Answer:
Domain for #3: {-3, -1, 2, 4, 5}
Range for #3: {-4, 0, 2, 3}
#3 IS a function
Domain for #4: {-4, -2, 1, 3}
Range for #4: {-5, -1, 2, 3}
#4 IS NOT a function.
Explanation:
The domain is the group of x-coordinates of all points. The range is the group of y-coordinates for all points. You can use the vertical line test to see if it is a function by drawing a vertical line. If it touches 2 points it is not a function.