The primitive function for
is given by it's indefinite integral.
To calculate it, recall:


Let's begin


To find the costant, we just need to use the fact that 

Therefore,

You need to give more info
Answer:
Each package of pen costs 2.5
Each package of marker costs 5
Step-by-step explanation:
Please refer to the attached image for explanations
Y = - 20x + 100
Slope is -20, y-intercept is 100.
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