What type of plant is it?

It's a ZZ plant (Zamioculcas zamifoila). I often answer Qs abt them, but I haven't know what to say. Either we don't currently have others who grow this or they don't what to say either.

How abt a pix of the ENTIRE plant pls w/ your hand on it to show scale (size)?

1. These are succulents, the stems act as some kind of water storage organ. Since they are a regular part of this plant's development when maturing, I figure the plant grows them for some reason; it has use for them, so I leave them alone. Plants I've grown over yrs. from single leaves don't have this, they develop as the plants age & they their stems thicken over time.
2. Watering depends on multiple variables, so I can't say how often you SHOULD water it. What kind of soil, how much light it gets, etc. I water mine APPROX every 7-10 days (or when I remember).
3. That mix doesn't look good to me & if you haven't repotted it in yrs., it's likely spent & worth repotting.

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=d179

Pls note the above link is from a Botanical Garden, not questionable info. from YouTube. (I couldn't include it in above post, 'cause it kept changing the paragraph numbering.)

Two other threads I posted abt these plants. Should keep you busy for a while. Enjoy!

https://www.gardenweb.com/discussions/5652914/a-zz-plant-propagation-to-share#n=9

This 2nd thread, tho' long, also discusses what kind of mixes I use.

https://www.gardenweb.com/discussions/5795861/zz-plant-rescue#n=91