The answers X2 plus 4X -21This is because it’s possible
It would be A. R= 50 +10m
The input is the cost or the amount of money Mr. Edward has to pay in order to park. The output is the parking space allotted for every hour that the car is parked.
It could also be that the input is the effort Mr. Edward put in asking for the cost while the output is the information needed by Mr. Edward - the cost of parking per hour.
I’m pretty sure this is how you do these kinds of questions, but I may be entirely wrong, so don’t 100% trust me on this one
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