Imogen bought number of invitations

Given the graphed function below which of the following orders pairs are found on the inverse function

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.