Answer:
b-3x+19
Step-by-step explanation:
you have to open the bracket so 3*x=3x
3*3=9
therefore;3x+9+10=3x+19
Answer:192
The answer is 63°
The lines intersect so opposite angles are congruent.
17. +5-2-1=+2
18. -7-6-2=15
19. +11-9-4=-2
20.+4-8+6=+2
36.70
Hope this helps!