First, It's a function.
Second, domain is {a,b,c,d}
Third, range is {x,y,z}
Reason why it's function because
1. A single value in Input doesn't have 2 lines connected (domain must not be repetitive.)
2. All Inputs have lines connected to Output (if not then not a function.)
1. ) 0.8 2.) 8/10 3.)8 tenths plus 8 hundredths. 4.) 8.8
