Bonnie has a rectangular photographic print that is 5 inches wide and 7 inches long. If she multiplies both the length and width by 1.5, how will the perimeter of the print increase?

Answer 1

1.5 * 5 = ?

1.5 * 7 = ?

1.5 * 5 *2 + 1.5 * 7 *2 - 24 = ?

fyi it equals 15 + 21 - 24

so 36 - 24 = (12)

Answer 2

24 is the original perimeter.

P = 2l + 2w

Just wanted to add that information.

You could also just multiply the 24 times 1.5 to get the new perimeter of 36 and then take the difference. The math is a little easier.