Question

the relationship between the number of text messages sent and the monthly bill from a cell phone provider, can be described with a function. identify the independent variable and the dependent variable in this function. independent variable: blank dependent variable: blank describe the function with a sentence of the form blank is a function of blank. options: the number of text messages sent; the monthly cost of the cell phone

Explanation:

Step1: Identify Independent Variable

The independent variable is the one that is controlled or changed. Here, the number of text messages sent is the independent variable as it can vary freely, and the monthly bill depends on it.
Independent variable: the number of text messages sent

Step2: Identify Dependent Variable

The dependent variable depends on the independent variable. The monthly cost (bill) of the cell phone depends on the number of text messages sent, so it's the dependent variable.
Dependent variable: the monthly cost of the cell phone

Step3: Describe the Function

Using the form " [dependent] is a function of [independent] ", we substitute the variables. So the monthly cost of the cell phone is a function of the number of text messages sent.

Answer:

Independent variable: the number of text messages sent
Dependent variable: the monthly cost of the cell phone
Function description: the monthly cost of the cell phone is a function of the number of text messages sent