Please answer in need help

A

Step-by-step explanation:

Perimeter = 4x² - 3 + 4x² - 2 + 4x² - 1   {add like terms}

                 = 4x² + 4x² + 4x² - 3 - 2 - 1

                 = 12x² - 6

If x = 1.5,

12x² - 6 = 12*(1.5)² - 6

             = 12* 2.25 - 6

             = 27.0 - 6

             = 21 inches

1

step-by-step explanation:

it's the only multiple of both and the least

30

step-by-step explanation:

times by times