Chapter 1.3, Problem 3P

In each of Problems $1$ through $6$, determine the order of thegiven differential equation; also state whether the equation islinear or nonlinear.

$\frac{d^{4}y}{d{t}^4}+\frac{d^{3}y}{d{t}^3}+\frac{d^{2}y}{d{t}^2}+\frac{dy}{dt}+y=1$