exam Maths Puzzle Numerical Ability

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?

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exam Other Question

how do i find two consecutive positive integers such that the sum of their squares is 85? can you please help me with this question. I have been confused for about three hours and I would really appreciate it if you would help me. thanks....

x^2 - 7x - 18 = 0