A 300.0 cm long spring is compressed with a force of 5.00 N, then it is compressed 4.00 cm with a force of 10.0 N, and finally it is compres?

Update: sed 6.00 cm with a force of 15.0 N. Calculate the force required to compress it 112 cm (Fs), and the energy contained in the spring when it is released (Ee)

I know both answers, just am struggling with how to find out how to do the work
Update 2: The answers are 280 N, and 160 J
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