In the sentences you've provided, the italicized phrase "to reach her goal of buying a new bike" is placed differently, which influences the focus and clarity of the sentences.
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In the first sentence: "To reach her goal of buying a new bike, Marsha will need to save $10 each week."
- Here, the italicized phrase serves as an introductory element, setting the context for what follows. It clearly establishes that Marsha’s objective is buying a new bike, and the focus is on the action she needs to take (saving money) to achieve that goal.
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In the second sentence: "To reach her goal of buying a new bike each week, Marsha will need to save $10."
- In this case, the placement of the phrase makes it seem as if 'each week' modifies the goal of buying the bike, implying that Marsha's goal might be to buy a bike every week, which is likely an unintended interpretation. It shifts the emphasis slightly away from the act of saving money and confuses the timeframe related to the goal.
In summary, the placement of the italicized phrase changes how the sentence conveys Marsha’s intention and modifies the understanding of her saving strategy and the frequency of her goal. The first sentence makes the saving span clear and directly related to the goal of buying a single bike, while the second sentence introduces potential ambiguity.