exam Maths Puzzle Numerical Ability

Can you please take the time to help me solve this problem: Find the average rate of change of f(x) = 2 x2 - 3 x, when x changes from 1 to 2, and then find the equation of the seca

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exam Other Question

Let f(x) be any function and O(x) = [f(x) - f(-x)]/2 . Show that O(x) is odd. This question is really giving me a hard time. I would love it if someone could please help me. The total profit (in dollars) for sales of x rowing machines is given by P(x) = 0.2 x^2 + 300x - 200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum?