book Maths Puzzle Numerical Ability

(x-7) (2)
_=___
(x-9) (x-9)

I keep coming up with N.S.

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a plane flying the 3458-mile trip from new york city to london has a 50-mph tailwind. the flight's point of no return, is the point at which the flight time required to return to n If anglesA,B, and C are the sides of a triangle such that sin(A+B)=1/cos(C) and cos(A+B)=cos(C), then show that the triangle is a right triangle