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lara [203]
4 years ago
11

3/2x + 8= -1 solve equation

Mathematics
2 answers:
AnnZ [28]4 years ago
8 0

Answer:

x= -6

Step-by-step explanation:

3/2x+8-8=-1-8

3/2 x= -9

2. 3/2x=2(-9)

3x= -18

3x/3 = -18/3

x= -6

lord [1]4 years ago
4 0

Answer:

x = -6

Step-by-step explanation:

  1. Subtract 8 from each side, so it now looks like this: 3/2x = -9
  2. Divide each side by 3/2 to cancel out the 3/2 next to x. It should now look like this: x = -6

I hope this helps!

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Three merchants find a purse lying in the road. The first asserts that the discovery would make him twice as wealthy as the othe
Angelina_Jolie [31]

Answer: the system of equation would be :

  • A + Y = 2 (B+C)  
  • B + Y = 3B
  • C + Y = 5C

the three merchants would have 10 dollars, 10 dollars, and 5 dollars respectively

Step-by-step explanation:

before finding the purse, lets assume the wealth of the 3 merchants were as follows:

first merchant = A  dollars

second merchant = B dollars

third merchant = C dollars

  1. lets assume the purse contained Y dollars

After finding the purse they all claimed they would have the following:

first merchant said adding the money in the purse to his wealth would make him twice as rich as the other two combined : A + Y = 2 (B+C)  

second merchant said adding the money in the purse to his wealth would make his wealth triple  : B + Y = 3B

third merchant said adding the money in the purse to his wealth would make his wealth increase five folds : C + Y = 5C

third merchant = C dollars

therefore the system of equations to represent the problems are:

  • A + Y = 2 (B+C)  
  • B + Y = 3B
  • C + Y = 5C

2. now when the money in the purse is 20 dollars (Y= 20 dollars ), from the equations above

the second merchant will have :

B + Y = 3B  

 B + 20 = 3B

  3B - B = 20

  2B = 20

   B = 10 dollars

the third merchant will have :

C + Y = 5C

C + 20 = 5C

5C - C = 20

4C = 20

C = 5 dollars

the first merchant will have :

A + Y = 2 (B+C)  

A + 20 = 2 ( 10 + 5)

A = 2 (15) - 20

A = 30 - 20

A = 10 dollars

8 0
4 years ago
The average time before breakdown of a machine is normally distributed and has a mean of 18 weeks and a standard deviation of th
IceJOKER [234]

Answer:

19.24 weeks

Step-by-step explanation:

Given that;

Mean, m = 18

Standard deviation, s = 3

Break down cost = 2000

Preventive maintenance cost = 1400

The optimal preventive maintenance level is Given by :

Mean + service level * standard deviation

Service level = preventive maintenance cost / (breakdown cost + preventive maintenance cost)

Hence,

Service level = 1400/(1400+2000) = 1400 / 3400

Service level = 0.4117647

Optimal preventive maintenance level :

18 + (0.4117647 * 3)

18 + 1.2352941

= 19.235

= 19.24 weeks

8 0
3 years ago
Express in terms of logarithm without exponents
sdas [7]
\bf log_{{  a}}(xy)\implies log_{{  a}}(x)+log_{{  a}}(y)
\\ \quad \\
% Logarithm of rationals
\\ \quad \\
% Logarithm of exponentials
log_{{  a}}\left( x^{{  b}} \right)\implies {{  b}}\cdot  log_{{  a}}(x)\\\\
-----------------------------\\\\
log_b(xy^2z^{-6}\implies log_b(x)+log_b(y^2)+log_b(z^{-6})
\\\\\\log_b(x)+2log_b(y)-6log_b(z)

now, the one below that, which is equivalent to that? well, just look above it
6 0
3 years ago
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age
vodomira [7]

Answer:

Step-by-step explanation:

Assuming a normal distribution for the age of the consumers. We want to determine a 95% confidence interval for the true average age of the consumers.

Number of sample, n = 16

Mean, u = 22.5 years

Standard deviation, s = 5 years

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean ± z ×standard deviation/√n

It becomes

22.5 ± 1.96 × 5/√16

= 22.5 +/- 1.96 × 1.25

= 22.5 +/- 2.45

The lower end of the confidence interval is 22.5 - 2.45 =20.05

The upper end of the confidence interval is 22.5 + 2.45 =24.95

For 80% confidence interval,

the corresponding z value is 1.28. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean ± z ×standard deviation/√n

It becomes

22.5 ± 1.28 × 5/√16

= 22.5 +/- 1.28× 1.25

= 22.5 +/- 1.6

The lower end of the confidence interval is 22.5 - 1.6 =20.9

The upper end of the confidence interval is 22.5 + 1.6 =24.1

95% provides a wider interval than 80%. The wider the possible values of the true mean, the more confident we are. The lesser the possible values of the true mean, the less confident we are

4 0
4 years ago
Polygon C has an area of 7 square units. Jennie drew a scaled version of Polygon C and labeled it Polygon D. Polygon D has an ar
dem82 [27]

The ratio between Area of D and Area of C is 28:7.

That means the simplified version is 1:4.

From our ratio, we can derive that the scale factor is 4.

4 0
4 years ago
Read 2 more answers
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