exam Maths Puzzle Numerical Ability

Please help me with this problem. The problem says to simplify and express final result with positive intergers as exponents. (15x^-2y )-^2

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need help on this equation..


5(4-k)= -10k




i tried to do it but not sure.

5(4-k)=-10k
5+5k=-10k
-10k+5k=5
-5=5
k=-1 ? An airline reports that it has been experiencing a 15% rate of no-shows on advanced reservations. Among 150 advanced reservations, find the probability that there will be fewer than 20 no-shows.