A regular pentagon has an apothem of 3.2m and an area of 37.2m squared. What is the length of one side of the pentagon?
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The binomial expansion: 
a = 2y, b = 4 x^3, n = 4
( x )^3k = x^ 9
k = 3
Answer: the coefficient is 512.
a = 2y, b = 4 x^3, n = 4
( x )^3k = x^ 9
k = 3
Answer: the coefficient is 512.