Answer:
Second option is correct.
Explanation:
Multiple decimal portion with decimal portion and exponent with exponent.
10^-1 x 10^1 = 10^0 = 1
5.2 x 3.0 x 1 = 15.6
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15.6
So 10⁻¹ = 0.1 and 10¹=10
Once you have that it is simpler:
5.2 * 0.1 = 0.52
3.0 * 10 = 30
0.52 * 30 = 15.6
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