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creativ13 [48]
3 years ago
7

Find the radius of a circle that has a circumference of 1671.

Mathematics
1 answer:
son4ous [18]3 years ago
8 0

Answer:

r=8

Step-by-step explanation:

Given formula:

r = C / 2π

It is given that C = 16π

hence

r = 16π / 2π = 8

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Krypton-91 is a radioactive substance that decays very quickly. The function Q(t)=Qoe^-kt models radioactive decay of krypton-91
Masteriza [31]
The "k" value should have units and should be negative.
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Half-Life = -.693147 / -.07
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(actually, wkpedia says half-life of Krypton 91 is 8.57 seconds)

elapsed time = half-life * log (bgng amt / end amt) / log (2)
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<span><span>elapsed time = 9.9 * 3.3219280949 </span>
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<span>elapsed time = 32.89 seconds (rounded)

Source:
http://www.1728.org/halflife.htm

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6 0
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What property does the equation 4+x+7=4+7+x
e-lub [12.9K]
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The equation of a circle is (x-1)^2 +(y-2)^2=4. What is the center of the circle and what is the radius of the circle?
Virty [35]

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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