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kenny6666 [7]
4 years ago
10

In a lab, 180 cells are present at the beginning of an experiment. During the first 9 hours, the number of cells increased by 8%

each hour. Write an exponential model giving the number of cells y present t hours after starting the experiment. Estimate the time when the number of cells is 360.
Mathematics
1 answer:
jasenka [17]4 years ago
8 0

Answer:

The answer is 9 hours

Step-by-step explanation:

From the initial population of 180 cells, the number grows by 8% every hour for the first 9 hours.

This represents a increased population of 108% the previous population.

108% = 108/100 = 1.08

So the new population after n hours is

180 x 1.08^n

When population is 360

360 = 180 x 1.08^n

1.08^n = 2

Take log of both sides

n x Log1.08 = Log 2

n = Log 2/Log 1.08

n = 9

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Step-by-step explanation:

The equation of the circle with a center and a point

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( a, b) - the center of the circle

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b = 3

Step 1: substitute the center into the equation

( x - 2)^2 + ( y - 3)^2 = r^2

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Step 3: sub the radius into the equation

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( x - 2)^2 + ( y - 3)^2 = 34

Therefore, the equation of the circle is

( x - 2)^2 + ( y - 3)^2 = 34

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