Question

The graph below shows three functions:

Which function has all real numbers as its domain? (1 point) Only p(x) Only f(x) Both f(x) and g(x) Both g(x) and p(x)

Answer 1

Answer: Only f(x), which is the red curve

The red curve extends infinitely in both directions left and right. Plugging any x value into the f(x) function leads to some corresponding y value. The other functions g(x) and p(x) have restricted domains. For instance, x = 4 would not work for g(x) or p(x), but it works for f(x).