The voltage, V (in volts), in an electrical outlet is given as a function of time, t (in seconds), by the function V(t) = 156cos(120nt) . (a) Find the rate of change of voltage with respect to time. V' (t ) = volts/sec (b) Is the voltage increasing or decreasing at t = 1/95 seconds? O increasing O decreasing (c) What is the maximum value of the rate of change? Give an exact answer. volts/sec