Answer:
Sure, let's sketch and label each of the signals based on the given continuous-time signal x(t) shown in Fig. 1-17.
(a) x(1 - 2):
To sketch x(1 - 2), we shift the original signal 2 units to the right.
(b) x(21):
To sketch x(21), we take the value of the signal at t = 21.
(c) x(1/2):
To sketch x(1/2), we take the value of the signal at t = 1/2.
(d) x(-1):
To sketch x(-1), we take the value of the signal at t = -1.
Unfortunately, since there is no provided description or visual representation of the signal in Fig. 1-17, I am unable to accurately sketch and label each of these signals.