Respuesta :

camicastaneda

3. 12 a

4. 7b-10

all you have to do is add up all of the sides.


AnimeBrainly

3) Find the perimeter: Add all numbers with the same amount of variables together:

3a + 4a + 5a = 12a

12a is perimeter

4) (3b - 5) + (3b - 5) + b

Add numbers with variables together, and the constants together

3b + 3b + b = 7b

-5 + -5 = -5 - 5 = -10

7b - 10 is the perimeter


hope this helps