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Lelechka [254]
2 years ago
7

4b - 7 - 15b + 3 Pls give full explanation I don't understand this stuff.

Mathematics
2 answers:
allsm [11]2 years ago
5 0
Combine like terms so add 4b and 15b together and add 7 and 3 together and then the answer would be 19b-10
mojhsa [17]2 years ago
5 0
4b-7-15b+3

=-11b-4

------------------------------

Explanation:

4b = b+b+b+b

15b = b+b+b+b+b+b+b+b+b+b+b+b+b+b+b

-------------------------------

So...

4b-15b

=(b+b+b+b)-(b+b+b+b+b+b+b+b+b+b+b+b+b+b+b)

=b+b+b+b-b-b-b-b-b-b-b-b-b-b-b-b-b-b-b

=-b-b-b-b-b-b-b-b-b-b-b=-11b

----------------------------------

-7 = -1-1-1-1-1-1-1

3=1+1+1

-7+3=(-1-1-1-1-1-1-1)+(1+1+1)

=-1-1-1-1-1-1-1+1+1+1=-1-1-1-1=-4

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A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below
jok3333 [9.3K]

Answer:

The value of the test statistic = 2.58

Test statistic Z = - 4.805

|Z| = 4.805 > 2.58

Null hypothesis is rejected The value of the test statistic = 2.58

There is  significant difference between in the mean number of times men and women send a Twitter message in a day

Step-by-step explanation:

Step(i):-

Sample size of men  n₁ = 25

mean of the first sample x₁⁻ = 20

Standard deviation of the first sample σ₁ = 5

Sample size of women n₂ = 30

mean of the second sample x₂⁻ = 30

Standard deviation of the first sample σ₂ = 10

Level of significance ∝= 0.01

<u>Step(ii)</u>:-

Null Hypothesis : H₀: There is no significant difference between in the mean number of times men and women send a Twitter message in a day

Alternative Hypothesis :H₁:There is  significant difference between in the mean number of times men and women send a Twitter message in a day

Test statistic

Z = \frac{x^{-} _{1} - x^{-} _{2} }{\sqrt{\frac{S.D_{1} ^{2} }{n_{1} }+\frac{ S.D_{2} ^{2}}{n_{2} }  } }

Z = \frac{20 - 30 }{\sqrt{\frac{(5)^{2}  }{25 }+\frac{ (10)^{2}  }{ 30}  } }

Z =  \frac{-10}{2.081} = - 4.805

The value of the test statistic = 2.58 C

|Z| = 4.805 > 2.58

Null hypothesis is rejected The value of the test statistic = 2.58

<u>Conclusion:</u>-

There is  significant difference between in the mean number of times men and women send a Twitter message in a day

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2 years ago
What is (x+1)(2x-4)(1/x+1)
Taya2010 [7]
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Answer:

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Step-by-step explanation:

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