If the bird is jumping from one perch to another continuously then your bird is restless. You should immediately pay attention because something is bothering your bird and it is trying to communicate with you. Birds also tend to show this behavior when they are seeking attention or just want to come out of the cage. If this behavior is accompanied by clicks and vocalization, such as loud chattering, more often than not, your bird wants to play with you and is demanding your attention. If the bird remains still and its feathers are tightly packed close to the body, your bird has spotted some danger. It is trying to remain as still as possible to avoid being spotted. Birds have a lot of natural enemies and they exhibit this behavior to escape unwanted attention. Birds tend to fix their eyes on the source of the danger. Watch the bird closely. It is trying to warn you and point you to the source of the threat. Do not pick or move your bird while it is exhibiting these behaviors. If your bird is looking outside the window, close the window blinds and then go to your bird to comfort it. Your bird could feel threatened by anything, including a new couch or a new lamp in your living room. To find out if your bird associates danger with a new article in the room, walk towards the article and then stay there for a minute. Touch the new article and be relaxed. Birds will quickly learn there is no reason to be worried. Your bird may be trying to show its dominance if it raises its head and perches above your eye level. It may also begin to "growl" to show its aggression. This behavior may occur if your bird feels threatened or protective due to having strangers in the room or a person nearby that your bird is not fond of.
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One-sentence summary -- Look for restlessness. Notice signs that your bird has spotted danger. Identify signs of aggression.

You'll need to measure the fullest part of your bust to get the proper measurement. Make sure that the measuring tape (a dress maker's soft tape measure for preference) goes under your arms. Keep the measuring tape snug but not too tight. If you do it too tight (if your bust is popping out over the tape) then you'll get the wrong measurements and your dress won't fit properly. Bend to one side (doesn't matter which) and find your waist's natural crease. At the crease, measure around your waist, making sure that the measuring tape is a bit loose. You can also find your natural waist by measuring 2 inches up from your belly button. It's usually the smallest part of your waistline. Stand with your feet together. Measure around the fullest part of your hips and rear. This is typically midway between your crotch and your belly button. Again you'll want to keep the measuring tape somewhat loose, so that your dress size doesn't end up being too small. Keep in mind that size charts tend to be different for different stores and that even with your measurements and the size chart, you may be surprised by the wide array of sizes you will seem to fit into. However, you can use this size chart as a basic guide. Always choose the larger size if your measurements come between two sizes, especially if you're ordering online. Avoid the dress size generators, as they tend to give you the wrong sizes. Dress size generators claim to be able to tell you your dress size in each store (since so many stores size their women's clothing differently). If you are looking at European sizes, you'll want to check out this chart, which converts American sizes into European sizes. Some stores don't use the typical 6, 8, 10, 12. Instead they use letters like XS, S, M, etc. Fortunately these letter sizes tend to correspond to specific numerical sizes and you can figure your size out based on that. In American Sizes; Size 2 is XS, Size 4 is S, Size 6 is M, Size 8 is L, Size 10 is XL, Size 12 is XXL. This is what it usually is, although sizes may still vary depending on the store.
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One-sentence summary -- Measure your bust. Measure your waist. Measure your hips. Look at a size chart. Convert numbers to letters for sizing.

Equations with two variables factor differently than basic quadratics. For any equation a2-b2 where a and b do not equal 0, the equation factors to (a+b)(a-b). For example, the equation 9x2 - 4y2 = (3x + 2y)(3x - 2y). Note that, If the trinomial is in the form a2-2ab+b2, the factored form is slightly different: (a-b)2. The equation 4x2 + 8xy + 4y2 can be re-written as 4x2 + (2 2 2)xy + 4y2. We can now see that it's in the correct form, so we can say with confidence that our equation factors to (2x + 2y)2 Finally, it bears mentioning that cubics and even higher-order equations can be factored, though the factoring process quickly becomes prohibitively complicated. For instance, 8x3 - 27y3 factors to (2x - 3y)(4x2 + ((2x)(3y)) + 9y2)
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One-sentence summary -- If the equation is in the form a2-b2, factor it to (a+b)(a-b). If the equation is in the form a2+2ab+b2, factor it to (a+b)2. If the equation is in the form a3-b3, factor it to (a-b)(a2+ab+b2).

Double service courts are wider, but shorter than single service courts. The basic court lines for badminton doubles are: The center line. This is the line that runs perpendicular to the net and runs down the middle of each side. It separates the two service boxes. The doubles side lines. These are the outermost lines that run perpendicular to the net. The short service line. This is the line closest to the net, and runs parallel to the net. The line covers the width of the court. The doubles long service line. This is the second to last line near the back of the court. It is parallel to the net, and spans the width of the court. An attacking formation is the ideal formation for you and your badminton teammate. An attacking formation is when one player is in the front of the court (usually the server assumes this position), and one player is in the back of the court, i.e., the defensive player. The defensive player usually stands right behind the setter. The setter, i.e., the front player, secures the net position by forcing their opponent to lift the ball. They also intercept a short defense or shot with a smash. The defensive player, i.e., the back player, usually fires powerful shots, like smashes, from the back of the court. A defensive formation is when both players stand side by side covering their respective sides. It is the weaker formation of the two. It usually occurs when you or your teammate execute a high lift or high clear, which is a weak return. A high lift or high clear sets your opponents up to smash or net the ball, and thus, win a rally.
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One-sentence summary --
Familiarize yourself with the court lines. Get into an attacking formation. Assume a defensive formation.