The lengths of the semimajor and semi-minor axes of an ellipse (or an ellipsoid in higher dimensions) are related to the singular values of the transformation matrix.
Hence, we can write the relationship between a, b, and det(A) as:
a^2 = λ1 = det(A) λ2^(-d+2)/2
b^2 = λ2 = det(A) λ1^(-1) λ3^(-d+2)/2^(d-2)
or equivalently,
a^2 b^2 = det(A)^2 / 2^(d-2).
The lengths of the semimajor and semi-minor axes of an ellipse (or an ellipsoid in higher dimensions) are related to the singular values of the transformation matrix. Specifically, if T is an invertible linear transformation with matrix A, then the lengths of the semi-axes of T(Ω) are given by the square roots of the eigenvalues of the matrix A^T A. Let λ1, λ2, λ3 be the eigenvalues of A^T A (or A^T A^T in 2D), arranged in decreasing order. Then the lengths of the semi-axes of T(Ω) are given by:
a = √(λ1)
b = √(λ2) (in 2D) or b = √(λ3) (in 3D)
Moreover, the determinant of A is equal to the product of the singular values of A, which are the square roots of the eigenvalues of A^T A. Therefore, we have:
det(A) = λ1 λ2 λ3^(d-2)/2
where d is the dimension of the space (2 or 3 in the case of an ellipse in 2D or an ellipsoid in 3D, respectively).
Hence, we can write the relationship between a, b, and det(A) as:
a^2 = λ1 = det(A) λ2^(-d+2)/2
b^2 = λ2 = det(A) λ1^(-1) λ3^(-d+2)/2^(d-2)
or equivalently,
a^2 b^2 = det(A)^2 / 2^(d-2)
This relationship shows that the product of the semi-axes of T(Ω) is related to the determinant of A, but the individual semi-axes depend also on the singular values of A, which are related to the eigenvalues of A^T A.
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Use logarithmic differentiation to find the derivative of y= ( X^2 +1)^3 (x – 1)^6 x^2.
Using logarithmic differentiation to the derivative of y is dy/dx = ( X^2 +1)^3 (x – 1)^6 x^2 [3(2x)/(x^2 + 1) + 6/(x - 1) + 2/x]
Logarithmic differentiation is a technique used to find the derivative of a function by taking the natural logarithm of both sides. By applying this method to the given expression, we obtain the derivative dy/dx.
After expanding and simplifying the expression, the derivative is expressed as a product of the original function and a combination of terms involving x.
This approach allows us to differentiate complicated functions by taking advantage of the properties of logarithms. The final expression represents the derivative of the given function with respect to x.
Taking the natural logarithm of both sides, we get:
ln y = 3 ln (x^2 + 1) + 6 ln (x - 1) + 2 ln x
Now, differentiating both sides with respect to x:
1/y (dy/dx) = 3(2x)/(x^2 + 1) + 6/(x - 1) + 2/x
Multiplying both sides by y:
dy/dx = y [3(2x)/(x^2 + 1) + 6/(x - 1) + 2/x]
Substituting the expression for y:
dy/dx = ( X^2 +1)^3 (x – 1)^6 x^2 [3(2x)/(x^2 + 1) + 6/(x - 1) + 2/x]
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Point B has coordinates (1,2). The x-coordinate of point A is a -5. The distance between point A and B is 10 units. What are the possible coordinates of point A?
Answer:
There are two possible coordinates for A: Either A (-5, 10) or A (-5, -6)
Step-by-step explanation:
To find the possible coordinates of A, we will need to find the possible y-coordinate.
We can do this using the distance (d) formula, which is
[tex]d=\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }[/tex], where (x1, x2) are one set of coordinates and (y1, y2) are the other set of coordinates
We can allow point B (1, 2) to be our x1 and x2 coordinates and A (-5, y2) to be our x2 and y2. Thus, we must plug into the formula 10 for d and solve for y2:
[tex]10=\sqrt{(-5-1)^2+(y_{2}-2)^2}\\ 10=\sqrt{(-6)^2+(y_{2}-2)^2}\\ 10=\sqrt{36+(y_{2}-2)^2}\\ 100=36+(y_{2}-2)^2\\64=(y_{2}-2)^2\\[/tex]
To finish solving, we must take the square root of both sides. Whenever you take a square root, there is both a positive answer and a negative answer, since squaring a negative number also yields a positive number (e.g., 5 * 5 = 25 and -5 * -5 = 25):
Positive answer:
[tex]8=y_{2}-2\\10=y_{2}[/tex]
Negative answer:
[tex]-8=y_{2}-2\\-6=y_{2}[/tex]
To check our answers, we can plug in both 10 for y2 into the formula and -6 for y2 into the formula and check that we get 10 each time:
Plugging in 10 for y2:
[tex]10=\sqrt{(-5-1)^2+(10-2)^2}\\ 10=\sqrt{(-6)^2+(8)^2}\\ 10=\sqrt{36+64}\\ 10=\sqrt{100}\\ 10=10[/tex]
Plugging in -6 for y2:
[tex]10=\sqrt{(-5-1)^2+(-6-2)^2}\\ 10=\sqrt{(-6)^2+(-8)^2}\\ 10=\sqrt{36+64}\\ 10=\sqrt{100}\\ 10=10[/tex]
Thus, the two possible coordinates of A are (-5, 10), where 10 is the y-coordinate or (-5, -6), where - 6 is the y-coordinate.
Each day, John’s mother gives him money before he goes to school: 50% of the time he gets $5, 35% of the time he gets $10, and the rest of the time he gets $20. if he realizes he has to spend an average of $4 a day with a standard deviation of $0.75, what is the approximate probability that he saves less than $400? assume independence
The approximate probability that John saves less than $400 is 0.166 or 16.6%.
First, we need to determine the mean and standard deviation of the amount of money John receives each day:
Mean = (0.50 * $5) + (0.35 * $10) + (0.15 * $20) = $6.25
Standard deviation = sqrt[(0.50 * ($5 - $6.25)^2) + (0.35 * ($10 - $6.25)^2) + (0.15 * ($20 - $6.25)^2)] = $5.54
Next, we need to calculate the mean and standard deviation of the amount of money John saves each day:
Mean savings = $6.25 - $4 = $2.25
Standard deviation of savings = $0.75
To calculate the total amount of money John saves over a certain period of time, we need to use the following formula:
Total savings = (Number of days) * (Mean savings)
We can estimate the probability distribution of John's total savings using the Central Limit Theorem, which states that the sum of a large number of independent, identically distributed random variables approaches a normal distribution.
Since we don't know the exact number of days, we can assume it is large enough for the Central Limit Theorem to apply.
Using the formula for the z-score, we can calculate the z-score for a total savings of $400:
z = (400 - (Number of days) * (Mean savings)) / (Standard deviation of savings * sqrt(Number of days))
To simplify this calculation, we can use a continuity correction and assume that John saves between $399.50 and $400.50:
z = (399.5 - (Number of days) * (Mean savings)) / (Standard deviation of savings * sqrt(Number of days))
z = (400.5 - (Number of days) * (Mean savings)) / (Standard deviation of savings * sqrt(Number of days))
We can use a standard normal distribution table or calculator to find the probability that z is less than or equal to the calculated z-score.
The resulting probability is approximately 0.166 or 16.6%, which is the approximate probability that John saves less than $400 over the given period of time.
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Please Help me with number 2!
Answer:
The parameters of the linear model found in the linear regression are the slope, m, and the y-intercept, b.
How many numbers did Bill write? Bill wrote all the natural numbers between 9 and v (where v is greater than 9)
The number of numbers that Bill wrote (v-8) numbers.
How to form inequalities?
A mathematical phrase that states the order relationship between two integers or algebraic expressions as greater than, greater than or equal to, less than, or less than or equal to.
If Bill wrote all the natural numbers between 9 and v, then the number of numbers he wrote would be equal to the difference between v and 9 plus one (since he included both 9 and v).
v > 9
(where v is greater than 9 i.e., (v-9)+1. )
=(v-9) + 1
= v - 9 + 1
= v - 8
Therefore, the number of numbers he wrote would be (v - 8) numbers.
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Subjects for the next presidential election poll are contacted using telephone numbers in which the last four digits are randomly selected (with replacement). Find the probability that for one such phone number, the last four digits include at least one 0.
The probability is__(Round to three decimal places as needed.)
The probability that for one such phone number is approximately 0.344
How to calculate the probability?There are 10 possible digits (0-9) for each of the last four digits of the telephone number. Therefore, there are [tex]10^4[/tex]= 10,000 possible telephone numbers that can be generated using this method.
The probability that the last four digits do not include any 0s is:
P(no 0s) = [tex](9/10)^4[/tex] = 0.6561
So, the probability that the last four digits include at least one 0 is:
P(at least one 0) = 1 - P(no 0s) = 1 - 0.6561 = 0.3439
Therefore, the probability that for one such phone number, the last four digits include at least one 0 is approximately 0.344 (rounded to three decimal places).
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Which expression is equivalent to 8+w+5w?
Answer:
2(3w+4)
Step-by-step explanation:
Given:
(W) is a variable with an unknown number
you are multiplying 5 by (w) variable
you are adding the 8 to (w) and 5w
1. Combine like terms:
8+w+5w
8+6w
2. Rearrange terms:
8+6w
6w+8
3. Common factor:
6w+8
2(3w+4)
Determine whether the following equation is separable. If so, solve the given initial value problem. 3y'(x) = ycos3xSelect the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The equation is separable. The solution to the initial value problem is y(t) = (Type an exact answer in terms of e.) O B. The equation is not separable.
The equation is separable, and the solution to the initial value problem is y(x) = Ce^(1/3sin(3x)), where C = ±e^(C1).
How to identify whether the equation is separable?A differential equation of the form 3y'(x) = ycos(3x) is separable because we can write it as:
dy/dx = (1/3)ycos(3x)
We can separate the variables y and x and integrate both sides of the equation with respect to their respective variables:
∫(1/y)dy = ∫(1/3)cos(3x)dx
ln|y| = (1/3)sin(3x) + C1
where C1 is the constant of integration.
Solving for y, we get:
y(x) = Ce^(1/3sin(3x))
where C = ±e^(C1) is the constant of integration.
Therefore, the equation is separable, and the solution to the initial value problem is y(x) = Ce^(1/3sin(3x)), where C = ±e^(C1).
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Find the inverse by Gauss-Jordan (or by (4*) if n=2). Check by using (1).[\begin{array}{ccc}1&0&0\\0&0&1\\0&1&0\end{array}\right]
The result is the identity matrix, confirming that our inverse is correct.
How to find the inverse of the given matrix using Gauss-Jordan elimination?We'll perform row operations until we reach the identity matrix. The given matrix is:
[1 0 0]
[0 0 1]
[0 1 0]
Step 1: Swap row 2 and row 3 to get the identity matrix on the left:
[1 0 0]
[0 1 0]
[0 0 1]
Now we have reached the identity matrix. Since we performed one row swap, the inverse matrix will be the same as the initial matrix:
Inverse matrix:
[1 0 0]
[0 0 1]
[0 1 0]
To check the result using (1), we'll multiply the original matrix and its inverse:
Original matrix * Inverse matrix:
[1 0 0] [1 0 0]
[0 0 1] × [0 0 1]
[0 1 0] [0 1 0]
Performing the matrix multiplication:
[1×1+0×0+0×0 1×0+0×0+0×1 1×0+0×1+0×0] [1 0 0]
[0×1+0×0+1×0 0×0+0×0+1×1 0×0+0×1+1×0] = [0 0 1]
[0×1+1×0+0×0 0×0+1×0+0×1 0×0+1×1+0×0] [0 1 0]
The result is the identity matrix, confirming that our inverse is correct.
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Rectangle X is enlarged to give rectangle Y. Both shape are shown below but some rectangle Y is missing
What is the title width of rectangle Y
The width of rectangle Y is 8 units.
How to find the width of rectangle Y?The width of rectangle Y is obtained applying the proportions in the context of the problem.
The dimensions of rectangle X are given as follows:
Height of 3 units.
Width of 2 units.
The dimensions of rectangle Y are given as follows:
Height of 12 units.
Width of x units.
The height was enlarged by a scale factor of 4, hence the width is given as follows:
2 * 4 = 8 units.
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Complete Question
Check attached image
please guys help here
Answer:
see explanation
Step-by-step explanation:
(a)
x² - 11x + 24
consider the factors of the constant term (+ 24) which sum to give the coefficient of the x- term (- 11)
the factors are - 3 and - 8 , since
- 3 × - 8 = + 24 and - 3 - 8 = - 11, then
x² - 11x + 24 = (x - 3)(x - 8) ← in factored form
(b)
([tex]x^{4}[/tex] - 8x²y² + 16[tex]y^{4}[/tex] ) - 289 ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b)
= (x² - 4y² )² - 17²
= (x² - 4y² - 17)(x² - 4y² + 17) ← in factored form
The Great Pyramid of Cheops is a square-based pyramid. The base has sides of 230 m, and the height is 147 m. Using the same material, what would the height be if you gave the base sides of 200 m?
We can use the fact that the ratio of the height to the base length for a square-based pyramid is constant to solve this problem.Therefore if the base sides of the Great Pyramid of Cheops were 200m instead of 230m, the height would be approximately 127.4m
What is ratio?A ratio is a mathematical expression that compares two quantities or numbers by division. Ratios can be expressed in different ways, but they are usually written as a fraction, using a colon, or as a decimal. For example, if there are 4 boys and 6 girls in a class, the ratio of boys to girls is 4:6 or simplified to 2:3. This means there are 2 boys for every 3 girls
What is pyramid?a pyramid is a three-dimensional geometric shape with a polygonal base and triangular faces that meet at a common vertex. Its volume can be calculated as (1/3) x base area x height.
According to the given information :
We can use the fact that the ratio of the height to the base length for a square-based pyramid is constant to solve this problem.
Let h1 be the height of the pyramid with base length 230m, and h2 be the height of the pyramid with base length 200m. Then we have:
h1 / 230 = h2 / 200 (since the material used is the same)
We can cross-multiply to solve for h2:
h2 = h1 x 200 / 230
Substituting h1 = 147m, we get:
h2 = 147 x 200 / 230
h2 ≈ 127.4m
Therefore, if the base sides of the Great Pyramid of Cheops were 200m instead of 230m, the height would be approximately 127.4m
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Can anyone help me on this? I’m pretty sue wits base x height
Answer:
It's 84
Step-by-step explanation:
To calculate the area of a triangule you need to use this formula:
B * H / 2
So:
12 * 14 / 2 = 84
Hope this helps :)
Pls brainliest...
Hello! Please help me solve this problem.
Make sure to show your work so I know your answer is correct and I could also give you points for it!
Answer:
96/120 = 4/5
4/5 × 425 = 340 students
Bookwork code: L64 Calculator allowed a) What is the circumference of the shaded face? b) What is the width, w, of the rectangle? Give each answer to 1 d.p. 5 mm (0 W O Not drawn accurately
The circumference of the shaded face is 62.8 mm while the width of the rectangle is 62.8 mm
How to solve an equation?An equation is an expression that can be used to show the relationship between two or more numbers and variables using mathematical operators.
The area of a figure is the amount of space it occupies in its two dimensional state.
The radius (r) of the circle is 10mm. Hence:
Circumference = 2π * radius = 2π * 10 = 62.8 mm
The width of the rectangle = Circumference of circle = 62.8 mm
The circumference of the shaded face is 62.8 mm
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Find «B, «E, «C, and «D, given m
*Picture not drawn to scale*
Your given angles fall on a straight line. What would be the other angle if we know a straight line has a total of measurement of 180 degrees?
You can use that information to find the missing angle for inside the triangle. Remember how many degrees total are inside a triangle.
Based on the definition of the the angles on a straight line, we have:
m<B = 40°; m<E = 50°; m<C = 90; m<D = 90°.
What are Angles on a Straight Line?When two straight lines intersect, they form four angles. Angles that are formed on a straight line are called "angles on a straight line" or "linear pairs." These angles are also known as supplementary angles because they add up to 180 degrees. Therefore, if two angles are formed on a straight line, the measure of one angle added to the measure of the other angle equals 180 degrees.
m<B = 180 - 140 = 40° [straight angle]
m<E = 180 - 130 = 50°
m<C = 180 - m<B - m<E [triangle sum theorem]
Substitute:
m<C = 180 - 40 - 50
m<C = 90
m<D = 180 - m<C
m<D = 180 - 90 = 90°
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Question 6(Multiple Choice Worth 2 points)
(Creating Graphical Representations LC)
A teacher was interested in the subject that students preferred in a particular school. He gathered data from a random sample of 100 students in the school and wanted to create an appropriate graphical representation for the data.
Which graphical representation would be best for his data?
Stem-and-leaf plot
Histogram
Circle graph
Box plot
The graphical representation which would be best for his data as required to be determined is; Histogram.
Which answer choice represents the data to be recorded?It follows from the task content that the answer choice which represents the best graphical representation for the data be determined.
The histogram is a graphing tool most often used to summarize discrete or continuous data that are measured on an interval scale. In most cases, A histogram is used graph to show frequency distributions.
Hence, in the given scenario; the teach was interested in the subject that students preferred, the graphical representation which would be best would be; a Histogram.
Ultimately, the best graphical representation of the data would be by the use of an histogram.
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use your own words to explain what a sequence is. Give an example to illustrate this explanation 
A sequence is a collection of numbers in which a pattern between consecutive numbers is established.
One example is a geometric sequence with first term of 2 and common ratio of 3, which is:
2, 6, 18, 54, ...
What is a geometric sequence?A geometric sequence is a sequence of numbers where each term is obtained by multiplying the previous term by a fixed number called the common ratio q.
Considering a geometric sequence with first term of 2 and common ratio of 3, the other terms are given as follows:
2 x 3 = 6.6 x 3 = 18.18 x 3 = 54.And the pattern continues for however many terms are there in the sequence.
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transversal problems pls hlp
The solution to the transversal problem is determined using the alternate exterior angles theorem, therefore, x = 15.
How to Solve Transversal Problems?The diagram shows two given alternate exterior angles, to solve this transversal problem, apply the alternate exterior angles theorem, which states that alternate exterior angles are congruent.
Thus, we have:
6x + 8 = 7x - 7
Combine like terms:
6x - 7x = -8 - 7
-x = -15
x = 15
The value of x is: 15.
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Find the proportion of observations from a standard normal distribution that satisfies each of the following statements. Give your answers to four decimal places.
A. z<−0.65.
B. z>−0.65.
C. z<1.32.
D. −0.65
A. z < -0.65. 25.78% of observations are less than -0.65. B. z > -0.65. 74.22% of observations are greater than -0.65. C. z < 1.32. 90.66% of observations are less than 1.32. D. For z = -0.65, It represents the proportion of observations that have a z-score of less than -0.65.
A. To find the proportion of observations from a standard normal distribution that satisfies the statement z < -0.65, we can use a standard normal table or calculator to find the area under the curve to the left of -0.65. This area is equal to approximately 0.2578, or 0.2579 when rounded to four decimal places.
B. To find the proportion of observations that satisfy the statement z > -0.65, we can find the area under the curve to the right of -0.65. This is equal to 1 - P(z < -0.65), or 1 - 0.2578, which equals approximately 0.7422, or 0.7421 when rounded to four decimal places.
C. To find the proportion of observations that satisfy the statement z < 1.32, we can find the area under the curve to the left of 1.32. This is equal to approximately 0.9066, or 0.9065 when rounded to four decimal places.
D. The statement "-0.65" is not actually a statement, so there is no proportion of observations to calculate. If this was meant to be a typo and the statement was meant to be "z = -0.65", then the proportion of observations that satisfy this statement would be extremely small, as the probability of getting a single specific value from a continuous distribution is zero.
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Hannah's Diner sold 825 milkshakes last week. 264 of the milkshakes had whipped cream on top. What percentage of the milkshakes had whipped cream?
The percentage of the milkshakes sold that had whipped cream on top is 32.12%.
What percentage of the milkshakes had whipped cream?Percentage is simply a number or ratio expressed as a fraction of 100.
Given that:
Number of milkshakes sold by Hannah's Diner = 825
Number of milkshakes that had whipped cream on top = 264
To find the percentage of milkshakes that had whipped cream, we need to divide the number of milkshakes with whipped cream by the total number of milkshakes sold, and then multiply by 100 to express it as a percentage.
Hence,the percentage of milkshakes with whipped cream is:
= (264/825) × 100%
= 32.12%
Therefore, 32% of the milkshakes sold had whipped cream on top.
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Find the height of the tree in feet
The height of the tree in feet is 62 .
What is the height of the tree?Two triangles are similar if their corresponding angles are congruent and corresponding sides are proportional.
From the diagram:
Leg 1 of the smaller triangle = 5ft 2in = ( 5×12 + 12 )in = 62 in
Leg 2 of the smaller triangle = 10ft ( 10 × 12 ) = 120in
Leg 1 of the larger triangle = x
Leg 2 of the larger triangle = 120 ft = ( 120 × 12 )in = 1440 in
Since the corresponding sides of similar triangles are proportional.
We take equate their ratios
62/120 = x/1440
Solve for x
120x = 62 × 1440
120x = 89280
x = 89280/120
x = 744in
Convert back to feet
x = ( 744 ÷ 12 ) ft
x = 62 ft
Therefore, the value of x is 62 feets.
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A savings account balance is compounded. annually. If the interest rate is 2% per year and the current balance is $1,427.00, what will the balance be 7 years from now?
Answer:
$1,639.17
Step-by-step explanation:
1,427(1+0.02)^7
Where 1,427 is the original balance, and 0.02 is the interest rate, and the exponent is the number of years interest is compounded
= 1,639.1744477
Without solving for the undermined coefficients, the correct form of a particular solution differential equation y′′+4y′+5y=e2xcos(x) is ?
The correct form of a particular solution to the given differential equation, without solving for the undetermined coefficients, is a linear combination of terms that include cos²ˣ(x) and e²ˣsin(x).
To find the correct form of a particular solution without solving for the undetermined coefficients, we can make an educated guess based on the form of the right-hand side of the equation, which is e²ˣcos(x). Since e²ˣ is a solution to the homogeneous equation (i.e., the equation without the right-hand side), we can guess a particular solution in the form of (Ax + B)e²ˣcos(x), where A and B are undetermined coefficients that we need to determine.
Now, we need to account for the fact that the right-hand side also includes cos(x). The derivative of cos(x) is -sin(x), so we need to include a term that cancels out the -sin(x) term that will arise when we take the second derivative of (Ax + B)e²ˣcos(x). To do that, we can add another term in the form of (Cx + D)e²ˣsin(x), where C and D are also undetermined coefficients.
So, the particular solution in the correct form is:
y_p(x) = (Ax + B)e²ˣcos(x) + (Cx + D)e²ˣsin(x)
Therefore, the correct form of a particular solution to the given differential equation is a linear combination of terms that include e²ˣcos(x) and e²ˣsin(x).
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-7x - 2 ≥ -3(x -6) need help
find the indicated complement. find p( a), given that p(a) = 0.956.
The complement of A has a probability of 0.044.
What is complement of an event?The occurrence that A does not occur is the complement of event A. A', often known as "not A," is used to indicate it. One less than the probability of A gives you the probability of A'.
P(A') = 1 - P(A)
In probability and statistics, the concept of the complement of an event is helpful because it enables us to calculate the probability of an event by calculating the probability of its complement and deducting it from 1. The probability of the complement may also, in some circumstances, be more easily determined than the probability of the initial occurrence.
To find the complement we subtract the probability with 1 as follows:
P(A') = 1 - P(A)
Thus,
P(A') = 1 - P(A) = 1 - 0.956 = 0.044
Hence, the complement of A has a probability of 0.044.
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There are 12 DVDs, 7 video games, 14 CDs, and 3 videotapes on Jamie’s bedroom shelf. If Jamie selects an item at random from the shelf, what is the probability that it is a DVD or video tape?
Answer:
41.6666%
Step-by-step explanation:
In the Salk vaccine trial of 1954, almost 400,000 students (grades 1-3) in 11 states participated. Students were randomly assigned to either a vaccine or placebo injection. All students were observed for evidence of polio during the school year. What is the factor in the Salk vaccine experiment? (a) type of injection (b) vaccine (c) placebo (d) polio status
The factor in the Salk vaccine experiment is the type of injection, which is the independent variable that was manipulated in the experiment to determine its effect on the dependent variable, which is the presence or absence of polio.
The factor in the Salk vaccine experiment is the type of injection, which is either the vaccine or the placebo. This is the independent variable, which is the factor that is being manipulated in the experiment to determine its effect on the dependent variable, which is the presence or absence of polio.
The students were randomly assigned to either the vaccine or placebo injection group, which is an important aspect of the experiment to control for any potential confounding variables. This randomization helps to ensure that any observed differences between the vaccine and placebo groups are due to the type of injection received and not due to any other factors, such as differences in age, gender, or health status.
During the school year, all students were observed for evidence of polio, which is the dependent variable. The purpose of the experiment was to determine whether the vaccine was effective in preventing polio, so the presence or absence of polio is the outcome measure that was used to evaluate the effectiveness of the vaccine.
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What is the radius of a circle whose equation is (x + 5)^2 + (y – 3)^2 = 4^2? What are the coordinates of the center of the circle?
[tex]\textit{equation of a circle}\\\\ (x- h)^2+(y- k)^2= r^2 \hspace{5em}\stackrel{center}{(\underset{}{h}~~,~~\underset{}{k})}\qquad \stackrel{radius}{\underset{}{r}} \\\\[-0.35em] ~\dotfill\\\\ (x+5)^2+(y-3)^2=4^2\implies ( ~~ x-(\stackrel{ h }{-5}) ~~ )^2+(y-\stackrel{ k }{3})^2=\stackrel{ r }{4^2}\qquad \begin{cases} \stackrel{ center }{(-5,3)}\\ \stackrel{radius}{4} \end{cases}[/tex]
12. You drive your car for 2 hours while traveling at a speed of 40 mi/hr. How many miles do you
travel?
Answer: you travel 80 miles in 2 hours while driving at a speed of 40 miles per hour.
Answer: 80 mi/hr
Step-by-step explanation: If you are traveling at a speed of 40 mi/hr for 2 hours, you need to do 40x2 which is equal to 80.