I need to know what question 3 and 4 is

Answer:3. (-∞, ∞), [0, ∞); The graph is a function 4. -5 Step-by-step explanation:Question 3 A. Domain The domain is the set of all possible x-values that will make the function work. x can take any value from -∞ to ∞ The domain is (-∞, ∞). B. Range The range is the spread of the y-values. We see from the graph that y can have any positive value. The range is [0, ∞). C. Test for function We can use the vertical line test to determine if the graph is that of a function. A function can only have one value of y for each value of x. We see that a vertical line from any point on the x-axis will intersect only one point on the graph. The graph is a function. Question 4 ƒ(x) = -2x+ 1 [tex]\begin{array}{rcl}f(3) & = & -2(3) + 1\\& = & -6 + 1\\& = & \mathbf{-5}\\\end{array}[/tex]