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Ne4ueva [31]
3 years ago
5

Can you find the area

Mathematics
2 answers:
yaroslaw [1]3 years ago
7 0
Area = 45 + 90
Answer: 135
baherus [9]3 years ago
7 0
First find the bigger rectangles area by doing 10 x 9 the area of that section is 90. The other part subtract 9 from 18 to get 9. Multiply 9 and 5 to get 45. add 45 and 90 to get the final answer 135
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Carbon-14 is a radioactive isotope that has a half-life of 5,730 years. Approximately how many years will it take for carbon-14
PilotLPTM [1.2K]

Answer:

<em>Carbon-14 will take 19,035 years to decay to 10 percent.</em>

Step-by-step explanation:

<u>Exponential Decay Function</u>

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay.

An exponential decay can be described by the following formula:

N(t)=N_{0}e^{-\lambda t}

Where:

No  = The quantity of the substance that will decay.

N(t) = The quantity that still remains and has not yet decayed after a time t

\lambda     = The decay constant.

One important parameter related to radioactive decay is the half-life:

\displaystyle t_{1/2}=\frac {\ln(2)}{\lambda }

If we know the value of the half-life, we can calculate the decay constant:

\displaystyle \lambda=\frac {\ln(2)}{ t_{1/2}}

Carbon-14 has a half-life of 5,730 years, thus:

\displaystyle \lambda=\frac {\ln(2)}{ 5,730}

\lambda=0.00012097

The equation of the remaining quantity of Carbon-14 is:

N(t)=N_{0}e^{-0.00012097\cdot t}

We need to calculate the time required for the original amout to reach 10%, thus N(t)=0.10No

0.10N_o=N_{0}e^{-0.00012097\cdot t}

Simplifying:

0.10=e^{-0.00012097\cdot t}

Taking logarithms:

ln 0.10=-0.00012097\cdot t

Solving for t:

\displaystyle t=\frac{log 0.10}{-0.00012097}

t\approx 19,035\ years

Carbon-14 will take 19,035 years to decay to 10 percent.

6 0
3 years ago
Read 2 more answers
I will mark brainliest to whoever has the best answer
gogolik [260]

Answer:

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Step-by-step explanation:

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Oxana [17]

Answer:

Infinity

Step-by-step explanation:

1+1=5

2+2=22 =

infinity

6 0
2 years ago
Two angle measures in a triangle are 47 degrees and 43 degrees. what type of triangle is it?
Maslowich
Take 180 subtract 47 and 43.  You get 90.  So it would be C. 
3 0
3 years ago
aleka has a box for keepsakes that has a volume of 576 cubic inches the length of the box is 12 in and the width is 8 in what is
Vikki [24]
We know that
volume of the box=length*width*height
V=L*W*H----> H=V/[L*W]
V=576 in³
L=12 in
W=8 in
so
H=576/[12*8]----> H=6 in

the answer is
the height of the box is 6 in 
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3 years ago
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