Answer:
3 months
Step-by-step explanation:
you have to check when the two lines intercept
Watching the graph you can see that it happens after 3 months
I would say all of them can be model as functions.
<span>model number:
This would be a onto function, meaning that the outputs are not unique.
f(model_1) = f(model_2) = computer_type.
</span><span>part number:
</span>This would mean the function takes in multiple parameters.
f(part_1, part_2, part_3, ...) = computer
<span>serial number:
This is the most obvious one; an one-to-one function:
f(s_num_1) = computer_1;
f(s_num_2) = computer_2;</span>
The answer would be 36:18 and done