Answer:
The right option should be c
Step-by-step explanation:
The measure of (OH-)
The answer is D. Trust me.
$60
400 ÷ 7 = 57. 1428571429
Since that's not an option we estimate it. The closest number is $60 so, there's your answer!
I hope this helps! sorry if it's wrong :(
~ Kana ^^