What is the equilibrium solution for the differential equation dNdt=0.4(N−15)\frac{dN}{dt} = 0.4(N - 15)dtdN=0.4(N−15)?
N=0.4N = 0.4N=0.4
N=15N = 15N=15
N=−15N = -15N=−15
N=0N = 0N=0