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Answer:
1.[tex]4.9\times10^7[/tex]
2.[tex]7.589\times10^{11}[/tex]
Step-by-step explanation:
In order to find the answer to this question convert all notations into standard form and then multiply.
1.
[tex]7.0 \times10^3\times7.0\times10^3[/tex]
[tex]7.0.0.0.=7000[/tex]
[tex]7000\times7000=49000000[/tex]
Convert back into notation:
[tex]49000000 = 4.9\times10^7[/tex]
2.
[tex]8.7\times10^5\times8.7\times10^5[/tex]
[tex]8.7 = 8.7.0.0.0.0. = 870000[/tex]
[tex]870000 \times 870000 = 756900000000[/tex]
Convert back into notation:
[tex]756900000000=7.589\times10^{11}[/tex]
[tex]7.589\times10^{11}[/tex]
Hope this helps.