Question 1007431
this is just matrix multiplication, you multiply rows of A by columns of X to get elements of B
( 1 0 )    times  ( a b )
( 0 2 )           ( c d )
*****************************
(  a  b )  equals ( 0 1 )
( 2c 2d )         ( 1 0 )
a = 0, b = 1, c = 1/2, d = 0
0 + 1 + (1/2) + 0 = (3/2)