[15] Using LaPlace transforms, obtain the impulse response of the systems characterized by the following differential equations \text { a. } \quad \frac{d^{2} y(t)}{d t^{2}}+2 \frac{d y(t)}{d t}+y(t)=x(t) \text {

b. } \frac{d y(t)}{d t}+5 y(t)=\frac{d x(t)}{d t}+x(t) \text { c. } \frac{d^{2} y(t)}{d t^{2}}+2 \frac{d y(t)}{d t}+y(t)=\frac{d^{2} x(t)}{d t^{2}}