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2 years ago

6

If you can solve all of these i will give you all of my points. geometry is the only thing i need help with and i am really stru

ggling please help

1 answer:

madreJ [45]2 years ago

4 0

Answer:

help you with what you have not put down the question so when you are ready to put down the question I am here waiting

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A fossil was analyzed and determined to have a carbon-14 level that is 80 % that of living organisms. the half-life of c-14 is 5

liq [111]

Answer:

The fossil is 1860 years old.

Step-by-step explanation:

The equation for the amount of fossil has the following format:

$Q(t) = Q(0)e^{rt}$

In which Q(t) is the amount after t years, Q(0) is the initial amount and r is the rate of change.

Half-life of c-14 is 5730 years.

This means that $Q(5730) = 0.5Q(0)$

So

$Q(t) = Q(0)e^{rt}$

$0.5Q(0) = Q(0)e^{5730r}$

$e^{5730r} = 0.5$

$\ln{e^{5730r}} = \ln{0.5}$

$5730r = \ln{0.5}$

$r = \frac{\ln{0.5}}{5730}$

$r = -0.00012$

So

$Q(t) = Q(0)e^{-0.00012t}$

How old is the fossil?

This is t for which

$Q(t) = 0.8Q(0)$

So

$Q(t) = Q(0)e^{-0.00012t}$

$0.8Q(0) = Q(0)e^{-0.00012t}$

$e^{-0.00012t} = 0.8$

$\ln{e^{-0.00012t}} = \ln{0.8}$

$-0.00012t = \ln{0.8}$

$t = -\frac{\ln{0.8}}{-0.00012}$

$t = 1860$

The fossil is 1860 years old.

4 0

3 years ago

Is it a b c or d!???????????????ksnsnsksnsjsksbdnsnddjdi

sergiy2304 [10]

Answer:

Correct amnswer is A

Step-by-step explanation:

5 0

2 years ago

Compare 3 + (–4) to (–4) + 3. What happens to the sum when the addends are reversed?

slamgirl [31]

The sum stays the same??? I’m pretty sure that’s the answer

6 0

3 years ago

Plz plz somebody help me i will mark you has brainlest pls its due at 8:00 its like 7:43

Crazy boy [7]

Answer: She is incorrect because 0 + 0 = <u>0</u>

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2 years ago

Draw 3 rows of 10 oranges.

statuscvo [17]

We cannot help you with that, sorry

8 0

2 years ago

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