A DAC uses a reference voltage of 80 V and has 6-bit precision. In four successive sampling periods each 1 sec long. the binary data contained in the output register were 100000, 011111, 011101, and 011010. Determine the equation for the voltage as a function of time between sampling instants 3 and 4 using
(a) a zero-order hold and
(b) a first-order