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                    This video explains the situation we are trying…                 | 
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                    This shows how to enter a value into a function…                 | 
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                    Shows how to plug in the given x--values and get…                 | 
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                    This shows how to decide whether you are seeking…                 | 
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                    This shows how to find the vertex of a parabola…                 | 
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                    This gives a graph of a parabola which is the…                 | 
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                    Shows how to find out what values are not defined…                 | 
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                    For an equation with f(x) equal to a rational…                 | 
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                    Demonstates how to interpret a graph of a system…                 | 
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                    Shows how thits form is simply the same as y = mx…                 | 
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                    Just showiing  how to  locate and write down the …                 | 
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                    Simply demonstrates how to interpret function…                 | 
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                    Describes a situation that can be written as a…                 | 
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                    Shows how to input an expression in place of the…                 | 
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                    Speaks to the meaning of f(x), i.e. function…                 | 
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                    Describes how to find output values for a…                 |