tailieunhanh - Geomegy review 10

Tham khảo tài liệu 'geomegy review 10', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | --------------------------------------- PRACTICE TEST 1 --------------------------------------------- 13. Melissa runs the 50-yard dash five times with times of seconds seconds seconds seconds and seconds. If she runs a sixth dash which of the following would change the mean and mode of her scores but not the median a. seconds b. seconds c. seconds d. seconds e. seconds 14. If x 0 and y 0 y xy x a. y 1. b. y x. c. x y. d. 2xy. e. y2 x. 15. 20 _ o__. 15 Speed . km h 1OE z 5 . 0 5 10 15 20 Time sec The scatterplot above shows the speeds of different runners over time. Which of the following could be the equation of the line of best fit a. 5 -2 t-15 b. 5 -t 25 c. 5 --1y t - 10 d. 5 -y t 20 e. 5 2 t 15 189 PRACTICE TEST 1 16. 5 m The radius of the outer circle shown above is times greater than the radius of the inner circle. What is the area of the shaded region a. 6n m2 b. 9n m2 c. 25n m2 d. 30n m2 e. 36n m2 190 PRACTICE TEST 1 Answer Key Section 1 Answers 1. a. Cross multiply and solve for x 3 2x 2 x x - 5 6x x2 - 3x - 10 x2 - 9x - 10 0 x - 10 x 1 0 x 10 x -1 2. b. Point B is the same distance from the y-axis as point A so the x-coordinate of point B is the same as the x-coordinate of point A -1. Point B is the same distance from the x-axis as point C so the y-coordinate of point B is the same as the y-coordinate of point C 4. The coordinates of point B are -1 4 . 3. e. Perpendicular lines have slopes that are negative reciprocals of each other. The slope of the line given is - . The negative reciprocal of 2 is -2. Every line with a slope of-2 is perpendicular to the given line y -2x 5 is perpendicular to y _ 2 c 3x - 5. 4. b. If r 30 30 of r 3 9. 9 is equal to 75 of 5. If 9 then 5 12. 50 of 5 12 6. 5. b. 30 men X 42 square feet 1 260 square feet of space 1 260 square feet 35 men 36 square feet 42 - 36 6 so each man will have 6 less square feet of space. 6. d. The order of the four songs is important. The