Which type of machine learning should you use to predict the number of gift cards that will be sold next month? 

Answer options:

A. classification
B. regression
C. clustering

B

In the most basic sense, regression refers to prediction of a numeric target. Linear regression attempts to establish a linear relationship between one or more independent variables and a numeric outcome, or dependent variable. You use this module to define a linear regression method, and then train a model using a labeled dataset. The trained model can then be used to make predictions. Reference: https://docs.microsoft.com/en-us/azure/machine-learning/studio-module-reference/linear-regression