10. The graph gives the data points from an 10 experiment involving oxygen and hydrogen. Which of the following best approximates the equation, with oxygen as a function of hydrogen: O = m H + b (A) O= .625 H + 0.75 (B) O = 1.6 H - 1.2 Oxygen in milligrams Co 6 A N (C) O =.625 H - 1.2 (D) O = 4.0 H + 4.2 0 1 2 3 4 5 6 7 8 9 10 (E) O =7.0 H + 10.0 Hydrogen in milligrams 1 1. The number of science books checked out at the school library is directly proportional to the number of students in Physics class. If 42 books were checked out when 6 students were in physics class, how many books were checked out when there were 1 1 students in the class ? (A) 66 books (B) 47 books (C) 53 books (D) 77 books (E) none of these 12. The number of yearly traffic accidents on Main St. varies inversely with the number of stop signs on Main St. 's intersections. If there were 10 accidents when the street had only 1 stop sign, how many stop signs in all must the street now have if there are only 2 accidents yearly ? (A) 2 (B) 4 (C) 5 (D) 20 (E) none of these 13. John has 50 liters of a 10% peroxide solution. How many liters of a 60% peroxide solution should he add to get a 28% peroxide solution ? (A) 28 liters (B) 15 liters (C) 88~ liters (D) 28- liters (E) none of these 14. Sarah has 16 pounds of soup that is 1/4 chicken broth. How much chicken broth must she add to increase the chicken broth content to 1/3 ? (A) 1 pound (B) 4 pounds (C) 1- pounds (D) 2 pounds (E) none of these15. Mr. Meyer entered the subway at High St. Station and traveled 16 miles on a heading of 165 (measured counterclockwise from reference of 0' for due east), then changed Station ? lines and traveled 25 miles on a heading of 70. How far was he now from High St. (A) 27.6 mi N, 24 mi E (B) 27.6 mi N, 6.9 mi W (C) 25 mi N, 16 mi W (D) 28.45 mi N (E) none of these 16. Add 17 260 and 82220 (A) 24.67253.63 (B) 9.9276.10 C) 25/280 (D) 10_13.90 (E) none of these 17. Simplify: b 7 + a 3+ 2a X (A) b + 4ax + 3bx (B) 3b + 4ab + 7ax b +7x a 2a + 3a (C) 3 (a + x ) (D) 2ab + 7ax + 3bx 2a" + 3ax (E) none of these 18. 217 - 14 + 2V-3V-12+ 30-4 (A) -19 -27 (B) -13 +47 (C) 11+47 (D) -11-8/ (E) none of these 19. Simplify: 3/12V12 IN (A) 123 IN (B) 2(33 ) (C) 2V3 (D) /12 (E) none of these 20. If: -3z+6 2- 12, then 4z2 + 2z +50= 3 5 (A) 650 (B) 700 (C) 750 (D) 800 (E) none of these