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Function Evaluation, Rule of 4

Below are four functions, each using one of the function representations we've learned about in this lesson. Identify which of the functions are invalid

$\displaystyle {f{{\left({x}\right)}}}$
$\displaystyle {p}{\left({t}\right)}$
$\displaystyle {t}$ -13 -5 1 7 11 18 19 45 47 56

$\displaystyle {p}{\left({t}\right)}$ 39 63 18 79 49 53 111 20 108 21
$\displaystyle {g{{\left({x}\right)}}}$ : {(7,-9), (-5,8), (1,44), (7,76), (11,20), (18,38), (19,39), (45,14), (47,40), (56,12)}
The drink you are served at Starbucks is a function of what drink you order.

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