Answer:
No solution
Step-by-step explanation:
There is no such thing as a negative square root, because any number multiplied by itself cannot be a negative
I need the answer now!
How could i always get an 50% on a test with out studying 100% of the time?
no matter what topic or what grade. Is there a possible way to do this? ( 4 answer choice questions)
Step-by-step explanation:
It is not ethical or advisable to aim for a consistent 50% score on tests without putting in the effort to study and learn the material. Education is meant to help you acquire knowledge and skills that will benefit you in your personal and professional life. Consistently scoring 50% on tests without studying would not only hinder your learning but also potentially affect your future opportunities.
It is important to understand that the purpose of taking tests is to assess your understanding of the material, and if you consistently aim for a 50% score without studying, you are likely to fall behind in your classes and not reach your full potential.
It is recommended that you put in the time and effort to study and learn the material to the best of your ability. This will not only help you achieve better grades but also improve your understanding of the subject matter, which will benefit you in the long run.
the most common method for solving a risk analysis problem is to select the alternative with the
A) smallest expected value
B) greatest expected value
C) mean expected value
D) median expected value
The most common method for solving a risk analysis problem is to select the alternative with the B) greatest expected value. The expected value is the weighted average of all possible outcomes, where the weight of each outcome is its probability of occurrence.
It represents the long-term average of a random variable and is a useful tool in decision-making under uncertainty.
In risk analysis, the expected value is used to compare different alternatives and assess their potential outcomes. By selecting the alternative with the greatest expected value, decision-makers aim to maximize their chances of achieving the best possible outcome.
However, it is important to note that expected value is not the only criterion for decision-making in risk analysis. Other factors, such as the variability of outcomes, the level of risk aversion, and the potential impact of different outcomes, may also need to be considered.
Therefore, while selecting the alternative with the greatest expected value is a common method for solving risk analysis problems, it should be used in conjunction with other decision-making criteria to ensure a comprehensive and effective risk management strategy.
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If ms carpenter used 7bags to cover 2800ft squared how much wil mr larson need to cover 3900
Mr. Larson will need approximately 9.75 bags to cover an area of 3900 square feet. Since you can't have a fraction of a bag, Mr. Larson would need to round up to 10 bags to ensure full coverage.
can set up a proportion based on the relationship between the area covered and the number of bags.
If Ms. Carpenter used 7 bags to cover 2800 square feet, we can set up the following proportion:
7 bags / 2800 square feet = x bags / 3900 square feet
To solve for x, we can cross-multiply and then divide:
7 * 3900 = 2800 * x
27300 = 2800x
Dividing both sides by 2800:
27300 / 2800 = x
x ≈ 9.75
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∆ABC is inscribed in circle R whose diameter is 14 inches, and m∠B = 60°. Find AC and round to the nearest tenth.
I hope this helps you.
c<(34.56-20.56) divided by 1 6/8
The value of c<(34.56-20.56) divided by [tex]1\frac{6}{8}[/tex] is 8
First, we need to find the value inside the parentheses:
34.56 - 20.56 = 14
Next, we need to convert the mixed number [tex]1\frac{6}{8}[/tex] into an improper fraction:
[tex]1\frac{6}{8}[/tex] = (8 x 1 + 6) / 8 = 14/8
Now, we can substitute these values into the expression:
= 14 / (14/8)
To divide by a fraction, we can multiply by its reciprocal:
14 / (14/8) = 14 x (8/14)
We can simplify this by canceling out the common factor of 14:
14 x (8/14) = 8
Hence, the value of c<(34.56-20.56) divided by [tex]1\frac{6}{8}[/tex] is 8
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Ruby is designing a new board game, and is trying to figure out all the possible outcomes. How many different possible outcomes are there if she flips a coin, rolls a fair die in the shape of a cube that has six sides labeled 1 to 6, and spins a spinner with three equal-sized sections labeled Walk, Run, Stop?
There are a total of 36 possible outcomes if Ruby flips a coin, rolls a fair die, and spins a spinner with three equal-sized sections.
a plot of land is shown in the diagram. it consists of a right triangle, rectangle, and semi-circle. if the owner wants to fence in the land, how much fencing does he need?
To fence in the land shown in the diagram, the owner will need a total of x units of fencing. This can be divided into two parts: the perimeter of the right triangle and rectangle, and the circumference of the semi-circle.
1. The first part involves calculating the sum of the lengths of all sides of the right triangle and rectangle.
2. The second part requires finding the circumference of the semi-circle using the formula 2πr, where r is the radius. Adding these two parts together gives the total amount of fencing needed.
3. The land consists of a right triangle, rectangle, and semi-circle. Let's denote the sides of the right triangle as a, b, and c, with c being the hypotenuse. The rectangle has sides d and e, and the semi-circle has a radius of r.
4. To calculate the first part of the fencing, we add the lengths of all sides of the right triangle and rectangle:
Perimeter of right triangle = a + b + c
Perimeter of rectangle = 2d + 2e
5. For the second part, we need to find the circumference of the semi-circle. The formula for the circumference of a circle is 2πr, where π is a mathematical constant approximately equal to 3.14159. In this case, the radius of the semi-circle is given as r. Circumference of semi-circle = 2πr
6. Finally, we add the two parts together to obtain the total amount of fencing needed: Total fencing = Perimeter of right triangle + Perimeter of rectangle + Circumference of semi-circle
7. By calculating these values and summing them, we can determine the exact amount of fencing required to enclose the land.
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Determine whether the given functions form a fundamental solution set to an equation x'(t) = Ax. If they do, find a fundamental matrix for the system and give a general solution. let sint cost X X2 = cost X3 = sint - sint cost
To determine whether the given functions form a fundamental solution set to the equation x'(t) = Ax, we need to check if they are linearly independent and if they satisfy the equation.
First, let's check if they satisfy the equation:
x1' = [cos(t) -sin(t); sin(t) cos(t)] [cos(t); sin(t)] = [-sin(t); cos(t)]
Ax1 = [0 -1; 1 0] [cos(t); sin(t)] = [-sin(t); cos(t)]
Since x1' = Ax1, x1 satisfies the equation.
x2' = [cos(t) -sin(t); sin(t) cos(t)] [cos(2t); sin(2t)] = [-2sin(2t); 2cos(2t)]
Ax2 = [0 -1; 1 0] [cos(2t); sin(2t)] = [-sin(2t); cos(2t)]
Since x2' = Ax2, x2 satisfies the equation.
x3' = [cos(t) -sin(t); sin(t) cos(t)] [-sin(t); cos(t)] = [-sin(t); -cos(t)]
Ax3 = [0 -1; 1 0] [-sin(t); cos(t)] = [-cos(t); -sin(t)]
Since x3' = Ax3, x3 satisfies the equation.
Next, let's check if they are linearly independent. We can use the Wronskian to do this:
W(x1, x2, x3) = det([cos(t) cos(2t) -sin(t); sin(t) sin(2t) cos(t); -sin(t) cos(2t) -cos(t)])
= 2sin(t) + 2sin(2t)cos(t) - 2sin(t)cos(2t)
= 2sin(t)(1 - cos(2t) + cos(2t))
= 2sin(t)(2sin^2(t))
= 4sin^3(t)
Since the Wronskian is not zero for any t, the functions are linearly independent.
Therefore, the given functions form a fundamental solution set to x'(t) = Ax. To find a fundamental matrix, we can simply put the functions as columns:
Phi = [cos(t) cos(2t) -sin(t); sin(t) sin(2t) cos(t); -sin(t) cos(2t) -cos(t)]
The general solution is given by:
x(t) = c1*cos(t) + c2*cos(2t) - c3*sin(t) + c4*sin(2t)
where c1, c2, c3, c4 are constants determined by the initial conditions.
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what is the value of cos60 as a fraction in its simplest form
Answer:1/2
Step-by-step explanation: The unit circle or the unique right triangle can be used to represent the cosine of 60 degrees as a fraction. Using the unit circle, we can determine that the x-coordinate of the point on the unit circle that forms a 60-degree angle with the positive x-axis is equal to the cosine of that angle. The cosine of 60 degrees is 1/2 at this point, which has coordinates (1/2, sqrt (3)/2).
The unique right triangle with angles of 30, 60, and 90 degrees is an alternative. The length of the side in this triangle opposite the 60-degree angle is equal to the hypotenuse divided by two. Since the triangle is a unit triangle, the length of the opposite side is equal to the length of the hypotenuse, which is 1 sqrt(3)/2. The side that is next to the 60-degree angle and on which we are also focused in order to calculate cosine has a length of 1/2. As a result, 1/2 is also the cosine of 60 degrees.
Therefore, cos60 has a simple value of 1/2 as a fraction.
Select all of the following equation(s) that are quadratic in form. x4 – 6x2 – 27 = 0 3x4 = 2x 2(x + 5)4 + 2x2 + 5 = 0 6(2x + 4)2 = (2x + 4) + 2 6x4 = -x2 + 5 8x4 + 2x2 – 4x = 0
The quadratic equations of the given equations are 6(2x + 4)² = (2x + 4) + 2 and 8x⁴ + 2x² – 4x = 0.
Now, let's look at the given equations and determine which ones are quadratic in form.
The third equation, 6(2x + 4)² = (2x + 4) + 2, is quadratic in form because it can be simplified to the form ax² + bx + c = 0.
Specifically, we can expand the left side of the equation using the formula (a + b)² = a² + 2ab + b², which gives us 24x² + 96x + 96 = 2x + 6.
Rearranging terms, we get 24x² + 94x + 90 = 0, which is in the standard quadratic form ax² + bx + c = 0.
The fifth equation, 8x⁴ + 2x² – 4x = 0, is quadratic in form because it can be simplified to the form ax² + bx + c = 0.
Specifically, we can factor out x to get x(8x³ + 2x – 4) = 0. The expression inside the parentheses is a cubic polynomial, but we can use the quadratic formula to solve for x if we set 8x³ + 2x – 4 = 0.
Rearranging terms, we get 4x² + 1/4 = (x/2)² + 1/16, so the quadratic formula gives us x = (-1 ± √15i)/8.
In summary, out of the five given equations, only the third and fifth equations are quadratic in form.
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If John gives you 5 cookies and Kylie takes away 2 how many do you have left?
After John gives you 5 cookies and Kylie takes away 2, you are left with 3 cookies.
If John gives you 5 cookies and Kylie takes away 2, you would have 3 cookies left.
When John gives you 5 cookies, your total number of cookies is increased by 5. So, initially, you have 0 cookies and now you have 5 cookies.
However, when Kylie takes away 2 cookies, your total number of cookies is decreased by 2. So, now you have 5 - 2 = 3 cookies left.
Therefore, after John gives you 5 cookies and Kylie takes away 2, you are left with 3 cookies.
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Grades
Modules
beginning.
Question 1
The term "concentration" means amount. We will often usa % to note concentration. For example, a cell may have 80% water and 20% solute. Draw the example below on
your paper and then answer the question that follows.
1. Draw a circle to represent a cell.
2. Inside the circle, draw 7 circles and label each circle "water". Each circle represents 10% water.
3. Calculate the total concentration of water inside the cell by adding up the circles. Remember each circle = 10% water.
What is the total concentration of water inside the cell you drew?
A.70%
B.100%
C.7%
D.80%
The total concentration of water inside the cell you drew is 80%, the correct option is D.
We are given that;
Circle= 10% water
Now,
The total concentration of water inside the cell is the sum of the circles labeled “water”, which is 7 circles. Each circle represents 10% water, so 7 circles represent 70% water.
The cell also has 20% solute, which is not labeled in the drawing. The total concentration of water and solute inside the cell is 100%, so the concentration of water is 100% - 20% = 80%.
Therefore, by the percentage the answer will be 80%.
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which triangle is congruent to an isosceles triangle that has the two long sides and the bottom line is short
An isosceles triangle with two long sides and a short bottom side can have infinitely many possible congruent triangles. However, assuming that the two long sides have a fixed length of 1 unit and the length of the short bottom side is less than 1 unit, there are only two possible congruent triangles.
One of the congruent triangles would have angles of approximately 22.62°, 22.62°, and 135.76°, while the other congruent triangle would have angles of approximately 157.38°, 11.25°, and 11.25°. Therefore, the answer to this question depends on the specific length of the short bottom side and the context of the problem.
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consider the surface with parametric equations r(s,t)=⟨st,s+t,s−t⟩r(s,t)=⟨st,s+t,s−t⟩.
The surface you provided has parametric equations given by: r(s, t) = ⟨st, s + t, s - t⟩ The vector r(s, t) represents the position of a point on the surface in terms of two parameters, s and t. As s and t vary, different points on the surface are defined, creating the 3D shape of the surface.
This surface is defined by the parametric equations r(s,t)=⟨st,s+t,s−t⟩, which means that for every combination of s and t, we can get a point on the surface. The three components of the vector r(s,t) give the coordinates of that point in 3D space.
One interesting thing about this surface is that it's defined by a set of parametric equations that are themselves parametric. That is, the equations for r(s,t) include the parameters s and t, which are themselves variables that can take on any value.
Another interesting thing is that this surface is defined by a set of equations that are parametric, but not necessarily in terms of time. In other words, these equations don't necessarily describe the motion of an object through time, but rather describe the relationship between two variables (s and t) that define the surface.
In terms of its shape, the surface defined by r(s,t) has a parabolic profile that opens up in the s and t directions. This means that as s and t increase, the surface curves upward and outward, forming a bowl-like shape.
Overall, this is an example of a parametric surface that can be defined by a set of equations that are themselves parametric. While it may not have any real-world applications, it's an interesting mathematical construct that helps us understand how parametric equations can be used to describe complex shapes in 3D space.
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Find the y-intercept of the parabola
y=x^2-6x+8
Type a coordinate point like (9,-5) with no spaces.
Show your work.
Vertex is at (3,−1) ; y-intercept is at (0,8) and x-intercepts are at (2,0) and (4, 0)
We know the equation of parabola in vertex form is y = a(x - h)² + k where vertex is at (h,k). Here y = x² - 6x + 8 = (x - 3)² - 9 + 8 = (x - 3)² - 1 ∴ Vertex is at (3,-1) we find y-intercept by putting x = 0 in the equation. So y = 0 - 0 + 8 = 8 and x-intercept by putting y=0 in the equation. So x² - 6x + 8 = 0 or (x - 4)(x - 2) = 0 or x = 4; x = 2 graph{x^2-6x+8 [-20, 20, -10, 10]}
What is the radius of a sphere with a volume of 1203\text{ cm}^3,1203 cm
3
, to the nearest tenth of a centimeter?
The radius of the sphere is approximately 6.7 cm.
We have,
To find the radius of a sphere given its volume, we can use the formula:
Volume = (4/3) π radius³
Given that the volume is 1203 cm³, we can rearrange the formula to solve for the radius:
[tex]radius = (3 \times Volume / (4 \times \pi))^{1/3}[/tex]
Substituting the given volume, we have:
[tex]radius = (3 \times 1203 / (4 \times \pi))^{1/3}[/tex]
Calculating this expression, the radius is approximately 6.7 cm (rounded to the nearest tenth of a centimeter).
Thus,
The radius of the sphere is approximately 6.7 cm.
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Find The Volume
10 cm3
7 cm3
4 cm3
30 cm3
The value of volume of the figure is,
V = 20 cm³
We have to given that;
A triangular prism is shown.
Hence, We can formulate;
Volume of prism is,
V = 1/3 x b x h
Substitute all the values, we get;
V = 1/3 x 4 x 3 x 5
V = 20 cm³
Thus, The value of volume of the figure is,
V = 20 cm³
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a very long cylinder of radius a and made of material with permeability m is placed into an initially uniform magnetic field B_0=B_0 i such that the cylinder axis in is z-direction is perpendicular to B_0. Calculate the magnetic induction inside the cylinder. HINT: Assume from the beginning that potentials can be completely specified in terms of cos(φ) cylindrical harmonics AND only inside fields are needed.
The magnetic induction inside the cylinder is given by B(r,theta,z) = (mu_0/2)(B_0 + (2/pi)*(M/a)*cos(theta)), where M is the magnetic moment per unit length of the cylinder and mu_0 is the permeability of free space.
To find the magnetic induction inside the cylinder, we can use the boundary conditions for magnetic fields at the interface between two materials with different permeabilities.
First, we assume that the magnetic potential can be written as a sum of cylindrical harmonics of the form:
A_z(r, θ, z) = ∑ C_n cos(nθ) e^(-jβn z)
where βn is the propagation constant for the nth harmonic, and Cn are constants to be determined by boundary conditions.
Since the cylinder is infinitely long and symmetric around the z-axis, we can assume that the magnetic field has only a z-component and is given by:
B_z = (1/mu) ∂(A_z)/∂z
where mu is the permeability of the cylinder.
We can apply the boundary conditions at the interface between the cylinder and the surrounding air (which has permeability mu_0):
The tangential component of the magnetic field must be continuous across the interface:
B_z(cylinder surface) = B_z(air)
The normal component of the magnetic flux density must be continuous across the interface:
muB_z(cylinder surface) = mu_0B_0
where B_0 is the magnitude of the initial magnetic field.
Using the expressions for A_z and B_z, we can write:
B_z(cylinder surface) = (1/mu) ∂(A_z)/∂z (at r=a)
B_z(air) = B_0 (at r=a)
We can evaluate the partial derivative of A_z with respect to z using the formula for cylindrical harmonics:
∂(A_z)/∂z = -j∑ βn C_n cos(nθ) e^(-jβn z)
Plugging this into the boundary condition and using the fact that cos(nθ) is an even function for integer n, we get:
(1/mu) ∑ βn C_n cos(nθ) e^(-jβn a) = B_0 (at r=a)
Multiplying both sides by cos(mθ) and integrating over the range 0 to 2π, we get:
(1/mu) ∑ βn C_n J_m(βn a) = π B_0 δ_m0
where J_m is the Bessel function of the first kind of order m, and δ_m0 is the Kronecker delta.
Solving for C_n, we get:
C_n = (π B_0/mu) J_n(βn a)/βn δ_n0
Finally, we can express the magnetic induction inside the cylinder as:
B_z(r, θ, z) = (B_0/mu) ∑ (J_n(βn a)/βn) cos(nθ) e^(-jβn z)
where the sum is taken over all integer values of n, and βn is determined by the equation:
(1/mu) J_n(βn a) = βn J_n-1(βn a)
This equation can be solved numerically to find the values of βn for each harmonic. The magnetic induction inside the cylinder will then be given by the above equation, with the appropriate values of n and βn.
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(GEO) A quadrilateral is inscribed in a circle. What is the value of x? *number
Answer:
19°
Concept used:
Property of Cyclic Quadrilaterals (Quadrilateral inscribed in a circle)
(Sum of opposite angles is 180 deg)
Step-by-step explanation:
[tex]= > 123 + 3x = 180\\\\= > x = \frac{57}{3}\\\\= > x = 19^{o}[/tex]
2. Factor.
8x² +10x-8.
Answer:
Step-by-step explanation:
I don’t no
Calculate the value of x
Answer:
13
Step-by-step explanation:
I hope it's visible enough. F is for frequency and I replaced the other one by x.
you enclose code that may contain an exception in a ____ statement.
In programming, an "enclose" statement refers to placing a block of code within a specific construct, such as a loop or function, to control its execution and ensure proper behavior.
When writing code, it's common to encounter exceptions, which are unexpected errors or events that can cause the program to crash or behave in unexpected ways. To handle exceptions, programmers use a construct called a "try-catch" statement, which encloses the code that may throw an exception within a "try" block. If an exception is thrown, the "catch" block will execute, allowing the programmer to handle the exception and take appropriate action.
Using a try-catch statement is essential for writing robust and reliable code, as it ensures that unexpected errors are caught and handled gracefully. By enclosing code that may contain an exception within a try block, programmers can prevent their program from crashing or malfunctioning in the event of an unexpected error. Additionally, by handling exceptions appropriately, programmers can provide a better user experience and prevent their users from encountering cryptic error messages or unexpected behavior. Overall, the try-catch statement is a fundamental tool for any programmer, and mastering its use is crucial for writing high-quality code.
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What is the ratio of rise to run between the points (-2, 8) and (4, -3)?
A: 11/6
B: -11/6
C: 6/11
D: -6/11
The ratio of rise to run is -11/6.
In mathematics, a ratio shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six
To find the ratio of rise to run between two points, we calculate the difference in the y-coordinates (rise) divided by the difference in the x-coordinates (run).
Given the points (-2, 8) and (4, -3), the rise is -3 - 8 = -11 and the run is 4 - (-2) = 6.
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(2)x+ (3)c = 24
point slide form
Answer: x= 24-3c over 2 (\frac{24-3c}{2})
Step-by-step explanation:
Use the solution method from this example to find a basis for the given subspace. S = span {[1 -1 0 2], [3 -5 4 8], [0 1 -2 -1]} Give the dimension of the basis. v
Answer:
Step-by-step explanation:
The dimension of the basis is {[1 0 0 2], [-1 1 0 0]}.
To find a basis for the subspace S = span {[1 -1 0 2], [3 -5 4 8], [0 1 -2 -1]}, we can use the same method as in the example. First, we put the vectors in a matrix and row-reduce it:
[1 -1 0 2]
[3 -5 4 8]
[0 1 -2 -1]
R2 - 3R1 -> R2
R3 -> R3 + 2R1
[1 -1 0 2]
[0 -2 4 2]
[0 1 -2 -1]
-1/2R2 -> R2
[1 -1 0 2]
[0 1 -2 -1]
[0 1 -2 -1]
R3 - R2 -> R3
[1 -1 0 2]
[0 1 -2 -1]
[0 0 0 0]
We can see that the last row is all zeros, so we have only two pivots and one free variable. This means that the dimension of the subspace S is 2. To find a basis, we can write the pivots as linear combinations of the original vectors:
[1 -1 0 2] = [1 0 0 2] + [-1 1 0 0]
[0 1 -2 -1] = [0 1 -2 -1]
Therefore, a basis for S is {[1 0 0 2], [-1 1 0 0]}.
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Someone who knows how to do this correctly, please write an expression for its perimeter. Thanks and will mark BRAINLIEST whoever answers correctly.
Step-by-step explanation:
perimeter = 2y + 2y + 3 + 3x + 2y + 3 + 2y + 4x + 5
= 8y + 7x + 11
Step-by-step explanation:
2y+3+2y+4x+5+3x
=2y+2y+3x+4x+3+5
=4y+7x+8
f the concentrations of a weak acid and its conjugate base are decreased from 0.5 m and 0.2 m, respectively, to 0.3 m and 0.04 m, the solution's buffer capacity will _________. increase
decrease
remain constant
decrease then increase
Therefore, when their concentrations decrease from 0.5 m and 0.2 m to 0.3 m and 0.04 m, respectively, the buffer capacity decreases as well.
The solution's buffer capacity will decrease with the decrease in concentrations of the weak acid and its conjugate base. Buffer capacity is the ability of a buffer solution to resist changes in pH when small amounts of acid or base are added. A higher concentration of the weak acid and its conjugate base leads to a higher buffer capacity. Therefore, when their concentrations decrease, the buffer capacity decreases as well. When the concentrations of a weak acid and its conjugate base decrease, the solution's buffer capacity decreases. Buffer capacity is the ability of a buffer solution to resist changes in pH when small amounts of acid or base are added. A higher concentration of the weak acid and its conjugate base leads to a higher buffer capacity.
Therefore, when their concentrations decrease from 0.5 m and 0.2 m to 0.3 m and 0.04 m, respectively, the buffer capacity decreases as well.
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What is the slope of the line y=-2x+3?
A. -3
OB. 2
C. -2
D. 3
now assume that a person is tested twice and that the results of the tests are independent from each other. if the person tests positive twice, now what is the probability that this person has the disease?
Assuming that a person is tested twice and that the results of the tests are independent from each other, the probability that the person has the disease after testing positive twice can be found using Bayes' theorem.
Bayes' theorem provides a way to update the probability of an event based on new evidence. In this case, the probability of having the disease given two positive test results can be calculated using the probability of testing positive given the disease and the probability of having the disease before the test.
The formula for Bayes' theorem is as follows: P(A|B) = P(B|A) * P(A) / P(B), where P(A|B) is the probability of event A given that event B has occurred, P(B|A) is the probability of event B given that event A has occurred, P(A) is the prior probability of event A, and P(B) is the marginal probability of event B. In this case, let event A be having the disease and event B be testing positive twice.
The probability of testing positive given the disease is the sensitivity of the test, and the prior probability of having the disease is the prevalence in the population. The marginal probability of testing positive twice can be found by multiplying the probability of testing positive once by itself.
To summarize, the probability that a person has the disease after testing positive twice can be calculated using Bayes' theorem. The probability of testing positive given the disease is the sensitivity of the test, and the prior probability of having the disease is the prevalence in the population. The marginal probability of testing positive twice can be found by multiplying the probability of testing positive once by itself.
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