A: triangle PQR is transformed into triangle P'Q'R' by a scale of 1/2, because all coordinates of PQR multiple by 1/2 produce corresponding coordinates in P'Q'R'
B. when reflected across the y axis, the y values don't change, the x values become the opposites, so (-4,0), (-3,1), (1,-2)
C. No, they are not congruent. They are similar, but not congruent. A dilation produces congruent shapes. the side length of P''Q''R'' is only half of the side length of PQR
