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What is the product of [tex]$8.2 \times 10^9$[/tex] and [tex]$4.5 \times 10^{-5}$[/tex] in scientific notation?

A. [tex][tex]$36.9 \times 10^{-45}$[/tex][/tex]
B. [tex]$12.7 \times 10^4$[/tex]
C. [tex]$3.69 \times 10^5$[/tex]
D. [tex][tex]$3.69 \times 10^{14}$[/tex][/tex]

Answer :

To compute the product of
[tex]$$8.2 \times 10^9$$[/tex]
and
[tex]$$4.5 \times 10^{-5},$$[/tex]
we can follow these steps:

1. Multiply the coefficients:
[tex]$$8.2 \times 4.5 = 36.9.$$[/tex]

2. Add the exponents of the powers of 10:
[tex]$$9 + (-5) = 4.$$[/tex]
This gives an initial result of:
[tex]$$36.9 \times 10^4.$$[/tex]

3. Write the answer in proper scientific notation (where the coefficient must be between 1 and 10). Since [tex]$36.9$[/tex] is not between 1 and 10, we can express it as:
[tex]$$36.9 = 3.69 \times 10^1.$$[/tex]

4. Substitute this back into the product:
[tex]$$36.9 \times 10^4 = \left(3.69 \times 10^1\right) \times 10^4 = 3.69 \times 10^{1+4} = 3.69 \times 10^5.$$[/tex]

Thus, the product in scientific notation is:
[tex]$$3.69 \times 10^5.$$[/tex]

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