Answer:
0.25
Step-by-step explanation:
Scale factor = ratio of the sides
Assuming the first rectangle is with shorter side 6,
Scale factor = 1.5/6 = 15/60 = 1/4 = 0.25
Divide the new length by the original length:
The arrow points from 6 to 1.5, so the new length is 1.5 and the original length was 6.
1.5 / 6 = 0.25. The scale factor was 0.25