An overweight man goes on a diet. He initially weighs 269 pounds. He has set a target weight of 200 pounds. Each month the difference D, in pounds, between his current weight and his target weight decreases by 5%.
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A: Find a formula that gives his weight difference D after t months on the diet.
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B: If W, in pounds, is his weight after t months, then his weight difference is 
. Find a formula that gives his weight after t months on the diet.
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C: When will he weigh 223 pounds? Round your answer to two decimal places if necessary.
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What will be an ideal response?
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B: 
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C: After 21.42 months
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