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neonofarm [45]
3 years ago
12

An observer took a time-exposure photograph of polaris and five nearby stars. how many hours were required to show their star pa

ths
Mathematics
1 answer:
olga55 [171]3 years ago
5 0
Photographing stars requires you to keep your exposure open for a long time. Taking pictures of star trails would take about 30 minutes to three hours. If you multiply that for the 6 stars stated above in the problem then you would be needing that much time if the stars were close and approximately 3 to 18 hours capture their star trails if they were far apart from each other.
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Answer:

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Can someone please help me Factor 4x^2 - 81
Vsevolod [243]

Answer:

(2x-9)(2x+9)

Step-by-step explanation:

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So replace a with 2x and b with 9 giving us

4x^2-81=(2x-9)(2x+9)

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Answer:

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Step-by-step explanation:

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2. The radius is half the diameter, so is 2 ft. Put that in the formula, along with the value for π, and do the arithmetic.

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