The answer is -12g-3f-4. Hope this helps!
Answer:
C
Step-by-step explanation:
I took the test
The balanced equation for the given reaction 
<h3>What is a double replacement reaction?</h3>
A double replacement is a chemical reaction that takes place in which two reactants swap cations or anions to produce two distinct products.
Whenever the cations representing one of the reactants interact with the anions from another reactant to produce an insoluble ionic compound, a precipitate occurs.
The balanced equation for the given reaction:

Learn more about double displacement reactions here:
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Answer:
Mikhail is 42 years old
Step-by-step explanation:
Answer: 7,000,000
A million= six zeroes
Ones, tens, hundreds, thousands, ten-thousands, hundred-thousands, millions
Each place value represents an additional zero