Quanto é (a+b) elevado a 3 --(b-c) elevado a 3???

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height