There are three viable ways to play this hand: keep the low pair, keep the three to the royal, or keep the four to the flush. Some beginners might also suggest keeping the low pair with the ace kicker. In real draw poker, you sometimes should keep a kicker, but NEVER in video poker. In this case, we can see the low pair is listed 9th, the three to the royal is listed 7th, and 4 to a flush comes in at 8th. The three to the royal is listed highest of the three, making it the best play.
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.
This is to answer some of the previous reviewer's questions. The listing of the 5c Deuces Wild machines in vpFREE2.com at the Horseshoe Bossier City says they are on 50 play machines not progressives. Also according to the Comments section, they were just added four months ago. If you have any more questions, someone on the vpFREE Louisiana Yahoo Group may be able to answer them.
The don'ts are mainly related to making sure you do not end up losing more than you can afford when playing. If you have lost your daily budget it is important to call it quits for the day. Chasing your losses is a bad idea as it can lead to even more losses. You should also avoid drinking too many alcoholic beverages as this can lead to making strategy mistakes and bad decisions.
Stick to the proper way of how to play video poker as well as video poker strategy and you won't necessarily be able to become a professional video poker player, but if you're looking for the one casino game besides traditional poker where you can get positive expected value, or at least a very low house advantage giving you hours of play for a very small investment, video poker may be your game. 
Here's where our strategy list comes in.  Notice that a low pair is #9, while four to an outside straight is #10.  The low pair is higher on the list, so we hold the pair.  In fact, you almost always hold pairs in Jacks or Better.  We'll discuss exceptions below, but in general, always lunge for a pair, and then do a quick check to see if you have anything better, since you probably won't.
For those who are willing to learn these games, it is well worth taking the time to understand video poker strategy. Many of these machines offer the best return to players (RTP) of virtually all of the casino games that are available online. In fact, when played in real world casinos, video poker games are the only ones where players who play perfect strategy can have a positive expectation. This does not include players who card count in blackjack.
Pick a game. There are dozens of different video-poker games in casinos. Different games will have different rate of returns, meaning some games, if you win, will give you a higher percentage of your money back and others will give you a lower percentage. A "9/6 Jacks or Better" paytable is the best because the rate of return is 99.54%, meaning the casino only keeps .46% of your money.[1]
Once I hit two 4 of a Kinds back to back.  The probability of hitting it once is 0.24%.  The chances of hitting it back to back are 0.24%2 = 0.0006%, or 1 in 179,000.  That's four times less likely than hitting a royal flush.  And I would have preferred the royal!  (By the way, purists will note that after you've hit a 4 of a Kind, the chances of hitting another four of a kind is just 0.24%, not 0.0006%, but I'm considering the probability of getting two back-to-back before I get the first one.) 

Online gambling is largely unregulated in the U.S.  That means the casinos serving U.S. players generally don't answer to anyone.  If you have a problem with a casino (like they won't pay you), then you're usually out of luck.  I can't count how many players have written to ask me for help because they didn't get paid by some other casino.  (Not that I helped them—if a dodgy casino won't pay you then you're on your own.)
So far we have looked at low variance and moderate variance video poker games. Low variance games have the advantage of a smaller bankroll size requirement and relatively simple video poker strategy. This comes at the cost of playing a somewhat boring game. Moderate variance video poker games are more exciting to play because they have more high paying winning hands. The excitement factor is offset, however, by higher bankroll requirements and somewhat more complex playing strategy.
Obviously, the more you bet, the more you will win for any given hand. With one exception, the win for any given hand and bet is proportional to the amount bet. However, notice that for a royal flush the win is 1000 for a bet of four coins and 4000 for a bet of 5 coins. The disproportionately high payoff of 800 per coin bet for a royal flush, with a five coins bet, is what economists would call an economy of scale. You will see this in almost every video poker game. If you don't bet the maximum number of coins, the cost of being short-changed on a royal amounts to about 2% of money bet, which is a lot. The wise video poker player will always bet max coins per hand.
So it really pays to hunt out the good machines!  But it's actually pretty easy, because the readers of a website called VPFree2 scout out the best machines and post their locations on the site.  Using that site you can see that you can there are 9/6 Jacks or Better machines on the Strip at Cosmopolitan, New York New York, Riviera, Treasure Island, and others.  And in downtown and off-strip casinos, the good games are more common, and available at lower denominations. 
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