Explanation
Correct answer: D.
Choice D is correct. It's given that at the beginning of the st week of the year there was $ in a savings account and Gabriella deposits $ in that savings account at the end of each week. Therefore, the amount of money, in dollars, in the savings account at the end of the th week of that year is , or .
Desmos solution:
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Why the other choices are wrong
Choice A
Choice A is incorrect. This is the amount of money, in dollars, that will be in the account at the end of the th week if Gabriella withdraws, rather than deposits, $ at the end of each week.
Choice B
Choice B is incorrect. This is the amount of money, in dollars, that will be in the account at the end of the st week, not the th week.
Choice C
Choice C is incorrect and may result from conceptual or calculation errors.
Student discussion
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