Tham khảo tài liệu 'barron's how to prepare for the sat 23rd edition (2008) _09', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 736 Six Model SAT Tests 5. E. At the regular price a CD costs d dollars so at 50 off it costs 2- dollars. To find 2 out how many you can buy divide the amount of money m by the price per CD 2 2m d d 2 m - m X 2 d horizontal find its length by subtracting the x-coordinates BC 6 - 1 5. Then area of AABC 2 3 5 y . 11. The perimeter of the quadrilateral in the figure is 30 5 7 8 10 . Then 4s 30 where s is a side of the square and s . Use TACTIC 6 plug in easy-to-use numbers. If a CD regularly costs 10 then on sale at 50 off they cost 5 each. How many can be purchased on sale for 20 The answer is 4. Which of the choices equals 4 when d 10 and m 20 2m Only -d 12. To produce 40 gizmos takes 40 X 333 13 320 seconds. Since there are 60 seconds in sga a minute and 60 minutes in an hour there are 60 X 60 3600 seconds in an hour 13 320 - 3600 hours. 13 320 seconds - 60 222 minutes and 222 minutes - 60 hours. 13. 145 Since the average of a b and 10 is 100 their sum is 300 TACTIC E1 . Then 6. C. f Í 1i 9f 11 92 9 3 . 12 I 12 I a b 10 300 a b 290 a b 2 290 2 145. 7. B. 2x2 - 8 2 x2 - 4 _ x2 - 4x 4 x - 2 x - 2 2Lx-2 x 2 2 x 2 Use TACTIC 6 plug in a number for x. For example if x 3 2x2 - 8 2 3 2 - 8 18 - 8 x2 - 4x 4 is 32 - 4 3 4 9 -12 4 10 10. Only choice B is 10 when x 3 2 3 2 2 5 3 - 2 1 . 8. C. Sequence I 2 4 6 8 10 . . The nth term is 2n so the 32nd term is 64. Sequence II 2 4 8 16 32 . . The nth term is 2n so the 32nd term is 232. Lly i 22 2 64 26 Grid-in Questions 9. 98 The easiest way is to simplify first a2 b2 - a2 - b2 2b2. Then 6 7 2 72 2 49 98. wa If you don t think to simplify or you can t just do the arithmetic 62 72 - 62 - 72 36 49 - 36 - 49 85 - -13 85 13 98. 10. Here AABC is a right triangle and its area . . 1 _ is given by 2 AB BC . Since AB is vertical find its length by subtracting the coordinates AB 4 - 1 3. Similarly since BC is Since 10 is 90 less than 100 then a and b together must be 90 more than 100 KEY FACT E3 . Assume
