When solving an indefinite integral, what do you add to the end of your answer? Why?
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.
How do you find the concavity of a non-linear equation?
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.
When dealing with systems of equations, how many equations do you need if you have a problem with three unknown variables?
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.