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denpristay [2]
3 years ago
7

I will give brainliest if correct

Mathematics
1 answer:
m_a_m_a [10]3 years ago
4 0

Answer:

The surface area of the net shown is: 88 in^2

Step-by-step explanation:

Break up the different shapes in the net:

Let's take the big square first:

It has a side of 5in and a base of 4in.

We multiply both these values to get 20in^2

Lets look at the small rectangular box now:

It has a side of 3in and a base of 4in.

We multiply both these values to get 12in^2

There are two big squares so we add up their surface areas:

20in^2 + 20in^2 = 40in^2

There are 4 small rectangular squares so we add up their surface areas:

12in^2 + 12in^2 + 12in^2 + 12in^2 = 48in^2

Now we add up the big square and small rectangular squares values:

40in^2 + 48in^2 = 88in^2

Therefore the answer is 88in^2

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A research group needs to determine a 90% confidence interval for the mean repair cost for all car insurance small claims. From
lutik1710 [3]

Answer:

a) z = 1.645

b) The should sample at least 293 small claims.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645, which means that the answer of question a is z = 1.645.

Now, find  the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?

They should sample at least n small claims, in which n is found when

M = 12, \sigma = 124.88. So

M = z*\frac{\sigma}{\sqrt{n}}

12 = 1.645*\frac{124.88}{\sqrt{n}}

12\sqrt{n} = 205.43

\sqrt{n} = \frac{205.43}{12}

\sqrt{n} = 17.12

\sqrt{n}^{2} = (17.12)^{2}

n = 293

The should sample at least 293 small claims.

8 0
3 years ago
The mean per capita consumption of milk per year is 144 liters with a variance of 484. If a sample of 183 people is randomly sel
trapecia [35]

Answer:

12144

Step-by-step explanation11213123:

8 0
2 years ago
A child in a neighborhood had a lemonade stand where large cups sold for $0.75, medium cups sold for $0.60 and small cups for $0
chubhunter [2.5K]

Answer:

  • s + m + L = 78
  • 0.45s +0.60m +0.75L = 46.95
  • s - m + L = 4

Step-by-step explanation:

The problem statement asks for the number of each size cup sold. You are told there are three sizes, so it is convenient to use one variable to represent the number of cups of a given size that were sold—three variables total.The problem statements tell you the relationships between the numbers:

  • the total number of cups sold
  • the total value of cups sold
  • the relationship between numbers of one size versus other sizes

It is appropriate to write an equation for each of these relationships, for a total of three equations. (Here, the last of these equations is put into standard form to make it easier to translate this to a matrix equation for solving by calculator.)

___

The solution is: 20 small, 37 medium, and 21 large.

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3 years ago
Please help im so lost right now
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I feel like it x=89 degrees....Becuase that is what i got...
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What is the answer to <br> 7/9 - 3/8=
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7/9-3/8
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