Answer: the scale factor is 1.6
Step-by-step explanation:
The attached photo shows Quadrilateral GHJK and Quadrilateral RSTU. Since they are similar quadrilaterals,
KG/UR = JG/TS = GH/RS = KJ/UT
10/16 = 14/TS
10TS = 16×14 = 224
TS = UR = 224/10 = 22.4
The scale factor is
16/10 = 22.4/12 = 1.6