I got the first two but i cannot figure out the rest.
7.
[tex]4.5 \times 10 ^{ - 1} - 2 \times 10 ^{ - 2} \\ (4.5 \times 10 - 2) \times 10 ^{ - 2} \\ (45 - 2) \times 10 ^{ - 2} \\ 43 \times 10 ^{ - 2} [/tex]
8.
[tex]1.6 \times {10}^{2} + 9.2 \times {10}^{5} \\ (1.6 + 9.2 \times {10}^{3} ) \times {10}^{2} \\ (1.6 + 9.2 \times 1000) \times 100 \\ (1.6 + 9200) \times 100 \\ 9201.6 \times 100 \\ 920160[/tex]
