Answer: c is approximately .42J/g°C
Explanation: Your equation is q=mc️T (p.s sorry for the weird triangle... i dont have a delta symbol). Plug heat absorbed or lost into q, plug mass into m, place c in ( ), and plug temperature change into delta T. To find temperature change subtract 20°C from 80°C to get 60°C. Use order of operations to get c alone, and then you'll have your answer.
