Please help me with the following questions

Question 2:

What is the electric potential in point P at (x,y) = (d/2,d/2) given three point charges q₁ = (-4.60x10^-9) C, q₂ = (-4.7x10^-9) C and q₃ = (-2.20x10^-9) C, located at (0,0), (0,d) and (d,d), respectively, with d = (1.40x10^-2) m ?

Answer in units of volts (V) with scientific notation.

d - - - - - - - - + d\f93 d P - - - - - 92 d