Shelley earned 20% more money in tips waitressing this week than last week. This week she earned $90.00 in tips waitressing. How much money did Shelley earn last week in tips?

110

step-by-step explanation:

based on the question i am guessing that it is a typo for abc

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be