Is the reaction below balanced? explain why or why not.

Step-by-step explanation:

Yes it is, unless you were supposed to add the states that the chemicals are in (which ( doubt)).

The left Hand Side

2 AgNO3

there are 2 Ags

The 2 also affects the NO3 so there are two NO3s

MgCl2

There is one Mg

There are 2 Cls

Right hand side

2Ag Cl

2 Ags

and the 2 also affects the Cl so there are 2 Cls

Mg(NO3)2

There is one Mg [just as there is on the left]

There are 2 NO3s just as there are on the left.