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kondor19780726 [428]
3 years ago
7

I have a math problem it says: He used 160 batteries in 40 calculators. how many batteries are required for 225 calculators? Can

I have a little help please?

Mathematics
1 answer:
iogann1982 [59]3 years ago
7 0
You can set up an equality:

40/160 = 225/x

Cross multiply:

40x = 160(225)

Evaluate: 

40x = 36000

Isolate x:

x = 900.

So, 900 batteries are required for 225 calculators. 

Hope this helped!! xx
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Answer:

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   b) The cost of grilled salmon dinners is $ 23.37.

Explanation:

 Let the cost for ribeye steak dinners  be m and cost for grilled salmon dinners  be n.

 A waitress sold 10 ribeye steak dinners and 18 grilled salmon dinners, totaling $590.39 on a particular day.

So, we have    

         10 m + 18 n = 590.39 -------equation 1

Another day she sold 22 ribeye steak dinners and 9 grilled salmon dinners, totaling $583.49

So, we have    

         22 m + 9 n = 583.49 -------equation 2

 equation 2 x 2

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 equation 3 - equation 1

        44 m + 18 n - (  10 m + 18 n ) = 1166.98 - 590.39

         m = 16.96 $

  Substituting in equation 1

        22 x 16.96 + 9 n = 583.49

          n = 23.37 $

   a) The cost of ribeye steak dinners is $ 16.96.

   b) The cost of grilled salmon dinners is $ 23.37.

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3 years ago
A representative of a car manufacturer in the United States made the following claim in a news report. "Ten years ago, only 53 p
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According to the p-value, the correct option regarding the decision of the test hypothesis is:

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<h3>What are the hypothesis tested?</h3>

At the null hypothesis, we test if the proportion is still of 0.53, that is:

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At the alternative hypothesis, we test if it has increased, that is:

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<h3>What is the decision according to the p-value?</h3>

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In this problem, the p-value is of 0.283 > 0.05, hence there is not sufficient evidence to conclude, at the significance level of a = 0.05, that the proportion of all car owners in the United States who own American-made cars has increased from what it was ten years ago, which means that option V is correct.

More can be learned about p-values at brainly.com/question/16313918

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3 years ago
What is the value of x and the length of DGE
pogonyaev

Answer:

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