Which of the following equations represents a graph that decreases?
a. y=4(1.5^x)
b. y=1.5(2^x)
c. y=3(2^x)
d. y=2(0.1^x)

Neal buys a board game. he pays for the board game and pays $1.54 in sales tax. the sales tax rate is 5.5%. what is the original price of the board game, before tax