Question

True or false a function is a preset formula that performs a calculation?

Answer 1

Hmm.   Certainly a preset formula that takes an input, performs a calculation, and produces an output is a function.

But other things might be functions as well.  Being a function doesn't require an algorithm or preset formula, just some way of describing a single output for every input in the domain.  A table would be another way to specify a function.  Sometimes we know something's a function but we don't know how to calculate it.

So I'm not sure really what they're after in this question, but I'm going to say FALSE.