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Total Cost Equations

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1. Allen bought 20 stamps at the post office in 37¢ and 20¢ denominations. If the total cost of the stamps was $7.06, how many 37¢ stamps did Allen buy?

2. The profit on a watch is given by P = x2 - 5x - 9 and where x is the number of watches sold per day. How many watches were sold on a day when there was a $15 loss?

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The expert examines the total cost equations.

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(1) Let x be the number of 37 cent stamps. Then there are 20 - x stamps of 20 ...

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