We will have the following:
9.
From the information provided we can obtain the following:
We know that m<3 = 75°.
m<12 = 35°, but by corresponding angles m<4 = m<12 = 35°.
Then:
[tex]\begin{gathered} m<3+m<4+m<5=180\Rightarrow75+35+m<5=180 \\ \\ \Rightarrow m<5=70 \end{gathered}[/tex]
Now, by opposite angles we have that m<5 = m<8 = 70°.
11. We will have the following from the information provided.
We know that m<3 = 75° and by corresponding angles m<3 = m<1 = 75°.
