Parentheses are the following symbols: ( & ). These are parentheses. These help to do equations for example : 3+2x3=9 u are to put the parentheses or the backetts or the {} to help solve the equation so this is the way to put them in : 3+(2x3)=9. Hope This Helps!

I usually start by looking for the smallest factor. In this case, I know that 2 is a factor of 72 because 72 is an even number. Divide 72 by 2 to get 36. Now I know that 36 can be divided by 3 to get 12. Now put the 2 back in to get 24. So 72/3=24.