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

How to graph a linear system and estimate the solution. Then check the solution algebrically.
problem: 2x + y= 13
5x- 2y= 1
what is the value or values of p in the quadratic equation p2+13p-30=0