Determine the value of k for which -3x^2+12x+k=0 has no roots.

according to worldatlas.com, the u.s. has an 86% literacy rate.

the american civil war was not caused   by slavery but by economic factors.

the sugar act, also known as the american revenue act, was a revenue-raising act passed by the british parliament of great britain in april of 1764. the earlier molasses act of 1733, which had imposed a tax of six pence per gallon of molasses, had never been effectively collected due to colonial resistance and evasion.