After tennis practice, Wong places tennis balls into canisters. He can use up to 10 canisters, and he places exactly 3 tennis balls into each canister. The number of tennis balls placed into canisters is a function of the number of canisters.

Which statements are true regarding the domain and range of this function? Select all that apply.
A.
The domain of the function is all real numbers from 0 to 10.

B.
The domain of the function is all whole numbers from 0 to 10.

C.
The domain of the function is all whole numbers from 0 to 30.

D.
The range of the function is all multiples of 3 from 0 to 30.

E.
The range of the function is all whole numbers from 0 to 30.

1 answer

Let's analyze the situation step by step.

  1. Domain of the function: The domain is defined by the number of canisters Wong can use. Wong can use anywhere from 0 to 10 canisters. Therefore, the valid values for the number of canisters (the independent variable) are whole numbers from 0 to 10.

    • Statement A: False - The domain is not all real numbers, it's restricted to whole numbers.
    • Statement B: True - The domain consists of whole numbers from 0 to 10: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}.
    • Statement C: False - The domain does not include all whole numbers from 0 to 30; it only goes up to 10.
  2. Range of the function: The range is defined by the number of tennis balls placed into canisters. If Wong places 3 tennis balls in each canister, then for any number of canisters \( n \) (where \( n \) is in the domain of 0 to 10), the total number of tennis balls is given by \( 3n \).

    • If \( n = 0 \): 0 tennis balls
    • If \( n = 1 \): 3 tennis balls
    • If \( n = 2 \): 6 tennis balls
    • If \( n = 3 \): 9 tennis balls
    • If \( n = 4 \): 12 tennis balls
    • If \( n = 5 \): 15 tennis balls
    • If \( n = 6 \): 18 tennis balls
    • If \( n = 7 \): 21 tennis balls
    • If \( n = 8 \): 24 tennis balls
    • If \( n = 9 \): 27 tennis balls
    • If \( n = 10 \): 30 tennis balls

    The possible values for the total number of tennis balls are {0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30}, which are all multiples of 3 between 0 and 30.

    • Statement D: True - The range includes all multiples of 3 from 0 to 30.
    • Statement E: False - The range does not include all whole numbers from 0 to 30, but only specific multiples of 3.

Thus, the correct statements regarding the domain and range are:

  • B. The domain of the function is all whole numbers from 0 to 10.
  • D. The range of the function is all multiples of 3 from 0 to 30.