There are no craters visible on Sputnik Planum so the convection of the nitrogen ice cells is renewing the surface all the time, erasing craters. Alan Stern therefore constrains the age of Sputnik Planum to…?

Your answer is 1190.25

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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.