1.

To save on helium costs, a balllon is inflated with both helium and nitrogen gas. Between the two gases, the ballon can be inflated up to 8 liters in volume. The density of helium is 0.20 gram per liter, and the density of nitrogen is 1.30 grams per liter. The ballon must be filled so that the volumetric average density of the ballon is lower than that of air, which has a density of 1.20 grams per liter. Which if the following system of inequalities best describes how the ballon will be filled, if x represent the number in liters of helium and y represents the number of liters of nitrogen?

Answer»

`{(x+ygt8), (20x+130ygt120):}`
`{(x+y=8), ((0.2x+1.30y)/(2)lt1.20):}`
`{(x+y=47), (0.78x+1.07y=45.94):}`
`[(x+yle8), (0.20x+1.30ylt1.20):}`

ANSWER :C


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