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IrinaVladis [17]

1 year ago

13

A shipment contains 9 igneous, 7 sedimentary, and 7 metamorphic rocks. If 7 rocks are selected at random, find the probability t

hat exactly 5 are sedimentary.

1 answer:

yKpoI14uk [10]1 year ago

7 0

Answer:

75 percent

Step-by-step explanation:

see the thing is

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Find the first four terms of the recursive sequence defined by the following formula: an = an-1 4 where a4 = 2 1 4 , , , 2 1 4.

Elina [12.6K]

The first four-term of the sequence is found by the given equation $a_{n-1} = 4a_n$ is given as 144, 36, 9, and 9/4.

<h3>What is a sequence?</h3>

A sequence is a list of elements that have been ordered in a sequential manner, such that members come either before or after.

The given equation will be

$\rm a_n = \dfrac{a_{n-1}}{4} \\\\a_{n-1} = 4a_n$

And

$a_4 = 2 \dfrac{1}{4} = \dfrac{9}{4}$

For n = 4, we have

$\rm a_{4-1} = 4a_4\\\\a_3 \ \ \ = 4*\dfrac{9}{4} \\\\ a_3 \ \ \ = 9$

For n = 3, we have

$\rm a_{3-1} = 4a_3\\\\a_2 \ \ \ = 4*9 \\\\ a_2 \ \ \ = 36$

For n = 2, we have

$\rm a_{2-1} = 4a_2\\\\a_1 \ \ \ = 4*36 \\\\ a_1 \ \ \ = 144$

More about the sequence link is given below.

brainly.com/question/21961097

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1 year ago

Evaluate 3^3+4*6<br><br> pls i need it for sumthing really quick

Masja [62]

Answer : 4123

Explanation:

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2 years ago

Which polynomial is a perfect square trinomal x^2 -6x +9 b) x^2 -2x +4 c) x^2 +5x +10 d) x^2 +4x +16

cestrela7 [59]

I hope this helps you

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2 years ago

Can someone please help me answer this question, and please help me how you arrived to your correct answer? thank you!

galben [10]

$\sqrt{ - 180 {x}^{16} } \\ = \sqrt{( - 1) \times \: 2 \times 2 \times 3 \times 3 \times 5 \times {x}^{8} \times {x}^{8} } \\ = (2 \times 3 \times {x}^{8} ) \sqrt{( - 1) \times 5 } \\ = 6 {x}^{8} \times \sqrt{ - 1} \times \sqrt{5} \\ = 6 {x}^{8} i \: \sqrt{5}$

so answer is option 4

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3 years ago

A wheel has a diameter of 21 inches. About how far does it travel if it makes 30 complete revolutions?

Lelu [443]

3 multiplied by 20 is 60

Multiply this by 10 and you get 600

1 Multiplied by 30 is 30

Find the total of the two answers (Which is 630) this is your answers

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2 years ago