Which two equations are equivalent? a y = (x 4)2y = x2 16 b y = (x – 3)2y = x2 – 6x 9 c y = (x 2)2y = x2 2x 2 d y = (x – 6)2y = x2 – 12x – 36?

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 =