Experiment: 10 people are at rest and their blood pressure is taken using a blood pressure devise; then, you have these 10 people do 50 jumping jacks and re-measure their blood pressure. What is the dependent variable?

Antoine manages a number of apartment buildings that use natural gas for heating, cooking, and laundry. the scatter plot shows the correlation between the outside air temperature and antoine's natural gas bill. which type of correlation does the plot illustrate?