Answers2026 Summer 305 Edgenuity CR_Grade 8 Pre-Algebra_MathComparing Functions in the Real WorldQuestion 9
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Comparing Functions in the Real World

Question 9 • 2026 Summer 305 Edgenuity CR_Grade 8 Pre-Algebra_Math

Four plumbers each charge a flat fee plus an hourly rate for repair visits. The table shows their total costs for repairs that required various amounts of time.Total Cost of RepairsHours needed for repairCost for plumberACost for plumberBCost for plumberCCost for plumberD1$35$55$50$502$65$75$75$603$95$95$100$70Which plumber charges the greatest hourly rate?

Answer
A
plumber A
B
plumber B
C
plumber C
D
plumber D

Explanation

Compare how much each plumber’s cost increases for each additional hour. Plumber A’s cost rises from $35 to $65 to $95, an increase of $30 per hour, which is greater than B’s $20, C’s $25, and D’s $10 per hour. Therefore, plumber A charges the greatest hourly rate.

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