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2 years ago

3^2 is an example of

Mathematics

1 answer:

mr_godi [17]2 years ago

3 0

Answer:

B. A numerical expression

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The doubling period of a bacterial population is 20 20 minutes. At time t = 100 t=100 minutes, the bacterial population was 9000

Nuetrik [128]

Answer:

The initial population was 2810

The bacterial population after 5 hours will be 92335548

Step-by-step explanation:

The bacterial population growth formula is:

$P = P_0 \times e^{rt}$

where P is the population after time t, $P_0$ is the starting population, i.e. when t = 0, r is the rate of growth in % and t is time in hours

Data: The doubling period of a bacterial population is 20 minutes (1/3 hour). Replacing this information in the formula we get:

$2 P_0 = P_0 \times e^{r 1/3}$

$2 = e^{r \; 1/3}$

$ln 2 = r \; 1/3$

$ln 2 \times 3 = r$

$2.08 \% = r$

Data: At time t = 100 minutes (5/3 hours), the bacterial population was 90000. Replacing this information in the formula we get:

$90000 = P_0 \times e^{2.08 \; 5/3}$

$\frac{9000}{e^{2.08 \; 5/3}} = P_0$

$2810 = P_0$

Data: the initial population got above and t = 5 hours. Replacing this information in the formula we get:

$P = 2810 \times e^{2.08 \; 5}$

$P = 92335548$

3 0

2 years ago

If 9% of a number equals 10, find 90% of that number.

rodikova [14]

The answer is 100 % because it’s the same but with two zeros

5 0

3 years ago

Please help me with this question

valentinak56 [21]

Radius= 33
Diameter = 66
Circumference = 207 yards
Area= 3,421 yards squared
Hope that helped :D

8 0

3 years ago

5)<br> Solve for x.<br> 2x + 16 = 3(x - 9)<br> My Answer:

Vedmedyk [2.9K]

Answer:

Step-by-step explanation:

2x+16= 3(x-9)

2x+16= 3x-27

3x-2x^^

16= x-17

16+17

x= 33

8 0

3 years ago

Read 2 more answers

PLEASE HELPP FASSTTTTTT

lisabon 2012 [21]

Answer:

sorry, i dont um, im setting, the acc, up and ,20

3 0

3 years ago