Answer Happy

Please can you solve the problem on your own in clear handwriting and simple explanation, I need to understand the solution. Thank you.
Problem 1: A continuous-time signal xc (t) = 2sin(25nt) + sin(15πt) + 4 sin(20πt) + 2 sin (30πt) + 3 sin(35πt) is sampled at a rate of 25 samples/s and then passed through a perfect D/A converter to produce the analog signal y, (t). (a) Identify which terms in xc(t) are aliased. (b) Find ye(t).