tailieunhanh - sat virtual reality ii explanations phần 1

Tham khảo tài liệu 'sat virtual reality ii explanations phần 1', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SAT SeCtlOnltMatn Virtual Reality II 1 1. A Here we have a basic algebra question. The important thing to remember here is that when solving an algebraic equation you have to do the same thing to both sides of the equation. You re given an equation with 4x 2 on the left side of the equal sign and the question stem asks about 4x 8. What do you have to do to 4x 2 to make it look like 4x 8 Right just add 6. But since you ve added 6 to the left side of the equation you have to add 6 to the right side of the equation also since you have to dO the same thing to both SiDeS Adding 6 to the right side of the equation gives you 26 6 or 32 answer choice A . A more mathematical way of expressing what we just did is to write it out like this 4x 2 26 6 6 4x 8 32 2. E You have to know a few facts about geometry here and if you don t you might want to do some review in your Math Reference Book. First you have to know that the word bisects means cuts in half. So if line EX bisects angle BXD it cuts angle BXD into two equal halves. The diagram shows that angle BXE is 30 and since it is half of angle BXD angle BXD must equal 60 . Now that we ve found the degree measure of angle BXD we can find the degree measure of angle CXB. Angles CXB and BXD are supplementary angles because they from line segment CXD. So angle CXB plus angle BXD equals 180 . Since angle BXD is 60 angle CXB equals180 - 60 or 120 . Even if you ve forgotten most of what you ever learned about geometry you can eliminate two answer choices by just eyeballing the figure. Figures are drawn to scale on the SAT so you can assume that the angle measurement is about what it looks like. You should know what a 90-degree angle looks like the corner of this piece of paper. Angle CXB in the figure is clearly greater than 90 so choices A and B can be eliminated. So you could guess among answer choices C D and E . 3. C Here you have to know an important concept that appears fairly often on the SAT that when two quantities .

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