Help!!

0.30 m - 0.20 m- + X Q2 = Q3 = 8.0 uC +3.0 uC -4.0 MC Three electric charges rest on the x-axis. Q1 (-8.0/C) is at the origin. Q2 (+3.0/C) is 0.30m from the origin. Q3 (-4.0/C) is 0.50m from the origin. See corresponding image. Write the direction as + or - , the numerical answer with the correct significant figures, the unit symbol and NO SPACES. (Ex: -3.5N) a) Calculate the the Electric Force of Q1 on Q2. b) Calculate the Electric Force of Q3 on Q2. c) Calculate the Electric Force of Q1 on Q3. d) Calculate the Net Electric Force of Q1 and Q3 on Q2