The y-values change 6 units every time the x-values change 1 unit, on this interval. Finding average rate of change from a graph. Function g (x) is shown in the graph at the right.
It's 5 over 9 because you start off with 10 cards (6 roses 4 daisies) then you pick a rose. Then it become's 5 over 9 since there are only 5 roses left and 9 total cards left.