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irinina [24]
2 years ago
10

Mr jacob has 4 white beans and 8 black beans what is thr frction of the black beans 1/3 4/8 8/4 2/3

Mathematics
2 answers:
Serggg [28]2 years ago
8 0

Explanation:

<u>We know that:</u>

  • White beans: 4
  • Black beans: 8
  • Total number of beans: 4 + 8 = 12

The fraction of the black beans is the number of black beans divided by the total number of beans.

Solution:

<u>Fraction of black beans: Black beans/Total beans</u>

  • => 8/4 + 8
  • => 8/12
  • => 2/3

<u>Hence, the fraction of black beans is 2/3.</u>

Yanka [14]2 years ago
3 0
If you can give me more information on this I could help you a bit more respond.
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Answer:

\frac{3}{4}

Step-by-step explanation:

Total number of red disk=6

Total number  of yellow disk=2

Total disk=6+2=8

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Odd number on red disk=1,3,5=3

Probability,P(E)=\frac{favorable\;cases}{total\;number\;of\;cases}

Using the formula

The probability of getting odd number disk=\frac{4}{8}=\frac{1}{2}

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The probability of selecting a red disk,given that an odd numbered disk is selected=\frac{\frac{3}{8}}{\frac{1}{2}}=\frac{3}{8}\times 2=\frac{3}{4}

Using conditional probability

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6 0
3 years ago
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
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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))
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-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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