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What is the sum of 3.2 x 10^3 and 4.0 x 10^2?
A7.2 x 10^3
B3.6 x 10^5
C3.6 x 10^3
D7.2 x 10^5
Answer & Solution
Correct answer: C. 3.6 x 10^3
Writing 4.0 x 10^2 as 0.40 x 10^3 and adding gives (3.2 + 0.40) x 10^3 = 3.6 x 10^3.
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