Answer:
the number is 87
Step-by-step explanation:
the photo contains step by step
X=36
3x+72=180
3x=180-72
3x=108
x=36
No
2x+23
The perimeter of a triangle is calculated by adding the sum of all sides.
Therefore, in the given problem, the perimeter will be:
Perimeter = 21-x + 2x-3 + x+5
= 2x+23
