Using Scientific Notation

Perform the operations and write the answer in scientific notation.

1. ⓐ $\left(8.14 \times 10^{−7}\right) \left(6.5 \times 10^{10}\right)$
2. ⓑ $\left(4 \times 10^{5}\right) \div \left(−1.52 \times 10^{9}\right)$
3. ⓒ $\left(2.7 \times 10^{5}\right) \left(6.04 \times 10^{13}\right)$
4. ⓓ $\left(1.2 \times 10^{8}\right) \div \left(9.6 \times 10^{5}\right)$
5. ⓔ $\left(3.33 \times 10^{4}\right) \left(−1.05 \times 10^{7}\right) \left(5.62 \times 10^{5}\right)$