Answer:
0.7
Step-by-step explanation:
Take the scale factor as Z.
9 x Z = 6.3
14 x Z = 9.8
7 x Z = 4.9
Find Z
6.3/9 = 0.7
9.8/14 = 0.7
4.9/7 = 0.7
Z = 0.7
