The expression below represents the number of bacteria in a petri dish after t hours. 57(1.31)^t interpret the meaning of the expression. a. the initial number of bacteria is 131, and the growth rate is 5.7% per hour. b. the initial number of bacteria is 57, and the growth rate is 31% per hour. c. the initial number of bacteria is 131, and the growth rate is 57% per hour. d. the initial number of bacteria is 57, and the growth rate is 3.1% per hour.