Answer:
D:)
Step-by-step explanation:
The numbers:
1, -3, 2, -9, 3, -15, 4, -21,
are not linear.
If it was linear:
4, 3, 2, 1, -3, -9, -15, -21
Yo sup??
m3 and m6 for a supplementary pair therefore
m3+m6=180
122+m6=180
m6=58
Hope this helps