Book Maths Puzzle Algebra

Graph the quadratic Function
f(x)=5-4x-x^2

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Your company has decided to bring out a new washer and dryer to compete in a small targeted market. The washer will sell for $400 and the dryer will sell for $300 each. If the to Two tanks contain equal amounts of water. They are connected by a pipe and 3000 litres of water is pumped from one tank to the other. One tank then contains 6 times as much water a