1. Express the rate 40 students to 8 teachers as a unit rate. A. 5 students per teacher B. 10 students per teacher C. 4 students per teacher D. 12 students per teacher Hint 2. Solve A. 3 B. 2.5 C. 3.5 D. 4 Hint 3. Determine whether the triangles are similar. If not, explain why not. A. no, b = 110 B. no, b = 40 C. yes D. no, a = 30 Hint 4. Similar triangles must have the same ______. A. size and shape B. shape C. right angles D. size Hint 5. The average human heart beats 72 times in 60 seconds. How many times does it beat in 45 seconds? A. 84 times B. 54 times C. 30 times D. 96 times Hint 6. A stop sign casts a shadow 8 meters long, while a bush nearby casts a shadow 4.5 meters long. If the stop sign is 3.2 meters high, how tall is the bush? A. 4.3 meters B. 5.7 meters C. 1.8 meters D. 11.3 meters Hint 7. A guy wire is attached to the top of a telephone pole and goes to the ground 8 feet from the base. When Jim stands under the guy wire so that his head touches it, he is 3 feet from where the wire goes into the ground. If Jim is 6 feet tall, how tall is the telephone pole? A. 12 feet B. 24 feet C. 20 feet D. 16 feet Hint 8. On a map with a scale of 1 inch = 80 miles, the distance between two towns is 4 inches. If a person travels 65 miles per hour, how long will it take to travel from one town to the other? A. about 4 hours and 55 minutes B. about 12 hours and 30 minutes C. about 5 hours and 20 minutes D. about 16 hours and 15 minutes Hint 9. The process of enlarging or reducing an image is called a(n) A. illusion B. dilation C. scale factor D. image Hint 10. Express \$120.00 over 15 hours as a unit rate. A. \$12.50 per hour B. \$10.00 per hour C. \$13.00 per hour D. \$8.00 per hour Hint 11. On a map, the scale is inch = 300 miles. Find the actual distance between two cities that have a map distance of 5 inches. A. 3,000 miles B. 3,300 miles C. 1,650 miles D. 2,727 miles Hint 12. A projector displays an image from 25-millimeter film onto a screen that is 3.5 meters wide. What is the scale factor? A. B. C. D. Hint 13. The table shows the amount of snow during a snow storm. Find the rate of change in the amount of snow from 2:30 to 4:30. A. 0.33 inch per hour B. 0.67 inch per hour C. 0.80 inch per hour D. 0.75 inch per hour Hint 14. The graph shows the population of Washington, D.C. Find the rate of change in population of Washington, D.C. from 1990 to 2000. A. -3,500 people per year B. -3,100 people per year C. -3,300 people per year D. -3,400 people per year Hint 15. The points given in the table lie on a line. Find the slope of the line. A. B. C. - D. - Hint 16. The points given in the table lie on a line. Find the slope of the line. A. B. C. - D. - Hint