What is the multiplicative rate of change for the exponential function f(x)= 2(5/2)^-x?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Which representation has a constant of variation of -2.5

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