The number of bacteria in a culture is increasing according to the law of exponential growth. after 9 hours there are 125 bacteria, and after 21 hours there are 1000 bacteria. (a) how many bacteria were there after 19 hours? (b) about how long does it take for this population to double? check your proposed doubling time by walk-through.

Write an inequality and solve each problem. for exercises 11 and 12, interpret the solution.

15/16 as a decimal rounded to the nearest hundredth

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b. you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c. you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d. you spend $5 plus $10 per week until you have less than $45.