Question

Select the proper placement for parentheses to speed up the addition for the expression 4+6+5

Answer 1

4+6+5
I will use parentheses in 4 and 6, so
4+6+5
=(4+6)+5
=10+5
=15. Hope it help!

Answer 2

(4 + 6) + 5.....I would think it would be this one