Each month, the owner of Fays Tanning Salon records in a data files the monthly total sales

Question:

Each month, the owner of Fay’s Tanning Salon records in a data files the monthly total sales receipts and the amount spent that month on advertising.
a. Identify the two variables.
b. For each variable, indicate whether it is quantitative or categorical.
c. Identify the response variable and the explanatory variable.