Could you please help explaining the way for me calculate these answers?

Present Value Computations Assuming that money is worth 0%. compute the present value of Round answers to the nearest whole number. '|. $?.000 received 15 years from today. $ 2. The right to inherit $1.000.00014 years from now. it 3. The right to receive $1.000 at the end of each of the next six years. is 4. The obligation to pay $3,000 at the end of each of the next 10 years. 15 5. The right to receive $5.000 at the end of the Tth. 3th. 9th, and 10th years from today. $