What uniform series of cash flows is equivalent to a $$100,000$ cash flow, ten years from now, if the uniform cash flows occur at the end of the year for the next ten years and the periodic interest rate is $11\%$ compounded annually?

What uniform series of cash flows is equivalent to a $$100,000$ cash flow, $15$ years from now, if the uniform cash flows occur at the end of the year for the next $15$ years and the periodic interest rate is $8\mathrm{.}5\%$ compounded annually?

What is the present value of five $$800$ cash flows that occur at the end of each year for the next five years at a periodic interest rate of $8\%$ compounded annually? The first cash flow occurs a year from now, the second cash flow occurs two years from now,..., and the fifth cash flow occurs five years from now.

What is the present value of twenty $$500$ cash flows that occur at the end of each year for the next $20$ years at a periodic interest rate of $7\mathrm{.}5\%$ compounded annually? The first cash flow occurs a year from now, the second cash flow occurs two years from now,..., and the twentieth cash flow occurs $20$ years from now.

What uniform series of cash flows is equivalent to a $$15,000$ cash flow occurring today if the uniform series of cash flows occur at the end of each year for the next five years and the periodic interest rate is $9\%$ compounded annually?