Question 1086427
A nursery uses two brands of fertilizer for rose bushes. 
Brand A costs $3 per pound and provides 280 units of nutrients per pound. 
Brand B costs $4 per pound and provides 180 units of nutrients per pound. 
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The nursery spends $100 or less for fertilizer and wants to provide at least 5200 units of nutrients. 
Because brand B contains a special nutrient that brand A does not, the nursery uses at least 4 pounds of brand B. 
How many pounds of each should the nursery use to minimize cost?
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Cost Inequality:: 3A + 4B <= 100
Units Inequality: 280A + 180B >= 5200
Weight Inequality B >= 4
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Graph the inequalities; 
A <= -4B + 100
A >= -180B + 5200
B >= 4
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Identify the appropriate vertices.
Determine which coordinate pair minimizes cost.
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Cheers,
Stan H.
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