7
QuizMultiple Choice

Business Expenses — Quiz

Question 7 • Financial Math

A small cleaning service has the following details: - The cost to clean each house is $⁢5.00 - The fixed costs are $⁢30.00 - The total expense function is given by E⁡(q)=30+5⁢q , where q is the number of houses cleaned and E⁡(q) is the total expense. Given the expense function E⁡(q)=30+5⁢q , which graph correctly represents the relationship between the number of houses cleaned q and the total expenses E⁡(q) ?

Answer
A
Image with description A line chart. The x-axis is labeled from 0 to 10 and the y-axis is labeled from 0 to 140. The y-axis is E(q). A line goes upward through points (0, 20), (4, 40), (8, 60), and (10, 70).
B
Image with description A line chart. The x-axis is labeled from 0 to 10 and the y-axis is labeled from 0 to 140. The y-axis is E(q). A line goes upward through points (0, 20), (2, 40), (4, 60), (6, 80), (8, 100), and (10, 120).
C
Image with description A line chart. The x-axis is labeled from 0 to 10 and the y-axis is labeled from 0 to 140. The y-axis is E(q). A line goes upward through points (0, 30), (3, 60), (5, 80), (7, 100), (9, 120), and (10, 130).
D
Image with description A line chart. The x-axis is labeled from 0 to 10 and the y-axis is labeled from 0 to 140. The y-axis is E(q). A line goes upward through points (0, 30), (2, 40), (6, 60), and (10, 80).

Explanation

The function E(q) = 30 + 5q has a starting expense of $30 when q = 0 and increases by $5 for each house cleaned. For example, at q = 3, E(3) = $45, and at q = 10, E(10) = $80. Choice C starts at $30 but its listed points do not follow the function; choice D includes (0, 30) and (10, 80), but its other points do not. Therefore none of the described graphs exactly represents the function.

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