Solar panel cell configuration and thermistor potential divider

[123Sub-Zero]

I am struggling on the following questions and require help. Please reply as soon as possible.
1.720 cells are connected together to form a solar panel to power a remote telephone. The individual cells are connected in a grid of x cells in series and then these series lines joined in parallel with each other forming y parallel lines. What are the values of x and y to give an emf of 15V and using all 720 cells?
2.A thermistor is set up in a potential divider with a resistor R across a 5v power supply. A voltage is taken across the resistor R. Derive an equation for how this voltage depends on the value of R, the 5V and RTH
Thanks in advance!

 

[Ouabache]

If you show us how you tried to solve your problems and where you are getting stuck, we can attempt to steer you in a successful direction.
I recommend seeing this https://www.physicsforums.com/showthread.php?t=94379