SOLUTION: Multiply. Choose the answer that correctly expresses the answer with scientific notation.(5x10^3)(2.1x10^7) 1.05x10^9 1.05x10^7 1.05x10^8 1.05x10^14

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Multiply. Choose the answer that correctly expresses the answer with scientific notation.(5x10^3)(2.1x10^7) 1.05x10^9 1.05x10^7 1.05x10^8 1.05x10^14      Log On


   

Question 1043903: Multiply. Choose the answer that correctly expresses the answer with scientific notation.(5x10^3)(2.1x10^7)
1.05x10^9
1.05x10^7
1.05x10^8
1.05x10^14
Found 2 solutions by josgarithmetic, Alan3354:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
What do you know of the properties of exponents?

5%2A10%5E3%2A2.1%2A10%5E7
5%2A2.1%2A10%5E3%2A10%5E7
10.5%2A10%5E%283%2B7%29
and then what......?
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None of those choices!
10.5%2A10%5E10
1.05%2A10%2A10%5E10
1.05%2A10%5E%281%2B10%29
highlight%281.05%2A10%5E11%29, which is none of the choices offered.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
(5x10^3)(2.1x10^7) = 10.5*10^10
= 1.05*10^11
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None of the 4.
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PS Use * (Shift 8) for multiply.
x is often used elsewhere.