Q$6$: Explain what a local variable is and why it cannot be accessed outside its function.

Q$7$: Create a global constant named DISCOUNT$\_$RATE with a value of $0\mathrm{.}1.$ Write two functions, calculate$\_$discount$($price$)$ and calculate$\_$final$\_$price$($price$).$ The calculate$\_$discount function should use DISCOUNT$\_$RATE to calculate the discount amount, while calculate$\_$final$\_$price should return the price after applying the discount. Test these functions with different values for price.

Q$8$: Write a function named square that takes a single parameter, num, and returns the square of that number. Then write a line of code to store and print the square of $8.$

Q$9$: Define a function named calculate$\_$average that takes three test scores as parameters and returns their average. Use this function to calculate the average of three different sets of test scores.

Custom Value$-$Returning Functions in Complex Expressions