You learned in chapter 3.4 that the variance of a multiple play game increases as the number of lines played increases. The variance of a single play game is lower than the variance of a three play game. The variance of a five play game is higher than the variance of a three play game, and so on. In this section you will find out specific bankroll sizes for a couple of games at a different number plays for each game.
A straight is a hand with consecutive ranks, like 9? 7? 10? 8? 6?.  Notice again that the cards don't have to appear in order.  The order of face cards, from lowest to highest, is Jack, Queen, King, Ace, which we abbreviate J, Q, K, A.  An ace can also count as 1, to complete a straight where the other cards are 2, 3, 4, and 5.  But it can't count as both a low and a high card, e.g., Q K A 2 3.