Question: Steve is in the midst of his Microbe experiment. He is growing mold on a piece of peach. After 5 days in the baggie, the mold covers 88 square millimeters of the peach surface. After nine days in the baggie the mold covers 120 square millimeters of the peach surface. What is the %change in the area of the mold growth? (Include a plus sign or a minus sign to indicate the direction of the change.)