3. A person was told that s = t· r2, r = 5 and t = 2. s=t \cdot r^{2} \quad r=5 \quad t=2 They proceeded as follows s = t· p2 = 5- 22 = 20 (a) Where does the mistake occur? (b) Why is it incorrect? (c) Show the work to find the correct value for s.

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