exam Maths Puzzle Numerical Ability

How do you test if something is a function on a graph? ......I remember my teacher saying something about using a pencil and lying it down on the graph, or something like that...please help!!!-I have a final TOMMMORROW!!!

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exam Other Question

A real estate agent received a 2% commission on the sale of a home. If the home sold for $761,000, how much was her commission?

i come up with .2X761,000 = $15220.00 am i heading in the right direction. For the function f(x)=x^2-8, construct and simplify the difference
quotient f(h+h)-f(x)/h
The difference quotient is=