Answer:
m is equals to 49 degree + 31 degree so which means it's 80°
X=12.5
If the perimeter is 90
90=3x+3x+15
Combine like terms
90=6x+15
Subtracts 15 from both sides
75=6x
Divide by six to get x by itself
12.5=x
Does this help?
The answer is 41% hope this helps
