Correlations are used both as a hypothesis test to check the relationship between two variables, and also as internal reliability check, again to check the relationship between two items is true.
To evaluate a hypothesis about a population, hypothesis testing uses sample data. A hypothesis test evaluates the result's unusualness, determining if there is a reasonable amount of random variation or whether the result is too extreme to be accounted for by chance.
Reliability can be measured by internal consistency. When a measurement is said to be reliable, it means that it will always produce the same result, given all other factors being equal.
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An isosceles triangle has two sides of equal
length. The third side is 5 less than twice the
length of one of the other sides. If the
perimeter of
the triangle is 23 cm, what is the length of the third
side?
Explain how you would define a variable for this
problem.
The required length of of the third side of isosceles triangle is 9 units.
Explain about isosceles triangle.An Isosceles triangle is a triangle that has two equal sides. Also, the two angles opposite the two equal sides are equal. In other words, we can say that “An isosceles triangle is a triangle which has two congruent sides“.
According to question:Let the length of Equal two sides is x.
Third side = 2x - 5
Then, perimeter is 23 cm
x + x + 2x - 5 = 23
4x - 5 = 23
4x = 28
x = 7
Then, third side is 2x - 5
= 2(7) - 5
= 14 - 5
= 9 units
Thus, required length of third side is 9 units.
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100 points Factor completely and then place the factors in the proper location on the grid. 5 y2 - 2 y - 3
Answer:
is try ur hardest
Step-by-step explanation:
Seorang mengendarai mobil dengan kecepatan 72 km/jam, tiba-tiba melihat seorang anak kecil di tengah jalan pada jarak 50 m dimukanya. Jika mobil direm dengan perlambatan maksimum sebesar 4 m/s2 , maka terjadi peristiwa ....
Write a ratio in words to compare a whole to a part. Then write the ratio using words. An example is needed
Answer:
A ratio in words compares a whole to a part. For example, the ratio of apples to oranges in a basket is "three to one." This can also be written as "3:1" or "3/1."
Another example: is the ratio of students to teachers in a class is "twenty to one." This can also be written as "20:1" or "20/1."
Step-by-step explanation:
What is AC?
A. 25‾√
B. 35‾√
C. 6
D. 9
The side length of AC is 6 units for the shown triangle. The correct answer would be an option (C).
What are Similar Triangles?Similar Triangles are defined as two triangles with the same shape, equal pair of corresponding angles, and the same ratio of the corresponding sides.
The right triangle is given in the question, as shown.
AD = 4 cm and BD = 5
In ΔACD and ΔABC
∠ACD = ∠ABC
∠ACD = ∠BAC = 90°
∠CAD = ∠ACD (remaining)
So ΔACD and ΔABC are similar
Hence
AD / AC = AC/ BC
Apply the cross-multiplication operation, and we get
AC² = AD × BC
AC² = 4 × 9
AC² = 36
AC = 6 cm
So, the side length of AC is 6 units.
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8th grade is hard and I do online school it’s hard for me to learn
A. We can see that the intersection made by lines C and D classifies ∠7 and ∠8 as vertically opposite angles.
B. The special angles created by intersection of lines C and D can be used to solve for y by equating the expressions, 5y-29 and 3y+19 as they are vertically opposite angles.
C. Solving for y, we have: y = -5
What is intersection?Intersection, in mathematics, refers to the common elements or overlap between two sets. For example, if set A contains the elements 1, 2, and 3, and set B contains the elements 2, 3, and 4, then the intersection of set A and set B would be the set containing the element 2 and 3. In general, intersection is represented by the symbol ∩. Lines can also intersect to form angles.
Vertically opposite angles are actually known to be equal. It then means that:
∠7 = ∠8 (Vertically opposite angles)
Also, 5y-29 = 3y+19 (Vertically opposite angles)
Thus, solving for y, we have:
5y-29 = 3y+19
5y - 29 -29 = 3y + 19 - 29
5y -3y = - 10
2y = -10
y = -10/2 = -5
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I need help in this problem
The measurement of indicated angle is 20 degree.
What is congruent angle?Congruent angles are those with equal measure. As a result, all angles with equal measure will be referred to as congruent angles.All congruent angles are not supplementary angles in general. Angles that add up to 180 must be supplementary angles. So only right angles and supplementary angles are congruent because they have the same measure and add up to 180.If the corresponding sides and angles of two angles are of equal size, they are said to be congruent. Two angles that are superimposed are also congruent. That is, if they turn and/or move to coincide with each other. The diagonals of a parallelogram also produce congruent vertex angles.Here opposite angles are congruent .
Therefore the indicated angle is 20 degree.
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Which of the following is the equation of a line parallel to 3y = 6x + 5 that passes through (3, 3)? A. y = 2x - 1 B. y = 2x - 3 C. y + 2x = 1 D. y + 3 = 6x
First, we should find the slope of the line we're starting with.
3y = 6x + 5 can be put into slope-intercept form by dividing both sides by 3.
y = 2x + 5/3
The slope of this line is 2.
A parallel line has to have a slope of 2 as well, so we know we're looking for a line with a slope of 2.
Options A and B have that. Options C and D do not.
Now if (3,3) is a point on the line, then (3,3) must also be a solution for the equation.
Checking Option A:
3 = 2(3) - 1 is not true. 3 ≠ 6 - 1
Checking Option B:
3 = 2(3) - 3 is true. 3 = 6 - 3
Option B is the answer, since it has the right slope and works for the point (3,3).
Answer:
B) y = 2x - 3
Step-by-step explanation:
3y = 6x + 5 To put in the slope intercept form. Divide all the way through by 3
y = 2x + 5/3
When lines are parallel, they have the same slope.
So the slope will be 2. We will use the point to find the y intercept
m = 2
x = 3 This is from the point (3,3)
y = 3 this is from the point (3,3)
y = mx + b
3 = 2(3) + b
3 = 6 + b Subtract 6 from both sides
3-6 = 6- 6 + b
-3 = b
Now that we have the slope (2) and the y intercept (-3) we can write the equation.
y = mx + b
y = 2x -3
i need help please and thanks
equation of the line that is parallel to x-3y=9 and passes through the point (-10,9)
keeping in mind that parallel lines have exactly the same slope, let's check for the slope of the equation above
[tex]x-3y=9\implies -3y=-x+9\implies y=\cfrac{-x+9}{-3} \\\\\\ y=\cfrac{-x}{-3}+\cfrac{9}{-3}\implies y=\cfrac{1}{3}x-3\qquad \impliedby \begin{array}{|c|ll} \cline{1-1} slope-intercept~form\\ \cline{1-1} \\ y=\underset{y-intercept}{\stackrel{slope\qquad }{\stackrel{\downarrow }{m}x+\underset{\uparrow }{b}}} \\\\ \cline{1-1} \end{array}[/tex]
so we're really looking for the equation of a likne whose slope is 1/3 and it passes through (-10 , 9)
[tex](\stackrel{x_1}{-10}~,~\stackrel{y_1}{9})\hspace{10em} \stackrel{slope}{m} ~=~ \cfrac{1}{3} \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{9}=\stackrel{m}{ \cfrac{1}{3}}(x-\stackrel{x_1}{(-10)}) \implies y -9= \cfrac{1}{3} (x +10) \\\\\\ y-9=\cfrac{1}{3}x+\cfrac{10}{3}\implies y=\cfrac{1}{3}x+\cfrac{10}{3}+9\implies {\Large \begin{array}{llll} y=\cfrac{1}{3}x+\cfrac{37}{3} \end{array}}[/tex]
On March 14 at 1:59, people celebrate Pi Day by eating pie. Why do you
think people celebrate on thi day at thi time?
People celebrate Pi Day on March 14th at 1:59 because this date and time is an easy way to remember the mathematical constant pi (π).
Pi, which is represented by the Greek letter π, is an irrational number that starts with 3.14 and continues for an infinite amount of digits. The numerical value of pi is the ratio of a circle's circumference to its diameter, and is approximately equal to 3.1415926535897932384626433832795. The date and time of March 14th, 1:59 is a way to represent the first four digits of pi (3.14). People celebrate Pi Day by eating pie, making pi-related crafts, and sharing facts about pi. People celebrate Pi Day on March 14th at 1:59 because this date and time is an easy way to remember the mathematical constant pi (π).
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Use the distributive property to fill in the blanks below.
(3 x 5) + (3 x 2) = 3 × (_ + _)
Answer:
3 x (5 + 2)
Step-by-step explanation:
Just use the distributive property, it's very simple.
How do I evaluate the integral by interpreting it in terms of areas?
The process of evaluate the integral by interpreting it in terms of areas is by apply the summation rule on it.
The term called integral is defined as a mathematical object that can be interpreted as an area or a generalization of area.
Here we need to find the way to evaluate the integral by interpreting it in terms of areas.
As we all know that the integration symbol ∫ is an elongated S, suggesting sigma or summation.
Here on a definite integral, we have to use the above and below the summation symbol are the boundaries of the interval, [a, b].
Where the numbers a and b are x-values and are called the limits of integration and it specifically a is the lower limit and b is the upper limit.
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Reflected over the x-axis, then translated 6
units left
Write an equation to represent the function
Required equation to represent the translation 6 units left and reflected over x-axis is y = - (x + 6 ).
Let us consider the original equation be y = x.
Translation to the left by k unit is f(x) = f ( x + k )
Now the equation gets translated 6 units to the left represents as
y = ( x + 6 )
Now the reflected over the x-axis is represented by :
Here y -coordinates change the sign.
If ( x, y ) after reflection over x -axis it is ( x , -y ).
y = - ( x + 6 )
Equation to represents the reflected over x-axis and translated 6 units left of the original function y = x is written as y = - ( x + 6 ).
Therefore, the equation to represent the required translation and reflection is given by y = - ( x + 6 ).
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Consider the quadratic function f(x) = x2 – 5x + 12. Which statements are true about the function and its graph? Select three options. The value of f(–10) = 82 The graph of the function is a parabola. The graph of the function opens down. The graph contains the point (20, –8). The graph contains the point (0, 0).
The three (3) true statements about the quadratic function, f(x) = x^2 – 5x + 12 and its graph include the following:
A. The value of f(–10) = 82
B. The graph of the function is a parabola.
D. The graph contains the point (20, –8).
How to determine the true statements about this quadratic function?Generally speaking, the graph of a quadratic function would always form a parabolic curve because it is a u-shaped. For this quadratic function, the graph is a upward parabola because the coefficient of x² is positive and the value of "a" is greater than zero.
Next, we would determine the other true statements about the graph of this quadratic function:
At data point (-10, 82), we have the following:
Quadratic function, f(x) = 1/5 x² – 5x + 12
Quadratic function, f(x) = x²/5 – 5x + 12
Quadratic function, f(-10) = -10²/5 – 5(-10) + 12
Quadratic function, f(-10) = 82
At data point (20, -8), we have the following:
Quadratic function, f(x) = 1/5 x² – 5x + 12
Quadratic function, f(x) = x²/5 – 5x + 12
Quadratic function, f(20) = 20²/5 – 5(20) + 12
Quadratic function, f(20) = -8
In conclusion, the graph of this quadratic function, f(x) = x^2 – 5x + 12 does not contain the data point (0, 0) as shown in the image attached below.
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an alloy consists of steel gold and brass in the ratio 5:3:7 determine the amount of each metal in 150g of the alloy
Answer: 50g steel, 30g gold and 70g brass
Step-by-step explanation:
This means for every 5g of steel there is 3g of gold and 7g of brass. We will find how many g there are total for every 5g of steel.
5 + 3 + 7 = 15
Next, we will divide 150g by 15g to see how many times the ratio will "repeat" to create the 150g of alloy.
150g / 15g = 10g
Next, we will multiply each amount of metal in one ratio by 10.
5g * 10 = 50g steel
3g * 10 = 30g gold
7g * 10 = 70g brass
Answer:
Step-by-step explanation
150g of the alloy contains a certain amount of steel,gold and brass. We thus find the total ratio of steel,gold and brass which will be equal to 15 {5 + 3 + 7}If 15 which is the total ratio is equal to 150, what about 5 which is the ratio of steel?15=150g 5 * 150g/15[we cross multiply 5=? get 5 times 150 multiply by 15to get 50g of steel.
15=150g 3*150g/15 to get 30g of gold.3=?15=150g 7*150g/15 to get 70g of bras.7=?To confirm the answer, we take 50g of steel + 30g of gold + 70g of brass to get 150g of alloy.\
Can someone please find x for me? Thank you!
The value of the missing angle x of the triangle is; x = 18.67°
How to find the missing angles?The sum of angles on a straight line is 180 degrees. Thus, the supplementary angle to 130 degrees is;
180 - 130 = 50°
Now, the alternate angle to 80 degrees which will be located inside the triangle is 80°.
The sum of angles in a triangle is 180 degrees. Thus;
3x - 6 + 80 + 50 = 180
3x + 124 = 180
3x = 180 - 124
3x = 56
x = 56/3
x = 18.67°
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a blind man is alone on a deserted island. he has two blue pills and two red pills. he must take exactly one red pill and one blue pill or he will die. how does he do it?
Some of the other types of the separation process are used in every house and company. The process of segregating undesirable particles from necessary components is the essence of the separation method. We will study in-depth information about several physical separation techniques in this particular article. The discussion's conclusion would allow students to recognize various techniques and their importance.
The blind man could use one hand to separate the pills by color, for example by holding one group of pills in one hand and the other group of pills in the other hand. Then, he could reach into one hand and take one pill, and reach into the other hand and take one pill, ensuring that he has taken one red pill and one blue pill. Another way could be to put each color pill in a different pocket, so he can feel the different pockets and take one pill of each color.
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a basic variable in a linear system is a variable that corresponds to a pivot column in the coefficient matrix.T/F
True - the statement says that a basic variable corresponds to a pivot column in the coefficient matrix. From the definition of basic variables, basic variables correspond to the columns that have a leading 1's (pivot columns).
A mathematical system model based on the use of a linear operator is known as a "linear system" in systems theory. In contrast to nonlinear cases, linear systems often display considerably simpler traits and attributes.
In linear systems, the variables are really only multiplied with constants and then added together; they are never multiplied by each other. In order to express both static and dynamic relationships between variables, linear systems are used.
Something relating to a line is linear. To build a line, all of the linear equations are used. Any equation that doesn't result in a straight line is considered as non. It has a variable slope value and appears as a curve on a graph.
A linear system is one in which both the superposition and homogeneity principles hold true.
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may I have help with this please?
Does the table below represent a linear function? Why or why not.
Part 2 out of 2 Isabella spends $5.86 on paint brushes and paint. How many of each item does she buy? Complete the explanation how you found your answer. By using compatible numbers, you find a total of used guess and check to find that she buys items that had a total cost of $5.86. Then you paint brushes and jars of paint. Check Next
Based on the information, it can be concluded Isabella bought 2 paintbrushes and 3 jars of paint.
How many items can Isabella buy?The average of buying a product is 0.97, which means Isabella can buy a total of 5 items (0.97 x 5 = 4.85)
Based on this different combinations of products are possible, for example, 1 paintbrush and 4 jars or 3 jars and 2 paintbrushes. However, the one that fits the final price is:
2 paintbrushes x 0.95 = $1.9
3 jars of paint x 0.99 = $2.97
$2.97 + 1.9 = $4.87
Note: This question is incomplete, here is the missing information
The paintbrushes cost $0.95 and the jar of paint cost $.099
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A school district signs a contract to purchase 50 of the electric typewriters (normally selling for $129. 95) from ABC at a quantity discount of 18%. What price does the school district pay for each typewriter?
The price paid by school district for each typewriter after applying 18% quantify discount is equal to $106.56.
Regular selling price of each typewriter = $129.95
Number of typewriter required by school district = 50
Total cost of 50 type writers = $129.95 × 50
= $6497.5
Discount percent on whole quantity = 18%
18% of $6497.5
= ( 18 / 100 ) × $6497.5
= $1169.55
Total price paid by school district for 50 typewriters
= $6497.5 - $1169.55
= $5327.95
Price paid by school district for 1 typewriters
= $5327.95 / 50
= $106.559
= $106.56
Therefore, the price paid school district for each typewriter is equal to
$106.56.
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Charlie tested three cameras last weekend. The table below shows the number of pictures taken and how much time it took.
Answer: First camera: 5 Pictures per second, Second camera: 6 Pictures per second. Third camera: 7 Pictures per second. The Third camera is the fastest.
Step-by-step explanation: 40/8 = 5, 30/5 = 6, 28/4 = 7
A 3-kg bowling ball rolls at a speed of 5 m/s on the roof of the building that is 75 m tall.
Circle one: KE / GPE / both
Show your work for finding the values of each type of energy the object has:
KE GPE=mgh
Mass = Mass =
Velocity = Gravity (g) = 9.8 m/s2
Velocity2=Height =
KE = ½ (M) (V)2GPE=mgh
The ball has both kinetic energy and potential energy.
The values of each type of energy the object has are KE = 37.5 J and GPE = 2205 J
How to find the energy of the object?Energy is the ability to do work. It can take many forms, such as kinetic energy (energy of motion), potential energy (stored energy) etc.
If a 3-kg bowling ball rolls at a speed of 5 m/s on the roof of the building that is 75 m tall.
Then ball has kinetic energy due to his motion and also has potential energy due to his height.
Thus, M = 3-kg, h = 75 m and V = 5 m/s
KE = 1/2(M)(V)² = 1/2 × 3 × 5² = 37.5 J
GPE = mgh = 3 × 9.8 × 75 = 2205 J
KE + PE = 37.5 + 2205 = 2242.5 J
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The head of a hammer is located 9 cm to the left of its
center of mass, while the bottom of the handle of the
hammer is 29 cm to the right of the center of mass. Determine the length of the hammer. Justify your
answer using an appropriate geometry principle (definition, theorem, etc.)
The length of the hammer is given as follows:
30.36 cm.
How to obtain the length of the hammer?The Pythagorean Theorem states that for a right triangle, the length of the hypotenuse squared is equals to the sum of the squared lengths of the sides of the triangle.
The sides in this problem are given as follows:
9 cm and 29 cm.
The length of the hammer is the hypotenuse, hence it is obtained as follows:
l² = 9² + 29²
[tex]l = \sqrt{9^2 + 29^2}[/tex]
l = 30.36 cm.
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Which of the following triangle types is impossible to draw?
a scalene, right-angled triangle
an isosceles, acute-angled triangle
an isosceles, obtuse-angled triangle
an equilateral, right-angled triangle
The triangle types is impossible to draw is
an isosceles, obtuse-angled trianglean equilateral, right-angled triangleWhat is Right Angled Triangle?A right-angled triangle is a type of triangle that has one of its angles equal to 90 degrees. The other two angles sum up to 90 degrees. The sides that include the right angle are perpendicular and the base of the triangle.
Given:
First, a scalene with right-angled triangle is possible to make.
Now, an isosceles with acute-angled triangle is possible to make such triangle in which all three angles are less than 90°, and at least two of its angles are equal in measurement.
Now, an isosceles with obtuse-angled triangle is not possible to make because if two angles are greater than 90 then sum of angles exceed 180.
and, an equilateral with right-angled triangle is not possible to make because in Equilateral triangle are angles are of equal measurement 60.
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The area of a rectangle is 81m'n' square units. If the length of the rectangle is 9mn', how many
units wide is the rectangle?
Answer:
9
Step-by-step explanation:
9x9=81
Answer:
Step-by-step explanation:
So the rectangle is 9 units wide.
becuase given that the area of the rectangle is 81m'n' square units and the length of the rectangle is 9mn', we can set up the equation as:
81 = 9 x width
To solve for width, we can divide both sides of the equation by 9:
width = 81/9
width = 9
Find the surface area of a square pyramid with side length 2 m and slant height 3 m.
Answer: The surface area of a square pyramid with a side length of 2m and slant height of 3m is 12 square meters.
Step-by-step explanation:
The surface area of a square pyramid can be calculated using the formula:
Surface area = Base area + 4 * (Area of one of the lateral faces)
The base area of the pyramid is the area of the square base, which is the side length squared: 2m * 2m = 4m^2
To find the area of one of the lateral faces, we can use the Pythagorean theorem to find the length of the face, which is the hypotenuse of a right triangle with the slant height and half of the side length as the other two sides.
so, (1/2 * 2m)^2 + 3^2 = x^2
x= (1/2 * 2m)^2 + 3^2
x = 2
Therefore, the surface area of the pyramid is:
Surface area = 4m^2 + 4 * 2m^2 = 4m^2 + 8m^2 = 12m^2
So, the surface area of a square pyramid with a side length of 2m and a slant height of 3m is 12 square meters.
AJSKASJASJJAJSKJSAKSJAJKS What is x
(2x 2 −6x−5)+(−9x 2 +5x−4)
Answer: -15x - 9
Step-by-step explanation:
(2x ×2 −6x−5)+(−9x ×2 +5x−4)
(4x-6x-5)+(-18x+5x-4)
(-2x-5)+(-13x-4)
-2x-5-13x-4
-15x -
The value of the given equation is −7x2−x−9.
What is Algebra?Algebra is the study of abstract symbols, while logic is the manipulation of all those ideas.
The acronym PEMDAS stands for Parenthesis, Exponent, Multiplication, Division, Addition, and Subtraction. This approach is used to answer the problem correctly and completely.
We are given that;
The equation (2x 2 −6x−5)+(−9x 2 +5x−4)
Now,
We need to add the two polynomials by combining like terms. Like terms are terms that have the same variable and exponent. For example, 2x2 and −9x2 are like terms because they both have x2
To add like terms, we just add their coefficients. For example, 2x2+(−9x2)=(−7x2)
We can apply this rule to each pair of like terms in the problem and get:
(2x2−6x−5)+(−9x2+5x−4)
=(2x2+(−9x2))+(−6x+5x)+(−5+(−4))
=(−7x2)+(−x)+(−9)
=−7x2−x−9
Therefore, by algebra the answer will be −7x2−x−9.
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