Answer:
0.0589 mile
Explanation:
311 feet divided by 5280 and you will get 0.0589 miles
If you were blacklisted during the Red Scare, you would not be able to find work in the entertainment industry.
<h3 /><h3>What was the Red Scare?</h3>
This was a time in the 1950s where people were increasingly worried that Communists had inflitrated America and were plotting a takeover.
When people were blacklisted for being involved in Communist activity, they would be unable to find employment in entertainment as people wanted to avoid their bad publicity.
Find out more on the Red Scare at brainly.com/question/3724882
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<h3>
Answer:</h3>
60 days
<h3>
Explanation:</h3>
Half-life is the amount of time it takes half of a substance to decay away.
Guess and Check
One method for solving half-life problems like this is to guess and check. To do this, we can continue to divide 475mg by 2 until we get to 30mg.
- 475 ÷ 2 = 237.5
- 237.5 ÷ 2 = 118.75
- 118.75 ÷ 2 = 59.375
- 59.375 ÷ 2 = 29.6875
As seen here, it takes approximately 4 half-lives for this sample of Ra-225 to decay to 30mg. Now, we can multiply 4 by the length of the half-life, 15 days.
Fractions
Another way to solve this is to use fractions.
- 16 is equivalent to .
This means that it takes 4 half-lives for 475mg to decay to 30mg. Using the same method above, we can tell that 4 half-lives are 60 days.
Important Note
In this question, I rounded occasionally. So, not all of the values are exact, but they are all very close.
When conducting research, scientists use the scientific method to collect measurable and first-hand evidence in an experiment related to a hypothesis. The results usually aim to support or contradict a theory.