Electric Field Example Problem - 2 Charges

Two charges lie along a line 4cm apart.
(a) What is the strength and direction of the electric field at a point 3cm above the charge on the right (as shown)
(b) What is the force (both magnitude and direction) acting on the following when placed at the location "E"?
i. A charge of magnitude +2.0e-20C
ii. A charge of magnitude -1.9e-19C
iii. A neutral charge