HELP HELP HELP What is the explicit rule for the arithmetic sequence?

20.5, 18, 15.5, 13, 10.5, ...

an=23+2.5n

an=20.5−2.5n

an=20.5+2.5n

an=23−2.5n

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