1- A second-order homogenous differential equation 2- A third-order non-homogenous differential equation 3- An autonomous differential equation 4- A non-autonomous differential equation 5- A linear differential equation that can be solved using section 4.3 6- A linear differential equation that can be solved using section 4.7 - A second-order non-linear differential equation 8- A system of two differential equations 9- A solution of third-order homogenous differential equation 10- A solution of a fourth-order non-homogenous differential equation