If `A=[(3,-7)]` then `A^'` is equal to

If first two numbers of the direction cosines of a line joining points (1,2,0) and (3,-1,z) are (2/7),-(3/7) then z is equal to

If (x,3)+(2,5)=(7,8) then x is equal to a)2 b)5 c)7 d)9

In a triangle ABC, if a:b:C=3:7:8, then R:r is equal to

3/7 of 2/5 is equal to:

If A square matrix such that A^2 = A , then (l+A )^3 -7A is equal to :

If A is square matrix such that A^(2)=A, then (I+A)^(3)-7A is equal to (A)A(B)I-A(C)I(D)3A

If A is a square matrix such that A^(2)=A, then (I+A)^(3)-7A is equal to (a) A (b) I-A(c)I(d)3A

If a square matrix such that A^(2)=A, then (I+A)^(3)-7A is equal to A(b)I-A(c)I (d) 3A