The correct answer is C.88 ft ^2
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Answer:0.2352
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Step-by-step explanation:
Let the mass of the person be
.
Let the spring constant be
.
Let the displacement in spring be 
Let the acceleration due to gravity be 
As it is given that the person just stands,the forces are balanced.
So,
Given,


I think it is B
Hope this help you?????
I think you meant to type
4(n)-5=7.
4n = 7 + 5
4n = 12
n = 12/4
n = 3