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Ivahew [28]
3 years ago
7

Please help me with this, anything is appriciated!! ^^

Mathematics
1 answer:
Papessa [141]3 years ago
5 0

Answer:

978-78-345=555 so 555/978

Step-by-step explanation:

subtract the number of pages that have been read. the fraction you have left is the number left to read over the total.

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Factor x^2 + 12x + 36
larisa [96]

Answer:

(x + 6 )(x + 6 )

2 numbers to add to 12 but also multiply to get 36

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3 years ago
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How many acute angles does an obtuse triangle have​
TiliK225 [7]

Answer:

i think 2

Step-by-step explanation:

ya i think 2

6 0
2 years ago
Daniel thinks of a number and subtracts 2
Tatiana [17]

Answer:

the number is 126

Step-by-step explanation:

1) multiply each side by 32: (n-2) / 32 = 4

2) subtract 2 from each side: n-2 = 128

3) n = 126

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3 years ago
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50 in the ratio of 1:4
VMariaS [17]

Answer:

10:40

Step-by-step explanation:

1+4=5

5=50

1=?

1×50÷5=10

5=50

4=?

4×50÷5=40

Answer =10:40

5 0
3 years ago
According to a study conducted by the Toronto-based social media analytics firm Sysomos, of all tweets get no reaction. That is,
Svetllana [295]

Answer:

a) E(X) = 71

b) V(X) = 20.59

Sigma = 4.538

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted (Sysomos website, January 5, 2015). </em>

<em> Suppose we randomly select 100 tweets. </em>

<em>a) What is the expected number of these tweets with no reaction? </em>

<em>b) What are the variance and standard deviation for the number of these tweets with no reaction?</em>

This can be modeled with the binomial distribution, with sample size n=100 and p=0.71, as the probability of no reaction for each individual tweet.

The expected number of these tweets with no reaction can be calcualted as the mean of the binomial random variable with these parameters:

E(X)=n\cdot p=100\cdot 0.71=71

The variance for the number of these tweets with no reaction can be calculated as the variance of the binomial distribution:

V(X)=np(1-p)=100\cdot0.71\cdot0.29=20.59

Then, the standard deviation becomes:

\sigma=\sqrt{V(X}=\sqrt{20.59}=4.538

5 0
3 years ago
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