Find the volume of the parallelopiped with segments AB, AC and AD as concurrent

Find the volume of the parallelopiped with segments AB, AC and AD as concurrent edges, where : (1) `A-=(3,7,4),B-=(5,-2,3),C-=(-4,5,6)andD-=(1,2,3)` (2) the position vectors of A,B,C,D are `hat(i)+hat(j)+hat(k),2hat(i)-hat(j),3hat(i)-2hat(j)-2hat(k)and3hat(i)+3hat(j)+4hat(k)`.