a diagonal walkway cuts through a park bordered by two parallel streets. the parks department plans to add an additional walkway
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Answer:
Step-by-step explanation:
The nth term of the sequence is
To get the first term, substitute n=1,
To get the second term, substitute n=2,
To get the third term, substitute n=3,
The sum of the first three terms is
We could also use the formula
to get the same result.