The equation y = 2.125(1.249)^x models the number of online payment transactions a system completed each year from 2013 through 2020. In this equation, y is the annual payment transactions (in billions), and x represents the number of years after 2013. a. Estimate the annual number of online payment transactions in 2020. b. Assuming this equation continues to be valid in the future, use the equation to predict the annual number of the system's transactions in 2030. a. The annual number of online payment transactions in 2020 was about ___ billion transactions. (Round to the nearest tenth as needed.)
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