The binomial expansion:

a = 2y, b = 4 x^3, n = 4
( x )^3k = x^ 9
k = 3


Answer: the coefficient is
512.
Step-by-step explanation:
1\5 ÷3/7=7/15
3/7 multiply by 7/15=1/5
1/2 I guess I don't think you typed in the question correctly. Not trying to be mean.