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andrezito [222]
3 years ago
13

-3(b – 7) I need a answer bad

Mathematics
2 answers:
iragen [17]3 years ago
7 0
-3(b - 7)...distribute thru the parenthesis...that means multiply 3 by everything in the parenthesis to get rid of the parenthesis

(-3 * b) - (-3 * 7) = -3b - (-21) = -3b + 21 <==
guajiro [1.7K]3 years ago
5 0
-3(b - 7)

-3*b = -3b

-3*7 = -21

-3b - 21
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Step-by-step explanation:

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(5x+1)(x+7)

Step-by-step explanation:

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Step-by-step explanation:

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3 years ago
Sound City sells the ClearTone-400 satellite car radio. For this radio, historical sales records over the last 100 weeks show 5
Harman [31]

Answer:

μ =2.23

\sigma_x^2= 1.49

\sigma_x=1.22

Step-by-step explanation:

Radio(x)                            weeks                           P(x)

0                                         5                                 5/100 = 0.05

1                                           27                               27/100=0.27

2                                          27                                 27/100 = 0.27

3                                         27                                 27/100 = 0.27  

4                                           9                                    9/100=0.09

5                                             5                                    5/100=0.05

We know that

Mean ,μ

\mu =\sum x.P(x)

μ = 0 x 0.05 + 1 x 0.27 + 2 x 0.27 + 3 x 0.27 + 4 x 0 .09 + 5 x 0.05

μ =2.23

\sigma_x^2= \sum x^2\times P(x)-(\sum x.P(x))^2

\sigma_x^2= 0^2\times 0.05+ 1^2\times 0.27+ 2^2\times 0.27+ 3^2\times 0.27+ 4^2\times 0.09+5^2\times 0.05-2.23^2

\sigma_x^2= 1.49

\sigma_x= \sqrt{\sigma_x^2}

\sigma_x=1.22

7 0
4 years ago
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faust18 [17]

Answer:

Well, "b" is just a variable. It's not really the function. I'm not quite sure what your asking. It can't be 1 because it can't. Math was founded on these mathematical laws. Consider talking to your teacher about this for further explanation.

Step-by-step explanation:

3 0
3 years ago
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