exam Maths Puzzle Numerical Ability

I am needing help one last time.

Identify the vertices and foci of the graph of the hyperbola

x^2/16 - y^2/16 = 1

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I have a homeowrk question that states: find the maximum revenue for the revenue function R(x)=490x-0.07x^2. How do I work this problem out? I have tried everything. How would I solve this?
Thank you

Evaluate fraction 2m-5n/n+3p if m = -2, n = 4, and p = -1.