book Maths Puzzle Numerical Ability

The lines satsifying the equations x + dy=3 and 3y +ax=2 are perpendicular to each other find a

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book Other Question

write an algebraic expression for each verbal expression.
"triple the difference of 55 and the cube of m"
Simplify.... (x^3-8) / (x-2)


Comment---> no idea where to start!

Thank you