Answer:
C.) 48 degrees
Step-by-step explanation:
First you need to find x. We already know that is a straight line or 180 degrees, so you will make an equation to solve which is: (7x-1)+(3x-9)=180
To solve this equations you have to take away parenthesis and group like terms:
7x+3x-1-9=180 turns into 10x-10=180
Then you have to add ten to both sides then divide by ten and the answer is x=19
then you just have to find the angle of ABC by solving 3x-9, substituting 19 for x
Then the answer to that is 48 degrees
