exam Maths Puzzle Numerical Ability

8x^6-7x^3y^3-y^6

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exam Other Question

A ball is thrown upward from the roof of a building 100m tall with an initial velocity of 10m/s. When will the ball reach a hieght of 80m?

Same thing I can not understand how to solve this type of problem, thank you so much for the help:-)
The problem is Find the Amplitude, period, and phase shift(s) of the function.
f(x)=4cos(x + (pi / 3))