1. **State the problem:** We need to calculate $$\frac{7.45 \times 10^{-12}}{2.12 \times 10^{-5}}$$ and express the answer in standard form to 3 significant figures. 2. **Divide the coefficients:** $$\frac{7.45}{2.12} \approx 3.514\ldots$$ 3. **Divide the powers of ten:** $$10^{-12} \div 10^{-5} = 10^{-12 - (-5)} = 10^{-7}$$ 4. **Combine the results:** $$3.514 \times 10^{-7}$$ 5. **Round to 3 significant figures:** $$3.51 \times 10^{-7}$$ **Final answer:** $$3.51 \times 10^{-7}$$