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Is the demand elastic, inelastic or of unit elasticity at the indicated x-value?

Use a graphing utility to graph the revenue function, and identify the intervals of elasticity and inelasticity.

... I will list all information I can to help someone to help me to solve and understand the problem.

Demand Function = p = (500)/(x^2) + 5

x-value = 5

The following may be of help as well...

Definition of Price Elasticity of Demand - If p = f(x) is a differentiable function, then the price elasticity of demand is given by

N = (p/x)/(dp/dx)

where N is the lowercase Greek letter eta. For a given price, the demand is

**elast**

**ic**when abs(absolute) value N > 1, the demand is

**inelastic**when abs N < 1, and the demand has

**unit elasticity**when abs N = 1

Thanks in advance for any and all assistance on this Calculus problem

-mathkid3