The axis of symmetry of a parabola is a line that divides it into two similar halves and this axis always goes through the vertex.
To find the equation of the line that represents the symmetry of the curve, suppose a parabola of the form 
Then, deriving y with respect to x we have:

By matching dy / dx to 0 we have and by clearing x we have:

This equation allows us to find the axis of symmetry for any quadratic function
Then for the first function of the image.
The axis of symmetry is:


For the second function of the image:


For the third function the axis of symmetry is observed with the naked eye, is the line of equation:

If I understood correctly, I believe this is the answer.
9514 1404 393
Answer:
1/2 mL/min
Step-by-step explanation:

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<em>Additional comment</em>
The units analysis tells you how to work this problem. In order to get from mg/min to mL/min, you need to multiply by a factor with units mL/mg. Those units are the inverse of the concentration in mg/mL, which is found from g/mL.
<span>11:35 - 12:00 = 25 minutes
12:00 - 1:30 = 1 hour and 30 minutes
so </span>25 minutes + 1 hour and 30 minutes = 1 hour and 55 minutes
answer: 1 hour and 55 minutes
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