bacteria are growing exponentially in an environment of unlimited space and food. the doubling time is 1 hour. if there are initially milligrams of bacteria, express the mass of the bacteria as a function of time . x/70 use your answer to part (a) to complete the following equation whose solution is the time at which there are milligrams of bacteria. x/70*3 solve your equation from part (b) for the time at which there are milligrams of bacteria. hours your answer to part (c) should be between 1 and 2 hours. check that it is. do you understand why it has to be?