exam Maths Puzzle Numerical Ability

i do not even know where to begin on this problem

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exam Other Question

This is from a worksheet from the instructor: Write the following rule as a formula using function notation: Tuition cost in dollars is sixty-five times the number of credit hours.
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 80m?

I would appreciate help with this one. Thank you!