hello can you please help me on my homework?

I already ask here in Coursehero but it seems not correct.

our lesson is about"solving problems involving annuity"

I am stuck here in number 6-8.

I tried answering 6 and 7 but i am sure that's not correct.

Can you please check it out? the number 6 and 7?

also in number 8 question.

I uploaded my work in my drive.

https://drive.google.com/folderview?id=1q6LkpKAdQJXqhTCpMpXAhxQ9L5ZnALo5

the questions:

III. General Annuity

6.

How much money is accumulated if Php 1.250 is paid at the end of the month for 4 years at 6.5% compounded quarterly?

7. Find the present value of an annuity due of P10.000 payable quarterly for 10 years if money is worth 6% compounded semi-annually.

8. What is the present value of a general ordinary annuity of P4,200 quarter for 10 years if money is worth 9% compounded semi-annually.