Let $f(x)= \lceil (2x+1)/3 \rceil$. We learned about the set of all images for a given set. So if your answer has more than one number in it, list the values separated by commas.

(a) $f( \lbrace 3 \rbrace)$ = $\lbrace$ $\rbrace$

(b) $f( \lbrace -2 \rbrace)$ = $\lbrace$ $\rbrace$

(c) $f( \lbrace 3,7\rbrace)$ = $\lbrace$ $\rbrace$

(d) $f( \lbrace -2, -9,3 \rbrace)$ = $\lbrace$ $\rbrace$