The income level of which group declined throughout the 1920s?
a. automobile workers
b. communication workers
c. stockholders
d. farmers

The correct answer for the question that is being presented above is this one: "b. communication workers." The income level of communication worker declined throughout the 1920s. In the 1920s, this is the time during the World War I where the communication workers and their services are greatly affected.

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See diagram.we use washers to get the area and we will be integrating with respect to xouter radius is the  distance between y = e^x and y = -1    inner radius of washer is the distance between y = 1 and y = -1    the area of one cross-section of a washer is    solid lies between x = 0 and x = 2. the volume is    if you need this expanded, then    the question doesn't say to evaluate, so we're done.