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# Differentiability

Those friendly functions that don't contain breaks, bends or cusps are "differentiable". Take their derivative, or just infer some facts about them from the Mean Value Theorem.

Above shows the graph of \(f(x) = | x| \), what is the value of \(f'(0) \)?

If instead, you use two cups, one that you always use to fill the coffee machine with water, and a second that you always use to collect the coffee, you can limit the number of coffee cups you have to use in total to two.

**Question**: Which of the following functions describes your fractional savings in the total number of coffee cups you've had to use as a function of \(c\), the number of cups of coffee you've made?

**True or false?**:

"There exists a number that is exactly one more than its cube."

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