A platinum RTD has the following resistance versus temperature characteristic:

WBahn

Joined Mar 31, 2012
29,867
You need to show your best effort to get as far as you can with your homework. We can then try to see where your stumbling blocks are and lead you through them so that you can continue working your homework.

Even if we wanted to just tell you how to find R2, we couldn't, because we have no idea what R2 is. It's some resistor in some bridge circuit that the problem is referring to and that you haven't provided.
 
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