In scientific notation

[tex](3.9 \times {10}^{ - 3}) + 0.0026 = [/tex]
[tex](39 \times {10}^{ - 4}) + (26 \times {10}^{ - 4}) = [/tex]
[tex]39 \times {10}^{ - 4} + 26 \times {10}^{ - 4} = [/tex]
[tex]Factoring \: {10}^{ - 4} [/tex]
[tex] {10}^{ - 4} \times (39 + 26) = [/tex]
[tex]65 \times {10}^{ - 4} = 6.5 \times {10}^{ - 3} [/tex]
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And we're done.
Thanks for watching buddy good luck.
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