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Mathematics

1 answer:

boyakko [2]3 years ago

8 0

Answer:

b and c i think

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50% of what number is 32?

andriy [413]

So you know 50% means half right? So then do 32*2 and you get 64.

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2 years ago

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Does anyone else have to do i-Ready

julsineya [31]

Answer:

Step-by-step explanation:

Does anyone have to do DELTA-MATH

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1/7 rounded to the nearest thousand

Semmy [17]

1/7 = 0.14285714
rounded to the nearest thousandth, it would be 0.143

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2 years ago

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 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, the maximum age of a fossil that we could date using 40k is 12.5 billion years.

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3 years ago

Howto solve for x in X+10=30

Alla [95]

Answer:

Step-by-step explanation:

x+10=30

x=30-10

x=20

<h2>HOPE IT HELPED </h2>

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2 years ago

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