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Which of the following situations does not represent a proportional relationship?


a. Emilia earns $8.75 an hour and a 10% commission on any new memberships she sells.

b. Tatum is flying a remote-controlled airplane at a speed of 18 miles per hour.

c. Phoebe is at a baseball game where they sell all drinks for $1.75 each.

d. All of the above are proportional.