Answer:
Step-by-step explanation: one angle is 6x + 9 also equals to 9x -30
9x - 30 = 6x + 9
3x = 39, x = 13
Angle is 6×13+9 = 87
C)
you look at were the graph starts to decrease then look at the X-VALUE not the y-value
the x-val at the start of the decrease is -3 and at the end of it it is 2 therefor -3

x

2
The Answer is x=15. Good luck!
1.

or if you mean (3x^3+5x^2+3x-7)+(8x-6x^2+6):

2.

Answer : I’ll say it’s B.
If it’s wrong sorry. I tried.