Hello, asiankatt!

There is aformulafor these problems . . .

. . .

where: .

I'll do the third one for you.

For the others, we need to be told thenumber of years.

Find the amount of each ordinary annuity.

c. A payment of $2800 at the end of every 6 months for 5 years

with an interest rate of 9% per annum, compounded semi-annually.

We are given: .

Therefore: .