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. when will the ball reach a height of 80 m?

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Hey Tutors!

If you have time, could you please help me with this problem? Thanks!

"Find at least one solution of x^2-x=12"


- student in need :)
I have $30 in my drawer consisting of dimes and quarters. Write an inequality that shows the different number of coins in my drawer.

.25x + .10y < $30


Is that all that is needed for a question like that?