What is the oxidation number of each element in CaCO $3(1$ point each$).$

Ca$\_\_\_\_\_\_\_\_$ C$\_\_\_\_\_\_\_\_\_$ O$\_\_\_\_\_\_\_\_\_\_$

What is the oxidation number of each element in CH$4(1$ point each$).$

C$\_\_\_\_\_\_\_\_\_$ H$\_\_\_\_\_\_\_\_\_$

Balance the following equation $(5$ points$)$

$\_\_\_\_\_$Al $($s$)+\_\_\_\_\_$Cu $+($aq$)->\_\_\_\_\_$Al $3+($aq$)+\_\_\_\_\_$Cu $($s$)$