A bank account grows by 7% each year. By what percentage does it grow each month? (Round your answer to two decimal places.) A certain population grows by 20% per decade. What is its percentage growth each year? (Round your answer to two decimal places.) A certain population declines by 3% each year. What is the percentage decline each month? (Round your answer to two decimal places.)
A bank account grows by 7% each year. By what percentage does it grow each month? (Round your answer to two decimal places.)
A certain population grows by 20% per decade. What is its percentage growth each year? (Round your answer to two decimal places.)
A certain population declines by 3% each year. What is the percentage decline each month? (Round your answer to two decimal places.)
An investment declines in value by 4% each month. By what percentage does its value decline in a year? (Round your answer to two decimal places.)
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An overweight man makes lifestyle changes in order to lose weight. His starting weight is 240 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 decreases by 10%.
(a) Make an exponential model of D versus the time t in months since the diet began. D(T) = 40 x 0.9^t
(b) How long will it take for his weight to reach 215 pounds? (Round your answer to two decimal places.)
*wrong answer 4.47 months
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