已知方程x²+kx-12=0的一个根为2，求k的值及方程的另外一个根。

On an oceangoing vessel，for each person a lifeboat (without desalting kits) is certified to carry，the boat must be supplied with（）.

A.2 pounds of condensed milk

B.a signaling whistle

C.3 litres of water

D.a life preserver