Question

The number of bacteria in a sample increased by a factor of 2 every minute from 9:05 AM to 9:55 AM. The function below shows the number of bacteria in the sample f(x) after x minutes from 9:05 AM.

f(x) = 10(2)x

Which of the following is a reasonable domain for the function?

0 ≤ x ≤ 10

5 ≤ x ≤ 55

0 ≤ x ≤ 50

All positive integers

Answer 1

@phi

Answer 2

@@ganeshie8

Answer 3

@ganeshie8

Answer 4

you should use ^ to show exponents. Otherwise it is hard to guess what the equation is.

Is it
f(x) = 10(2^x)
?

Answer 5

yes

Answer 6

@phi

Answer 7

The function below shows the number of bacteria in the sample f(x) after x minutes from 9:05 AM

the domain is the x values that you can use.
what is the smallest x you can use... in other words, what is the smallest number of minutes from 9:05 AM ? any idea ?

Answer 8

9:06

Answer 9

what about 9:05 ? in other words, we don't wait any time at all, and x=0 ?

Answer 10

so its the first answer

Answer 11

you need to now the last x number... it says
from 9:05 AM to 9:55 AM.
how many minutes is 9:55 from 9:05 ?

Answer 12

50

Answer 13

so the smallest x is 0 and the biggest x is 50 (if we go x=51, we go past 9:55 and that is not allowed for this problem)

which choice shows x from 0 to 50 ?

Answer 14

so its the third one

Answer 15

yes, it is
0 ≤ x ≤ 50

Answer 16

thanks

Answer 17

Can you figure this one out on your own? That is the important part... being able to think.

Answer 18

i kinda of get
@phi