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. Use this information for exercises 35 to 38.

When will the ball reach a height of 80 m?

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exam Other Question

What numbers can not be used for X and Why? Can someone please explain what to do to solve this problem? thanks!

(X^2 - 4)/(9 - x^2) Miguels insurance company will replace his car if repair costs exceed 80% of the cars value. The car recently sustained $8000 worth of damage, but it was not replaced, what is the value of the car?