 
			 
			MCQOPTIONS
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				| 1. | Find the function f3 (t) from the time t = 3 to 4 sec. | 
| A. | (20t 40) [u (t-3) u (t-4)] | 
| B. | (20t + 40) [u (t-3) u (t-4)] | 
| C. | (20t + 40) [u (t-3) + u (t-4)] | 
| D. | (20t 40) [u (t-3) + u (t-4)] | 
| Answer» B. (20t + 40) [u (t-3) u (t-4)] | |