Harlow earns 4% simple interest on her savings account. Her initial
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The given equation is a Quadratic equation, so it's graph must be a parabola, and the Coefficient of x² is positive that means the parabola must have an opening upward.
And 2 is added to the ideal equation, so the parabola must have shift 2 units up from x - axis.
From the above information, we can easily conclude that the Correct representation is done in graph 4
Try the Pythagorean theorem, 
. Does 
? If it does, you have yourself a right triangle. If it doesn't, then it isn't a right triangle.