Final answer:
What-if analysis is the study of the impact on other variables when one variable is changed repeatedly.
Step-by-step explanation:
The subject of this question is what-if analysis. What-if analysis is a technique used in mathematics and other fields to study the impact on other variables when one variable is changed repeatedly. It allows researchers to simulate various scenarios and evaluate the outcomes based on the changes in the independent variable. This analysis helps in understanding the relationship between variables and predicting different outcomes.