Stefan left school and traveled toward his friend's house. eugene left two hours later traveling at 40 km/h in an effort to catch up to stefan. after traveling for three hours eugene finally caught up. what was stefan's average speed?

step-by-step explanation:

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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