Expressions in One Variable Pre-Test
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Alexis bought x boxes of cereal for $3 each, including tax, and paid with a $20 bill. Which expression represents the
total amount of change she should receive?
20 - 3x
O (3-20)
3x - 20
(20 - 3)

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?