Hi there!
a.
To find the total amount of people that have ENTERED by t = 20, we must take the integral of the appropriate function.

Evaluate using a calculator:

b.
To solve, we can find the total amount of people that have entered of the interval and subtract the total amount of people that have left from this value.
In other terms:

We can evaluate using a calculator (math-9 on T1-84):


c.
If:

Then:

Evaluate at t = 20:


This means that at t = 20, there is a <u>NET DECREASE</u> of people at the movie theater of around 20.823 (21) people per hour.
d.
To find the maximum, we must use the first-derivative test.
Set S(t) - R(t) equal to 0:

Graph the function with a graphing calculator and set the function equal to y = 0:
According to the graph, the graph of the first derivative changes from POSITIVE to NEGATIVE at t ≈ 17.78 hours, so there is a MAXIMUM at this value.
<u>Thus, at t = 17.78 hours, the amount of people at the movie theater is a MAXIMUM.</u>
Answer:
I think its the first one
Answer:
Mongols were given masterful training for every type of possibility so that they could react accordingly whenever it occurred.
Explanation:
The Mongols conquered Iran, Iraq, the Caucasus, and parts of Syria and Turkey, Palestine as far as Gaza in 1260 and 1300. Various strategies and techniques were used in the Mongol conquests of northern China and Persia. Mongols were given masterful training for every type of possibility so that they could react accordingly whenever it occurred. The Mongols also tried to protect their ranking officers.
The statement that would be correct is that Current total chlorine would decrease by half.
<h3>What is the presence of chlorine and bromine in the stratosphere?</h3>
The both in the stratosphere leads to Ozone Depletion this is because if chlorine and bromine atoms unit with ozone in the stratosphere, they tend to destroy ozone molecules.
Hence, The statement that would be correct is that Current total chlorine would decrease by half as it is the most valuable options among them.
Learn more about bromine from
brainly.com/question/23894494
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