Answer:
9.7×10³
Explanation:
(3.6×10³) + (6.1×10³) = (3.6+6.1)×10³ = 9.7×10³
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The factor of 10³ can be factored out while you do the sum.
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A calculator can find the sum for you. A scientific or graphing calculator will have the option to display the result in scientific notation format.