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ivolga24 [154]
2 years ago
13

There are 2,100 bacteria in a circular petri dish. The dish has a radius of 40 millimeters. What is the approximate population d

ensity? (Use 3. 14 for π) Area of a circle = πr2 0. 02 bacteria per square millimeter 0. 42 bacteria per square millimeter 2. 39 bacteria per square millimeter 52. 5 bacteria per square millimeter.
Mathematics
1 answer:
Tems11 [23]2 years ago
6 0

Answer:

B) 0.42

Step-by-step explanation:

population density=number of people/square units

we plug in 2,100 for the first one but we don't know the second one for that we need the area which is A=πr^{2} so the radius is 40 millimeters so 40^{2} =1600 1600*π=5024

2,100/5024=0.417 round it up and it is 0.42

so B) 0.42 is the answer

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Step-by-step explanation:

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2 years ago
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Darina [25.2K]

Answer:

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Step-by-step explanation:

2x - 5y = 7

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Rewrite top equation. Multiply both sides of bottom equation by -5. Add equations. This eliminates y, and we solve for x.

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Divide both sides by -13.

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Answer: x = -4; y = -3

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3 years ago
Alex was thinking of a number. Alex subtracts 14 from it and gets an answer of 29.6. What was the original number?
vekshin1
29.6 + 14 = 43.6
43.6 - 14 = 29.6

Hope this helped!
4 0
3 years ago
Shawna reduced the size of a rectangle to a height of a rectangle to a height of 2 in. what is the new width if it was originall
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