You do it because if you added before you multiplied your answer would be way out in the atmosphere. I'm not sure who invented that though...
multiply first, and then add
You have to multiply to find area you have to add to find perimiter
you are suppose to MULTIPLY on area.
You multiply.
multiply
multiply first, and then add
You have to multiply to find area you have to add to find perimiter
you are suppose to MULTIPLY on area.
Multiply
multiply
You multiply.
multiply
170
you can multiply 281 and 3 you can add 840 and 3
Multiply for the area, add for the perimeter.
Add.
you add