A decision maker is considering including two additional variables into a regression model that has as the dependent variable, Total Sales. The first additional variable is the region of the country (North, South, East, or West) in which the company is located. The second variable is the type of business (Manufacturing, Financial, Information Services, or Other). Given this, how many additional variables will be incorporated into the model?

a. 9
b. 8
c. 6
d. 2

Option d.

Step-by-step explanation:

The aditional variables are:

Region of the country. (where the options are Noth, Sout, East or West)

Type of business (where the options are Manufacturing, Financial, Information Services, or Other)

Then we are only adding 2 aditional variables to the model, the correct option is d.

The following statements are true about exponential functions:
-The domain is all real numbers.
- The input to an exponential function is the exponent.
- The base represents the multiplicative rate of change.

The reason why the other two options are wrong are explained below:
The range of exponential functions is not always includes negative numbers; on the contrary, the range is the set of all positive real numbers.

The graph of an exponential function does not have a horizontal asymptote at x = 0; contrarily, the equation of the horizontal asymptote of the graph of is y = 0, which is the x-axis.