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Question 13 (a) 

A biochemical reaction in which a substance is both produced and consumed is described by the differential equation
where denotes the concentration of the substance, is a constant and
the units are omitted.
(a) Which term represents the production rate and which term represents the consumption rate? Production: Consumption: 
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? 
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

When the substance is produced, the rate of change is positive (and vice versa). 
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Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. Following the Hint, the production rate is represented by the positive term, which is . Similarly, the consumption rate is represented by . Answer: Production: . Consumption: . 