The answer is D because for light 3 to function switch d does not have to turn on
It matters to the aerodynamics of it because sometimes it's good to have the weight but only if it can take it.
Answer: The precipitate formed is 
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid or precipitated form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:

Answer:
Electronegativity decrease in group from top to bottom
Explanation:
0.428571429 moles is your exact answer. Hope this helps!!! (: