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Asad
Which of the following is equal to \(5^{17}× 4^{9}\)?
A. \(2 × 10^{13}\)
B. \(2 × 10^{17}\)
C. \(2 × 10^{20}\)
D. \(2 × 10^{26} \)
E. \(2 × 10^{36}\)

If you number of 5's as 17 then you cannot have more than 17 10s.

Answer is straight B.

Hope that helps!
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TheUltimateWinner
Which of the following is equal to \(5^{17}× 4^{9}\)?
A. \(2 × 10^{13}\)
B. \(2 × 10^{17}\)
C. \(2 × 10^{20}\)
D. \(2 × 10^{26} \)
E. \(2 × 10^{36}\)

Key property: \((x^n)(y^n) = (xy)^n\)
Example: \((3^7)(10^7) = 30^7\)


Strategy: When I check the answer choices, I see that they're all in the same form. Since I know that 2 x 5 = 10, I'm going to apply the above property after I rewrite \(4\) as \(2^2\)

Given: \(5^{17}× 4^{9}\)

Rewrite \(4\) as follows: \(5^{17}× (2^2)^{9}\)

Simplify by applying the power of a power law: \(5^{17}× 2^{18}\)

Strategy: In order to apply the how about property, we need the same exponent for bases 5 and 2. We can do this by rewriting \(2^{18}\) as \(2^{17} × 2^1\)

Rewrite \(2^{18}\) as follows: \(5^{17}× 2^{17} × 2^1\)

Apply the above property to get: \(10^{17} × 2^1\)

Answer: B
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TheUltimateWinner
Which of the following is equal to \(5^{17}× 4^{9}\)?
A. \(2 × 10^{13}\)
B. \(2 × 10^{17}\)
C. \(2 × 10^{20}\)
D. \(2 × 10^{26} \)
E. \(2 × 10^{36}\)
\(5^{17}× 4^{9}\)

=\(5^{17}× 2^{18}\)

=\(10^{17}× 2\), Answer will be (B)
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4^9 is same as 2^18

Then 5^17 x 2^17 x 2^1

That becomes 2^1 x 10^17

Which is option b

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(2^2)^9*5^17=2×1017
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