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Tham khảo tài liệu 'sat - mc grawhill part 71', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 690 MCGRAW-HILL S SAT 8. A You are told that 12v 3w Divide by 3 4v w Multiply by 2 8v 2w The question asks for the value of 2w - 8v Substitute for 2w 8v - 8v 0 Alternatively you can try finding values for v and w that work like 1 and 4 and plug them into 2w - 8v and into the choices and find the match. Chapter 8 Lesson 1 Solving Equations 9. C 2 x 1 5 Subtract 1 2 x 4 Divide by 2 x 2 Interpret the absolute value x 2 OR x -2 You are told that x is negative so x -2 is the answer. Chapter 8 Lesson 6 Inequalities Absolute Values and Plugging In 10. B -x2 - 8x - 5 Substitute -2 for x - -2 2 - 8 -2 - 5 Square -2 - 4 - 8 -2 - 5 Simplify -4 16 - 5 7 When evaluating -x2 don t forget to square the value before taking its opposite Chapter 8 Lesson 1 Solving Equations 11. D 5 2 - -T m 3 Cross-multiply 15 2m Divide by 2 7.5 m Since m is greater than or equal to 7.5 D is the answer. Chapter 8 Lesson 6 Inequalities Absolute Values and Plugging In 12. B First find the price after the 6 sales tax 60.00 X .06 3.60 tax 60.00 3.60 63.60 price with tax A simpler way is just to multiply 60 by 1.06. Now find how much change Theo received 70.00 - 63.60 6.40 change Chapter 7 Lesson 5 Percents 13. A Write an equation for the first sentence. n - m r Because none of the answer choices contain m solve for m in terms of r and n n - m r Add m n r m Subtract r n - r m Now write an expression for what the question asks for s 2m Substitute for m s 2 n - r Distribute s 2n - 2r Alternatively you can substitute numbers for n m and r making sure they work and get a numerical answer to the question. Chapter 8 Lesson 1 Solving Equations 14. D Two points on line l are 0 0 and 10 y . Find the slope of the line y2-yi y-0 y _ 3 m -f- -f -f x2 - x1 10 - 0 10 5 Cross-multiply 5y 30 Divide by 5 y 6 Since y 6 the height of the triangle is 6. Find the area A 1 base height Substitute 48 for A 48 base 6 Simplify 48 3 base Divide by 3 16 base x Now find x y 16 6 22. Chapter 10 Lesson 4 Coordinate Geometry 15. A .