In Problems 55-66, express your answer as a linear inequality with appropriate nonnegative restrictions and draw its graph.
Fertilizer. A farmer wants to use two brands of fertilizer for his corn crop. Brand
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(A) How many pounds of each brand of fertilizer should he add to each acre if he wants to add at least
(B) How many pounds of each brand of fertilizer should be add to each acre if he wants to add at most
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