Can anyone PLEASE HELP WITH THIS QUESITON?!??!

If x+y+z=0 what is the value of [tex] {x}^{3} + {y}^{3} + {z}^{3} [/tex]

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?