^​Can someone pls answer these question
​Factorise
​1)16a²​+72a+81
​2)2xy+2y+3x+3
3)p²​+qr+pq+pr
4)y²​-14y+49
​5)x²-xz+xy-yz
​6)a³3a²+a-3
7)6pq-q²​+12pr​-2qr
​​8)xy-pq+qy-px
9)6xy-4y+6-9x
​10)pq-mn+pn-mq