The average human heart beats 1.15 times 10 to the power of 5 per day. there are 3.65 times 10 to the power of 2 days in one year. how many times does your heart beat. write your answer in scientific notation, and round to one decimal place

  4.2·10⁷

Explanation:

Exponents are added when multiplying:

  (a^b)(a^c) = a^(b+c)

  1.15·10⁵ × 3.65·10² ≈ 4.2·10⁷

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Your calculator is designed to work with scientific notation. Scientific or graphing calculators can also display their output in scientific notation. A spreadsheet can also perform this calculation for you and display the result in the required format.

Calculators and spreadsheets sometimes use "E" in place of "×10^". That is, 4.2E7 means 4.2×10^7.

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