$1)$

Complete the function definition to have a parameter named num$\_$grade.

def get$\_$letter$\_$grade$($

$)$:

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$2)$

Call a function named calc$\_$calories$()$ passing the value $21$ as an argument.

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$3)$

Is the following a valid function definition beginning? Type yes or no$.$

def my$\_$fct$($userNum $+5)$:

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$4)$

Assume a function def get$\_$birthday$\_$age$($user$\_$age$)$: simply returns the value of user$\_$age $+1.$ What will the following code output?

print$($get$\_$birthday$\_$age$(42),$ get$\_$birthday$\_$age$(20))$

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