Question

A rectangle ha a length of (x3) centimenter and a width of 12x centimeter. If the perimeter i 84 centimeter, what i the length of the rectangle?

Answer 1

33.6cm

Explanation:

I'm assuming the length is 3x as there are quite a few typos

perimeter = 2 x length + 2 x width

84 = 2 x 3x + 2 x 12x

84 = 6x + 24x

84 = 30x

84/30 = 2.8

x = 2.8

12x = 2.8 x 12 = 33.6 cm