Final answer:
The range of the function f(x)=2x - 3 when the domain is (-9,-3.1) is calculated by plugging the endpoints of the domain into the function, resulting in a range of (-21, -9.2).
Step-by-step explanation:
The range of the function f(x)=2x - 3 when the domain is (-9,-3.1) can be found by evaluating the function at the endpoints of the domain. For the lower end, when x = -9, f(-9) = 2(-9) - 3 = -18 - 3 = -21. For the upper end, when x = -3.1, f(-3.1) = 2(-3.1) - 3 = -6.2 - 3 = -9.2. Therefore, the range of the function within the given domain is (-21, -9.2).