Wind has blown sand over a platform such that the intensity of the load can be approximated

Question:

Wind has blown sand over a platform such that the intensity of the load can be approximated by the function w = w0(x/d) 3, simplify this distributed loading to an equivalent resultant force and specify the magnitude and location of the force, measured from A.
Units Used:
kN = 103N
Given:
w0 = 500N/m
d = 10 m
w(x) = wo(x/d)3

Wind has blown sand over a platform such that the