please solve all the parts, thank you.

Select Function Set 2, f(x) = vx and g(x) =x - 4, and check both Display (fog)(x) and (g of)(x) check boxes. Complete parts 1 through 3 below. Use the interactive figure to find your answer. Use the left and right arrow keys to move along a slider as needed. Click here to launch the interactive figure. Part 1: What is the domain of f(x)? The domain of f(x) is (Type your answer in interval notation.)