book Maths Puzzle Numerical Ability

n^200<5^300 find the value 0f n.

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book Other Question

Algebraically show whether the point M(2,-3) is on the line defined by
3x - 6y + 1 = 0

Can i please get some help with this question?
i have worked on this problem and can't get it

solve:

a over a+1 + 2a+4 over a^2-3a-4=2 over a-4

show work