One of the factors that misled the herschels into concluding that we are at the universe's center was:
a. hot hydrogen gas in our galaxy's disk, its emission hiding the more distant stars
b. dust that obscures the more distant stars and thereby localizes observations
c. gravitational lensing of light by dark matter, distorting the positions of the stars
d. some "neutron star clusters" that are actually distant galaxies that are distributed uniformly around the sun

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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some women in the middle and upper classes worked as doctors, government officials, or priestesses. both women and men enjoyed a better quality of life the higher they were on the social pyramid. the egyptians believed that their class system created a stable, well-ordered society. each group had its own role to play.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

c. troops marched forward in close formation against newer, more accurate weapons