Visualization Without using your ruler, sketch a segment with the given length. Use your ruler to see how well your sketch approximates the length provided.

30. 3 cm
31. 3 in.
32. 6 in.
33. 10 cm
34. 65 mm

35. Think About a Plan The numbers labeled on the map of Florida are mile markers. Assume that Route 10 between Quincy and Jacksonville is straight.

    

    Suppose you drive at an average speed of 55 mi/h. How long will it take to get from Live Oak to Jacksonville?

    • How can you use mile markers to find distances between points?
    • How do average speed, distance, and time all relate to each other?
36. Travel Use the map above. Suppose you drive at an average speed of 58 mi/h. How long will it take to get from Macclenny to Tallahassee?

Error Analysis Use the highway sign for Exercises 37 and 38.

37. A driver reads the highway sign and says, “It's 145 miles from Mitchell to Watertown.” What error did the driver make? Explain.

    

38. Your friend reads the highway sign and says, “It's 71 miles to Watertown.” Is your friend correct? Explain.

Algebra Use the diagram below for Exercises 39 and 40.

39. If A D = 12 eh d equals 12  and A C = 4 y − 36 , eh c equals 4 y minus 36 comma  find the value of y. Then find AC and DC.

40. If E D = x + 4 e d equals x plus 4  and D B = 3 x − 8 , d b equals 3 x minus 8 comma  find ED, DB, and EB.
41. Writing Suppose you know PQ and QR. Can you use the Segment Addition Postulate to find PR? Explain.

C Challenge

42. C is the midpoint of A B ¯ , eh b bar , comma  D is the midpoint of A C ¯ , eh c bar , comma  E is the midpoint of A D ¯ , eh d bar , comma  F is the midpoint of E D ¯ , e d bar , comma  G is the midpoint of E F ¯ , e f bar , comma  and H is the midpoint of D B ¯ . d b bar , .  If D C = 16 , d c equals 16 comma  what is GH?

43. 1. Algebra Use the diagram below. What algebraic expression represents GK?

       

    2. If G K = 30 , g k equals 30 comma  what are GH and JK?

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