Question

1)9a+9d
2) (x+2,3)-(x+7,8)
3) -(y-7,4+x)-(11,6-y)

Answer 1

1) 9a+9d=9*(a+d)
2) (x+2,3)-(x+7,8)=x+2,3-x-7,8= -5,5
3) -(y-7,4+x)-(11,6-y)= -y+7,4-x-11,6+y= - x-4,2