Logan D. answered 01/20/15
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Expert Teacher: Calculus, Differential Equations & Physics for Success
Linear - Straight line graph
Quadratic - Parabolic line graph
Square root - not sure if there's a name for it, but it's part of a family of functions called the "power functions" (axb), that have three main classifications of graphs (where b > 1, b < 0, 0 < b < 1).