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Which expression gives you the distance between the points (5,1)and(9,-6)

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =