Melissa has ridden 51 miles of a bike course they course is 60 miles long what percentage of the course has melissa ridden so far

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

I'm confused on this could anyone me and show me what i need to do to solve it.