exam Maths Puzzle Numerical Ability

In a survey of 75 resorts, it was reported that:
34 provided refrigerators in the guest rooms
30 provided laundry services
37 provided business centers
15 provided refri

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exam Other Question

(4 sqrt s + 11 sqrt t)(4 sqrt s - 11 sqrt t)

To me, this is a difference of squares. How is the anser written?? help please
solve the rational inequality (x-2)/(x+3) is less than or equal to 0

is it: (-3,2] (-oo,-3) (-oo,-3)U{2,oo) or [2,oo)
i am very confused