Answer:
Option C. m∠8=70°
Step-by-step explanation:
see the attached figure to better understand the problem
step 1
Find the measure of angle 5
we know that
m∠5=110° -----> by corresponding angles
step 2
Find the measure of angle 8
we know that
m∠8+m∠5=180° -----> by supplementary angles (form a linear pair)
we have
m∠5=110°
substitute
m∠8+110°=180°
m∠8=180°-110°=70°
