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Alja [10]
3 years ago
10

- 7x + 5(2x - 1) = -20​

Mathematics
2 answers:
kramer3 years ago
8 0

Answer:

x= -5

Step-by-step explanation:

-7x + 5(2x - 1) = -20

-7x + 10x - 5 = -20

3x -5 = -20

3x = -15

x = -5

oksano4ka [1.4K]3 years ago
4 0

Answer:

x = -5

Step-by-step explanation:

-7x + 5(2x - 1) = -20 (Given)

-7x + 10x - 5 = -20 (Simplify)

3x - 5 = -20 (Simplify)

3x - 5 + 5 = -20 + 5 (Addition Property of Equality)

3x = -15 (Simplify)

\frac{3x}{3} = \frac{-15}{3} (Division Property of Equality)

x = -5 (Simplify)

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Sin (3x+19)=Cos(5x-25) <br> What is the value of x? <br> A) 6 <br> B) 12 <br> C) 18 <br> D) 24
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Answer:

B

Step-by-step explanation:

Using the cofunction identity

sin x = cos(90 - x)

Given

sin(3x + 19) = cos(5x - 25), then

3x + 19 = 90 - (5x - 25)

3x + 19 = 90 - 5x + 25

3x + 19 = 115 - 5x ( add 5x to both sides )

8x + 19 = 115 ( subtract 19 from both sides )

8x = 96 ( divide both sides by 8 )

x = 12 → B

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3 years ago
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An electronics store has two options for liquidating televisions that have not sold.
Oksanka [162]
Answser: first option <span>350(0.95)^x + 30x - 350

Explanation:

You can figure out the </span><span>function that shows the difference in price between option 1 and option 2 if you make a table simulating the behavior for a few months:

month                 price as per option 1          price as per option 2

start                     350                                     350

1                          350 - 5% (350) =                350 - 30
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2                          350 (0,95)×(0,95) =
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3                           350 (0,95)³                        350 - 30(3)

So now you can figure out the price with each option after x months:

                             350 (0.95)ˣ                        350 - 30x

And the difference is 350 (0.95)ˣ - [350 - 30x]

Which, expanding the square brackets, is 350 (0.95)ˣ + 30x - 350 ↔ the first option.
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7 0
2 years ago
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Answer:

[[5,2],[[4,1],

[3,0]]+[6,7]]

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Step-by-step explanation:

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3 years ago
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Answer:  B. Being around cigarette smokers and developing heart disease .

C. Independent. Being around cigarette smokers does not cause heart disease.

Step-by-step explanation:

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i.e. The two events here are Being around cigarette smokers and developing heart disease .

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