3 years ago

I need help finding the are of this

Mathematics

1 answer:

Allisa [31]3 years ago

3 0

Answer:

78.5

Step-by-step explanation:

3.14*5*5=78.5

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Which set of points represents a function?

Aloiza [94]

A is the answer because it does not repeat any of the x numbers

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3 years ago

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>

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3 years ago

John has $20.43 dollars in his pocket. He buys a tv for $15.39 dollars. How many dollars does John have left?

AleksAgata [21]

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Mike owns a deli. He orders the deli meats listed in the table. Which deli meat is the most expensive per pound? Need Step by St

UkoKoshka [18]

Answer:

Im trying to say the same thing

Step-by-step explanation: