see the figure below to better understand the problem
we have that

<h2>The answer is 357.0 feet</h2>
Step-by-step explanation:
1st term =4×2(1-1)=0
2nd term=4×2(2-1)=8
3rd term=4×2(3-1)=16
4th term=4×2(4-1)=24
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First question is 1.40 because i read the question wrong
my sister said its 75p