Answer:
x=10
Step-by-step explanation:
The two angles form a straight line so they add to 180 degrees
7x-3 + 12x-7 = 180
Combine like terms
19x-10 = 180
Add 10 to each side
19x-10+10 = 180+10
19x = 190
Divide by 19
19x/19 = 190/19
x= 10
The best answer to this question is A because the graph of a polynomial can have up to 1 less turning point than its highest degree. For example, a 10th degree polynomial can have 9 or less turning points.
