exam Maths Puzzle Numerical Ability

On the blackboard ,the mathematics professor wrote a polynomial f(x) with integer coefficients and said"today is my son's birthday.when his age A is substituted for x,then f(a)=A,Y

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Can someone help me with this problem?

I need to write 0.21 as a percent.

Thanks,
Lyn given:angle4 is an exterior angle of the triangle
Proves:m angle 4= angle 1+ angle 2

m angle 3+ m angle 4=180??

those that is Definition Supplementary angles???