Does the graph above show a relation, function, both a relation and a function, or neither a relation nor a function?

Me because some of question i don’t understand

Joel wants to buy a new tablet computer fram a store having a 20% off sale on all tablets. the tablet he wants has an original cost of $190. he also wants to make sure he has enough money to pay the 5% sales tax. part one joel uses the incorect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of $144.40. describe his error and write the correct expression part two how much will joel pay for the tablet show your work if you answer this question correctly you will receive a prize of 99 points good luck

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?