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Plugable USB C to HDMI Multiport Adapter, 3-in-1 USB C Hub with 4K HDMI Output, USB 3.0 and USB-C Charging Port, Compatible with MacBook, Chromebook, Dell XPS, Thunderbolt 3 and More :
How to connect a Chromebook to a monitor - Android Authority
How to use the USB-C of your Chromebook to connect to HDMI