Answer:
10m + 27
Explanation:
To find the perimeter simply add the expressions of each side
So perimeter = 2m + 10 + 2m + 2m + 2m + 7 + 2m + 10
By combining like terms we acquire 10m + 27
Remember like terms are terms with the same variable and degree.
An example would be 7x and 3x as both have a variable of x and a degree of 1