Answer:
yes they are all functions
Step-by-step explanation:
Despite f(x) being the classic way to write a function,
a function has:
- an input (domain)
- a relationship (maps to)
- an output (range)
A function relates each element of a set with exactly one element of another (possibly the same) set.
One-to-one and many-to-one are functions, but one-to-many is not a function.
You can also carry out the Vertical Line Test on a graph. If the vertical line only crosses the curve once, it is a function. If it crosses more than once it is still a valid curve, but is not a function.
