Question

18.) The cost of textbooks for a school increases with the average class size. Identify the independent and dependent quantity in the situation.
a.) number of classes; average class size


b.) cost; number of classes


c.) average class size; cost


d.) cost; average class size

Answer 1

The independent quantity is the average class size and the dependent quantity is the cost ⇒ c

Step-by-step explanation:

Lets revise the meaning of dependent and independent variables

• The dependent variable is the one that depends on the value of some other number
• The dependent variable is the output value and the independent variable is the input value
• Ex: if y = 2x + 3, x is the input and y is the out put, then is independent variable and y is dependent variable

∵ The cost of the textbook increases with the average class size

- The cost of the textbooks depends on the average of the

  class size

∴ The input is the average class size

∴ The output is the cost of the textbooks

∵ The input variable is independent variable

∵ The output variable is dependent variable

∴ The average of the class size is independent

∴ The cost of the textbooks is dependent

The independent quantity is the average class size and the dependent quantity is the cost

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