If two circles are concentric then

Mathematics

2 answers:

Eduardwww [97]3 years ago

8 0

two circles are concentric when they will have the same centre

Romashka [77]3 years ago

3 0

B)they will have the same center

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3 years ago

Find the center and radius of the circle 3 x squared plus 3 y squared plus 6 y equals 03x2+3y2+6y=0.

denis23 [38]

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3 years ago

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Assume you have such a watch. if a minimum of 18.0% of the original tritium is needed to read the dial in dark places, for how m

laila [671]

Given that the half life of 3H is 12.3 years.

The amount of substance left of a radioactive substance with half life of $t_{ \frac{1}{2} }$ after t years is given by

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$18 \% = 100 \% \left(\frac{1}{2} \right)^{ \frac{t}{12.3}} \\ \\ \Rightarrow\left(\frac{1}{2} \right)^{ \frac{t}{12.3}} =0.18 \\ \\ \Rightarrow\frac{t}{12.3}\ln\left(\frac{1}{2} \right)=\ln0.18 \\ \\ \Rightarrow\frac{t}{12.3}= \frac{\ln0.18}{\ln\left(\frac{1}{2} \right)} = \frac{-1.715}{-0.6931} =2.474\\ \\ \Rightarrow t=2.474(12.3)=30.4$

Therefore, the number of <span>years that the time could be read at night is 30.4 years.</span>

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3 years ago

The product of a number y and 3 is 6

Solnce55 [7]

Answer:

y = 2

Step-by-step explanation

$3y=6$