I am using a Analog digital converter which utilizes 6 741 op amps. Can someone tell me if I need to add all the slew rates together to find the maximum frequency. Or do I just use the slew rate of the Op Amp.
No, they are not additive. If they are in series, connect the amplifier with the highest slew rate as the final stage, and the smallest slew rate as the first stage.
They are not additive. Its the individual property.