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djverab [1.8K]
3 years ago
12

WW+JJ+AA=WJA . Solve for W, J, and A. The values must be positive integers and different from each other.

Mathematics
1 answer:
stira [4]3 years ago
3 0

Answer:

W= 1, J=9 and A= 8

Step-by-step explanation:

Given equation: WW+JJ+AA=WJA and the values must be positive integers and different from each other.

Now find the value for W, J, and A.

The two digit number has 10th digit and unit digit

∴ WW= 10W+W= 11W

   JJ=  10J+J= 11J

   AA= 10A+A= 11A

In equation we can write as 11W+11J+11A= WJA

Similary for three digit number, it has 100th digit, 10th digit and unit digit.

∴ WJA= 100W+10J+A

In the given equation we can write as 11W+11J+11A= 100W+10J+A

Solving the equation now,

11W+11J+11A= 100W+10J+A

Subtracting 11W, 10J and A on both side

⇒ J+10A= 89W

Remember, the values must be positive integers and different from each other.

Now using the value between 1 to 9 to make equation equal.

If we use 1 for W, 8 for A and 9 for J

⇒ 9+10\times 8= 89\times 1

⇒ 89=89

∴ Value will be W= 1, J= 9 and A= 8.

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Given:

Fixed cost = b = $ 42,500

Production cost (Variable cost) /unit = m = $ 6/ unit

Let 'x' represent the number of unit, therefore the variable cost will be

6x

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C(x)=6x+42500

b) The revenue function is the amount the product is sold per unit.

Recall: 'x' represents the number of units.

Therefore,

11\times x=11x

Hence, the revenue function R(x) is

R(x)=11x

c) The profit function is the difference between the revenue function and the cost function.

P\mleft(x\mright)=11x-\mleft(425000+6x\mright)=5x-42500

Hence, the profit function is

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Using the profit function

P(x)=5x-42500

Therefore,

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4 0
1 year ago
The manufacturer of hardness testing equipment uses steel-ball indenters to penetrate metal that is being tested, however, the m
masha68 [24]

Answer:

1.667-2.31\frac{1.803}{\sqrt{9}}=0.2789  

1.667+2.31\frac{1.803}{\sqrt{9}}=3.055  

So on this case the 95% confidence interval would be given by (0.2789;3.055)  

The 95% confidence interval to judge whether the two indeners result in different measurements is?

Yes the confidence interval not contains the value 0 so we can conclude that the values for Diamond are significantly higher than the values for Steel Ball at 5% of significance.

Step-by-step explanation:

We have the following dataset:

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Steel Ball   51   57   61   70   68   54   65  51   53

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If we calculate the differences diamond-steel ball we have this datase:

d: 2, -2, 2, 4, 1, 2, 3, 0, 3

The second step is calculate the mean difference  

\bar d= \frac{\sum_{i=1}^n d_i}{n}=1.667

The third step would be calculate the standard deviation for the differences, and we got:

s_d =\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1} =1.803

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The confidence interval for the mean is given by the following formula:  

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}} (1)  

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:  

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Since the confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,9)".And we see that t_{\alpha/2}=2.31.

Now we have everything in order to replace into formula (1):  

1.667-2.31\frac{1.803}{\sqrt{9}}=0.2789  

1.667+2.31\frac{1.803}{\sqrt{9}}=3.055  

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Yes the confidence interval not contains the value 0 so we can conclude that the values for Diamond are significantly higher than the values for Steel Ball at 5% of significance.

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