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# Tutor profile: Ricky G.

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Ricky G.
Mechanical Engineering Student
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## Questions

### Subject:Calculus

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Question:

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Ricky G.

You add a C to the end of your expression because it accounts for a potential constant that may have turned to zero, whenever the derivative of the equation was taken.

### Subject:Calculus

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Question:

How do you find the concavity of a non-linear equation?

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Ricky G.

To find the concavity of a graph you need to use the second derivative test. Then you use a sign chart and check the second derivative around the inflection points that you find by setting the second derivative to equal zero. If you find a positive number after checking the answer, you know that it is concave up. If you find a negative number, you know that it is concave down.

### Subject:Algebra

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Question:

When dealing with systems of equations, how many equations do you need if you have a problem with three unknown variables?

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Ricky G.

You would need at least three equations. This is based off a general rule that says that you need to have as many equations as you do variables.

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