Respuesta :

Step-by-step explanation:

Perimetre = 2(6x + 9) + 2(4x - 1)

;l multiplied by 2 on each and every length because there are 2 sides of equal length

; Then we simplify the brackets

; Perimetres = 12x + 18 + 8x - 2

; Perimetre = 20x + 16