Answer:
Do you still need help??
Step-by-step explanation:
Add the two angles and set them equal to 180, them solve for x
Answer:
-2497
Step-by-step explanation:
Sn=n/2[2a+(n-1)d]
=22/2[2*-40+(22-1)d]
=11(2*-40+(21*-7)
= -2497
It would be the third one 7n=10-3n
