Lily build and orange shelf and a brown shelf to hang in her room the orange shelf is 5 feet 6inches long the brown shelf is twice as long what is the length of the brown shelf

3(10x-y)-5(x-y^2) need this solved asap

Icould really use some with this question.

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