You can use the formula for the midpoint of a line segment: (2x1​+x2​​,2y1​+y2​​). If you forget it, try to remember that you are just taking the average of the x-coordinates of the two points to get the x-coordinate of the midpoint, and doing the same for the y-coordinates. For the x-coordinates, the average of 3 and 0 is (3+0)÷2=1.5. Only one answer has this for the x - coordinate: (A). Don't waste time calculating the y-coordinate if you don't haveto!