What is the product of 8.2 × 109 and 4.5 × 10-5 in scientific notation?

Multiply the coefficients and add the exponents: 8.2 × 4.5 = 36.9, and 9 + (−5) = 4. So the product is 36.9 × 10⁴. To write it in scientific notation, move the decimal one place left and increase the exponent by 1: 3.69 × 10⁵, choice C.

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