How does the human body naturally create negative ions?

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.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.