Question

i got the answer to this question wrong
A scientist counts 35 bacteria present in a culture and finds that the number of bacteria triples each hour. The function y = 35 • 3x models the number of bacteria after x hours.

Graph the function. (You do not need to submit the graph).

Use the graph to estimate when there will be about 550 bacteria in the culture.

Answer 1

it was my answer

y= 35 . 3^x (35 is the initial number of bacteria)

y= 35 . 3^(1) (substitute when x=1, so that u can graph it)

y=105 when x=1 (these r the points which u r goin to plot in the graph)



then



y=35.3^x (substite when x=2)

y = 35 * 3^2

y = 35 * 9 = 315

Answer 2

whats wrong with my answer

Answer 3

you need to estimate when there will be about 550 bacteria in the culture.
so, put y= 550
550 = 35. 3^x

Answer 4

you first drew the graph, right ?

Answer 5

those 2 points you calculated are correct.

Answer 6

that would be 15.58

Answer 7

15.58 for what ? x ? no....

Answer 8

my teacher commented this
You are trying to use the equation to estimate. You need to use the graph.
I would suggest using a graphing utility. Find the desired y-value on the graph and determine what the corresponding x-value is.

Answer 9

for x=15.58

Answer 10

yeah, thats why i asked whether you drew the graph ?you

Answer 11

i did but iam getting confused

Answer 12

no, not for x=15.58,
you see y=550 ON GRAPH, and find corresponding x co-ordinate

Answer 13

for that you need graph first.

Answer 14

can you tell me the equation s first

Answer 15

there are no equations....
you need to graph y= 35 * 3^x
using a graphing utility.
then locate y= 550 point on that.
do you have any graphing utility with you ?

Answer 16

no

Answer 17

neither do i have. when you have one, try this problem again.