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I set k=F/x:

k=9.8m/.018 = 544.44m

I used T=2π√(m/k) to solve for the period:

T=2π√(m/544.44m) = .269s The mass canceled out

I did 1/T for frequency:

1/.269 = 3.714Hz

The answer is wrong. I think it might have something to do with the 14.2cm information but I don't know how to incorporate it in the problem.