due today please help if I don't pass I won't be able to go to the school I want and ill never see the joy of being their so please help OR ILL ROB UR HOUSE

Which of the following parabolas opens down?

Consider circle o, where and . m∠bpd °. °.

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 =