing a house and finances $410,350 of the purchase price. The mortgage is a 30-year 7/3 ARM at 6.5% with a 4/13 cap structure. What will the remaining balance be after the first seven years?

2. Maggie is financing $219,400 to purchase a house. How much money will she save over the life of a 15-year, fixed-rate loan by buying 2 points with a rate of 5.83% instead of not buying points with a rate of 6.28%? Round to the nearest dollar.

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