Answer:
a. 
b. 
Step-by-step explanation:
First, we need tot find a general expression for the amount of caffeine remaining in the body after certain time. As the problem states that every hour x percent of caffeine leaves the body, we must substract that percentage from the initial quantity of caffeine, by each hour passing. That expression would be:

Then, to find the amount of caffeine metabolized per hour, we need to differentiate the previous equation. Following the differentiation rules we get:

The rate is negative as it represents the amount of caffeine leaving the body at certain time.
Answer:
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Step-by-step explanation:
ur welcome ;)
Question 1132387: How many liters of a 10% solution should be mixed with 60L of 25% solution to get 15% solution? = one click in Excel = 120. ANSWER. 120 liters of the 10% solution.
Answer:
Muscles Gym: 13.33
Energy Gym: 15.00
Step-by-step explanation:
Muscles Gym: You divide "40.00" by "3", which will then give you the answer of "13.33".
Energy Gym: You divide "93.00" by "6", which will then give you the answer of "15.50".
You then add the zero to show the proper number of cents after the decimal point.
I hope this helps!