How many touch point can be added to a Fallout Visualization?

A brank client wants to understand usage of their mobile website by geographical region. The analytics team is tasked with creating segment to provide this data.
Why would the analytics team decide to use segment stacking In the Segment Builder?

An analyst has been given a list of dimension available to conduct an analysis on their hospital's site .
The Solution Design Reference (SDR) contains:
Event -Start Appointment Booking - Set on: Appointment Booking Start event2 - Booking Complete Set on Booking Complete eVar Doctor - Type Set on event evar2 - number of available Appointments - Set on event prop Appointment patting Given the SDR which report can be generated?

A streaming media company's acquisition team want to understand when to end a free trial subscription of its product to maximize value.
Which Visualization in Analyst Workspace provides this information?

An Analyst would like to display the number of visits directly as a chart in Report Builder.
How can this task be achieved of possible?