A calculation gives $T^2=37.86083836$. Reported to nine significant figures, $T$ is:

1. The quantity computed is $T^2$, not $T$ itself. 2. So the final step is to take the square root: $T=\sqrt{37.86083836}$. 3. That gives $T=6.15311615$ to nine significant figures. 4. Stopping at $T^2$ and reporting $37.86083836$ as $T$ was a recorded error. 5. Writing $6.15$ is correct in value but carries only three significant figures, so it fails the instruction. _Source: NECTA ACSEE 2022 Advanced Mathematics 142/1, Question 1: Calculating Device_