My teacher didnt properly explain these to me and I need them answered but cant get the right answer

Ex. 150. An exponential function of time starts at t=0 and y=20 and decreases exponentially until it reaches a steady state value of y=17. The time constant is 11 seconds. The function can be expressed as: y(t) = A exp( B t ) + C. Determine A,B, and C. ans:3 Nathaniel Driskell

Ex. 160. An exponential function of time starts at t=0 and y=-3 and increases exponentially until it reaches a steady state value of y=10. The time constant is 7. The function can be expressed as: y(t) = A ( 1 – exp( B t )) + C. Determine A,B, and C. ans:3 Nathaniel Driskell

Ex. 130. Given the s-domain signal: F(s) = ( 7 s^2 + 7 s + 17) / (s^3 + 16 s^2 + 17 s). Determine the steady state value of f(t) using the final value theorem. ans:1