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Nezavi [6.7K]
3 years ago
9

Two 2 1/2 inch plastic and two 5 1/3 inch plastic are used to from a rectangle.What is the perimeter of the rectangle

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

Answer:

15 2/3

Step-by-step explanation:

First, you have to change the denominators in the same number. They can both be changed to 6, so the new fractions will be 2 3/6 and 5 2/6. Multiply both numbers by 2, so now the equation is 5+10 2/3. Add.

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What is BC of the prism
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What is the value of x in the equation x – y = 30, when y = 15?
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X should be 45
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3 years ago
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Dinosaur fossils are often dated by using an element other than carbon, like potassium-40, that has a longer half life (in this
Firlakuza [10]
The amount of substance left of a radioactive element of half life, t_{\frac{1}{2}} after a time, t, is given by:

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

Given that <span>potassium-40 has a half life of approximately 1.25 billion years.

The number of years it will take for 0.1% of potassium-40 to remain is obtained as follows:

0.1=100\left( \frac{1}{2} \right)^ \frac{t}{1.25}} \\  \\ \Rightarrow\left( \frac{1}{2} \right)^ \frac{t}{1.25}}=0.001 \\  \\ \Rightarrow\frac{t}{1.25}\ln\left( \frac{1}{2} \right)=\ln(0.001) \\  \\ \Rightarrow \frac{t}{1.25}= \frac{\ln(0.001)}{\ln\left( \frac{1}{2} \right)} =9.966 \\  \\ t=9.966(1.25)=12.5

Therefore, </span><span>the maximum age of a fossil that we could date using 40k is 12.5 billion years.</span>
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3 years ago
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