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sineoko [7]
3 years ago
13

A pentagonal pyramid holds 30 cubic cm of sand. The area of the pentagon equals 9 square cm. Find the pyramid's height.

Mathematics
2 answers:
ArbitrLikvidat [17]3 years ago
5 0

Answer:

it should be 3.3 if rounded

Step-by-step explanation:

Aleksandr [31]3 years ago
3 0
Answer =3.333333333 is the answer

30cm divided by 9 cm to get ur answer
In this case it is recurring
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2/5m−1/3 when m = 3?
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Explanation:
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5 0
3 years ago
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Plutonium–238 has a yearly decay constant of 7.9 × 10-3. If an original sample has a mass of 15 grams, how long will it take to
eduard
The answer is 28 years

At = A0 * e^(-k * t)
At = 12 g
A0 = 15 g
k = 7.9 × 10^-3 = 0.0079 
t = ?

12 = 15 * e^(-0.0079 * t)
12/15 = e^(-0.0079 * t)
0.8 = e^(-0.0079 * t)

Logarithm both sides (because ln(e) = 1:
ln(0.8) = ln(e^(-0.0079 * t))
ln(0.8) = (-0.0079 * t) * ln(e)
-0.223 = -0.0079 * t
t = -0.223 / -0.0079
t = 28.23
t ≈ 28 years
8 0
3 years ago
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Vesna [10]

Answer:

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Step-by-step explanation:

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3 years ago
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Answer:

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