for the "determine data needs" activity of a project, the optimistic estimated duration is 10 days, the pessimistic estimated duration is 20 days, the most likely time is 15 days. what is the expected duration of completing this activity?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.

Why does lightning travel from clouds to the ground?