7. The voltage of the power supply in an AC-DC coupled circuit is given by the function, V(t) = 120 sin 4t + 5, where t is time, in seconds, and V is the voltage, in volts, at time t. a. Find the maximum and minimum voltages and times at which they occur. b. Determine the period, T, in seconds, the frequency, f, in hertz, and the amplitude, A, in volts, for this signal