Final answer:
A payment of $100 a quarter for 10 years represents an annuity, as it is a series of regular equal payments over a specified time period.
Step-by-step explanation:
A payment of $100 a quarter for 10 years does indeed fit the definition of an annuity. An annuity is a series of equal payments made at regular intervals over a specified period. Since the payments in this case ($100) are made quarterly (every three months), and this happens for a duration of 10 years, it meets the criteria of an annuity which is a financial product that results in regular disbursements to the holder over time.
An example of an annuity in real life would be a car lease, where the lessee makes regular monthly payments for a fixed number of months.