exam Maths Puzzle Numerical Ability

A ball is thrown upward from a roof of a building 100m tall with an initial velocity of 20m/s. Use this information for exercise 35-38.

#36
When will the ball reach a height of

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How do I find the slope and y intercept represented by

y=3x+5 How many kilograms of nicker silver containing 18% zinc and how many kilograms of nickel silver containing 31% zinc must be melted together to produce 700kg of a new nickle silver containing 22% zinc???