Solve the given applied problems involving variation.The distance D that a spring is stretched by a hanging object varies directly as the weight W of the object. If a 28-kg object stretches a spring 83 cm, find the distance when the weight is 3-kg.
A. 23.25 cm
B. 1.012 cm
C. 114 cm
D. 8.89 cm
Answer: D
Mathematics
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Express the product as a sum or difference.cos 
cos 
A. 
(cos 6x - sin 5x)
B. 
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C. 
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D. 
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