The initial temperature was
Once again, you need to know the specific heat of nickel before doing any calculations.
The specific heat of nickel is listed as being
In order to find the initial temperature of the sample, you'll use this equation
This time, you know that you supplied a certain amount of heat to the sample, 82.9 J to be precise, and that its final temperature was measured at
You can use the values given to you to dolve for the initial temperature of the sample by
Rounded to three sig figs, the answer will be