exam Maths Puzzle Numerical Ability

For this question, we must find the revenue from the sale of x items given by R=50x. Does this ask to graph the equation only or do I need to solve this for x. And if so, how do I do it?

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exam Other Question
1)Graph f(x)=(x^2 - 4)/(x - 2) using a graphing calculator. Using a standard window with the trace feature, trace the graph to x=2. What happens?

Why is there a "break" in the 5 2 8
x y z
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-3
(xy)