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Is dark matter theory another description of Aether theory? Why is it necessary to ensure that bacteria have grown adequately on the media for DNase activity during a DNase test in microbiology? Algebra question - motion problem PLEASE HELP!? Solve the system by elmination -2x+2y+3z=0 -2x-y+z=-3 2x+3y+3z=5? A 30.9 Kg rocket has an engine that creates a 790 N upward force. What is its acceleration? (Dont Forget its weight)?