Q17. A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. The standard error of the mean is 1.30 b. 0.12 8.00 d. 0.80 None of the above

A community health association is interested in estimating the average number of maternity days women stay in the local hospital. A random sample is taken of 36 women who had babies in the hospital during the past year. Considering all the given values, the higher value of the interval is 3.870.

To construct a 98% confidence interval to estimate the average maternity stay in the hospital for all women who have babies in this hospital, we can use the following formula:
Confidence interval = sample mean +/- (t-value * population standard deviation / [tex]\sqrt{(sample size)}[/tex])
where the t-value is obtained from a t-distribution table for a 98% confidence level and 35 degrees of freedom (since we have a sample size of 36).
First, we need to calculate the sample mean:
Sample mean = (1+3+4+3+2+5+3+1+4+3+4+2+3+5+3+2+4+3+2+2+1+6+3+4+3+3+5+2+3+4+3+5+4+3+5+1) / 36 = 3.306
Next, we can find the t-value for a 98% confidence level and 35 degrees of freedom, which is approximately 2.429.
Plugging in the values, we get:
Confidence interval = 3.306 +/- (2.429 * 1.15 / [tex]\sqrt{(36)}[/tex]) = (3.306 +/- 0.564) = (2.742, 3.870)
Therefore, the higher value of the interval is 3.870.

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The amount you will have in five years at various compounding rates is :

Annually: $4,341.86

Quarterly: $4,388.91

Monthly: $4,406.64

Daily: $4,411.82

Continuously: $4,421.22

We can use the following formula to determine how much money you will have in five years at various compounding rates:

A = P(1 + r/n)(n*t)

where

Using this formula, we get:

Annually:

A = 3500(1 + 0.04/1)^(1*5) = $4,341.86

Quarterly:

A = 3500(1 + 0.04/4)^(4*5) = $4,388.91

Monthly:

A = 3500(1 + 0.04/12)^(12*5) = $4,406.64

Daily:

A = 3500(1 + 0.04/365)^(365*5) = $4,411.82

Continuously:

A = 3500e^(0.045) = $4,421.22

Therefore, the amount you will have in five years at various compounding rates is :

Annually: $4,341.86

Quarterly: $4,388.91

Monthly: $4,406.64

Daily: $4,411.82

Continuously: $4,421.22

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Answer:

below

Step-by-step explanation:

3. 2x² - 2x + 9 = y

a) The equation of the axis of symmetry is x = 0.5 (since it's the x-coordinate of the vertex)

b) To find the vertex, we need to complete the square:

2x² - 2x + 9 = y

2(x² - x) + 9 = y

2(x² - x + 1/4) + 9 - 2(1/4) = y

2(x - 1/2)² + 8.5 = y

So the vertex is at (0.5, 8.5).

c) The parabola opens up since the coefficient of x² is positive.

d) The vertex is the minimum point.

4. -x² + 10x = y

a) The equation of the axis of symmetry is x = 5 (since it's the x-coordinate of the vertex).

b) To find the vertex, we need to complete the square:

-x² + 10x = y

-(x² - 10x) = y

-(x² - 10x + 25 - 25) = y

-(x - 5)² + 25 = y

So the vertex is at (5, 25).

c) The parabola opens down since the coefficient of x² is negative.

d) The vertex is the maximum point.

The area of the regular pentagon with base area as 84.3 ft is derived to be equal to 224.3 square feet.

We have that the base area of the regular pentagon is 84.3 ft and each side is a rectangle with 7 ft by 4 ft dimension, so we calculate for the area of the figure as follows:

Area of one rectangle side = 7 ft × 4 ft = 28 ft²

Area of the five rectangle side = 5 × 28 ft² = 140 ft²

Area of the regular pentagon = 140 ft² + 84.3 ft

Area of the regular pentagon = 224.3 ft²

Therefore, the area of the regular pentagon with base area as 84.3 ft is derived to be equal to 224.3 square feet.

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The temperature of the turkey after 4.5 hours in the oven is 192°F, to the nearest degree.

We have,

We can use the given formula to solve for the value of k:

T = Ta + (To – Ta)e^{-kt}

Ta = 350°F (oven temperature),

To = 69°F (room temperature),

T = 110°F (temperature after 2 hours).

Plugging these values in and solving for k, we get:

110 = 350 + (69 - 350)e^{-2k}

-240 = -281e^{-2k}

0.855 = e^{-2k}

ln(0.855) = -2k

k = 0.211

Now that we know k, we can use the same formula to find the temperature of the turkey after 4.5 hours:

T = Ta + (To – Ta)e^{-kt}

Ta = 350°F,

To = 69°F

k = 0.211.

Plugging these values in and solving for T.

T = 350 + (69 - 350)e^{-0.211(4.5)}

T = 192

Thus,

The temperature of the turkey after 4.5 hours in the oven is approximately 192°F, to the nearest degree.

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Parabolic Cylinder, The given vector equation is: r(s, t) = (s sin(3t), s^2, s cos(3t))

To identify the surface, let's break down the components:
1. x(s, t) = s sin(3t)
2. y(s, t) = s^2
3. z(s, t) = s cos(3t)

Now, let's eliminate the parametric s by solving for s in either the x or z component and substituting it into the y component. Since y(s, t) = s^2,

we'll solve for s in the z component:
s = z / cos(3t)
Now, substitute this expression for s into the y component equation:
y = (z / cos(3t))^2
y = z^2 / cos^2(3t)

Now we have an equation relating y and z with t as a parameter. This equation represents a parabolic cylinder, as it is quadratic in one variable (y) and linear in the other (z). The parameter t allows the parabolic shape to be rotated about the z-axis.

So, the identified surface for the given vector equation r(s, t) = (s sin(3t), s^2, s cos(3t)) is a parabolic cylinder.

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The measure of the angle in degrees for ½ rotation counterclockwise is -180 degrees.

Measuring angles is done using simple geometric tools such as a protractor and compass. This tool helps to find accurate measurements of angles. A protractor helps make precise measurements of angles, while compasses help make up angles. Measuring angles is done in three ways - degrees, radians and revolutions.

To find the measure of the angle for a ½ rotation counterclockwise, follow these steps:

1. Understand that a full rotation is 360 degrees.
2. Since you need to find the measure of ½ rotation, simply divide 360 degrees by 2.
3. Keep in mind that counterclockwise rotations have a positive angle measure.

So, the measure of the angle for a ½ rotation counterclockwise is:

+ (360 degrees ÷ 2) = +180 degrees

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Answer:

f(0)=-9 and f(3)=-3

Step-by-step explanation:

f(-3)=15 - so to solve this we have to replace x with -3, which would equal:

2(-3)-9=-15.  -15 doesn't equal 15, so this is incorrect.

f(-1)=-11 Substitute x for -1: 2(-1)-9=-12.  -12 doesn't equal -11, so this is also incorrect.

f(0)=-9 Substitute x for 0.  2(0)-9= -9.  -9 does equal -9, so this is correct.

f(2)=5 Substitute x for 2.  2(2)-9=-5. This isn't correct.

f(3)=-3 Substitute x for 3.  2(3)-9=-3.  This is also correct because -3 does equal -3.

Hope this helps!  :)

The value  of the trigonometric tan of tan 26 degrees to the nearest ten thousandth is

The tangent (tan) of an angle in a right triangle is known as the measure of the ratio of the length of the side opposite the angle, against that of the side adjacent to it.

Assuming a right-angled triangle with an acute angle of 26 degrees, the tangent of this angle is calculated by comparing the measurements of the opposite and the adjacent.

A scientific calculator or trigonometric table can be employed to determine the approximate value of Tan 26, which is approximately 0.4877326.

Nearest ten thousandth is four decimal place which is written as 0.4877

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In summary, fy(a,b) is the slope of the tangent line to the surface defined by f(x, y) at the point (a, b) in the y-direction.

The given expression represents the partial derivative of f(x, y) with respect to y, evaluated at (a, b):

fy(a,b) = lim┬(y→b)⁡〖[f(a,y) - f(a,b)]/(y - b)〗

Geometrically, this partial derivative represents the slope of the tangent line to the surface defined by f(x, y) at the point (a, b) in the y-direction.

To see why this is the case, consider the following argument:

Let L be the limit in the expression given above.

Let h = y - b be the change in the y-coordinate from b to y.

Then, we can rewrite the limit as:

fy(a,b) = lim┬(h→0)⁡〖[f(a,b + h) - f(a,b)]/h〗

This expression represents the average rate of change of f(x, y) with respect to y over the interval [b, b + h].

As h approaches 0, this average rate of change approaches the instantaneous rate of change, which is the slope of the tangent line to the surface defined by f(x, y) at the point (a, b) in the y-direction.

Therefore, fy(a,b) is the partial derivative of f(x, y) with respect to y, evaluated at (a, b).

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Let's discover the solution to your problem

Given that, the ratio of red marbles and blue marbles is 5 to 3 which can be written as 5:3. In simple words we can say that for every 5 red marbles, there are 3 blue marbles.

Now we need to find the total number of marbles. In order to find that, we must find the sum of red and blue marbles.

5+3=8

In conclusion, we can say that 3 of every 8 marbles in the bag are blue. Hence the fraction of the marbles that were blue 3/8

Answer:

2 olives

Step-by-step explanation:

To find the answer, just divide 22 by 4, and the remainder will be your answer.

The remainder is 2.

~~~Harsha~~~

We can say with 99% confidence that the true population mean commute time to work falls within the range of 29.95 to 37.25 minutes. The margin of error of 1.83 indicates that the sample mean of 33.6 minutes may differ from the true population mean by up to 1.83 minutes in either direction.

To construct a 99% confidence interval for the population mean commute time to work, we need to use the T distribution since the sample size is less than 30. From the given information, the sample mean commute time to work is 33.6 minutes and the standard deviation is 7.1 minutes.

The formula for the confidence interval is:

(sample mean) +/- (t-value)(standard error)

The t-value is found using a T distribution table with a degree of freedom of n-1 (29-1=28) and a confidence level of 99%. This gives us a t-value of 2.763.

The standard error is calculated as the standard deviation divided by the square root of the sample size. So,

standard error = 7.1/sqrt(29) = 1.32

Plugging in the values, we get:

33.6 +/- 2.763(1.32)

This simplifies to:

33.6 +/- 3.65

Therefore, the 99% confidence interval for the population mean commute time to work is (29.95, 37.25).

The margin of error of the mean is the difference between the upper and lower bounds of the confidence interval divided by 2. In this case, the margin of error is (37.25-29.95)/2 = 3.65/2 = 1.83.

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The solution to the line diagram are:

1) AB

2) Point B

3) A, B and C are the three collinear points

4) ABD

1) A line can be defined by two points that are connected by the given line.

We can see that the line r connects the points A and B, then we can call this line as:

AB (the notation usually uses a double arrow in top of the letters)

2) In the image we can see that lines r and s intersect at the point B, then another name for that intersection is: B.

3) 3 collinear points are 3 points that are connected by a single line, an example of this can be the points A, B and C.

4) A plane can be defined by a line and a point outside the line.

For example, we can choose the line AB and the point D, that does not belong to the line.

Then we can call the plane as ABD.

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i) The variation of parameters method can be used to find the second solution. Let y = u(x)cos(2x), then y' = u'(x)cos(2x) - 2u(x)sin(2x), and y'' = u''(x)cos(2x) - 4u'(x)sin(2x) - 4u(x)cos(2x).

Substituting these into the differential equation, we get:

u''(x)cos(2x) - 4u'(x)sin(2x) - 4u(x)cos(2x) + 4u(x)cos(2x) = 0

Simplifying, we get:

u''(x)cos(2x) - 4u'(x)sin(2x) = 0

Dividing by cos(2x), we get:

u''(x) - 4tan(2x)u'(x) = 0

This is a first-order linear differential equation, which can be solved using an integrating factor. The integrating factor is e^(-2ln|cos(2x)|) = cos^(-2)(2x). Multiplying both sides by this, we get:

cos^(-2)(2x)u''(x) - 4cot(2x)cos^(-2)(2x)u'(x) = 0

The left-hand side is the derivative of cos^(-2)(2x)u'(x) with respect to x, so we can integrate both sides to get:

cos^(-2)(2x)u'(x) = C1

where C1 is a constant of integration. Integrating again, we get:

u(x) = C1int(cos^(-2)(2x)dx) + C2

This integral can be evaluated using the substitution u = sin(2x), du/dx = 2cos(2x), to get:

u(x) = C1arcsin(tan(2x)) + C2

Therefore, the second linearly independent solution is y = u(x)cos(2x) = (C1arcsin(tan(2x)) + C2)cos(2x).

ii) The general solution is y = c1cos(2x) + c2[(arcsin(tan(2x)))cos(2x)], where c1 and c2 are constants.

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The ratio of the volumes of two spheres is proportional to the cube of their radii (or diameters), hence it is 125:1.

Since planet A has a diameter that is approximately 10 times that of planet B, its radius is 5 times that of planet B.

Therefore, the ratio of the volumes of planet A to planet B can be calculated as follows:

(Volume of A) / (Volume of B) = (4/3)πrA³ / (4/3)πrB³

where rA is the radius of planet A and rB is the radius of planet B.

Since rA = 5rB, we can substitute this into the equation above:

(Volume of A) / (Volume of B) = (4/3)π(5rB)³ / (4/3)πrB³

Simplifying the equation by canceling out the common terms, we get:

(Volume of A) / (Volume of B) = 5³

Therefore, the ratio of the volumes of planet A to planet B is 125:1. In other words, planet A has a volume that is 125 times greater than that of planet B.

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The correct answer is (d) 64%. The coefficient of correlation (r) squared represents the percentage of variation in the dependent variable that is explained by the variation in the independent variable.

In this case, r squared is 0.8 squared, which equals 0.64 or 64%. Therefore, 64% of the variation in the dependent variable can be explained by the variation in the independent variable.
if the coefficient of correlation is 0.8, the percentage of variation in the dependent variable explained by the variation in the independent variable can be found by calculating the coefficient of determination (R²). In this case, R^2 = (0.8)² = 0.64, which means that 64% of the variation in the dependent variable is explained by the variation in the independent variable. Therefore, the correct answer is:

d. 64%

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The cylinders that have the same volume as the one given are: option C and option F.

The volume of a cylinder = V = πr²h

Note: r is the radius and h is the height of the cylinder.

The cylinder given has:

h = 32 m

r = 20/2 = 10 m

V = π* 10² * 32 ≈ 10053.1 m³

Option A:

h = 16 m

r = 40/2 = 20 m

V = π*20²*16 ≈ 20106.2 m³

Option B:

h = 64 m

r = 5/2 = 2.5 m

V = π * 2.5² * 64 ≈ 1256.6 m³

Option C:

h = 8 m

r = 40/2 = 20 m

V = π * 20² * 84 ≈ 10053.1 m³

Option D:

h = 64 m

r = 10/2 = 5 m

V = π * 5² * 64 ≈ 5026.55

Option E:

h = 20 m

r = 32/2 = 16 m

Volume = π * 16² * 20 ≈ 16084.95 m³

Option F:

h = 128 m

r = 10/2 = 5 m

Volume = π * 5² * 128 ≈ 10053.1 m³

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If the company uses direct materials costs as its activity base to apply overhead, the predetermined overhead rate it should use during the year is $1.42 per direct materials cost.

The predetermined overhead rate is the allocation rate used to apply the estimated cost of manufacturing overhead to cost objects.

The predetermined overhead rate is the quotient of the estimated manufacturing overhead cost and the activity base.

Estimated total direct materials costs = $1,920,000

Estimated total overhead costs = $2,726,400

Predetermined overhead rate = $1.42 ($2,726,400 ÷ $1,920,000)

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answer:

1.78 = 1 + 0.7 + 0.08

step-by-step explanation:

1.78 = (1 • 100) + (7 • 1/101) + (8 • 1/102)

1.78 = (1 • 1) + (7 • 1/10) + (8 • 1/100)

1.78 = 1 + 7/10 + 8/100

1.78 = 1 + 0.7 + 0.08

Answer:

x = 45

Step-by-step explanation:

y is the score on the test. To find the amount of time to study he needs to get a score of 90 on his next test, we need to find x ("y=1/5x+81 models his score after studying for x minutes.")

Initial equation
[tex]y = \frac{1}{5}x + 81[/tex]

Replace y with 90
[tex]90 = \frac{1}{5}x + 81[/tex]

Find for x
[tex]90 - 81 = \frac{1}{5}x[/tex]
[tex]9 = \frac{1}{5}x[/tex]
[tex]5 * 9 = 5 * \frac{1}{5}x[/tex]
[tex]45 = x[/tex]

Therefore, Jonas needs 45 minutes to get 90 on his next test.

The A matrix for this transformation has 2 rows and 5 columns.

The A matrix has M rows and N columns, where M is the number of rows in A and N is the number of columns in A. Since the transformation goes from R5 to R2, the codomain is R2, which means that the A matrix has 2 rows in the codomain. However, we do have number of columns for 2 columns and 2 rows.

A transformation that goes from R5 to R2 has a matrix A with the following dimensions:

- The number of columns in A corresponds to the dimension of the domain, which is R5. So, A has 5 columns.
- The number of rows in A corresponds to the dimension of the codomain, which is R2. So, A has 2 rows.

Therefore, the A matrix for this transformation has 2 rows and 5 columns.

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Answer:60

Step-by-step explanation:

We can start by splitting the figure into 3 rectangals. one with side lengths 4,6 another with 5,4 and another with 4,4. Then we get 24+20+16=60

For a 95% lower confidence bound, we only need the lower limit. The 95% lower confidence bound on the mean life of a 75-watt light bulb is approximately 1003.045 hours.

To construct a 95% two-sided confidence interval on the mean life, we can use the formula:

CI = x ± tα/2 * (σ/√n)

where x is the sample mean (1014 hours), σ is the population standard deviation (25 hours), n is the sample size (20), and tα/2 is the critical value from the t-distribution with (n-1) degrees of freedom at a significance level of α/2 = 0.025 (since we want a 95% confidence interval).

Using a t-table or calculator, we can find that t0.025,19 = 2.093. Substituting these values into the formula, we get:

CI = 1014 ± 2.093 * (25/√20) = (970.5, 1057.5)

Therefore, we are 95% confident that the true mean life of the 75-watt light bulb is between 970.5 hours and 1057.5 hours.

To construct a 95% lower confidence bound on the mean life, we can use the formula:

LB = x - tα * (σ/√n)

where LB is the lower bound, x is the sample mean, σ is the population standard deviation, n is the sample size, and tα is the critical value from the t-distribution with (n-1) degrees of freedom at a significance level of α = 0.05 (since we want a one-sided confidence bound).

Using the same values as before, we can find that t0.05,19 = 1.734. Substituting these values into the formula, we get:

LB = 1014 - 1.734 * (25/√20) = 991.2

Therefore, we are 95% confident that the true mean life of the 75-watt light bulb is at least 991.2 hours.

Step 1: Identify the given information
- Sample mean (x) = 1014 hours
- Sample size (n) = 20 bulbs
- Population standard deviation (σ) = 25 hours
- Confidence level = 95%

Step 2: Calculate the standard error (SE)
SE = σ / √n = 25 / √20 = 5.590

Step 3: Find the critical value (z) for the 95% confidence level (two-sided)
For a 95% confidence interval, the z-value is 1.96.

Step 4: Calculate the margin of error (ME)
ME = z * SE = 1.96 * 5.590 = 10.955

Step 5: Construct the 95% confidence interval
Lower limit = x - ME = 1014 - 10.955 = 1003.045
Upper limit = x + ME = 1014 + 10.955 = 1024.955

The 95% two-sided confidence interval on the mean life of a 75-watt light bulb is approximately (1003.045 hours, 1024.955 hours).

Step 6: Construct the 95% lower confidence bound
For a 95% lower confidence bound, we only need the lower limit.
The 95% lower confidence bound on the mean life of a 75-watt light bulb is approximately 1003.045 hours.

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Our test statistic t (-1.86) is greater than the critical value of t (-2.602), we fail to reject the null hypothesis. This means that we do not have sufficient evidence to conclude that state employees earn on average less than federal employees at the 0.01 level of significance.

To determine if state employees earn on average less than federal employees, we can perform a hypothesis test using the given information. Let's denote the population mean salary of federal government employees by μ and the population mean salary of state employees by μ1. We want to test the null hypothesis that the average salary of state employees is equal to or greater than the average salary of federal employees, against the alternative hypothesis that the average salary of state employees is less than the average salary of federal employees. This can be expressed as:

H0: μ1 >= μ

Ha: μ1 < μ

We will use a one-tailed t-test with a 0.01 level of significance, since we are testing for a difference in one direction (state employees earning less than federal employees) and the sample size is small (n=32).

First, we need to calculate the test statistic t, which can be calculated using the formula:

t = X - μ) / (s / sqrt(n))

where X is the sample mean, s is the sample standard deviation, n is the sample size, and μ is the hypothesized population mean. In this case, X= $59,000, s = $1500, n = 32, and μ = $59,593.

Plugging in these values, we get:

t = (59,000 - 59,593) / (1500 / sqrt(32)) = -1.86

Next, we need to find the critical value of t from the t-distribution table with 31 degrees of freedom (since n-1=31 for a sample size of 32) and a one-tailed significance level of 0.01. The critical value is -2.602.

Since our test statistic t (-1.86) is greater than the critical value of t (-2.602), we fail to reject the null hypothesis. This means that we do not have sufficient evidence to conclude that state employees earn on average less than federal employees at the 0.01 level of significance

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Answer: 371

Step-by-step explanation:

you use the formula V=lwh to calculate the volume

so that's 9 1/2 times 3 times 13 1/2

True. In 2016, the percentage of the ageing population (55 years or older) in state prisons surpassed the percentage of people aged 18-24 for the first time.

This trend reflects the overall growth of the ageing population within the United States and is a result of various factors such as longer life expectancy, harsher sentencing laws, and an increase in older individuals being convicted of crimes.
As the ageing population in state prisons continues to grow, it poses several challenges for the correctional system. These challenges include providing appropriate healthcare and accommodations for older inmates and addressing the specific needs of this population, such as mobility assistance and specialized medical care.
In conclusion, the shift in the age demographics of state prisons has significant implications for the management and administration of correctional facilities. It is crucial to address the unique needs of the ageing population within these institutions and adapt policies and practices accordingly to ensure the well-being and fair treatment of all inmates, regardless of their age.

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The number 1.1 in this scenario is the population standard deviation, which represents the variability of the entire population.

A standard deviation (or σ) is a measure of how dispersed the data is in relation to the mean. Low standard deviation means data are clustered around the mean, and high standard deviation indicates data are more spread out.

The sample standard deviation of 0.92 is an estimate of the population standard deviation based on the sample data. The sample mean of 5 is also an estimate of the population mean based on the sample data. By using the sample statistics, we can make inferences about the population parameters with a certain level of confidence.

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Answer:

0.36

Step-by-step explanation:

first number is who put no and safety which is 192 then the total of selected no which is 534

at least that what i got sorry if wrong

The domain is [-1, ∞)

The range is [2, ∞)

Here we have the function:

m(x) = √(x + 1) + 2

Remember that we can't evaluate something smaller than zero in a square root, then if:

x + 1 = 0

x = -1

The domain is the set [-1, ∞)

Now the square root is increasing, and its minimum is at zero when x = -1, then the minimum of the range is the costant term y = 2.

The range is [2, ∞)

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