1. You have the following information:
 Sinx=5/13
 Cosx=12/13
 2. By definiton, you have:
 Tanx=(Senx)/(Cosx)
 3. When you susbtitute Senx=5/13 and Cosx=12/13 into Tanx=(Senx)/(Cosx), you obtain:
 Tanx=(Senx)/(Cosx)
 Tanx=(5/13)/(12/13)
 Tanx=(5)(13)/(13)(12)
 Tanx=65/156
 4. Therefore, the answer is;
 Tanx=65/156