Given the table below, determine if the data represents a linear or an exponential function and find a possible formula for the function. X 0 1 2 3 4 f (x) 12. 5 13. 75 15. 125 16. 638 18. 301 a. Exponential; y = 12. 5 (1. 10) Superscript x c. Exponential; y = 1. 10 (12. 5) Superscript x b. Linear; y = 1. 499x 12. 3648 d. Linear; 12. 3648x 1. 499.