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2 years ago

9

Anna read 1/8 a book in 1/2 an hour. How much can she read in an hour?

2 answers:

Travka [436]2 years ago

8 0

Answer:

2/8 of a book in an hour

Step-by-step explanation:

1/2 an hour times 2 is 1 ( an hour)

1/8 times 2 is 2/8

she can read 2/8 of a book in an hour

elixir [45]2 years ago

5 0

Answer:

2/8 books in an hour

Step-by-step explanation:

Forgive me if i am wrong

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One pipe fills a storage pool in 20 hours, another pipe fills the same pool in 15 hours.

erica [24]

X=time of the third person it would take to fill the pool
We can suggest this equation:
6[(1/20) + (1/15) +(1/x)]=1
6[(3x+4x+60)/60x]=1
(7x+60)/10x=1
7x+60=10x
7x-10x=-60
-3x=-60
x=-60/-3
x=20

Answer: the third person alone would fill the pool in 20 hours .

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3 years ago

9) Solve for w:<br> W +12<br> 2w

Kazeer [188]

Answer:

w = 26

Step-by-step explanation:

set up an equation; since this is a right angle, it equals 90 degrees

90 = w + 12 + 2w

90 - 12 = w + 2w

78 = 3w

78/3

w = 26

8 0

2 years ago

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Evaluate the expression

Veseljchak [2.6K]

Answer:

3rd Option: 1

Step-by-step explanation:

Step 1: Define

(x + 4)/3x

x = 2

Step 2: Substitute and Evaluate

(2 + 4)/3(2)

6/6

1

6 0

2 years ago

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Aliun [14]

Answer: It has to be b if not sorry

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2 years ago

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The number of failures of a testing instrument from contamination particles on the product is a Poisson random variable with a m

photoshop1234 [79]

Answer: 0.1353

Step-by-step explanation:

Given : The mean of failures = 0.025 per hour.

Then for 8 hours , the mean of failures = $\lambda=8\times0.25=2$ per eight hours.

Let X be the number of failures.

The formula to calculate the Poisson distribution is given by :_

$P(X=x)=\dfrac{e^{-\lambda}\lambda^x}{x!}$

Now, the probability that the instrument does not fail in an 8-hour shift :-

$P(X=0)=\dfrac{e^{-2}2^0}{0!}=0.1353352\approx0.1353$

Hence, the the probability that the instrument does not fail in an 8-hour shift = 0.1353

7 0

2 years ago