All categories

3 years ago

21.2 is 54500 of what number?

Mathematics

1 answer:

bogdanovich [222]3 years ago

3 0

21.2 (21.2) is (=) 54500 (54500) of (times) what number (?)

21.2=54500 times ?
divide oth sides by 54500
21.2/54500=?

You might be interested in

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:

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

Step-by-step explanation:

Exponential Decay Function

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

Pls need to know ASAP

zzz [600]

Answer:

-31

Step-by-step explanation:

-34 - -17 is actually -34 + 17, so you get -17. -17 - 14 = -31

3 0

3 years ago

2 plus 4 multiplied by negative 6 minus 3 multiplied by 5

Monica [59]

$2\text{ + 4}\cdot(-6)\text{ - 3}\cdot5\text{ = 2 -24 - 15 = 2 - 39 = -37}$

6 0

2 years ago

Which fraction is equivalent? 1/6 5/30 6/30

gogolik [260]

1/6 and 5/30 are equivalent. They are equivalent because is you divide 5/30 by 5, you will get 1/6.
Hope this helps!

8 0

4 years ago

Read 2 more answers

A meteorologist reports that the ration of snowfall in January to total snowfall during the average winter is 2 to 5. If 34 inch

Zepler [3.9K]

Answer:

13.6 inches.

Step-by-step explanation:

First do 2/5 = x/34, then multiply 34 by 2 and you get 68, then 68 divided by 5 is 13.6!

Hope this helped!

4 0

3 years ago