Let P be a point between points S and T . If ST = 21, SP = 3b – 11, and PT = b + 4, solve for b.

Mathematics

1 answer:

Ulleksa [173]3 years ago

8 0

I thick the answer is c

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According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction.

klemol [59]

Answer:

a) the expected number of tweets with no reaction is 71 tweets

b) the variance is 20.59 tweets² ( ≈ 21 tweets )and the standard deviation is

4.537 tweets (≈ 5 tweets)

Step-by-step explanation:

we can use the binomial probability distribution

P(x, N, p ) = N!/[(N-x)!x!] * p^x * (1-p)^(N-x)

where

x = number of successful events

N = population total

p = probability for success for every individual and independent event

P = probability for x successful events

in our case p = 71% = 71/100 (probability of a tweet without reaction) , N = 100 tweets

a) the expected number of tweets

E(x) = N* p = 100 tweets * 71/100 = 71 tweets

b) the variance is

V(x) = N * p * (1-p)

V = 100 * 71/100 * (1-71/100) = 71* 29/100 = 20.59 tweets² ( units of variance are [N²] )

the standard deviation is

s = √V = √20.59 tweets² = 4.537 tweets

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2 years ago

What is the value of the expression 24 + 32? Numerical Answers Expected! Answer for Blank 1:

AysviL [449]

Answer:

14!

Step-by-step explanation:

The actual question is 2^4 + 3^2, so 2+2+2+2=8 and 3+3=6. So, 8+6= 14

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3 years ago

a taxi service charges an initial fee of $5 plus $1.80 per mile. How many miles can you travel for $12

user100 [1]

First you need to write an equation or an inequality.

5+1.80x<=12
the x here is how many miles you are paying for, now you just solve for x.

5+1.80x<=12
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you can travel only three whole miles, you do not have enough money to go four full miles.

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Nadya [2.5K]

Answer:

$\dfrac{1}{6}$ .