For the following mixed stream of cash flows, determine the future value at the end of the final year if deposits are made at the beginning of each...

I am really not understanding how to find the future values. I really need some help. This is homework for my Finance class.

For the following mixed stream of cash flows, determine the future value at the end of the final year if deposits are made at the beginning of each year into an account paying annual interest of 8%,assuming no withdrawals are made during the period.Cash FlowYearStream20,0008,700GO N7,600Cash FlowYearStream120,0008,7007,600Future Value ($) =(Round to the nearest cent.)