Answer:
supplement of an angle is what must be added to that angle to get 180
51+supplement=180
minus 51 both sides
supplement=129
answer is 129
Answer:
100
Step-by-step explanation:

It’s 9. 9+3=12
3,6,9,12
The twice of 3 is six more than twice is nine.
Answer:
°
Step-by-step explanation:

Answer:
$180
Step-by-step explanation: