exam Maths Puzzle Numerical Ability

Find the domain of f(x)= x^2e^2x (this reads x squared e raised to the 2x)

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exam Other Question

The sum of the digits of a two-digit number is 15. if the digits are reversed, the new number is only 9 more than the original number. What was the original number? find the area of the space enclosed by two concentric circles of radii 15cm & 13cm.