Respuesta :

Answer: 4.46 cm

Step-by-step explanation:

The image size = 30.51cm

Width of the page = 21.59cm

To know the extra width , we will subtract the width of the page from the width of the image. That is

30.51 - 21.59 = 8.92cm

to center the image , we will divide the extra width by 2 , that is

8.92/2 = 4.46cm

Therefore ; Joelle should use 4.46cm  horizontal position for the left edge of  the image to center the image