Answer:
35.7 / 0.07 = 510
486.12 / 0.6 = 810.2
explanation-
I don't know how to explain but it's right!
B. is reasonable because 9.2×4.8 = 44.16
Answer: 
Step-by-step explanation:
Rewrite it in the form
, where 

Use Square of Sum: 

Answer:
55 = 550
Step-by-step explanation: