The quantity of an element is decaying over time such that the amount of material at any time is given by the function R(t)=4000(0.9)^t+1 write an equivalent function of the form R(t)=ab^t

Mahnoor randomly selects times to walk into a local restaurant and observe the type of music being played she found that the restaurant was playing country 11 times rock & roll 17 times and blues 8 times use the observed frequencies to create a probability model for the type of music the restaurant is playing the next time mahnoor walks in.