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PtichkaEL [24]
3 years ago
14

Radium 226, which had been used for cancer treatment, decays with a half-life of 1622 years. suppose there is a 6 gram sample of

radium 226. How long will it take to have 1.5 grams remaining?
Mathematics
1 answer:
sveticcg [70]3 years ago
3 0
This is a relatively simple half life calculation.
To go from 6 to 3 grams, 1622 years is required.
3 to 1.5 grams another 1622 years is required.
So, it undergoes exactly 2 half-lives or 3,244 years.
To see more about half-life click here:
http://www.1728.org/halflife.htm



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$3.50 for 1/2 pound of cheese whats the cost for 1 pound
jeka57 [31]

Answer:

7 dollars

Step-by-step explanation:

Because 1/2 a pound is half of 1 pound and 3.50 is the value of half that pound, you can add 3.50 to 3.50 to get 7 dollars which is the value for 1 pound

6 0
3 years ago
Find the missing dimension of the cylinder. Round your answer to the nearest whole number.
irakobra [83]

Answer:

8 cm

Step-by-step explanation:

volume of a cylinder is v=pi x r^2 x h

substitute in what we know

3785= pi x r^2 x 19

3785=59.69 x r^2

subtract 59.69 from both sides

3725.31=r^2

square root of 3725.31

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square root of 61

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6 0
2 years ago
A cable car travels at a constant speed of 60 feet per minute for a part of its route. At this speed, how long will it take to t
Semmy [17]
1 yard= 6 foot
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3 0
3 years ago
Norman purchased $420 of stock in Carnival Cruise Lines last week. That stock is now worth $525. Use your knowledge of percent c
zysi [14]

Answer:

The stock Norman purchased increased in its value by 25%.

Step-by-step explanation:

Original Value of the stock = $ 420

New(Current) value of the stock = $ 525

We have to find the percentage change in the value of stock. The formula to calculate the percentage change is:

\text{Percentage Change}=\frac{\text{New Value - Original Value}}{\text{Original Value}} \times 100\%

Substituting the given values into this formula results in:

\text{Percentage Change}=\frac{525-420}{420} \times 100\% \\\\ \text{Percentage Change}=\frac{105}{420} \times 100\%\\\\ \text{Percentage Change}=0.25 \times 100\% \\\\ \text{Percentage Change}=25 \%

A positive value of Percentage Change indicates a growth. This means that the stock Norman purchased increased in its value by 25%.

7 0
3 years ago
431x3 <br> What is the answer
Furkat [3]

Answer:

1,293

Step-by-step explanation:

431 + 431 + 431 = 1,293

Or, 431 * 3 = 1,293

This can be confirmed, because 1,293 divided by 3 is 431, and 1,293 - 431 - 431 is 431.

Hope this helps! :D

4 0
2 years ago
Read 2 more answers
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