Can someone help me out please on algebra

What are the domain and range of f(x)=[1/5]x

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

Explain how you can use the associative property to evaluate (7x50)x4.