exam Maths Puzzle Numerical Ability

y=x^2-7

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<a is complementary to <c. If <a=2x-10 and <c=4x+10, find the m<a and m<c. Ok just one more:

As part of a conservation effort for a lake, 40 fish are caught, tagged, and then released. Later 80 fish are caught. Four of the 80 fish are found to have tags. Estimate the number of fish in the lake.

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