exam Maths Puzzle Numerical Ability

Simplify and evaluate
(x^3y^-4z^0/5x^6y^8)^3

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exam Other Question

Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form ax^2+bx+c=0. Solutions are -9,4.
The answer I got is x^2+13x-9=0. Is that right? To fly due north at 580 km/h with a 45 km/h blowing toward 130o, what speed and direction should the plane travel?