-2, ____, ____, ____, 12 If the common difference is d, then to get the next term, we just add d each time. So to fill in the blanks: -2, -2+d, -2+2d, -2+3d, -2+4d=12 Solve the last equation -2+4d = 12 4d = 14 d =d = -2, -2+ , -2+2 , -2+3 , 12 -2, + , + , - + , 12 -2, , , , 12 -2, , 5, , 12 So the three arithmetic means between them are , 5, and Edwin