If all four input resistors to a summing amplifier are 
and the feedback resistor is 
, then the gain equals ________.
Definitions:
Double Membrane
A double membrane is a structure featuring two lipid bilayers, such as those surrounding certain organelles, including mitochondria and the nucleus in eukaryotic cells.
Eukaryotic Cells
Cells that contain a nucleus enclosed within membranes, distinct from the simpler prokaryotic cells; they include all plant, animal, fungal, and protist cells.
Nucleus
a membrane-bound organelle found in eukaryotic cells that contains most of the cell's genetic material.
Yellowstone National Park
A national park located primarily in Wyoming, extending into Montana and Idaho, known for its wildlife and geothermal features such as geysers and hot springs.
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