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storchak [24]
3 years ago
14

How many solutions does x^2-6x=-14 have

Mathematics
2 answers:
Ivan3 years ago
7 0

Answer:

no real solutions

Step-by-step explanation:

x^2-6x=-14

Add 14 to each side

x^2-6x+14 = 0

We can use the discriminant

b^2 -4ac  where ax^2 +bx+c

a=1  b = -6  c=14

(-6)^2 - 4(1)(14)

36 - 56

-20

Since the discriminant is less than zero there are no real solutions

valina [46]3 years ago
4 0

Answer:

it has 0 solution

Step-by-step explanation:

b^2-4ac<0=0 real # solution

brainliest please

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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

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5 0
3 years ago
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