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kogti [31]
2 years ago
14

two companies working together can clear a parcel of land in 9 hours. working alone,it would take company A 3 hours longer to cl

ear the land than it would company B. How long would it take company B to clear the parcel of land alone ( round your answer to the nearest tenth.)​
Mathematics
1 answer:
Anvisha [2.4K]2 years ago
7 0

Answer:

.33

Step-by-step explanation:

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Binomial Theorem, proof
IrinaVladis [17]

It follows from the definition of the binomial coefficient:

\dbinom nr=\dfrac{n!}{r!(n-r)!}

So we have

(n+1)\dbinom nr=(n+1)\dfrac{n!}{r!(n-r)!}=(r+1)\dfrac{(n+1)!}{(r+1)!(n-r)!}

That is, (n+1) gets absorbed into the numerator's factorial, and we introduct (r+1) into the denominator. Now, (n+1)-(r+1)=n-r, so we get

(n+1)\dbinom nr=(r+1)\dfrac{(n+1)!}{(r+1)!((n+1)-(r+1))!}=(r+1)\dbinom{n+1}{r+1}

as required.

4 0
3 years ago
If line A contains the points (3, -4) and (6, -2), and line B contains the points (-1, 5) and (1, 2), prove that the lines are p
vivado [14]

Answer:

Correct answer:  sa · sb = 2/3 · (- 3/2) = - 1

Step-by-step explanation:

Given:

line A - (x₁, y₁) = (3, -4)   and (x₂, y₂) = (6, -2)

line B - (x₁, y₁) = (-1, 5)   and (x₂, y₂) = (1, 2)

The slope is calculated using the following formula:

s = (y₂ - y₁) / (x₂ - x₁)

sa = (-2 - (-4)) / (6 - 3) = (-2 + 4) / 3 = 2 / 3

sa = 2 / 3

sb = (2 - 5) / (1 - (-1)) = -3 / 2

when lines are perpendicular to each other then the slopes are in the next relationship:

sa · sb = - 1

we will check:

sa · sb = 2/3 · (- 3/2) = - 1

God is with you!!!

7 0
3 years ago
A)32 ft<br> B) 60 Ft<br> C) 72ft<br> D) 96ft
Bad White [126]

Answer:

96

Step-by-step explanation:

16 * 6 = 96

4 0
2 years ago
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What is the area of this figure? 6cm, 7cm, 10cm, 21cm, and 6cm
ch4aika [34]
I also think that its a
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2 years ago
How many gallons is equivalent to 20 quarts. There are 4 quarts in a gallon.
lisabon 2012 [21]

Answer:

5 gallons plz give brainliest

Step-by-step explanation:

5 0
2 years ago
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