book Maths Puzzle Numerical Ability

I need to Factor polynomial, if possbile

xy - ty + xs - ts

Any help would be great:)

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book Other Question

|x+8|<0 A round barbecue pit is 2 meters in diameter. What is the distance around the barbecue pit?
a- 6.28 meters
b- 3.14 meters
c- 12.56 meters
d- 18.84 meters