Help on these two problems plz

In the image are three point charges, 21 = 18.4 MC, Q2 = -34.6 MC, and Q3 = 57.3 MC, arranged according to the figure. fourth point charge is located at point A with a charge of CA = 17.5 MC. The charges form a square with height y of 60.1 cn width x of 60.1 cm. Calculate the magnitude F of the net force on the charge at point A. F = N A - - - - Q2 + X A positive charge q is fixed at point (-4, -3) and a negative charge -q is fixed at point (-4, 0). 4- Determine the net electric force Fnet acting on a negative test 3- charge -Q at the origin (0, 0) in terms of the given quantities and physical constants, including the permittivity of free 2- space zo. Express the force using ij unit vector notation. Enter precise fractions rather than entering their approximate 1 - numerical values. - 3 - 2 2 3 4 -1- Fnet = 61 -2- 4xG 2000 - T 125 j -3- Incorrect 4