exam Maths Puzzle Numerical Ability

Jill and Jack play basketball. In the first game, Jill had a foul shot average of 0.60(she made 12 or 20 shots), and Jack had a foul shot average of 0.50(he made 5 out of 10 shots)

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solve using the quadratic formula
this problem is taken from a homework sheet on quadratic equations, can you please show me the necessary steps involed in completing this problem.

x^2-3x-3=-5 Could someone help me please? The problem is:
A ball is thrown upward from the roof of a building 100m tall with an initial velocity of 20m/s. When will the ball reach a height of 80m?