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Scilla [17]
3 years ago
8

the population of a bacteria culture doubles in number every 12 minutes. the ratio of the number of bacteria at the end of 1 hou

r to the number of bacteria at the beginning of the hour is? ...?
Mathematics
2 answers:
maxonik [38]3 years ago
8 0
Let's say the number of bacteria you initially have is "a."  The number of bacteria doubles every twelve minutes, which means that it doubles 5 times in an hour.  You have(2)(2)(2)(2)(2)a=a∗2^5=32a at the end of the hour.  You started out with only a.  This means your ratio is 32a/a = 32.
Leviafan [203]3 years ago
3 0

Answer:

32

Step-by-step explanation:

Let X be the number of bacteria at the initial time.

At 12 minutes = 2 X

At 24 minutes = 4X

At 36 minutes = 8X

At 48 minutes = 16X

At 60 minutes = 32X

The ratio between the final and the initial instant will be: 32X / X = 32

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Mike traveled to Greensboro by car. Going there took 6 hours, and the return trip was four hours. Mike averaged a speed of 81 mi
Marat540 [252]

Answer: 64.8 mph

Step-by-step explanation:

Given

Arriving time is 6 hours

return time is 4 hours

The average speed of returning 81 mph

Distance traveled while returning

\Rightarrow d=81\times 4=324\ miles

the average speed of the entire trip is

\Rightarrow v_{avg}=\dfrac{2\times 324}{6+4}=\dfrac{648}{10}=64.8\ mph

4 0
2 years ago
The perimeter of the scalene triangle is 54.6 cm. Which equation can be used to find the value of b if side a measures 8.7 cm?
77julia77 [94]

A scalene triangle is a triangle that has 3 sides that are all different lengths.

Let these letters represent the problem:

a = 8.7

b = side 2

c = side 3

P = 54.6

To find the perimeter, we just need to add all the sides [ P = a + b + c ]

So, put what we have in the formula above.

54.6 = 8.7 + b + c

Best of Luck!

7 0
3 years ago
Read 2 more answers
How many times can can 93 go into 784?
lyudmila [28]
784/ 93 = 8.43010752688
93 * <span>8.43010752688 = 784</span>

8 0
3 years ago
Read 2 more answers
The James family went out to eat and their total bill was $110. Since the service was great, they will leave a 20% tip. How much
Kamila [148]

Answer:

$22

Step-by-step explanation:

20*110/100

=$22 is the amount

8 0
2 years ago
Read 2 more answers
PLEASE HELP 70 POINTS
k0ka [10]

Answer:

4a. About 54 times NOT INCLUDING THE FIRST TRIAL

4b. About 60 times NOT INCLUDING THE FIRST TRIAL

Step-by-step explanation:

I say about because we don't know if it's ALWAYS going to be the same results.

4a. Also 12*4 because it's 20 times so 20*4=80 then you add half of it to become 90 and you get 54

4b. 12*5 because 100/5=20 for the 20 trials of them

6 0
3 years ago
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