The correct answer to the question is 2
4√25-6√10+6√10-9√4
4×5-9×2
20-18
2
Answered by Gauthmath must click thanks and mark brainliest
Answer: The correct expression is (A) 6b.
Step-by-step explanation: Given that Serena is writing an expression that is equivalent to (12ab - 6b), but she has not completed it.
The incomplete expression is ?(2a - 1).
We are to find the missing term from the above incomplete expression.
We have

Thus, the complete expression is 6b(2a - 1).
Option (A) is correct.
He can send 600 messages.
40+0.05x=70
-40+0.05x=70-40
0.05x=30
So divide 30 by 0.05
and you get 600.
5 hours because 5x6 = 30 +20 =50