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)

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:

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

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

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

12*c

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it