what type of annuity is this: Payments are made at the beginning of each month and the interest is 6% semi-monthly

Pls help ASAP

Linda and Casey have a $126 000 mortgage at 5.15% per year on their two-bedroom house. Determine thesemi-monthly payment on a mortgage amortized over 15 years.

A deposit is made every  half-year into a savings account paying 4% interest compounded semiannually. The balance after 4 years is $11,000. Calculate the rent of the increasing annuity.

A deposit is made every  half-year into a savings account paying 3% interest compounded semiannually. The balance after 7 years is $11,000.   Calculate the rent of the increasing annuity.

Find the future value of the given annuity:  Annuity due, $150 monthly payment, 6¼% interest, thirteen years. PLEASE SHOW WORK. THANKS!!!!!

You would like to have $25,000 set aside for your child’s college fund in 12 years by making regular,semiannual deposits in an annuity that pays 6% compounded quarterly. How much should you deposit at the end of every four months? Round to the nearest cent.