Could someone PLEASE help me with these quick physics questions? Please provide a brief answer and show work, I WILL RATE YOU GOOD

(4) (4 pts.) For the system of capacitors shown in the figure, a potential difference of 25 V is maintained across ab. (a) What is the equivalent capacitance of this system between a and b? (b) How much total charge is stored by this system? c) How much charge does the 6.5 nF capacitor store? (d) What is the potential difference across the 7.5nF capacitor? 7.5 nF 18.0 nF 30.0 nF 10.0 nF HH 6.5 nF(5) (4 pt.) Point charges q1 = +2.20 uuC and q2 = -2.20 uC are placed at adjacent corners of a square for which the length of each side is 2.00 cm. Point a is at the center of the square, and point b is at the empty corner closest to q2. Take the electric potential to be zero at a distance far from both charges. (a) What is the electric potential at point a due to q1 and q2? (b) What is the electric potential at point b? (c) A point charge q3 = 3.50 uC moves from point a to point b. How much work is done on 93 by the electric field due to q1 and q2? (d) Is this work positive or negative