How do i sketch f(x)4-x...x-1 then find f(-3)?

Answer 1

You take different values of x, calculate f(x) for each of these values and then plot the points [x, f(x)] on the coordinate plane. To find f(-3) you could read off the value of the graph, ie f(x) when x = -3. Alternatively, you could substitute x = -3 in the equation for f(x).

Since the question posted contains an ellipsis, the specific question is unknown and so there is no way to answer it.