Solve it clearly

Exercise $2[20$ marks$]$:

$($a$)[10$ pts$]$ Plot the ideally sampled signal and its frequency spectrum for the signal $x(t)=25sinc(250t),$ for sampling frequencies of $50,150,$ and $250$ Hz $.$ Discuss the suitability of these sampling frequencies for the ideal reconstruction system.

$($b$)10pts$ Repeat Parts $($a$)$ for the following signal $y(t)=25sin{c}^2(250t).$