Acolony of bacteria grows according to the uninhibited growth model. suppose there is 18 g of bacteria on monday and 54 g of bacteria on wednesday. (a) find a function that gives the amount of bacteria in grams after t days. (use the variable a to represent the initial amount.) a(t) = (b) what is the doubling time for the colony? (round your answer to 2 decimal places.)

a. The general form of equation of an uninhibited growth model is:

A = a e^kt

where A is final amount, a is initial amount, k is constant and t is time

From Monday to Wednesday, two days have passed so t = 2, therefore calculating for constant k:

54 = 18 e^k(2)

e^2k = 3

2k = ln 3

k = 0.55

So the function becomes:

A(t) = a e^0.55t

b. Finding for t when A = 2a

2a = a e^0.55 t

0.55 t = ln 2

t = 1.26 days

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2500

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