See Problem 5.

Write a rule in words and as an algebraic expression to model the relationship in each table.

39. Sightseeing While on vacation, you rent a bicycle. You pay $9 for each hour you use it. It costs $5 to rent a helmet while you use the bicycle.

    Bike Rental

    Number of Hours	Rental Cost
    1	( $ 9 × 1 ) + $ 5 open dollars 9 times 1 close plus dollars 5
    2	( $ 9 × 2 ) + $ 5 open dollars 9 times 2 close plus dollars 5
    3	( $ 9 × 3 ) + $ 5 open dollars 9 times 3 close plus dollars 5
    n	_______

40. Sales At a shoe store, a salesperson earns a weekly salary of $150. A salesperson is also paid $2.00 for each pair of shoes he or she sells during the week.

    Shoe Sales

    Pairs of Shoes Sold	Total Earned
    5	$ 150 + ( $ 2 × 5 ) dollars 150 plus open dollars 2 times 5 close
    10	$ 150 + ( $ 2 × 10 ) dollars 150 plus open dollars 2 times 10 close
    15	$ 150 + ( $ 2 × 15 ) dollars 150 plus open dollars 2 times 15 close
    n	□ white square

B Apply

Write an algebraic expression for each word phrase.

41. 8 minus the product of 9 and r
42. the sum of 15 and x, plus 7
43. 4 less than three sevenths of y
44. the quotient of 12 and the product of 5 and t
45. Error Analysis A student writes the word phrase “the quotient of n and 5” to describe the expression 5 n . 5 over n , .  Describe and correct the student's error.
46. Think About a Plan The table below shows the number of bagels a shop gives you per “baker's dozen.” Write an algebraic expression that gives the rule for finding the number of bagels in any number b of baker's dozens.

    Bagels

    Baker's Dozens	Number of Bagels
    1	13
    2	26
    3	39
    b	□ white square

    • What is the pattern of increase in the number of bagels?
    • What operation can you perform on b to find the number of bagels?
47. Tickets You and some friends are going to a museum. Each ticket costs $4.50. Write an algebraic expression that gives the rule for finding the cost of any number t of tickets.
48. Volunteering Serena and Tyler are wrapping gift boxes at the same pace. Serena starts first, as shown in the diagram. Write an algebraic expression that represents the number of boxes Tyler will have wrapped when Serena has wrapped x boxes.

    

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