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9966 [12]
3 years ago
12

SOLVE IT SO MANY POINT 3(7x+ 1) = 21

Mathematics
2 answers:
IrinaK [193]3 years ago
6 0
<span>3(7x+ 1) = 21
21x + 3 = 21
21x = 18
x = 6/7

hope this helps!</span>
Natasha_Volkova [10]3 years ago
4 0
First, you would simplify both sides of the equal signs, to do this, you would use the distributive property. 
21x + 3 = 21

Then, you would subtract 3 from both sides. 
21x = 18

Your final step would be to isolate the x, divide both sides by 21. 

Your answer would be x = 6/7

I hope this helps!

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Answer:

P(X \geq 7) = P(X=7) +P(X=8)

And we can find the individual probabilities using the probability mass function

P(X=7)=(8C7)(0.9)^7 (1-0.9)^{8-7}=0.3826  

P(X=8)=(8C8)(0.9)^8 (1-0.9)^{8-8}=0.4305  

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Step-by-step explanation:

Previous concepts  

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".  

Solution to the problem

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X \sim Binom(n=8, p=0.9)  

The probability mass function for the Binomial distribution is given as:  

P(X)=(nCx)(p)^x (1-p)^{n-x}  

Where (nCx) means combinatory and it's given by this formula:  

nCx=\frac{n!}{(n-x)! x!}  

And for this case we want to find this probability:

P(X \geq 7) = P(X=7) +P(X=8)

And we can find the individual probabilities using the probability mass function

P(X=7)=(8C7)(0.9)^7 (1-0.9)^{8-7}=0.3826  

P(X=8)=(8C8)(0.9)^8 (1-0.9)^{8-8}=0.4305  

And replacing we got:

P(X \geq 7) = P(X=7) +P(X=8)=0.3826 +0.4305=0.8131

7 0
3 years ago
Read 2 more answers
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Dahasolnce [82]
1/2d+6=1/2(d+12)
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3 years ago
9 is subtracted from 3 times the sum of 4 and 2​
Len [333]

Answer:

9

Step-by-step explanation:

3 times the sum of 4 and 2 = 3*(4+2)

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18 - 9 = 9

8 0
3 years ago
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