Question

Select the proper placement for parentheses to speed up the addition for the expression 4 + 6 + 5 A. (5 + 4) + 6 B. (4 + 6) + 5 C. (5 + 6) + 4 D. 4 + (6 + 5)

Answer 1

Answer:

The answer is B. (4+6)+5.

Step-by-step explanation:

To find the proper placement for a parentheses to speed up the addition, fisrt we have to look the expression:

$4+6+5$

We can place the parentheses for the first two terms and make it simple, this is:

$(4+6)+5$

It makes the sum easy because you can make the sum in two parts.

The answer is B. (4+6)+5.

Answer 2

Answer is 

B. (4 + 6) + 5

hope it helps