Question

The amount of bacteria in a Petri dish increases at a rate proportional to the amount present. At time t=0, the amount of bacteria in the dish is 10 grams. At time t=2, the amount of the bacteria in the dish is 30 grams. What is the amount of bacteria in the dish at time t=6?
A. 70 grams
B. 190 grams
C. 270 grams
D. 9270 grams

Answer 1

Answer:

C. 270 grams

Step-by-step explanation:

-The growth of bacteria follows an exponential distribution expressed as:

$P_t=P_oe^{rt}$

Where:

• t=time
• $r$=rate of growth

• $P_o$ is the initial size and'
• $P_t$ is the size at time t

Given the size at time t and time zero, we substitute in the function to calculate the rate of growth r:

$30=10e^{2r}\\\\3=e^{2r}\\\\r=\frac{In \ 3}{2}\\\\=0.54931$

#we use the calculated rate of growth to determine time at t=6:

$P_t=10e^{6\times 0.54931}\\\\\\=270.00625\approx 270\ grams$

Hence, the bacteria's size at t=6 is 270 grams