Answer:
The completed reaction is
CaCO3 + 2 HCl → (Ca+2 + 2 Cl-)aq + H2O + CO2↑
7-(-2)=7+2
Step-by-step explanation:
7-(-2)=9
7+2=9
Hope this helps!
no this is not a quadratic function
5=a
the answer is a