(2.280×106)÷(7.8×104)
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Do the division and round off the answer to two sig figs.
For the future, do this:
(2.280×10^6)÷(7.8×10^4)
assuming, of course that you meant them as exponents!
For the future, do this:
(2.280×10^6)÷(7.8×10^4)
assuming, of course that you meant them as exponents!