Solve the problem by using a compound inequality. See Example 12.
Supply and demand. The function S = 20 + 0.1x gives the amount of oil in millions of barrels per day that will be supplied to a small country and the function D = 30 − 0.5x gives the demand for oil in millions of barrels per day, where x is the price of oil in dollars per barrel. The president worries if the supply is less than 22 million barrels per day or if demand is less than 15 million barrels per day. For what values of x does the president worry? Use interval notation.
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