4. A culture starts with 10000 bacteria, and the number doubles every 40 minutes. a. Find a function that models the number of bacteria at time t. b. Find the number of bacterial after one hour.c....

4. A culture starts with 10000 bacteria, and the number doubles every 40 minutes. a. Find a function that models the number of bacteria at time t. b. Find the number of bacterial after one hour. c. After how many minutes will there be (50000) bacteria? d. Sketch a graph of the number of bacterial at time t.