Answer: the answer is D
Step-by-step explanation: may i please have brainliest.
i can't comment so someone else is going to have to answer
but they need the whole page to answer this question.
It is 12 sense the perimeter is the outside of the square you have to add the 2 numbers by themselves because they are the same measurement and 5+5=10 1+1=2 10+2=12
the answer is communicative
24a-18a+12a is equal to 18a
hence, divide it by 6a
so you get 3a :)
