Tell whether each graph is a function and justify your answer. Which graph is not a good representation of a real-world situation? Explain.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64