See Problem 4.

18. Composite Figures Use the diagram of the backpack below.
    

    

    1. What two figures approximate the shape of the backpack?
    2. What is the volume of the backpack in terms of π?
    3. What is the volume of the backpack to the nearest cubic inch?

Find the volume of each composite space figure to the nearest whole number.

19. 
    Image Long Description
20. 

B Apply

21. Think About a Plan A full waterbed mattress is 7 ft by 4 ft by 1 ft. If water weighs

    62.4  lb /f t 3 , 62.4 . lbslashf . t cubed , comma  what is the weight of the water in the mattress to the nearest pound?

    • How can you determine the amount of water the mattress can hold?
    • The weight of the water is in pounds per cubic feet. How can you get an answer with a unit of pounds?
22. Open-Ended Give the dimensions of two rectangular prisms that have volumes of 80 cm 3 80 , cm cubed  each but also have different surface areas.

Find the height of each figure with the given volume.

23. 

    V = 3240 π cm 3 v equals , 3240 . pi , cm cubed

24. 

    V = 125  in . 3 v equals . 125 , in , . cubed

25. 

    V = 27 f t 3 v equals 27 , f , t cubed

26. Sports A can of tennis balls has a diameter of 3 in. and a height of 8 in. Find the volume of the can to the nearest cubic inch.

27. What is the volume of the oblique prism shown below?

    

28. Environmental Engineering A scientist suggests keeping indoor air relatively clean as follows: For a room with a ceiling 8 ft high, provide two or three pots of flowers for every 100 f t 2 100 f , t squared  of floor space. If your classroom has an 8-ft ceiling and measures 35 ft by 40 ft, how many pots of flowers should it have?
29. Reasoning Suppose the dimensions of a prism are tripled. How does this affect its volume? Explain.

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