Determine the slope on the graph

What are the domain and range of the function? f(x) = -4 (sqrt)x

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

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account