exam Maths Puzzle Numerical Ability

Evaluate k^2-5 when k =-6

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exam Other Question

Two planes left an airport at noon. One flew east at a certain speed and the other flew west at twice the speed. The plains were 2700 miles apart in 3 hours. How fast was each plane flying? Find the sum of the first five terms of the series
1 + 8 + 64 + 512 + .......