book Maths Puzzle Numerical Ability

1.Let r be the number, that results when both the base and the exponent of a^b are tripled, where a and b are positive. If r=a^bx^b, where x is positive, then x equals?

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book Other Question

Solve using the quadratic equation:
x^2 - 3x - 23 = 5

3x^2 - 2x = 15x - 10 how to solve for the partial perimeter of a circle between two points of a cord if i am given the length of the cord and the radius of the circle?