Answer:
x=13
Step-by-step explanation:
set up the equation:
AXB+BXC=AXC
(2x+10)+(2x+10)=(6x-6)
calculate for x
x=13
D (7) should be the correct answer.
Answer:





Step-by-step explanation: the other angle is equal to his simmetrical, cause the triangle is isosceles, so is value is x. The sum of the angle in a triangle must be 180°