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boyakko [2]
4 years ago
12

HELP me ASAP i need help

Mathematics
1 answer:
irinina [24]4 years ago
3 0

Answer:

sin 39 = BS / 500

0.629320391 * 500 = BS

BS = 314.6601955 feet

ie. h = 314.66 feet

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torisob [31]

Answer:

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Step-by-step explanation:

hope this helps.

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son4ous [18]
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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

N(t)=N_0\left(\frac{1}{2} \right)^{ \frac{t}{t_{\frac{1}{2}} }

Therefore, the number of years it will take for 18% of the original tritinum to remain is given by

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>
5 0
3 years ago
Graph the function y=-|x|+9
MakcuM [25]

Answer:

Graph is attached :)

Step-by-step explanation:

Hope that helps!

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