Determine which elementary row operation was oerformed, zoom in to see, first question

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.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?