Problems
OWY 1.26b Is the discretetime signal $x[n] = \cos \left(\frac{n}{8}\right)$ periodic? If it is, what is the time period? 

OWY 1.26c Is the discretetime signal $x[n] = \cos \left(\frac{\pi n^2}{8}\right)$ periodic? If it is, what is the time period? 
OWN 2.6 Compute the convolution of $x[n] = \left(\frac{1}{3} \right)^{n} \ u[n1]$ and $h[n] = u[n1]$ 
Consider the system defined by $y(t) = x(t) \ u(t)$. Is this linear, time invariant, stable, invertible? 
Bandpassfromoldexam
DTFS
Phasefunction
Two systems
Problem5fromoldexam  There is a small mistake in the solutions to the last part. The correct answer is 450Hz,500Hz,550 Hz
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