Math

Given the function q=D(x)=k/x^n

where k is a positive constant and n is an integer greater than 0.

(a) How would you find the elasticity of the demand function
(b) Is the value of the elasticity dependent on the price per unit
c.) Does the total revenue have a maximum, and if so, when?

I've gotten so far as to find the der. is -knx^-n-1, but that might also not be the right derivative after all.

Thanks

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