What is the particular solution to the differential equation dy/dx = 4/(x-1)2e2y with the initial condition y(-3) = 0?

Answer: 200

Step-by-step explanation:

1 Canadian dollar  buys 82c in US

1 dollar = 100c

=> 100 c  Canadian  =    82c in US

=> 100 Canadian dollar  buys 82 dollar  in US

Canadian dollar required to buy 82 dollar  in US    = 100

=> Canadian dollar required to buy 1 dollar  in US    = 100/82

=> Canadian dollar required to buy 164 dollar  in US  = 164 x 100/ 82

= 2  x 100

= 200 $

cost 200 in Canadian dollars   to buy a Walkman advertised for $164.00 in the USA

The sample size of only 5, it's difficult to make strong conclusions about the differences in pricing between the two stores.

To compare the textbook prices for two online bookstores, we can calculate the mean and standard deviation of the textbook prices for each store.

For store A:

Mean = (115 + 43 + 99 + 80 + 119) / 5 = $91.20

Standard deviation = 34.48

For store B:

Mean = (110 + 40 + 99 + 69 + 109) / 5 = $85.40

Standard deviation = 29.80

From this, we can see that the mean textbook price for store A is higher than that of store B, but store A also has a higher standard deviation, indicating greater variability in prices.

However,

With a sample size of only 5, it's difficult to make strong conclusions about the differences in pricing between the two stores.

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The coordinate vector of p(t) = 1 + 3t + 6t^2 relative to the basis B = {1 + 2t, t + 2t^2} is [p(t)]_B = (1, 1).

The coordinate vector of p(t) = 1 + 3t + 6t^2 relative to the basis B = {1 + 2t, t + 2t^2}, we need to express p(t) as a linear combination of the basis vectors.

Step 1: Write p(t) as a linear combination of the basis vectors.
p(t) = c1(1 + 2t) + c2(t + 2t^2)

Step 2: Equate the coefficients of the terms in p(t) to the coefficients in the linear combination.
1 = c1
3 = 2c1 + c2
6 = 2c2

Step 3: Solve the system of equations for c1 and c2.
From the first equation, we know that c1 = 1.
Now substitute c1 into the second equation:
3 = 2(1) + c2
c2 = 1

Step 4: Substitute c2 into the third equation:
6 = 2(1)
This confirms that our values for c1 and c2 are correct.

Step 5: Write the coordinate vector with the coefficients c1 and c2.
[p(t)]_B = (c1, c2) = (1, 1)

In conclusion, the coordinate vector of p(t) = 1 + 3t + 6t^2 relative to the basis B = {1 + 2t, t + 2t^2} is [p(t)]_B = (1, 1).

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The total amount that Allam would leave for the meal, including sales tax and tip, would be $22

In Wisconsin, sales tax is added to the price of most goods and services, including meals at restaurants. Sales tax is a percentage of the total price of the meal, and in Wisconsin, it is 5%. This means that if Allam's meal cost $20, the sales tax would be $1.

However, when it comes to leaving a tip, it is customary to calculate the amount based on the price of the meal before the sales tax is applied. This is because the tip is meant to be a percentage of the service received and the quality of the food, which are not affected by the sales tax.

So, if Allam's meal cost $20 before the sales tax was added, the tip amount would be calculated as 5% of $20, which is $1.

=> ($20+ $1 + $1 ) = $22.

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The statements that accurately characterize a uniform distribution are Areas within the distribution represent probabilities and The area inside the rectangle (i.e the frequency polygon) must be one.



1. In a uniform distribution, the probability of an event occurring within a certain range is proportional to the size of that range. This means that the area under the curve of the distribution within a certain range represents the probability of an event occurring within that range.

2. The area inside the rectangle (i.e the frequency polygon) must be one because the total probability of all possible events within the distribution must be equal to one.

The other statements are not accurate for a uniform distribution because:

- The mean and median of a uniform distribution are the same, so the statement "the mean is different from the median of the distribution" is false.
- The height of a uniform distribution is constant, so the statement "the height of the distribution changes depending on the value of x" is also false.

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Answer:

1.05^7 = 1.407

Every week, the mass of the starfish increases by about 40.7%, or by a factor of about 1.41.

To calculate the required minimum distribution (RMD) for 2022, we need to know the balance of Tim's retirement account(s) as of December 31, 2021.

The RMD for 2022 is calculated by dividing the account balance by a distribution period based on Tim's age. According to the IRS Uniform Lifetime Table, the distribution period for a 68-year-old is 23.8 years.

Assuming Tim has a retirement account balance of $500,000 as of December 31, 2021, the RMD for 2022 would be:

RMD = $500,000 / 23.8 = $21,008.40

Therefore, Tim's required minimum distribution for 2022 that must be distributed in 2023 is $21,008.40.

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The probability of at least one card being a heart is 0.546 or approximately 54.6%.

To solve this problem, we can use the concept of complementary probability, which states that the probability of an event happening is equal to one minus the probability of the event not happening.

The probability of not getting a heart on the first draw is 39/52, since there are 39 non-heart cards out of a total of 52 cards. The same probability applies to the second draw, as the card is replaced. Therefore, the probability of not getting a heart on both draws is (39/52) x (39/52) = 0.454.

Using the complementary probability concept, the probability of at least one card being a heart is 1 - 0.454 = 0.546 or approximately 54.6%.

This means that if we were to repeat this experiment many times, we would expect to get at least one heart card in more than half of the trials.

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The derivative of the function J using the first principle definition is: J'(x) = lim (J(x+h) - J(x)) / h as h approaches 0.

To find the derivative of the function J using the first principle definition, we start by applying the formula f'(a) = lim (f(x) - f(a)) / (x - a) to the function J. We substitute x+h for x and a for x, giving us f'(a) = lim (J(x+h) - J(x)) / h as h approaches 0. This formula tells us that the derivative of J at a point x is equal to the limit of the difference quotient (J(x+h) - J(x)) / h as h approaches 0.

To find the value of the derivative of J at any given point x, we need to evaluate this limit. This can be done by applying algebraic manipulations, taking common factors, and using limit laws. Once we have evaluated the limit, we get the value of the derivative of J at the point x. This process is called finding the derivative of J using the first principle definition.

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The degrees of freedom for the treatment source of variation would be 2 (number of treatments - 1), and the degrees of freedom for the error source of variation would be 15 (total number of observations - number of treatments).

To explain why, degrees of freedom represent the number of independent pieces of information that are available to estimate a statistic. In the case of ANOVA, the degrees of freedom for the treatment source of variation are calculated by subtracting 1 from the number of treatments because the treatment means are estimated from the sample data and are therefore subject to one constraint (the grand mean).

The degrees of freedom for the error source of variation are calculated by subtracting the number of treatments from the total number of observations because the error term represents the variability that is not explained by the treatment means and is estimated from the differences between the individual observations and their respective treatment means.

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A variable that is used as a flag to indicate when a condition becomes true or false is normally referred to as a Boolean variable.

Boolean variables can hold only two possible values: true or false. These variables are often used in programming languages to control the flow of a program, allowing developers to create conditional statements and logical operations.

For instance, if a programmer wants to execute a certain piece of code only when a specific condition is met, they can use a Boolean variable to track the status of that condition. When the condition becomes true, the Boolean variable is set to "true" and the corresponding code is executed. Conversely, when the condition is false, the Boolean variable is set to "false" and the code is skipped.

In conclusion, Boolean variables are an essential tool in programming, helping developers create more efficient and flexible code by allowing them to manage the flow of a program based on various conditions.

These simple true or false values make it easy to understand and implement logical statements and conditional execution, leading to more reliable and effective software applications.

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The sine, cosine and tangent of angle A are given as follows:

For an angle [tex]\theta[/tex] the unit circle is a circle with radius 1 containing the following set of points:

[tex](\cos{\theta}, \sin{\theta})[/tex].

Considering the x and y-coordinates of the point, the sine and the cosine are given as follows:

The tangent is given by the division of the sine by the cosine, hence:

[tex]\tan{A} = \frac{\frac{1}{2}}{\frac{\sqrt{3}}{2}}[/tex]

[tex]\tan{A} = \frac{1}{\sqrt{3}} \times \frac{\sqrt{3}}{\sqrt{3}}[/tex]

[tex]\tan{A} = \frac{\sqrt{3}}{3}[/tex]

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Using the sum of a geometric series we can say that the sum of the series that has this repeating decimal 12/5.

Let us first define a geometric sequence before learning the geometric sum formula. A geometric sequence is one in which each phrase has a constant ratio to the word before it. A geometric sequence with a finite number of terms with the initial term a and the common ratio r is often expressed as a, ar, ar2,..., arn-1. A geometric sum is the sum of the geometric sequence's terms.

The geometric sum formula is the formula for calculating the sum of all the terms in a geometric sequence. There are two geometric sum formulae. The first is used to calculate the sum of the first n terms of a geometric sequence, while the second is used to calculate the sum of an infinite geometric sequence.

[tex]\sum \frac{\theta(-2)^n-6^n}{\theta^n} =\sum(\frac{\theta(-2)^n}{\theta^n} -\frac{6^n}{\theta^n} )[/tex]

= [tex]\sum \frac{(\theta(-2)^n-6^n}{\theta^n} {\theta^n} )[/tex]

= [tex]\sum (\theta(\frac{-1}{4} )^n)-\sum(\frac{3}{4} )^n[/tex]

=[tex]\theta (\frac{1}{\frac{5}{4} } )-(\frac{1}{\frac{1}{4} } )[/tex]

= [tex]\theta(\frac{4}{5} )[/tex]

= 32/5 - 4 = 32-20/5 = 12/5

Therefore,

[tex]\sum \frac{\theta(-2)^n-6^n}{\theta^n}[/tex] = 12/5.

Therefore, the sum is given as 12/5.

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Investment X earns the greater amount of interest over a period of 2 years.

Simple interest is a method of calculating interest on an amount for n period of time with a rate of interest of r. It is calculated with the help of the formula,

SI = PRT

where SI is the simple interest, P is the principal amount, R is the rate of interest, and T is the time period.

Let's consider that Ian invests in X, then:

Principle amount, P = $6,000
Time, T = 2 Years

Rate of Interest, R = 4.5% at simple Interest = 0.045

The interest earned is:

Interest = PRT = $6,000 × 0.045 × 2 = $540

Now, consider that Ian invests in Y, then:

Principle amount, P = $6,000
Time, n = 2 Years

Rate of Interest, R = 4% at Compound Interest = 0.04

The interest earned is:

Interest = P(1+R)ⁿ - P

            = $6,000(1+0.04)² - $6,000

            = $489.6

Since $540>$489.6, therefore, Investment X earns the greater amount of interest over a period of 2 years.

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Steven would need to repeat the process at least 6 times.

Now, we can start by finding out how much of the original water is left after one cleaning.

When Steven replaces 2/3 of the water with new water,

that means 1/3 of the original water is left.

Hence, After two cleanings, the amount of original water left would be;

⇒ (1/3) × (1/3) = 1/9.

This means that after two cleanings,

⇒ 1 - 1/9

=  8/9 of the water is new water.

To find out how many times Steven needs to repeat the process to get at least 95% new water, we can formulate an equation:

(2/3)ⁿ ≤ 0.05

where n is the number of times Steven needs to repeat the process.

Using logarithms, we can solve for n:

n ≤ log(0.05) / log(2/3)

n ≤ 5.53

Since n needs to be a whole number,

Hence, Steven would need to repeat the process at least 6 times.

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The domain at which the function is decreasing is (-∞, -5).

We have,

From the graph,

We see that there are two parts to the function:

Increasing and decreasing part.

Now,

The y-values are the function and the x-values are the domains.

So,

The function is decreasing from -∞ to x = -5 and increasing from x = -5 to ∞.

Thus,

The domain at which the function is decreasing is (-∞, -5).

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The equation of the ellipse is (x²/9) + (y²/4) = 1.

The center of the ellipse is at the origin, so we can use the standard form of an ellipse:

(x²/a²) + (y²/b²) = 1

where a denotes the semi-major axis length and b the semi-minor axis length The vertices of the ellipse are at (-a, 0) and (a, 0), and the co-vertices are at (0, -b) and (0, b).

In this case, the vertex is at (-3, 0), which means that the length of the semi-major axis is 3. The co-vertex is at (0, 2), which means that the length of the semi-minor axis is 2.

(x²/3²) + (y²/2²) = 1

Simplifying:

(x²/9) + (y²/4) = 1

So, the equation of the ellipse is (x²/9) + (y²/4) = 1.

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Given question is incomplete, the complete question is given below:

Write an equation of an ellipse in standard form with the center at the origin and with the given characteristics.

vertex at (-3,0) and co-vertex at (0, 2)

The information obtained from the hypothesis test can be used to help with scheduling at the doctor's office by allowing for a larger buffer time between patient appointments to account for the increased variability in waiting times.

a. The null hypothesis is that the variance of waiting times is equal to the originally thought value, and the alternative hypothesis is that the variance of waiting times is greater than the originally thought value.

Null hypothesis: σ = [tex]3.4^2[/tex] = 11.56

Alternative hypothesis: σ > 11.56

b. It is a right-tailed test.

c. We use the chi-square test for variance.

d. Degrees of freedom = n - 1 = 30 - 1 = 29

Level of significance (α) = 0.01

e. The chi-square test statistic is calculated as:

χ2 = (n - 1) * S^2 / σ2

Where S is the sample standard deviation and σ is the hypothesized population standard deviation.

Substituting the values, we get:

χ = 29 * (4.1) / (3.4)2 = 49.87

The chi-square distribution curve for 29 degrees of freedom with a right-tailed test and α = 0.01

The critical value for a right-tailed test with 29 degrees of freedom and α = 0.01 is 43.82.

f. The p-value for this problem is the probability of getting a chi-square value greater than or equal to 49.87 with 29 degrees of freedom.

This can be found using a chi-square distribution table or a calculator.

The p-value turns out to be approximately 0.002 (rounded to three decimal places).

g. We reject the null hypothesis since the calculated chi-square value of 49.87 is greater than the critical value of 43.82.

h. We reject the null hypothesis at the 1% level of significance since the p-value of 0.002 is less than the level of significance of 0.01.

This means that there is strong evidence that the variance of waiting times is greater than the originally thought value.

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Answer:

There is no value of x and y.

Step-by-step explanation:

To solve the equation 2y + 7x = -5 for y and x, we can use the following steps:

1.

Isolate y on one side of the equation by subtracting 7x from both sides:

2y = -7x - 5

2.

Divide both sides by 2 to get y by itself:

y = (-7/2)x - (5/2)

3.

To find x, we can substitute the value of y we just found into the original equation:

2(-7/2)x + 7x = -5

4.

Simplify and solve for x:

-7x + 7x = -5

0 = -5

Since this equation has no solution, there is no value of x and y that will satisfy it.

Answer:

1. Acute

2. Right

3. Obtuse

4. Vertical

5. Neither

6. Adjacent

7. Adjacent

8. Neither

9. Vertical

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1/4 is the scale factor of dilation

Dilation is a transformation, which is used to resize the object.

Dilation is used to make the objects larger or smaller.

Scale Factor is defined as the ratio of the size of the new image to the size of the old image.

Let us consider L and L' coordinates to find scale factor

L has coordinates (-8, 8)

If we multiply the x and y coordinates with 1/4 we get (-2, 2)

Hence, 1/4 is the scale factor of dilation

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To show that y⃗()=⎡⎣⎢⎢2−−⎤⎦⎥⎥ is a solution to the system of linear homogeneous differential equations, we need to substitute the values of y1, y2, and y3 from the given y⃗() vector into the equations for y′1, y′2, and y′3. If y⃗() satisfies these equations, it is a solution to the system.

Substituting the values of y1, y2, and y3 from y⃗() into the equation for y′1=2y1+y2+y3 gives:

y′1 = 2(2) + (-1) + (-1) = 2

So, the value of each term in the equation y′1=2y1+y2+y3 in terms of the variable is: 2 + 0x + 0x

Similarly, substituting the values of y1, y2, and y3 from y⃗() into the equation for y′2=y1+y2+2y3 gives:

y′2 = (2) + (-1) + 2(-1) = -2

So, the value of each term in the equation y′2=y1+y2+2y3 in terms of the variable is: 0x - 2 + 0x

Finally, substituting the values of y1, y2, and y3 from y⃗() into the equation for y′3=y1+2y2+y3 gives:

y′3 = (2) + 2(-1) + (-1) = -1

So, the value of each term in the equation y′3=y1+2y2+y3 in terms of the variable is: 0x + 0x - 1

Therefore, we have shown that y⃗()=⎡⎣⎢⎢2−−⎤⎦⎥⎥ is a solution to the system of linear homogeneous differential equations.
Given y⃗() = [2, -, -], we want to show it's a solution to the system of linear homogeneous differential equations:

1. y′1 = 2y1 + y2 + y3
2. y′2 = y1 + y2 + 2y3
3. y′3 = y1 + 2y2 + y3

Step 1: Identify the components of y⃗()
y1 = 2, y2 = -, y3 = -

Step 2: Substitute the components into each equation:

Equation 1: y′1 = 2(2) + (-) + (-) = 4 - 1 - 1 = 2
Equation 2: y′2 = 2 + (-) + 2(-) = 2 - 1 - 2 = -1
Equation 3: y′3 = 2 + 2(-) + (-) = 2 - 2 - 1 = -1

Step 3: Rewrite the equations in terms of the variable:

y′1 = 2y1 + y2 + y3 = 2(2) + (-) + (-) = 2
y′2 = y1 + y2 + 2y3 = 2 + (-) + 2(-) = -1
y′3 = y1 + 2y2 + y3 = 2 + 2(-) + (-) = -1

As the equations hold true, y⃗() = [2, -, -] is a solution to the system of linear homogeneous differential equations.

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The area of the base of the cylindrical basket is approximately 10ft²

A cylinder is simply a 3-dimensional shape having two parallel circular bases joined by a curved surface.

The volume of a cylinder is expressed as;

V = π × r² × h

Where r is radius of the circular base, h is height and π is constant pi.

Given that, cylindrical basket has a volume of 15 cubic feet. If the height of the basket is 1.5 feet.

First, we determine the radius r.

V = π × r² × h

r = √( v / πh )

r = √( 15 / π × 1.5 )

r = 1.784 ft

Now, we determine the area.

Area of circular base = πr²

Area of circular base = π × (1.784)²

Area of circular base = 10ft²

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The absolute minimum and maximum of n(x) on its largest possible domain are both at (x,y) = (∞,1/2).

For the first question, we need to find the critical points of f(x) on the domain [-2,0] by finding where the derivative is equal to zero or undefined:

f'(x) = 4x - 6

Setting f'(x) = 0, we get:

4x - 6 = 0
x = 3/2

Since x = 3/2 is not in the domain [-2,0], we check the endpoints of the domain:

f(-2) = 24
f(0) = 8

Therefore, the absolute minimum of f(x) on [-2,0] is at (x,y) = (-2,24), and the absolute maximum is at (x,y) = (0,8).

For the second question, we need to find the critical points of g(x) on the domain (-1,1) by finding where the derivative is equal to zero or undefined:

g'(x) = 8x - 4

Setting g'(x) = 0, we get:

8x - 4 = 0
x = 1/2

Since x = 1/2 is in the domain (-1,1), we check the value of g(x) at x = 1/2:

g(1/2) = 7

Therefore, the relative minimum of g(x) on (-1,1) is at (x,y) = (1/2,7).

For the third question, we need to find the critical points of n(x) by finding where the derivative is equal to zero or undefined:

n'(x) = -2/(2+2x)^2

Setting n'(x) = 0, we get:

-2/(2+2x)^2 = 0

This has no real solutions, so n(x) has no critical points. Therefore, we need to check the endpoints of the largest possible domain:

n(-∞) = 1/2
n(∞) = 1/2

Therefore, the absolute minimum and maximum of n(x) on its largest possible domain are both at (x,y) = (∞,1/2).

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Answer:

We can evaluate the function f(2) to find its value:

f(2) = -3(2)^2 - 2 = -12

Therefore, the point (2, -12) is on the graph of the function.

To determine which graph represents the function, we need to look for a graph that contains the point (2, -12).

Out of the provided graphs, only graph (B) contains the point (2, -12). Therefore, graph (B) represents the function f(2) = -3(2)^2 - 2.

To solve the separable differential equation dy/dt = t²y/(y + y), we first need to separate the variables by multiplying both sides by (y + y) and dt.

This gives us:
(y + y) dy = t²y dt

Next, we can integrate both sides. The integral of (y + y) dy is simply y²/2, and the integral of t²y dt requires us to use u-substitution. Let u = y, then du/dt = dy/dt. Substituting, we get:

∫ t²y dt = ∫ t²u du = (t³/3)u + C = (t³/3)y + C

Putting it all together, we have:

y²/2 = (t³/3)y + C

To solve for C, we use the initial condition y(0) = 8. Plugging this in, we get:

8²/2 = (0³/3)8 + C
32 = C

So our final formula for y in terms of t is:

y²/2 = (t³/3)y + 32

Multiplying both sides by 2/y and rearranging, we get:

y = 64/(1 - t³y)^(1/2)

This is our answer, expressed as a formula in the variable t.
To solve the given separable differential equation dy/dt = t²y/(y + y), first rewrite the equation in a separable form:

dy/dt = t²y / (2y)

Now, separate the variables by dividing both sides by y and multiplying both sides by dt:

(dy/y) = (t²/2) dt

Next, integrate both sides with respect to their respective variables:

∫(1/y) dy = ∫(t²/2) dt

The integrals of both sides are:

ln|y| = (1/3)t³ + C₁

Now, exponentiate both sides to solve for y:

y(t) = e^((1/3)t³ + C₁)

To simplify further, introduce a new constant C₂ such that:

y(t) = C₂ * e^((1/3)t³)

Now, apply the initial condition y(0) = 8:

8 = C₂ * e^((1/3) * 0³)

8 = C₂

Thus, the formula for the solution to the given differential equation is:

y(t) = 8 * e^((1/3)t³)

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The solution is, The expression is,

x + y = 14

or, y = 14-x

Here, x is the independent variable and y is the dependent variable.

Given:

The perimeter of the rectangle is 28 units.

To create:

The table shows the length and width of at least 3 different rectangles that also have a perimeter of 28 units.

Explanation:

Let x be the length of the rectangle.

Let y be the width of the rectangle.

Then the perimeter of the rectangle is,

P = 2(l+b)

so. we have,

x + y = 14

When x = 1, we get y = 13.

When x = 2, we get y = 12.

When x = 3, we get y = 11.

When x = 4, we get y = 10.

So, the table values are,

The relationship between the columns is,

When x increases by 1 unit, then y decreases by 1 unit.

The expression is,

x + y = 14

or, y = 14-x

Here, x is the independent variable and y is the dependent variable.

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The U.S. Census Bureau is responsible for collecting and analyzing a vast amount of data related to families in the United States.

This data includes information about the number of households, family size, marital status, and living arrangements. The Bureau also collects data on the number of children who live with their parents or other relatives, as well as the number of children who do not live with their parents.

In 2010, the U.S. Census Bureau reported that there were approximately 7.6 million children who did not live with their parents. Of these children, 54% were living with their grandparents or other relatives, while the remaining 46% were living with non-relatives.

The Bureau collects this data in order to better understand the needs of families and to develop policies that can help support them.

The Census Bureau also collects data on a wide range of other statistics related to families, including income, education, employment, and health. This information is used to identify trends and patterns that can help inform decisions about social programs and policies that affect families.

Overall, the U.S. Census Bureau plays a vital role in providing policymakers and researchers with the data they need to better understand and address the needs of families in the United States.

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The linear approximation to the function at the point (x, y, z) = (1, -2,0) is: L(x,y,z) = y - 4x + 4z + 4

The linear approximation to a function is essentially an approximation of the function in the vicinity of a given point using a tangent plane. This approximation is valid for small values of x, y, and z, and can be useful in many applications where precise values of the function are not necessary.

To find the linear approximation to the function at the point (x, y, z) = (1, -2,0), we need to first find the partial derivatives of the function with respect to x, y, and z. Let's assume that the function is denoted by f(x, y, z). Then, the partial derivatives can be calculated as follows:

fx(x, y, z) = 2xy - z
fy(x, y, z) = x^2 + 2z
fz(x, y, z) = -2xy

Now, we need to use these partial derivatives to find the equation of the tangent plane to the function at the point (1, -2, 0). The equation of the tangent plane can be given by:

f(x, y, z) ≈ f(1, -2, 0) + fx(1, -2, 0)(x-1) + fy(1, -2, 0)(y+2) + fz(1, -2, 0)(z-0)

Plugging in the values of the partial derivatives and the given point, we get:

f(x, y, z) ≈ -4 + (-4)(x-1) + 1(y+2) + 4(z-0)

Simplifying this equation, we get:

f(x, y, z) ≈ -4 - 4x + y + 4z + 8

f(x, y, z) ≈ y - 4x + 4z + 4

Consequently, L(x,y,z) = y - 4x + 4z + 4 is the linear approximation to the function at the point (x, y, z) = (1, -2, 0).

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