Cheryl is going to investigate if the amount of vinegar added to baking soda affects the amount of carbon dioxide gas produced when they are mixed together. She gets four flasks that are the same size. She adds 25 mL of vinegar to the first flask, 50 mL of vinegar to the second flask, 75 mL of vinegar to the third flask, and 100 mL vinegar to the fourth flask. She attaches a balloon filled with 15 g of baking soda to the top of each flask. She tips the balloons to add the baking soda to the vinegar and then measures the size (diameter) of each balloon after 1 minute. What is Cheryl's IV? What is Cheryl's DV? What are three constants in Cheryl's experiment? What is a possible hypothesis for Cheryl's experiment?