Identify the property that justifies each step asked about in the answer area below. Line 1: (2x + 9) + 5x

Line 2: (9 + 2x) + 5x

Line 3: 9+ (2x + 5x)

Line 4: 9 + 7x

Line 1 to Line 2:

Line 2 to Line 3:

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expressions 4s +9s represents the total number of items that will be displayed on s shelves. simplify this expression

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online