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A force of 9 lb is required to hold a spring stretched 6 in. beyond its...

A force of 9 lb is required to hold a spring stretched 6 in. beyond its natural length. How much work is done in stretching it from its natural length to 12in. beyond its natural length?Your answer should be in foot-pounds. I have an answer for this, I just want to double check.

Find the slope of the tangent line to the given polar curve at the point specified by the value of θ. r=2+sin(3θ), θ=pi/4

I have an answer for both of these, I just want to double check, please show work.

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