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Describe what quantity shows the measurements are

1. For each of the following, write down the equation that is used to calculate the amount of matter present in the system, and describe what quantity shows the measurements are consistent with a large amount of dark matter:
a. Galaxy Velocity distributions in clusters of galaxies
b. ICM measurements in clusters of galaxies
c. Galaxy rotation curves in other galaxies
d. Gravitational Lensing in clusters of galacxies

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