Question 799760
Width = x
Length = 3x - 15
Perimeter = 2*width + 2*length
34 = 2*x + 2*(3x - 15)
34 = 2x + 6x - 30
Collect like terms:
8x = 64
x = 8
Width = 8cm
Length = 9cm
Hope this helps.
:-)