Answer:
the answer should be A. 10 degrees because first all you need to remember when an angle is supplememntary all sides equal to 180 degrees always so you need to set up an equation like this one 10x+80=180 and then you solve it as shown below and remember if you do it to one side do it to the another side.
10x+80-80=180-80
10x/10= 100/10
x= 10 so a is the correct answer and give me brainliest please and if you want to check your work replace x with 10 and multiplied by 10 which will give you 100 and add 80 making the answer 180 so 10 is the correct answer and have a great day.
Step-by-step explanation: :DDDDDDDDDDD
