Question 15 (2 points) Solve the following differential equation dx t+ 6x dt t+6x+15 Select all the correct answers. O . z(t) = D) (412t + C t 13) where C is an arbitrary constant. 1 z(t) = 5 ( 15t + C t 25) where C is an arbitrary constant. 1 z(t) = 5 (+4v/ 30t + C t 15) where C is an arbitrary constant. | The ODE can be solved relying on the separation of variables method (separable form method). (| The ODE can be solved relying on the dx/dt=f(x/t) method