Can someone please explain..

Find the future values of these ordinary annuities. Compounding occurs once a year. Do not round intermediate calculations. Round your answers to the nearest cent. a. $1,000 per year for 14 years at 8%. b. $500 per year for 7 years at 4%. c. $300 per year for 7 years at 0%. d. Rework parts a,b, and c assuming they are annuities due. Future value of $1,000 per year for 14 years at 8% : $ Future value of $500 per year for 7 years at 4% : $ Future value of $300 per year for 7 years at 0% : $