Suppose you have a 200-gallon tank full of fresh water. A drain is opened that removes 3 gal/sec from the tank and, at the same moment, a valve is opened that lets in a 1% solution (a 1% concentration) of chlorine at a slower rate of 2 gal/sec. A.) When is the tank half full and what is the concentration of the chlorine then? B.) If the drain is closed when the tank is half full and the tank is allowed to fill, what will be the final concentration of chlorine in the tank?

A student is concerned with the amount of air pollution students are exposed to in the school's parking lot after school. The student conducts an investigation to compare the quantity of particulate matter released from the diesel-powered buses, natural gas-powered buses, and the large and small cars as they idle waiting to pick up students. To make measurements, a small piece of white fabric is used to collect particulate matter from the tailpipe of each vehicle as it idles for five minutes. Each piece of fabric is then analyzed to measure the amount of particulate matter it collected. (i) Identify the independent variable in the investigation. (j) Identify one variable that was not mentioned in the description that could affect the results of the investigation. (k) Describe a realistic alternate sampling method to collect particulate matter from the vehicles in the investigation. (1) The student wants to ensure that the results are reliable. Explain how the student could modify the…

Which equation shows how to determine the volume of this aquarium? 3 16 inches 12 inches 1 24 inches 3 1 3 A. 24 +12 +16–=42 in В. 24 +12 + 16-=53- in 4 24x12x16 :12측 x 16 D.24x 12x 10-5.07 in 3 x12 x16- = 5,077 =D308 in O D.24 3. 4 8.

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