<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.
The best way to complete the bulleted summary of the excerpt is; Listen to the sound they make
<h3>How to find the summary of an Excerpt?</h3>
An excerpt is a quoted fragment from a book, novel, poem, short story, article, speech, or other literary work that is used to give the reader a specific example of the exact language from the source. An excerpt in a sentence is signaled by quotation marks.
A summary is a short retelling of a longer written passage, containing the author's most important ideas. Summarizing helps improve both your reading and writing skills. To summarize, you must read a passage closely, finding the main ideas and supporting ideas.
From the excerpt adapted from What is That Bird by the US Fish and Wildlife Service, the three keys to identifying birds are:
- Note their physical characteristics
- Listen to the sound they make
- Listen to the sound they make is the correct option because the excerpt says that a bird can be identified just by its song or call, being able to take note of the tone, rhythm and repetition.
Read more about Summary of an Excerpt at; brainly.com/question/21400963
#SPJ1
Having a larger vote than smaller companies is not a main advantage for a business joining a cooperative.
<h2>What is a cooperative?</h2>
A cooperative is the voluntary union of natural or legal persons of a business with the purpose of creating a common organization for the production of a good or the provision of a service.
<h3>Advantages for a business joining a cooperative:</h3>
- The costs incurred by the company are shared by the partners, according to their capital contribution.
- They are managed democratically by their partners, participating in the decision process, in this way, a great consensus is achieved in the face of any challenge.
Therefore, we can conclude that a business joining a cooperative can have more resources and be more efficient and effective, obtaining profitability faster.
Learn more about advantages for a business joining a cooperative here: brainly.com/question/17643948
<u>ANSWER:</u>
The correct option is "The number of mice decreased".
<u>EXPLANATION:
</u>
It is clearly given in the question that the snakes depended on the mice for their survival. The snakes fed on the mice on the field. When the new method of grain spill was found, the mice could not find enough grain to eat and therefore they either left the field or died because of hunger.
`The reduced population of mice was not enough for the snakes which in turn either died or moved to another place for survival.
