Can you please answer this question thank you

3. A culture of bacteria is growing at a rate of 499-5? per hour, with r in hours and 0 s r s 20. A. How many new bacteria will be in the culture after the first six hours? More Applications of Integrals B. How manlyr new bacteria are introduced from the end of the fifth hour through the fteenth hour? C. At approximately how many hours after r = IE] will the culture contain 200 new bacteria