Which is an exponential decay function?
f(x)=3/4(7/4)^x
f(x)=2/3(4/5)^-x
f(x)=3/2(8/7)^-x
f(x)=1/3(-9/2)^x

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.