Answer:
<em>20a. 143 deg</em>
<em>20b. 37 deg</em>
<em>20c. corresponding angles, congruent</em>
<em>20 d. same-side interior angles, supplementary</em>
Step-by-step explanation:
20a.
m<7 = 34
m<5 + m<7 = 180 (linear pair)
m<5 = 180 - 37 = 143
m<4 = m<5 = 143 (alt int angles)
20b.
m<2 = m<7 = 37 (alt ext angles)
20c. corresponding angles, congruent
20d. same-side interior angles, supplementary