Spring constant in mass spring combinations

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mrcotton
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Homework Statement



How do we derive the total spring constants of different mass spring systems

Homework Equations



F= kΔx

The Attempt at a Solution



series_zps7ddf38f3.jpg
 
on Phys.org
parrallelLR_zpsec5564bc.jpg


In the parrallel case I can see how the displacement is the same but again I am confused by the forces.
I guess I need a couple of spring balances