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by Gurpinder » Mon Aug 16, 2010 6:53 pm
The average distance between the Sun and a certain
planet is approximately 2.3 × 10^14 inches. Which of the
following is closest to the average distance between
the Sun and the planet, in kilometers? (1 kilometer is
approximately 3.9 × 10^4 inches.)

(A) 7.1 × 10^8
(B) 5.9 × 10^9
(C) 1.6 × 10^10
(D) 1.6 × 10^11
(E) 5.9 × 10^11
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by saurabhmahajan » Mon Aug 16, 2010 11:31 pm
2.3 X 10^14 inches/3.9 X 10^4 inches = .589 X10 ^10
which can be equvivalent to 5.9 X 10 ^9

So answer is B.


OA ?
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by uwhusky » Mon Aug 16, 2010 11:36 pm
I would round up 3.9 to 4, make 2.3 x 10^14 to 23 x 10^13 and then divide.

23 / 4 = ~5.75, 10^13/10^4 = 10^9.

~5.75 x 10^ 9 = B.
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by kvcpk » Tue Aug 17, 2010 2:24 am
Gurpinder wrote:The average distance between the Sun and a certain
planet is approximately 2.3 × 10^14 inches. Which of the
following is closest to the average distance between
the Sun and the planet, in kilometers? (1 kilometer is
approximately 3.9 × 10^4 inches.)

(A) 7.1 × 10^8
(B) 5.9 × 10^9
(C) 1.6 × 10^10
(D) 1.6 × 10^11
(E) 5.9 × 10^11
No calculation is needed.

(2.3/3.9) * 10^14/10^4
approx 1/2 * 10^10
= approx 5 * 10^9
pick B
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by Gurpinder » Tue Aug 17, 2010 5:27 am
thanks guys

i actually started calculating the numbers..... hahah silly me
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