The answer is 7.0 x 10³. For 7000.0, shift 3 decimal places to the left, so the exponent for base 10 is 3.
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7000 = seven thousand or 7.0*103 in scientific notation
Shift 4 decimal places to the left for 77000.0. Then, we have 7.7 x 104.
7 x 10^3 x 6 x 10^4 = 4.2 x 10^8
It is 8.9*10^-5 in scientific notation
7000 + 80 + 9