PLZ HELP I AM FAILING AND NEED HELP!!!!

Mathematics

1 answer:

MA_775_DIABLO [31]4 years ago

5 0

Answer: About 13% of the school would be in chess club.

Step-by-step explanation: Out of 85 students, 11 were in chess club. So:

11 / 85 = 0.1294117647, or approximately 13%.

If it's not too much to ask, may I have brainliest?

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Help please need to be done now

4vir4ik [10]

The radius of the new sphere is 9

The new SA should be 1017.36 in

New volume should be 3052.08in^3

4 0

3 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.

3 0

3 years ago

I need the answer pls reply

just olya [345]

Answer:

2 is the answer I did this once in class

4 0

2 years ago

2(3x-12)=6(x-2) PLEASE HELP!!!

Zarrin [17]

ANSWER: There are no solutions

6 0

3 years ago

I neeeddddfd helpppppppppp

erica [24]

Answer: A 4/16

Step-by-step explanation:

4/16 = 1/4

5/20 = 1/4

7 0

3 years ago

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