Final answer:
To compute the signal, a time vector needs to be created and the sine functions evaluated at each time increment. Then plot these values over the interval [0,3] seconds with time on the x-axis and the signal on the y-axis.
Step-by-step explanation:
The student is tasked with computing and plotting the signal x(t) = 2sin(πt) + sin(2πt) + \frac{3}{2}sin(3πt) for t in the interval [0,3] seconds with Δt = 0.02 seconds. To complete the task, the student can create a time vector t that increments by 0.02 from 0 to 3, and then evaluate the sum of the three sine functions at each point in time. To plot the signal, use this discrete set of time points and corresponding x(t) values on a graph with time on the x-axis and signal amplitude on the y-axis.