Answer :
163º
1) Since the sum of interior angles of a pentagon can be found by using this formula:
[tex]\begin{gathered} S_i=180(5-2) \\ S_i=180(3) \\ S_i=540^{\circ} \end{gathered}[/tex]2) Then we can write out the following equation for the missing angle:
68º +x +85º +103º +121º = 540º
x+377º= 540º
x= 540º-377º
x= 163º
3) Hence, the answer is 163º