Can i link a powered mixer to another amp make more volume?

Yes. You can connect a powered mixer to another amplifier to increase the overall volume of your sound system. You can do this by connecting the "speaker outputs" from the powered mixer to the "inputs" of the amplifier. This will allow you to use both the power of the mixer's amplifier and the amplifier that you have connected. This can give you more volume than if you were to use the mixer or amplifier alone.