I don't understand how to do these on the financial calculator, please help and please try to explain the steps to get there.

What is the required monthly payment on a $530,000 mortgage. Assume a standard mortgage (360 months) with monthly payments. Use a nominal rate of 6%. $3,177 $3,394 $2,976 $2,980 $3,079 Consider a standard mortgage (360 months) with monthly payments and a nominal rate of 6.80%. What portion of the payments during the first 31 months goes toward principal? 13.04% 13.51% 14.25% 15.51% 14.49%