book Maths Puzzle Numerical Ability

Why is it necessary for two rays to have the same endpoint in the definition of an angle?

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book Other Question

Fill in the tables using the given formulas
y = 10x + 100
______________
_x_________y___
-20
_____________
-10
_____________
0
_____________
10
_____________ How do I find the leading coefficient of p(x)=(x+2)^17?