Good morning and night. Can anyone help me on this question? I'm stuck on this question for khan that I need to master.

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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

What is the slope of the line (-7,2) (4,6)