Factorise [(a+2b)+(2a-c)+(a+2c)]^3 - 3abc

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

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?