book Maths Puzzle Numerical Ability

7 squared - 5 squared
_over____
5 cubed

this is a fraction.

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book Other Question

a line passes through a(1,-3) and b(2,7)
write the equation of a line perpendicular to a. how would you go about solving this problem? the square of a number decreased by the square of one half the number is 108. find the number.