Thalia, a quiz show contestant, answered 20 questions. she was awarded 2 points for every correct answer that she gave, but she was penalized 1 point for every incorrect answer. in the end, thalia had a total of 28 points. in order to determine the number of correct and incorrect answers that she gave, a viewer at home used the system of linear equations x+y=20 and 2x+y=28

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.

In what organelle does photosynthesis take place?