exam Maths Puzzle Numerical Ability

please help me solve this equation 2[3(4divide2)+ 6]-5

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exam Other Question

Can some one help me solve this problem?
Suppose instead that the town experiences growth that can be modeled by the following:
P=1000 squareroot t+ P, WHERE T IS THE NUMBER OF Factor the greatest common factor: 4a2 xy4 p-6a2 x4

Thank you!