TEST BANK FOR A First Course in Differential Equations with Modeling Applications 9th, Differential Equations with Boundary Value Problems 7th By Dennis G. Zill

1. Second order; linear 2. Third order; nonlinear because of (dy/dx)4 3. Fourth order; linear 4. Second order; nonlinear bccausc of cos(r + u) 5. Second order; nonlinear because of (dy/dx)2 or 1 + (dy/dx)2 6. Second order: nonlinear bccausc of R~ 7. Third order: linear 8. Second order; nonlinear because of x2 9. Writing the differential equation in the form x(dy/dx) -f y2 = 1. we sec that it is nonlinear in y because of y2. However, writing it in the form (y2 — 1 )(dx/dy) + x = 0, we ...