Me!
the perimeter of a rectangle can be calculated using the equation p = 2 × 18.5 + 2 × 7.2.

which other equation could be used to calculate the perimeter?

a. p = 2 × 18.5 × 7.2

b. p = 2 × 18.5 + 7.2

c. p = (2 • 18.5) + 7.2

d. p = 2 (18.5 + 7.2)

The correct answer is D.

P = 2 x 18.5 + 2 x 7.2

Since you always multiply first according to Order of Operations (PEMDAS), you can go ahead and put the multiplying terms in factor to make this easier.

P = (2 x 18.5) + (2 x 7.2)

Notice that each set of parentheses has 2 x in it. Since that is a common factor of both sets of parentheses, you can pull it to the outside.

P = (2) (18.5) + (7.2) 

Now, your remaining terms can be put into a single set of parentheses.

P = 2 (18.5 x 7.2)

So, the correct answer is option D. P = 2 (18.5 + 7.2) .