The vectors P and Q are two adjacent sides of a parallelogram. Determine the area of the parallelogram when
(a) (3 in.) (7 in.) (a P= i+ j−2 in.)k and Q= −(5 in.)i + (1 in.)j + (3 in.)k
(b) P = (2 in.)i − (4 in.)j −(3 in.)k (4 in.)j and Q=(6 in.)i−(1 in.)j+ (5 in.)k.