What sources of error would account for differences in measurement of the same thing?

The main source of error in measurement is the human itself who is performing the measurement. There could be differences in the measuring method which led to differences in the measurement.

Another source of error could be error on the measuring device. Before using the  device, it must be made sure that the device is calibrated to be used as a measuring device.

the correct answer is:

it required the president to inform congress within forty-eight hours of any new troop commitment.

the war powers resolution (1973) is a federal law designed to limit the u.s. president’s ability to initiate or intensify military actions abroad without the approval of the congress.

it establishes that the president can send armed forces into action abroad only by declaration of war by congress, statutory authorization, or in case of a national emergency created by attack upon the united states, its territories or possessions, or its armed forces.

it requires the president to notify congress within 48 hours of sending armed forces to military action.

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