Find the equivalent future value at year 7 of an annuity from year 4 to year 6 with an annuity amount of $200 per year at an annual rate of 8%?

Find the equivalent present value at time 0 of a series of cash flows starting from year 1, at $1,000 that year, to year 20, with cash flow amount decreases $40 per year at an annual rate of 8%?