A:AnswerYes, it has a mini display port and a HDMI port, just buy the correct cable (Mini-Displayport or HDMI [I suggest display port]) and connect the two.
A:AnswerGood Evening,
I don't believe so. Unlike other laptops, that have both integrated graphics for the main display and an aftermarket solution (AMD or nVidia) for an external display, this laptop appears to be use the onboard, integrated graphics at all times.
A:AnswerIt seems to be 73 Wh, since the battery is listed as being 4-cell for this model and HP's website lists two batteries: a 4-cell 73 Wh and a 6-cell 80 Wh for the laptop.