Answer:
16
Step-by-step explanation:
By intersecting secants theorem:

CE = 9 + (2x - 17)
CE = 9 + (2*12 - 17)
CE = 9 + (24 - 17)
CE = 33 - 17
CE =16
A is correct. Your welcome :)
Answer:
B) 100
Step-by-step explanation:
All 3 interior angles of a triangle add up to 180 so:
x + 25 + 55 = 180
x + 80 = 180
x = 180 - 80
x = 100
Degree is the value of the highest power of the variable, and hence in this case is 8