Which equations model exponential decay?
select each correct answer.

a. y=0.55(0.91)^x

b. y=4.2(1.25)^x

c. y=0.25(2)^x

d. y=2(0.20)^x

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.