exam Maths Puzzle Numerical Ability

(X^2 Y^4) ^1/^2

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If P = 7y + 2xy - 6x and Q = 5 - 7y, find the value of 3P - 4Q. Please help I am very confused on this one. Please Help Me
In 2004, the population of Mexico was 106.5 million. If Mexico's population continues to grow at an annual rate of 1.43%, then the population in 2015 will be 106.5 (1.0143)million