Pls Help ASAP The Tran family went to eat at Cheesecake Factory. The bill was $125. They want to leave a 15% tip. How much should they leave for tip? Round your answer to the nearest cent if necessary. (Hint: Find 15% of $125)

Let x have probability generating function gx (s) and let un generating function u(s) of the sequence uo, u1, satisfies p(x > n). show that the (1- s)u(s) = 1 - gx(s), whenever the series defining these generating functions converge.