(03.07 lc) choose the equation of the horizontal line that passes through the point (−2, −1). (5 points) select one: a. y = −1 b. y = −2 c. x = −2 d. x = −1

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 =