Ihave a table here that i don't quite understand
x 0 1 2 3 4 5
p(x) 0.237 0.396 0.264 0.088 0.015 0.001
x= # of prisons out of 5 on parole who become repeat offenders.
what is p(x)? and why does it add up to 1?

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Which of these tables represents a non-linear function?