tailieunhanh - Solve prpblem sat 5

Tham khảo tài liệu 'solve prpblem sat 5', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | --------------------------------------- PRACTICE TEST 2 15. If 40 of j is equal to 50 of k then j is a. 10 larger than k. b. 15 larger than k. c. 20 larger than k. d. 25 larger than k. e. 80 larger than k. 16. In the diagram above FDCB is a rectangle. Line ED is six units long line AB is ten units long and the measure of angle ECD is 60 degrees. What is the length of line AE a. 8 V3 b. 2 c. 20 d. 20 - e. 20 - 4V3 214 PRACTICE TEST 2 Answer Key Section 1 Answers 1. b. Substitute 6 for m y--4 6 10 -y- 24 10 12 - 14 -2. 2. b. The midpoint of a line is equal to the average of the x- and -coordinates of its endpoints. The average of the x-coordinates -22 8 6 3. The average of the -coordinates -82 0 -y -4. The midpoint of this line is at 3 -4 . 3. e. If4x 5 15 then 4x 10 and x . Substi- tute for x in the second equation 10 5 25 5 30. 4. e. To find the total number of different guitars that are offered multiply the number of neck choices by the number of body choices by the number of color choices 4 2 6 48 different guitars. 5. c. The set of positive factors of 12 is 1 2 3 4 6 12 . All ofthe even numbers 2 4 6 and 12 are multiples of 2. The only positive factors of 12 that are not multiples of 2 are 1 and 3. 6. b. Be careful the question asks you for the num- ber of values of f 3 not f x 3. In other words how many values can be generated when x 3 If the line x 3 is drawn on the graph it passes through only one point. There is only one value for f 3 . 7. d. Factor the numerator and denominator of the fraction x2 5x x x 5 x3 - 25x x x 5 x - 5 There is an x term and an x 5 term in both the numerator and denominator. Cancel those terms leaving the fraction x s. 8. c. The equation of a parabola with its turning point c units to the left of the -axis is written as x c 2. The equation of a parabola with its turning point d units above the x-axis is written as x2 d. The vertex of the parabola formed by the equation x 1 2 2 is found one unit to the left of the -axis and