Determine the sign of cos pi divided by seven without using a calculator.
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now, when you get a fraction of π for the angle, is just really like grabbing π and dividing it in that many pieces, and the angle, is a fraction of π and therefore on those pieces.
π/7 is clearly less than 7π/7 which is π, notice the 7-pieces split in the picture.
Related Questions
HELP PLEASE!!!!!!!!!
Answers
Therefore we can just subtract 62 and 53 from 180 and you'll get x
180 - 62 - 53 = x
X = 65°
So the answer is the third choice
11.) suppose the correlation between two variables r=0.23. What will the new correlation be if 0.14 is added to all values of the x-variable, every value of the y-variable is double, and the two variables are interchanged?
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The correlation coefficient r=0.23 will remain unchanged at 0.23 even after adding a constant to all x-variable values, doubling the y-variable values, and swapping the x and y variables, because the correlation coefficient is unaffected by such transformations.
The correlation between two variables is denoted by the symbol, r, and it measures the strength and direction of a linear relationship between two quantitative variables. When we add a constant to all values of the x-variable or multiply all values of the y-variable by a constant, the correlation coefficient does not change. However, interchanging the x and y variables also does not change the value of r since correlation is symmetrical. Therefore, if r=0.23 initially, after adding 0.14 to all values of x, doubling the y-variable values, and interchanging the two variables, the new correlation will still be 0.23.
What are the x and y-intercepts of the line described by the equation? 3x−9y=10.8 Enter your answers, in decimal form, in the boxes.
Answers
x-intercept when y = 0
3x =10.8
x = 3.6
y-intercept when x = 0
−9y=10.8
y = - 1.2
answer
x-intercept (3.6, 0)
y-intercept (0, -1.2)
Answer: The x-intercept and y-intercept of the given line are (3.6, 0) and (0, -1.2) respectively.
Step-by-step explanation: We are given to find the x-intercepts and y-intercepts of the line described by the following equation :
[tex]3x-9y=10.8~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
We know that
the x-intercept of a line is the point where the y co-ordinate is 0. Similarly, y-intercept is the point where the x co-ordinate is 0.
Substituting y = 0 in equation (i), we get
[tex]3x-9\times0=10.8\\\\\Rightarrow 3x-0=10.8\\\\\Rightarrow 3x=10.8\\\\\Rightarrow x=\dfrac{10.8}{3}\\\\\Rightarrow x=3.6.[/tex]
So, x-intercept is (3.6, 0).
And substituting x = 0 in equation (i), we get
[tex]3\times 0-9y=10.8\\\\\Rightarrow 0-9y=10.8\\\\\Rightarrow 9y=-10.8\\\\\Rightarrow y=-\dfrac{10.8}{9}\\\\\Rightarrow y=-1.2.[/tex]
So, y-intercept is (0, -1.2).
Thus, the x-intercept and y-intercept of the given line are (3.6, 0) and (0, -1.2) respectively.
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Which postulate or theorem proves that △RMN and △QPN are congruent?
A. AAS Congruence Theorem
B. SSS Congruence Postulate
C. ASA Congruence Postulate
D. SAS Congruence Postulate
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Answer: C. ASA Congruence Postulate proves that △RMN and △QPN are congruent.
Given: △RMN and △QPN where RN=NQ and ∠R=∠Q
To prove: △RMN ≅△QPN
Proof:- In △RMN and △QPN
∠R=∠Q............[given]
RN=NQ............[given]
∠RNM=∠PNQ............[vertically opposite angles]
∴△RMN ≅△QPN [by ASA Congruence Postulate ]
Therefore,C. is the right answer. ASA Congruence Postulate proves that △RMN and △QPN are congruent.
ASA Congruence Postulate states that is two angles and the included side is equal to the two angles and the included side of the other triangle, then the triangles are said to be congruent.
A student is reading his book at a rate of 15 pages per day.
a. Write the rate in pages per week.
b. Write the rate in pages per hour.
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b) There are 24 hours in one day. If the student is reading 15 pages in 24 hours, then the student is reading 0.625 pages in a hour (approximately more than half of a page but less than one full page).
Which state of matter has neutral particles that bounce off one another as they collide?
Gas
Liquid
Plasma
Solid
Answers
The answer is gas because gas particles move so fast they bounce off one another when they collide. Plasma has Negatively AND Positively charged particles within it.
Gases are the state of matter where neutral particles bounce off one another as they collide. This is due to their constant, random motion and the elastic nature of their collisions.
Explanation:The state of matter that has neutral particles that bounce off one another as they collide is a Gas. This is due to the fact that gases are composed of a large number of particles that are in constant, random motion. These particles collide with each other and with the walls of their container. Importantly, these collisions are perfectly elastic, meaning they conserve both momentum and kinetic energy.
In Liquids and Solids, the particles are held together with stronger intermolecular forces which restrict their motion. In Plasma, the particles are ionized and hence, are not neutral.
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What is the difference between a plane (in geometry) and a piece of paper?
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A piece of paper that is lying flat has a finite length and width a some thickness. A piece of paper lying flat is part of a plane.
what strategies can be used to divide whole numbers?
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2. Ask yourself how many times (think multiplication) will the divisor go into the dividend without going over.
3. Bring down the next digit in the dividend.
4. Now divide the divisor to that number.
5. Repeat steps 2 and 3 if necessary until final answer is reached.
if it's still confusing or it doesn't answer your question, you can always use a calculator :)
1.75 feet, 1 7/12 feet, and 1 2/3 feet which is the length of the longest bar and what was the length for the shortest bar?
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Write an equation of the line containing the point (3,1) and perpendicular to the line 4x−3y=5.
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Write the equation in standard form.
3y + 5 = 4x
3y = 4x - 5
[tex]y= \frac{4}{3}x- \frac{5}{3} [/tex]
This is a straight line with slope = 4/3, and with y-intercept = - 5/3.
A perpendicular line should have a slope of -3/4, because the product of the slopes of two perpendicular lines is -1.
Let the perpendicular line be
[tex]y=- \frac{3}{4}x+b [/tex]
Because the line passes through the point (3,1), therefore
[tex]- \frac{3}{4}(3)+b=1 \\\\ - \frac{9}{4}+b=1 \\\\ b=1+ \frac{9}{4}= \frac{13}{4} [/tex]
The equation of the perpendicular line is
[tex]y=- \frac{3}{4}x+ \frac{13}{4} [/tex]
The equation may also be written as
4y + 3x = 13.
A graph of the two lines is shown below.
Answer:
[tex]y=- \frac{3}{4}x+ \frac{13}{4} \,\, or \,\, 4y+3x=13 [/tex]
Final answer:
To find the equation of the line perpendicular to 4x-3y=5 that passes through (3,1), we determine the negative reciprocal of the original line's slope, which is -3/4, and use the point-slope form to establish the new line's equation:
y = (-3/4)x + 13/4.
Explanation:
To write an equation of the line containing the point (3,1) and perpendicular to the line 4x−3y=5, first, we need to find the slope of the given line by rearranging the equation into slope-intercept form (y=mx+b), where m is the slope.
The line 4x - 3y = 5 can be rewritten as 3y = 4x - 5, or y = (4/3)x - 5/3. This gives us a slope of 4/3. The slope of a line perpendicular to this will be the negative reciprocal, hence the perpendicular slope is -3/4.
Next, given the point (3,1), we can use the point-slope form of a line's equation, which is y - y₁ = m(x - x₁), where (x₁,y₁) is the point the line passes through, and m is the slope. Substituting the values, we get y - 1 = (-3/4)(x - 3).
Finally, to express the equation in slope-intercept form (y=mx+b), we expand and simplify: y - 1 = (-3/4)x + 9/4, which gives us y = (-3/4)x + 13/4 as the equation of the line.
Factor. 2xy+5x−12y−30
Answers
x(2y + 5) - 6( 2y + 5)
(2y+5) (x-6)
Answer: The required factored form of the given expression is [tex](x-6)(2y+5).[/tex]
Step-by-step explanation: We are given to factorize the following expression :
[tex]E=2xy+5x-12y-30~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
We will be using the following property :
[tex]a(b+c)+d(b+c)=(a+d)(b+c).[/tex]
From expression (i), we have
[tex]E\\\\=2xy+5x-12y-30\\\\=x(2y+5)-6(2y+5)\\\\=(x-6)(2y+5).[/tex]
Thus, the required factored form of the given expression is [tex](x-6)(2y+5).[/tex]
What is an equivalent expression for 1.5(3x + 4) + 0.25(6x + 8)?
Answers
4.5x+6+1.5x+2
6x+8
An expression is defined as a set of numbers, variables, and mathematical operations. An equivalent expression for 1.5(3x+4)+0.25(6x+8) is 7x+8.
What is an Expression?In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.
The given expression can be simplified as,
1.5(3x + 4) + 0.25(6x + 8)
= 4.5x + 6 + 2.5x + 2
= 7x + 8
Hence, an equivalent expression for 1.5(3x+4)+0.25(6x+8) is 7x+8.
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Louis spent 12 hours last week practicing guitar. If 1/4 of the time was spent practicing chords, how much time did Louis spend practicing chords?
Answers
Time spent practicing chords is
(1/4)*(12 hours) = 3 hours
Answer: 3 hours
Final answer:
Louis spent a total of 3 hours practicing chords last week, which is 1/4 of the total 12 hours he dedicated to practicing guitar.
Explanation:
Louis spent 12 hours last week practicing guitar. To calculate the amount of time he spent practicing chords, we need to find 1/4 of 12 hours since 1/4 of the time was dedicated to chords.
Here is the calculation:
Divide the total time by 4 to find 1/4 of 12 hours: 12 hours ÷ 4 = 3 hours.
So, Louis spent 3 hours practicing chords last week.
Which of the following are steps in practical problem solving? Assign an identifying variable to the quantity to be found. Make a guess at the value of the variable. Write a sentence stating conditions placed on the quantity. Check if the value is correct. Solve the sentence for the variable.
Answers
Assign an identifying variable to the quantity to be found.
Write a sentence stating conditions placed on the quantity.
Solve the sentence for the variable.
Answer:
1. Assign an identifying variable to the quantity to be found.
2. Write a sentence stating conditions placed on the quantity.
3. Solve the sentence for the variable.
If AB= BC and BC= CD, then AB= CD
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does anyone know this?
Answers
Describe the steps in solving the linear equation 3(3x-8)=4x+6
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The value of x is 6.
Given,
3(3x-8)=4x+6
We need to solve for x and show steps by steps.
What are the properties used in solving a linear equation?Distributive property of multiplication over addition.
: a ( b + c ) = a x b + a x c
Distributive property of multiplication over subtraction.
: a ( b - c ) = a x b - a x c
Combining like terms.
: cx + ax + b = x (c + a) + b
: cx - ax - b = x (c - a) + b
We have,
3(3x-8)=4x+6
Removing the brackets.
3x(3x) - 3x8 = 4x + 6
9x - 24 = 4x + 6
Subtracting 4x on both sides.
9x - 24 - 4x = 4x + 6 - 4x
5x - 24 = 6
Adding 24 on both sides.
5x - 24 + 24 = 6 + 24
5x = 30
Dividing 5 into both sides.
5x/5 = 30/5
x = 6
Thus the value of x is 6.
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Hank is painting his grandfather's fence. He painted 40 linear feet in 85 minutes. He still has 360 linear feet to paint. His cousins, Sam and Alex, come to help. Sam paints twice as fast as Hank, and Alex paints half as fast as Hank. Find the constant of proportionality for the fence painting rate of Hank, Sam, and Alex combined.
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Which correlation coefficient represents the strongest relationship between two variables?
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If the discriminant is 16 in a quadratic equation what is true about its solutions
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If the discriminant in a quadratic equation is 16, a positive number, then the quadratic equation will have two distinct real solutions.
Explanation:In mathematics, particularly in quadratic equations, the discriminant plays a vital role in determining the nature of the solutions. The discriminant in a quadratic equation is the part under the square root in the quadratic formula, and it is usually represented by the symbol Δ (Delta). The quadratic formula is given by x = [-b ± sqrt(Δ)] / 2a. Now, if the discriminant is 16 (a positive number), then the quadratic equation will have two distinct real solutions. This is because the square root of a positive number yields two real numbers (one positive and one negative) which provide the two solutions when substituted back into the quadratic formula.
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The length of the base of an isosceles triangle is 15. what is the range of possible lengths l for each leg?
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so the range is 7.5 < L < ∞
The range of possible lengths for each leg of the triangle will be greater than 7.5.
What is the triangle?The polygonal shape of a triangle has a number of sides and three independent variables. Angles in the triangle add up to 180 °.
The two triangular legs and their opposing angles are congruent in an isosceles triangle.
For a triangle, the sum of the two sides should be greater than the longest side of the triangle.
The length of the foundation of an isosceles triangle is 15.
Let the isosceles sides of the triangle be 'x'. Then the inequality is given as,
x + x > 15
2x > 15
x > 7.5
The range of possible lengths for each leg of the triangle will be greater than 7.5.
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Identify the vertex, the axis of symmetry, the maximum or minimum value, and the range of each parabola.
1.) Y=x^2+4x+1
Write each function in vertex form.
1.) Y=x^2+2x+5
A model for a company's revenue from selling a software package is R= -2.5p^2+500p, where p is the price in dollars of the software. What price will maximize revenue? Find the maximum revenue.
Answers
#1: a=1, b=4
x=(-4/2*1)=-2
Plug in x=-2 in the equation to find out the value of y: when x=-2, y=-3
so the vertex is at (-2, -3), the symmetry line is x=-2
the equation in vertex form is y=[x-(-2)^2]-3 =>y=(x+2)^2-3
Since the coefficient, a, of x^2, is 1 in this case, a positive number, the parabola opens upward, the equation has a minimum value, which happens at x=-2, and the minimum value is -3
use the same method for the other two questions
For the following inequality, indicate whether the boundary line should be dashed or solid. 3x ≥ y + 1 dashed solid
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Answer:
The boundary line should be solid because it have a 'great/less than or equal to' sign
Step-by-step explanation:
Predict the number of students out of 400 that would pick science(3) as their favorite subject
Math=6
Science=3
English=4
History=7
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XY=11d\ YZ=9d-2\ \ xz=5a+22
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D = 2 YZ = 16
A=6 YZ= 38
Rewrite 1/x^-3/6 in simplest radical form. show each step of your process
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[tex]\bf \cfrac{1}{x^{-\frac{3}{6}}}\implies \cfrac{1}{\frac{1}{x^{\frac{3}{6}}}}\implies \cfrac{\frac{1}{1}}{\frac{1}{x^{\frac{3}{6}}}}\implies \cfrac{1}{1}\cdot \cfrac{x^{\frac{3}{6}}}{1}\implies x^{\frac{3}{6}}\implies x^{\frac{1}{2}}\implies \sqrt[2]{x^1} \\\\\\ \sqrt{x}[/tex]
11x+7y=49 in y=mx+b format
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y=7-11x/7
y=-11x/7+7
I think?
-11x -11x
7y=49-11x
÷7 ÷7
y=7-1.6x
so the answer is y=-1.6x+7
Giving Brainliest! Use graphs and numerical summaries to help you describe how the following three datasets are similar and how they are different (think mean, median, range, and sample standard deviation).
A: 5, 7, 9, 11, 13, 15, 17
B: 5, 6, 7, 11, 15, 16, 17
C: 5, 5, 5, 11, 17, 17, 17
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Consider the following equation, bh+hr=25 when solving for r
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You want to get r by itself on one side on the equal sign.
bh + hr = 25
Subtract bh from both sides.
hr = 25 - bh
Divide h on both sides.
r = 25 - bh / h
The two h's cancel each other out.
r = 25 - b
Hope this helps!
Answer:
[tex]r=\frac{25-bh}{h}[/tex]
Step-by-step explanation:
Given : Consider the following equation, [tex]bh+hr=25[/tex]
To find : Solving for r ?
Solution :
The equation is [tex]bh+hr=25[/tex] solve for r,
Subtract 'bh' both side,
[tex]bh+hr-bh=25-bh[/tex]
[tex]hr=25-bh[/tex]
Divide both side by 'h',
[tex]\frac{hr}{h}=\frac{25-bh}{h}[/tex]
[tex]r=\frac{25-bh}{h}[/tex]
Therefore, [tex]r=\frac{25-bh}{h}[/tex]
True or false: f(x) is a function
Answers
Answer:
False
Step-by-step explanation:
If f(x) is a function , then for each value of x there should be a single y values
For input 0 there is a output 0
for input 10, the output is 2
for input 15, output is 3
For input 5, we have two output 1 and 3
for single input 5, the function cannot have two outputs 1 and 3
So this f(x) is not a function