an overweight man makes lifestyle changes in order to lose weight. his starting weight is 280 pounds and he has set a target weight of 200 pounds. let t be the time in months and let d be the difference in pounds between his weight at time t and his target weight. each month the difference d decreased by 15 %.
a make an exponential model of d versus the time t in months since the diet began
b How long will it take for his weight to reach 215 pounds?
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