exam Maths Puzzle Numerical Ability

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.

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exam Other Question

I need to find the equation of the horizontal asymptote(s) for g(x)= (e^x) - 5 and
the equation of the horizontal asymptote(s) for h(x)= -e^x 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