W(x) = 0.07x+4.1 models the number of women, w(x) , in millions, enrolled in u. s. colleges x years after 1984. the function
m(x)= 0.01x+3.9
models the number of men, m(x), in millions, enrolled in u. s. colleges x years after 1984.

Unfortunately, you missed to identify what is the unknown in the problem or what we are to solve here. However, it may be that in this problem we are asked to explain the equations. These mean that x years after 1984, more women were enrolled in U.S. colleges because of the greater slope for the equation for women than in men's. 

The correct answer is 7