exam Maths Puzzle Numerical Ability

how do you use a graphing calculator??....
i know it is a very broad question but i need to know...

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exam Other Question

If f(-x) = -f(x) for all choices of x, then what does that tell you about the function f?
Give an example of a function that has this property f(-x) = -f(x) for all real numbers x.
You need to purchase a textbook for nursing school. The book cost $80.00, and the sales tax where you are purchasing the book is 8.25%. You have $100. How much change will you receive back?