5 I guess I don't know if it's the right answer
Who’s thattt IS THAT A BOT OR SOMETHINF AND DO U NEED HELP?
Answer: The measure of the vertex angle = 80°
Step-by-step explanation:
Angle sum property of triangle : The sum of the measures of the angles for any triangle is 180 degrees.
So,
'
Then, vertex angle = 
Hence, The measure of the vertex angle = 80°
X equals 4 because 2 times 2 equals 4 and then 4 times 4 =16