a. The domain of a function is the set of all possible values that the independent variable can take.
In this case, the independent variable is human years which takes values between 1 and 7, then the domain of the function is [1, 7].
b. The range of a function is the set of all possible values that the dependent variable can take.
In this case, the dependent variable is dog years which takes values between 15 and 44, then the range of the function is [15, 44].