Look at the photo plz write the ans of a$,$b$,$c you dont have to explaine Q$5(6$ marks$)$: Convert the following infix expressions to postfix.

a$)21+8**2-\frac{7}{2}+3$

b$)(21+8)**2-\frac{7}{2+3}$

c$)21+8**\frac{2-7}{2}+3**5$