5 A scientist began a study with a sample of 1,500 bacteria. He noticed that the number of bacteria in the sample after 1 days can be modeled by the equationP = 1,500.5'. In this equation, what does 5 represent?

Mary and roberto bought identical backpacks at different stores. mary's backpack originally cost $65 and was discounted 25%. roberto's backpack originally cost $75 and was on sale for 30% off on the original price. which backpack was the better buy?