The scale factor is:

So you divide the corresponding lengths and the ratio you get is the scale factor. Hope it helps!
Well you would just multiply 374 by 15 and that would be your answer
Answer:
0.699 (=69.9%)
Step-by-step explanation:
Efficiency = total hits / total attempted
given total hits = 51 and total attempted = 73
Efficiency = 51/73 = 0.699 (=69.9%)