1.5x103=1,500
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15cubed or 153 = 3,3753,375 in exponential notation is 3.375 × 103
15 hundreds (1,500) in standard form is 1.5 × 103
' 15,000,000 ' is.
It is 15^3 is exponential notation,3000 + 200 + 70 + 5 in expanded notation and 3.375^10^3 in standard form.
It's best to convert those numbers from scientific notation to normal notation; that makes it easy to add them. After adding them, you can convert back to scientific notation if you want. Another option is to keep the numbers in scientific notation, but to convert them so that both have the same exponent.