1/5 + 1/4 =1/x
4x + 5x = 20
9x = 20
x = 2.22 hours Answer
D will because water just turns from liquid to a gas by adding heat. That is a physical change. The other equations are chemical changes.
this is my attachment answer hope it's helpful to you
Maybe because gravity has control of each formation of the solarsydtem thats why its just a guess
The charge on Pb in Pb(SO3)2 is Lead (IV) Sulfite.
