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A spring has a length of 0.333 m when a 0.300 kg mass hangs from it,...

A spring has a length of 0.333 m when a 0.300 kg mass hangs from it, and a length of 0.750 m when a 2.42 kg mass hangs from it. (Use 9.80 m/s2 for g.)

(a) What is the spring constant of the spring? (Give your answer to at least two decimal places.) in N/m

(b) What is the unloaded length of the spring? in meters

Please provide step by step explanations, thank you!

I've gotten around 56N/m and 31N/m for (a) and both are wrong.

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