exam Maths Puzzle Numerical Ability

solve equation 3+5h-9=4(3h+4)-1

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how do i find the domain of f(x)= x^3 + 5x / x^2 - 4x Could someone please help me solve this word problem I am not understanding how to solve it.

A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. When will the ball reach a height of 80 m?