exam Maths Puzzle Numerical Ability

Divide and simplify.

a^2/a^15

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exam Other Question

Use elimination to solve the system of equations.
4x-9y=15
3x-4y=14 The profit on a watch is given by P = x^2 - 13x -80, where x is the number of watches sold per day. How many watches were sold on a day when there was a $50 loss?

Thanks so much for you help this one has me stummped.