a meteorologist wishes to estimate the nitrogen dioxide content of air per unit volume in a certain area. it is known from studies that the standard deviation is 2 parts per million (ppm). how many air samples must the meteorologist analyze to be 80% certain that the error of estimate does not exceed 0.2 ppm?

Answer:

  (a)  66 cm³

Step-by-step explanation:

You want the volume of a right triangular prism with a base right triangle that has a leg length of 3 cm and a hypotenuse of 5 cm. The height of the prism is 11 cm.

The base triangle is a 3-4-5 right triangle, so will have an area of ...

  A = (1/2)bh

  A = (1/2)(4 cm)(3 cm) = 6 cm²

The volume of the prism is ...

  V = Bh . . . . . where B is the base area

  V = (6 cm²)(11 cm) = 66 cm³

The volume of the prism is 66 cubic centimeters.

__

Additional comment

As you can see, the "work" is greatly simplified by the recognition of the {3, 4, 5} right triangle. If you must use the Pythagorean theorem to find the missing side length, you will find it to be ...

  b = √(c² -a²) = √(5² -3²) = √16 = 4

The answer can be estimated by realizing the missing dimension is less than 5. The volume of a rectangular prism of side lengths 3, 5, and 11 would be 3·5·11 = 165 cm³. A triangular prism with the same overall dimensions would have 1/2 that volume, or 82.5 cm³. Since the prism shown has a side length less than 5, its volume will be smaller than 82.5 cm³. The only reasonable answer is 66 cm³.

#95141404393

7, 5, 4 numbers can be the measures of the sides of a triangle.

To know if the three given numbers above in the question can be the measures of the sides of a triangle, one need to use the Triangle Inequality Theorem,

The law states that the sum of the lengths of any two sides of a triangle is one that needs to be greater than the length of the third side. Hence using it, one can say that:

Series 7, 5, 4  can be the measures of the sides of a triangle due to the fact that 7 is lesser than the sum of 5 and 4.

Series 3, 6, 2   cannot be the measures of the sides of a triangle because 6 is said to be greater than the sum of 3 and 2, and this violate the Triangle Inequality Theorem.

Series , 5, 2, 4, the three numbers can be the measures of the sides of a triangle due to the fact that the sum of any two sides is greater than the third side of 5. The same applies to the others.

Learn more about  triangle from

https://brainly.com/question/17335144

#SPJ1

Answer:

Solution,

Given,

radius of the circle(r)=9 cm

circumference of the circle(c)=?

We know that;

[tex]C=2{\pi}r[/tex]

[tex] \: \: \: \: = 2 \times 3.14 \times 9[/tex]

[tex]\: \: \: \: = 56.52[/tex]

Thus,the circumference of the circle is 56.52 cm.

The cost of variation is $3 per guest.

The equation of a line is y=mx+b

m is slope and b is the y intercept of the given equation

The ratio of the rise to the run, or rise divided by the run is known as slope and represents the steepness of line in the coordinate plane.

Constant of variation is slope in the given question.

From the graph number of guests taken in the x axis and cost is taken in the y axis

The Constant of variation which passes through two points (x₁, y₁) and (x₂, y₂) is

The formula to find slope is m=y₂-y₁/x₂-x₁

Here the two points from graph are (30, 90) and (20, 60)

Now plug in these values to find the constant of variation or slope

constant of variation = 90-60/30-20

=30/10

=3

Hence, the cost of variation is $3 per guest.

To learn more on slope of line click:

https://brainly.com/question/16180119

#SPJ1

the diagonal is 4cm

so, we know that a square has equal length on all sides. the way to find the diagnol of a square that its sides are 4cm you have to multiple the base and the height of the triangle that is created.

the type for that is : (a×b)÷2 so it will be (4×4)÷2=4

hope that helps!

The value of the angles A, B and C are calculated as:

A = 61°

B = 62°

C = 47°

The sum of angles on a straight line is 180 degrees.

Thus:

B + 61 + 47 = 180

B = 180 - (61 + 47)

B = 62°

We know that opposite angles are defined as the two angles opposite each other when two lines cross. They can also be called vertical angles due to sharing a vertex, which is the point where the two lines connect.

Thus:

C = 47°

Corresponding angles are defined as angles are angles that occur on the same side of the transversal line and are equal in size. Thus:

A = 61°

Read more about Missing Angle at: https://brainly.com/question/28293784

#SPJ1

After you collect your data, you have several options in regards to the null hypothesis. First, you could fail to reject the null hypothesis.

The data did not provide enough evidence to support the alternative hypothesis, and you accept the null hypothesis as the most likely explanation. Second, you could reject the null hypothesis. This means that your data provided enough evidence to support the alternative hypothesis, and you reject the null hypothesis as the most likely explanation. To neither accept nor reject the null hypothesis. The less common option and occurs when your data does not provide enough evidence to reject the null hypothesis, but also does not provide enough evidence to accept it as the most likely explanation.

The null hypothesis after you collect your data include failing to reject it, rejecting it, or neither accepting nor rejecting it.

To know more about null visit:-

https://brainly.com/question/31031308

#SPJ11

Unfortunately, the diagram or additional information is needed to determine the measures of angles ∠1 and ∠8. The given information about angles ∠2 and ∠6 and the fact that r ∥ s cut by a transversal t do not provide enough information to solve for the measures of angles ∠1 and ∠8.

To find the measures of angles ∠1 and ∠8, we need additional information about the angles or the lines r, s, and t in the diagram. It's possible that the diagram was not provided or the question is incomplete. Without more information, it's not possible to provide a complete answer to this question.

To learn more about transversal click here : brainly.com/question/13091916

#SPJ11

Unfortunately, the diagram or additional information is needed to determine the measures of angles ∠1 and ∠8. The given information about angles ∠2 and ∠6 and the fact that r ∥ s cut by a transversal t do not provide enough information to solve for the measures of angles ∠1 and ∠8.

           To find the measures of angles ∠1 and ∠8, we need additional information about the angles or the lines r, s, and t in the diagram. It's possible that the diagram was not provided or the question is incomplete. Without more information, it's not possible to provide a complete answer to this question.

To learn more about transversal click here : brainly.com/question/13091916

#SPJ11

Based on the data in the table, if a cow is randomly selected from farm B, the probability that its feed includes seaweed is 0.597 (Option D) and without is 0.57

Note that the total number of feed with sea weed is 74.
And the total number of cows on the farm B is 124.

Thus, the cows whose feed includes seaweed is 74/124

= 0.59677419354

≈ 0.597

The Probability of those whose feed is without sea weed is

Note that the total number of feed without sea weed is 40.
And the total number of cows on the farm B is 76.

Thus, the probability is 40/70
= 0.5714285714

≈ 0.571

Learn more about probability:
https://brainly.com/question/30034780
#SPJ1

the margin of error for the 90% confidence interval is 5.

the margin of error is equal to half the width of the confidence interval. Therefore, to find the margin of error, we need to find the width of the interval and divide it by 2.

The width of the interval is found by subtracting the lower bound (10) from the upper bound (20), which gives us 10. Dividing this by 2 gives us the margin of error, which is 5.

the margin of error for the 90% confidence interval is 5.
The margin of error for the given 90% confidence interval is 5.

A confidence interval (CI) is an estimated range of values within which the population mean is likely to fall, with a certain level of confidence (in this case, 90%). The CI is given as (10, 20). To find the margin of error, follow these steps:

1. Calculate the midpoint of the interval by averaging the lower and upper limits: (10 + 20) / 2 = 15.
2. Subtract the lower limit from the midpoint: 15 - 10 = 5.

The margin of error for the given 90% confidence interval (10, 20) is 5. This means that we are 90% confident that the population mean lies within 5 units of the midpoint value (15).

To know more about interval visit:

https://brainly.com/question/11051767

#SPJ11

The wrapping paper that she need, not including any overlap is B. B 340 in²

To find the area of wrapping paper needed, we need to find the total surface area of the box.

The surface area of a box is given by the formula 2(lw+wh+lh), where l is the length, w is the width, and h is the height. In this case, l=15 in, w=10 in, and h=2 in.

Substituting these values into the formula, we get 2(15×10+10×2+15×2)=340 in².

Therefore, Malia will need 340 in² of wrapping paper, not including any overlap. The answer is B.

Learn more about area on

https://brainly.com/question/25292087

#SPJ1

The sum of magnitude of vectors is 17.4 and direction is 88 degree.

Hence, option 3 is correct.

Given that,

Vector A: magnitude = 12 and direction = 60 degree

Vector B: magnitude = 10 and direction = 150 degree

Find the x and y components using the following formulas,

Ax = AcosΘ and Ay = AsinΘ

Substitute the values,

Ax = 12cos(60) and Ax = 6

Ay = 12sin(60) and Ay = 10.39

For vector B,

By using the same formulas,

Bx = 10cos(150) and  Bx = -5

By = 10sin(150)  and By = 7.66

We have the x and y components of both vectors,

Add them,

Rx = Ax + Bx

⇒ Rx = 6 + (-5)

⇒ Rx = 1

⇒ Ry = Ay + By

⇒ Ry = 10.39 + 7.66

⇒ Ry = 18.05

Finally, we can find the magnitude and direction of the resulting vector,

Magnitude = √(R²x + R²y)

Therefore, after putting values we get,

Magnitude = 17.4

Direction = [tex]tan^{-1}[/tex](Ry/Rx)

                = [tex]tan^{-1}[/tex](18.05/1)

                = 88 degrees

Therefore, the sum of the two vectors is a vector with magnitude 17.4 and direction 88 degrees.

To learn more about vectors visit:

https://brainly.com/question/12937011

#SPJ1

To find out how much Jeff is paid per hour of work, we need to divide his total earnings by the number of hours he worked.

Total earnings: $243.75

Number of hours worked: 25

Hourly pay rate: Total earnings / Number of hours worked

Hourly pay rate: $243.75 / 25 = $9.75

Therefore, Jeff is paid $9.75 per hour of work

Learn more about Jeff here: brainly.com/question/2473381

#SPJ11

The number of paths passing from A to B if we pass through the edge at most once is 3.

Since we have that paths from A to B in the shape of triangles, we desire to find the number of paths from a to B if we travel along the edges at most once.

Now,

So, we see that there are 3 paths passing from A to B if we pass through the edge at most once.

Thus, there are 3 paths passing from A to B if we pass through the edge at most once.

Learn more about number of paths here:

https://brainly.com/question/28161278

#SPJ1

The linear equation be 2lw + 2lh + 2wh + lb and total area is 2200 square feet.

Assume that,

l is the length of the pool (40 feet),

w is the width of the pool (30 feet),

h is the height of the pool (5 feet),

And b is the depth of the pool (also 5 feet).

To determine the total area of the pool liner needed to line the rectangular pool on all sides and the bottom, Mr. Vern can use the following equation:

Total area = 2lw + 2lh + 2wh + lb,

Plugging in the values, we get:

Total area = 2(40)(5) + 2(30)(5) + 2(30)(5) + (40)(30) Total area = 400 + 300 + 300 + 1200 Total area = 2200

Therefore, Mr. Vern would need to cover a total area of 2200 square feet with pool liner to line his rectangular pool on all sides and the bottom.

To learn more about equation visit:

https://brainly.com/question/29174899

#SPJ1

The number of ceiling boards in the room is 5000

From the question, we have the following parameters that can be used in our computation:

Measurement = 5 cm by 10 cm

Room = square of 5 m dimension

The area of the room is calculated as

Area = (5 m)²

When evaluated, we have

Area = 25 m²

The area of the board is

Area = 5 cm * 10 cm

So, we have

Area = 50 cm²

So, we have

Boards = (25 m²)/(50 cm²)

Evaluate the quotient

Boards = 5000

Hence, the number of boards is 5000

Read more about areas at

https://brainly.com/question/24487155

#SPJ1

Answer:

2x+2

Step-by-step explanation:

Answer:

2x + 2

Step-by-step explanation:

Differentiate using the Power Rule,

d/dx [x^n] = nx^n−1

Therefore, the total surface area of the pyramid is 312 square inches.

To find the surface area of a pyramid, we need to find the area of the base and the area of each triangular face and then add them together.

The area of the base is 1 square foot = 12 inches x 12 inches = 144 square inches.

To find the area of each face, we need to find the area of the corresponding triangle. We know that the height of each face is 14 inches and the base of each triangle is half the base of the pyramid, which is 6 inches. Therefore, the area of each face is:

(1/2) x base x height = (1/2) x 6 inches x 14 inches = 42 square inches.

Since there are four triangular faces, the total area of the faces is 4 x 42 square inches = 168 square inches.

Therefore, the total surface area of the pyramid is:

144 square inches (base) + 168 square inches (faces) = 312 square inches.

To know more about surface area,

https://brainly.com/question/31012313

#SPJ11

a. The probability will be less than $400 is approximately 4.78%. b. The probability will be $800 or more is approximately 34.13%. c. The probability will be between $500 and $1000 is approximately 68.27%. d. The most expensive travel plans are approximately $1,170 or more.

a. To find the probability that family expenses for the weekend will be less than $400, we need to standardize the value using the formula z = (x - μ) / σ, where x is the value we want to find the probability for, μ is the mean, and σ is the standard deviation. In this case, x = $400, μ = $749, and σ = $225. So, z = (400 - 749) / 225 = -1.56. Using a standard normal distribution table or calculator, we can find that the probability of a standard normal variable being less than -1.56 is approximately 0.0594. Therefore, the probability that family expenses for the weekend will be less than $400 is about 0.0594 or 5.94%.

b. To find the probability that family expenses for the weekend will be $800 or more, we again need to standardize the value. In this case, x = $800, μ = $749, and σ = $225. So, z = (800 - 749) / 225 = 0.227. Using a standard normal distribution table or calculator, we can find that the probability of a standard normal variable being greater than 0.227 is approximately 0.409. Therefore, the probability that family expenses for the weekend will be $800 or more is about 0.409 or 40.9%.

c. To find the probability that family expenses for the weekend will be between $500 and $1000, we need to standardize both values and then find the area between them. For $500, z = (500 - 749) / 225 = -1.11, and for $1000, z = (1000 - 749) / 225 = 1.11. Using a standard normal distribution table or calculator, we can find that the probability of a standard normal variable being less than -1.11 is approximately 0.1335 and the probability of a standard normal variable being less than 1.11 is approximately 0.8664. Therefore, the probability that family expenses for the weekend will be between $500 and $1000 is about 0.8664 - 0.1335 = 0.7329 or 73.29%.

d. To find the Labor Day weekend expenses for 5% of the families with the most expensive travel plans, we need to find the z-score corresponding to the 95th percentile of the normal distribution. This can be done using a standard normal distribution table or calculator, and we find that the z-score is approximately 1.645. Then, we can use the formula x = μ + zσ, where x is the value we want to find, μ is the mean, σ is the standard deviation, and z is the z-score we just found. Plugging in the values, we get x = 749 + 1.645(225) = $1,100.13. Therefore, the Labor Day weekend expenses for 5% of the families with the most expensive travel plans is about $1,100.13 or higher.
According to the American Automobile Association (AAA), families planning to travel over the Labor Day weekend are expected to spend an average of $749, with a standard deviation of $225. Assuming the amount spent is normally distributed:

Learn more about probability at: brainly.com/question/32004014

#SPJ11

Check the picture below.

[tex]x^2=(5+25)(5)\implies x^2=150\implies x=\sqrt{150}\implies x=5\sqrt{6} \\\\[-0.35em] ~\dotfill\\\\ x^2=(10+y)(10)\implies (\sqrt{150})^2=100+10y\implies 150=100+10y \\\\\\ 50=10y\implies \cfrac{50}{10}=y\implies 5=y[/tex]

Answer:

The answer is 9 cm to the nearest cm

Step-by-step explanation:

[tex]volume \: of \: a \: cone = \frac{1}{3} \pi {r}^{2} h[/tex]

1256=1/3×22/7×r²×14

1256=1/3×22×2×r²

3768=44r²

44r²/44=3768/44

r²=942/11

take square root of both sides

r=9 cm to the nearest cm

Answer:

Option B

Step-by-step explanation:

Given that two variables in the table as

                                           Total     Average

x              2   6   7   8   12       35          7

y             15  13   9   8    5        50         10

xy            30 78 63 64  60     295        59

(x-7)^2   25      1  0     1   25        52     10.4

(y-10)^2   25   9   1      4   25     64        12.8

Var x = 10.4 and std dev x = 3.225

Var Y = 12.8 and std dev Y = 3.578

Cov (xy) = E(xy)-E(x) E(Y)=59-70=-11

Correlation coefficient r

= Cov /sx sy = -11/(3.225)(3.578)=-0.9532

Round off to get

r=-0.953

Henceoption B is right.

I hope my answer helped! <3

The number of bales purchased for the farm is n = 7 bales

Given data ,

Dan works on a horse farm. There are 10 horses on the farm and they each eat 140 pounds of hay in a week

Now , Dan buys new hay for the farm every week

To find the total amount of hay needed for the week, we multiply the amount consumed by each horse by the number of horses:

Total hay needed = 10 horses x 140 pounds/horse = 1400 pounds

To determine the number of bales needed, we divide the total hay needed by the weight of each bale:

Number of bales needed = Total hay needed / Weight of each bale

On simplifying the equation , we get

Number of bales needed for agri supply = 1400 / 75 = 18.667

Number of bales needed for farm supply = 1400 / 150 = 9.33

Number of bales needed for tractor supply = 1400 / 200 = 7 bales

Number of bales needed ≈ 7 bales when there is not leftover

Hence , there is no leftover at the end of the week if he purchases 7 bales from the tractor supply

To learn more about equations click :

https://brainly.com/question/19297665

#SPJ1

The complete question is attached below :

Dan works on a horse farm. There are 10 horses on the farm and they each eat 140 pounds of hay in a week. Dan buys new hay for the farm every week. Where should Dan purchase hay from if he does not want any hay leftover at the end of the week? How many bales should he purchase?

the x-intercepts in a function are pretty much just its roots or solutions, so let's reword that

what's the equation of a parabola with roots at -3 and 4 that it passes through (0 , -6)?

[tex]\begin{cases} x = -3 &\implies x +3=0\\ x = 4 &\implies x -4=0\\ \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{original~polynomial}{a ( x +3 )( x -4 ) = \stackrel{0}{y}}\hspace{5em}\textit{we also know that } \begin{cases} x=0\\ y=-6 \end{cases} \\\\\\ a ( 0 +3 )( 0 -4 ) = -6\implies -12a=-6\implies a=\cfrac{-6}{-12}\implies a=\cfrac{1}{2} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{1}{2}( x +3 )( x -4 ) =y\implies \cfrac{1}{2}(x^2-x-12)=y\implies \boxed{\cfrac{x^2}{2}-\cfrac{x}{2}-6=y}[/tex]

Check the picture below.

The three costs that contribute to the total cost of a mortgage are the down payment, mortgage tax and monthly interest.

The correct option is a.

We have,

A down payment can be understood as a sum of money that a buyer pays in the early stages of purchasing an expensive good or service. The down payment represents a portion of the total purchase price, and the buyer will often take out a loan to finance the remainder. A down payment is a money paid upfront in a financial transaction, such as the purchase of a home or car.

Buyers often take out loans to finance the remainder of the purchase price. The higher the down payment, the less the buyer will need to borrow to complete the transaction, the lower their monthly payments, and the less they'll pay in interest over the long term.

Depending on the borrower and the type of purchase, lenders may require down payments as low as 0% or as high as 50%.

Learn more about payment, here:

brainly.com/question/15136793

#SPJ1

complete question:

What three costs contribute to the total cost of a mortgage?

A.

down payment, mortgage tax, and monthly interest

B.

closing cost, down payment, and monthly loan payment

C.

closing cost, monthly interest, and starting deposit

D.

starting deposit, monthly interest, and mortgage tax

Answer:

Circumference = 36π

Step-by-step explanation:

The formula for circumference is C = πd, where

We know that the diameter is simply 2 * the radius, so the diameter of the circle is 36 cm as 2 * a radius of 18 cm = 36 cm.

To find the circumference in terms of π, we simply multiply 36 and π, but don't simplify, approximate, etc.

Thus, the circumference in terms of π is C = 36π

Answer:

Step-by-step explanation:

To find MDG, we need to calculate the length of line segment DG.

Using the distance formula, the length of a line segment between two points (x1, y1) and (x2, y2) is given by:

Distance = √((x2 - x1)^2 + (y2 - y1)^2)

Let's calculate the length of line segment DG:

DG = √((-4 - 2)^2 + (9 - 5)^2)

= √((-6)^2 + (4)^2)

= √(36 + 16)

= √52

= 2√13

Therefore, MDG is equal to 2√13.

Now, let's analyze the line segments DE and DG:

Line segment DE: The coordinates of D are (2, 5) and the coordinates of E are (-4, -4). By calculating the length of DE using the distance formula, we can determine the length of DE.

DE = √((-4 - 2)^2 + (-4 - 5)^2)

= √((-6)^2 + (-9)^2)

= √(36 + 81)

= √117

= √(9 * 13)

= 3√13

Therefore, the length of line segment DE is 3√13.

Line segment DG: We have already calculated the length of DG as 2√13.

From the calculations, we can conclude that DE and DG have different lengths. DE is 3√13 while DG is 2√13.

In summary, line segments DE and DG have different lengths.

To prove the equation csc^4(x) - cot^4(x) = csc^2(x) + cot^2(x), we can start by expressing the trigonometric functions csc(x) and cot(x) in terms of sine and cosine:

csc(x) = 1/sin(x)

cot(x) = cos(x)/sin(x)

Substituting these expressions into the equation, we get:

(1/sin(x))^4 - (cos(x)/sin(x))^4 = (1/sin(x))^2 + (cos(x)/sin(x))^2

Next, we simplify each term separately:

(1/sin(x))^4 = 1/sin^4(x)

(cos(x)/sin(x))^4 = cos^4(x)/sin^4(x)

Expanding the powers, we have:

1/sin^4(x) - cos^4(x)/sin^4(x) = 1/sin^2(x) + cos^2(x)/sin^2(x)

Combining the fractions on the left side:

(1 - cos^4(x))/sin^4(x) = (1 + cos^2(x))/sin^2(x)

Now, let's simplify the left side:

1 - cos^4(x) = sin^4(x)

Using the identity sin^2(x) + cos^2(x) = 1, we can rewrite the equation as:

sin^4(x) = sin^4(x)

The equation simplifies to an identity, showing that the original equation csc^4(x) - cot^4(x) = csc^2(x) + cot^2(x) is true for all values of x.

Therefore, we have proved the given equation.

Know more about trigonometric functions here:

https://brainly.com/question/25618616

#SPJ11