Which of the following statements about the ventilation/perfusion (V/Q) ratio in a healthy person is true?
A) The lower portion of the lungs has more oxygen than perfusion.
B) Blood flow and amount of ventilation are equal throughout the lungs.
C) Amount of blood is greater than amount of oxygen in the lungs.
D) The upper portion of the lungs has more ventilation than blood flow

The expected value for a student to spend on lunch each day is $7.09.

To calculate the expected value for a student to spend on lunch each day based on the survey data,

we need to find the average amount spent by each student.

We can calculate the expected value by summing up the products of the number of students and the amount spent on lunch for each category, and then dividing by the total number of students:

Expected value = [tex](2 * 10 + 1 * 8 + 2 * 6 + 3 * 5 + 8 * 4 + 11 * 3 + 10 * 2.59 + 13 * 5.11 + 10 * 5.18 + 10 * 9.07) / 50[/tex]

Expected value = [tex](20 + 8 + 12 + 15 + 32 + 33 + 25.9 + 55.21 + 51.8 + 90.7) / 50[/tex]

Expected value = $354.71 / 50

Expected value ≈ $7.09

Therefore, based on the survey data, the expected value for a student to spend on lunch each day is approximately $7.09.

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A real distance of 27 meters will be represented by a distance of 54 centimeters on the plane.

We know that the scale factor of the plane is:

6cm to 3m

Then each meter on the plane will be represented by:

1m = (6cm/3) = 2cm

So each meter in the real world is represented by 2 centimeters on the plane.

Then a real distance of 27 meters will be reprsented by:

27m = 27*(2cm) = 54cm

That distance is represented by 54 centimeters.

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The 95% confidence interval for the true proportion of all nannies who work for a celebrity is approximately 0.0145 to 0.0613.

In this case, we have a random sample of 528 in-home childcare providers (nannies) and we want to estimate the proportion of nannies who work for a celebrity.

To do this, we calculate the sample proportion (p-hat) by dividing the number of nannies working for a celebrity by the total sample size.

Here we have

Sample size (n) = 528

Number of nannies working for a celebrity (x) = 20

First, we calculate the sample proportion (p-hat), which is the proportion of nannies working for a celebrity in the sample:

=> p-hat = x / n = 20 / 528

Next, we calculate the standard error (SE) using the formula:

SE = √(p-hat × (1 - p-hat)) / n)

SE = √((20 / 528) × (1 - 20 / 528) / 528)

Now, we can calculate the margin of error (ME) using the critical value associated with a 95% confidence level.

Since we have a large sample size, we can use the z-value:

z-value for a 95% confidence level ≈ 1.96

ME = z-value × SE

Finally, we can calculate the confidence interval:

Confidence Interval = p-hat ± ME

Substituting the values:

Confidence Interval = [ 20 / 528) ± (1.96×√(20 / 528)×(1 - 20 / 528) / 528) ]

Simplifying:

Confidence Interval ≈ 0.0379 ± 0.0234

Therefore,

The 95% confidence interval for the true proportion of all nannies who work for a celebrity is approximately 0.0145 to 0.0613.

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If Gary's car gets about 20 miles per gallon.

a.  Gary can drive about 198 miles on 9.9 gallons of gas.

b.  the cost of 9.9 gallons of gas at $2.90 per gallon would be  $28.71.

a. Number of miles

Miles = Gallons * Miles per gallon

Miles = 9.9 gallons * 20 miles/gallon

Miles = 198 miles

Therefore Gary can drive about 198 miles on 9.9 gallons of gas.

b. Cost of the gas

Cost = Price per gallon * Gallons

Cost = $2.90/gallon * 9.9 gallons

Cost = $28.71

Therefore the cost of 9.9 gallons of gas at $2.90 per gallon is $28.71.

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Option d) He uses the bottom of the Protractor to draw a Straight line connecting the mark he made with the vertex.

The correct step to complete the drawing of a 50° angle is:

Step 4: He uses the bottom of the protractor to draw a straight line connecting the mark he made with the vertex.

In this step, Jimmy will connect the mark he made at 50° on the protractor with the vertex of the angle using a straight line. This line will complete the angle and ensure that it measures 50°. By connecting the mark with the vertex, Jimmy will have successfully drawn a 50° angle.

After completing Step 4, he can proceed to Step 5, which involves drawing arrows on both ends of the line to indicate that they are rays.

Therefore, the correct answer is option d) He uses the bottom of the protractor to draw a straight line connecting the mark he made with the vertex.

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The approximate volume of the sphere is 606.25 cm³, which is closest to option D. 606 cm³.

To find the approximate volume of a sphere, we'll use the formula:
Volume = (4/3) × π × r³
Given that the sphere has a diameter of 10.5 cm, we can find its radius by dividing the diameter by 2:
Radius (r) = Diameter / 2 = 10.5 cm / 2 = 5.25 cm
Now, we can plug the radius into the volume formula:
Volume = (4/3) × π × (5.25 cm)³
Volume ≈ (4/3) × 3.14 × (144.703125 cm³)
Volume ≈ 4.1867 × 144.703125 cm³
Volume ≈ 606.25 cm³
The approximate volume of the sphere is 606.25 cm³, which is closest to option D. 606 cm³.

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The gradient of the trail you hiked up is approximately 754.6 ft/mi. This means that for every mile you hiked horizontally, the elevation increased by about 754.6 feet.

The gradient of the trail is essentially the steepness of the trail, or the rate at which the elevation changes per unit of horizontal distance. To find the gradient in ft/mi, we need to calculate the total change in elevation and divide it by the total horizontal distance.
The total change in elevation is the difference between the elevation at the summit and the elevation at the trail head, which is:
6,849 ft - 645 ft = 6,204 ft

The total horizontal distance of the trail is 8.2 mi. To convert the total change in elevation to ft/mi, we divide it by the total horizontal distance
6,204 ft / 8.2 mi = 754.63 ft/mi
Rounding this to the tenths place gives us:
Gradient = 754.6 ft/mi

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Answer: y = -4x + 2

Step-by-step explanation:

The expected value is 0.8, variance is 0.48, and standard deviation is 0.693 with the given probability.

a. The probability of getting one success in two trials with p=0.4 is given by the binomial probability formula:

f(1) = 2C1 * (0.4)^1 * (0.6)^1 = 0.48

b. The probability of getting zero successes is:

f(0) = 2C0 * (0.4)^0 * (0.6)^2 = 0.36

c. The probability of getting two successes is:

f(2) = 2C2 * (0.4)^2 * (0.6)^0 = 0.16

d. The probability of at least one success is:

P(at least one success) = 1 - P(no success)

= 1 - f(0)

= 1 - 0.36

= 0.64

e. The expected value of a binomial distribution with n trials and probability of success p is given by:

E(X) = np

In this case, n = 2 and p = 0.4, so:

E(X) = 2 * 0.4 = 0.8

The variance of a binomial distribution is given by:

Var(X) = np(1-p)

So:

Var(X) = 2 * 0.4 * 0.6 = 0.48

The standard deviation is the square root of the variance:

SD(X) = sqrt(Var(X)) = sqrt(0.48) = 0.693.

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Answer:

c

Step-by-step explanation:

Looking at Jen's slope, we can see that the slope is steeper, but has a higher starting point, meaning that while she can hold more gas, she burns through her gas quicker.

On the other hand, DJ's car starts at a lower point on the graph, meaning their car holds less gas, But has a less steep slope, meaning their car has better mileage.

This means the answer is c: Jen's car holds more gasoline, but DJ's car gets better gas mileage

Answer: Which Option do You Drag and Drop into the Box?

Step-by-step explanation:

Let's call the number of rotations of the larger gear "L" and the number of rotations of the smaller gear "S". We know that when the larger gear completes 1 rotation, the smaller gear completes 1 3/4 rotations.

We can set up a proportion to solve for S:

S/1 3/4 = L/1/4

Simplifying the right side of the equation, we get:

S/1 3/4 = 4L

Multiplying both sides by 7/4 to get rid of the fraction on the left side, we get:

S = 28/4 L

Simplifying, we get:

S = 7L

This means that the smaller gear completes 7 rotations every time the larger gear completes 1 rotation.

Therefore, the correct value to drag and drop into the box is 7.

{Hope This Helps! :)}

The volume of the space inside the cylinder that is not filled with the right cone is 640π m³

Volume is the total space occupied by a solid shape.

To calculate the volume of the space inside the cylinder that is not filled with the right cone, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence the right option is A. 640π m².

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Answer:

x = -18.4

Step-by-step explanation:

3-8x=95-3x

add 3x to both sides

3-5x=95

subtract 3 from both sides

-5x=95-3

-5x=92

divide both sides by -5

x=-18.4

So the equation of the parabola in standard form is y = (5/4)x^2 - (7/4)x + 2.

One way to approach this problem is to use the standard form of the equation for a parabola, which is y = ax^2 + bx + c. We can set up a system of three equations using the three points given and solve for the coefficients a, b, and c.

Starting with the point (-2, 18):

18 = a(-2)^2 + b(-2) + c

18 = 4a - 2b + c

Using the point (0, 2):

2 = a(0)^2 + b(0) + c

2 = c

Using the point (4, 42):

42 = a(4)^2 + b(4) + c

42 = 16a + 4b + c

Substituting c = 2 into the second equation, we get:

2 = 2

This is always true, so it doesn't provide any additional information.

Substituting c = 2 into the first and third equations, we get:

18 = 4a - 2b + 2

42 = 16a + 4b + 2

Simplifying each equation:

9 = 2a - b

20 = 4a + b

Solving this system of equations, we get:

a = 5/4

b = -7/4

Substituting these values for a and b, and c = 2, into the standard form equation for a parabola, we get:

y = (5/4)x^2 - (7/4)x + 2

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The first step is to calculate the total area of 600 bricks.

Area of one brick = 12 inches x 18 inches = 216 square inches

Area of 600 bricks = 600 x 216 = 129,600 square inches

Next, we need to convert the height of the wall from feet to inches since the area of the bricks is in square inches.

10 feet = 120 inches

Now, we can divide the total area of the bricks by the height of the wall to find the length of the wall.

Length of the wall = Area of 600 bricks / Height of the wall
Length of the wall = 129,600 square inches / 120 inches
Length of the wall = 1080 inches

Finally, we can convert the length of the wall back to feet by dividing by 12 since there are 12 inches in a foot.

Length of the wall = 1080 inches / 12 inches/foot
Length of the wall = 90 feet

Therefore, the length of the wall is 90 feet.

To solve this problem, we need to use the formula for calculating area which is length x width. We also need to convert units from feet to inches and vice versa as necessary to ensure we are working with the same units throughout the problem.

The length of the wall is 90 feet.

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The value of x is equal to 0.8603 units.

In order to determine the adjacent side (value of x), we would apply the law of tangent because the given side lengths represent the opposite side and angles of a right-angled triangle.

tan(θ) = Opp/Adj

Where:

Based on the information provided in the image, we can logically deduce the following parameters:

Adj = x units.

Opp = 8.3 units.

By substituting the parameters into the tangent ratio formula, we have the following;

Tan16 = 8.3/x

x = 3tan16

x = 0.8603 units.

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The value of Tan θ is -5/12

Given that 8 Sin θ = 4 + Cos θ, we need to find Tan θ,

So,

8 Sin θ = 4 + Cos θ

Dividing by Cos θ,

8 Sin θ / Cos θ = (4 + Cos θ) / Cos θ

8 Tan θ = 4 Sec θ + 1

Squaring both sides,

64 Tan² θ = 16 Sec² θ + 1 + 8 Sec θ

64 Tan² θ - 16 Tan θ + 1 = 16 (1 + Sec² θ)

48 Tan² θ - 16 Tan θ - 15 = 0

4 Tan θ(12 Tan θ + 5) -3(Tan θ + 5) = 0

(12 Tan θ + 5) (4 Tan θ - 3) = 0

Tan θ = 3/4 or Tan θ = -5/12

Since Tan θ = 3/4 does not satisfy the equation so Tan θ = -5/12

Hence the value of Tan θ is -5/12

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When we subtract a velocity vector from another velocity vector, the result is B. another velocity.

When we subtract a velocity vector from another velocity vector, we are essentially finding the difference between the two velocities. This difference is also a velocity vector, but in a different direction and with a different magnitude. Therefore, the answer is another velocity, option B.

It is important to note that acceleration is a change in velocity, not the result of subtracting one velocity from another. Scalar refers to a quantity with only magnitude, whereas velocity is a vector quantity with both magnitude and direction. Displacement refers to the change in position of an object and is not directly related to subtracting velocity vectors.

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Given that QT is the perpendicular bisector of PR.The bisector of any line segment divides it into two equal parts, each of which has the same measure.To begin, let's define a few terms.

Angle bisector - An angle bisector is a line or segment that divides an angle into two equal parts.The given figure is shown below: We are given QT is the perpendicular bisector of PR. That means QT is perpendicular to PR and it bisects it. That is, it divides it into two equal halves.Suppose, PR = 2xFrom the given information, we know that the perpendicular bisector QT divides PR into two equal halves.

So,PQ = QR

Now, In right triangle

TPQ,QT² = TP² + PQ²QT² = TP² + QR² (since PQ = QR)QT² = TP² + (2x)² (since PQ = QR = 2x)QT² = TP² + 4x²

Also, In right triangle

TRQ,QT² = TR² + QR²QT² = TR² + (2x)²QT² = TR² + 4x²

We now have two equations:

QT² = TP² + 4x² QT² = TR² + 4x²

The above two equations can be equated:

TP² + 4x² = TR² + 4x²TP² = TR²

Thus, we can say that

TP = TRLet TP = TR = a

By Pythagoras theorem in right angled triangle

TPQ,TP² + PQ² = TQ²a² + (2x)² = QT²a² + 4x² = QT²

The answer is 4x² + a² = QT².

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Answer:

The angle between building 1 and building 3 at building 2 is not a right angle, and hence, the buildings do not form a right triangle.

Step-by-step explanation:

Answer: A and D

Step-by-step explanation: Its obvious.

Answer:

Square

Parallelogram

Step-by-step explanation:

Inner diagonals are all right angles and both diagonals are congruent.

Also, a square must be a parallelogram.

Answer:

[tex]y=4[/tex]

Step-by-step explanation:

Examining the stem and leaf plot, the number of drivers that travelled below 70 miles per hour is

A. 8

A stem and leaf plot is a type of data display used in statistics to organize and rank data while retaining individual data points.

It is a visual representation of a frequency distribution of numerical data where each value is split into a stem (usually the leftmost digits) and a leaf usually the rightmost digit).

Using the information we can write out the speed of drivers that drove below 70 miles per hour

54, 56, 59, 62, 62, 63, 64, and 68

This gives 8

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it takes Lindiwe's teacher 300 seconds to walk to her classroom and the break is 50 minutes long.

To convert 3 km to meters we multiply by 1000 (since there are 1000 meters in 1 km).

3 km = 3,000 meters

Therefore, Lindiwe walks 3,000 meters from home to school during weekdays.

3.2 To convert 5 minutes to seconds, we multiply by 60 (since there are 60 seconds in 1 minute).

5 minutes = 5 x 60 = 300 seconds

Therefore, it takes Lindiwe's teacher 300 seconds to walk to her classroom.

To find the length of Lindiwe's break, we subtract the start time from the end time:

11:20 - 10:30 = 0:50

The break is 50 minutes long.

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Answer:

972

Step-by-step explanation:

The required function be  y = 5000 - 250x.

Given that,

Amount of saving = $5000

Amount of withdraw and spend = $250

Number of months = x

If the total money in Ken's savings account after x number of months is represented by y,

Then, to calculate the entire amount in his savings account after x number of months, the program deducts 250x from the beginning amount of $5000.

Therefore, The function be,

y = 5000 - 250x

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Answer:

the other day I dey bro you doing today I hope