Calculus

A spring has a natural length of 18 cm. If a 22-N force is required to keep it stretched to a length of 24 cm, how much work W is required to stretch it from 18 cm to 21 cm? (Round your answer to two decimal places.)
Arg, another question that has me stumped! Would love some help.

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  1. Take a look at this site. The very first problem is one just like yours, but with different numbers.

    http://tutorial.math.lamar.edu/Classes/CalcI/Work.aspx

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