book Maths Puzzle Numerical Ability

I have a hard time trying to find an ansewer for M+16=34,567 can you help me?

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book Other Question

complete the square, and find the roots of the quadratic equation.

x^2 - 2/3x = 0
The length of a rectangular swimming pool is 2x-1 meters, and the width is x +2 meters. Write a polynomial that represents the area. Find the area if x is 5 meters.