The margin of error is inversely proportional to the sample size. As the sample size increases, the margin of error decreases.
What is the margin of error?The probability or the chances of error while choosing or calculating a sample in a survey is called the margin of error.
The margin of error is given as
[tex]\rm ME = z\times \sqrt{\dfrac{p(1-p)}{n}}[/tex]
We know that margin of error is inversely proportional to the sample size.
As the sample size increases, the margin of error decreases.
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A circle has a area of 49 pie cm2 work out its radius
Area of a circle: pi x r^2
49 pi = pi x r^2
49 = r^2
r = +/- 7
---In this case, the radius is a measurement, so the answer must be positive.
r = 7
Hope this helps!
Stan wants to start an ira that will have $250,000 in it when he retires in 25 years. how much should he invest semiannually in his ira to do this if the interest is 6% compounded semiannually? assume an annuity due. round to the nearest cent. a. $2,151.82 c. $2,303.29 b. $2,216.91 d. $4,556.68
Answer:A
Step-by-step explanation:
1/2x-20-x = 3(2x - 1) - (2x - 1)
Answer:
x = -4
Step-by-step explanation:
1/2x - 20 - x = 6x -3 -2x +1
-1/2x -20 = 4x -2
-1/2x -4x = -2 +20
-9/2x = 18
9/2x = -18
9x = -36
x = -4
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hope this helps :)
someone please help me to learn new things i am a 5th grade student and im hoping to learn new things in math
Answer:
Here you go!
Step-by-step explanation:
Do tell if it still seems difficult.
:)
Four graphs are shown below:
Four graphs named Graph A, Graph B ,Graph C and Graph D are shown with scale along x axis from 0 to 10 at increments of 1 and scale along y axis from 0 to 10 at increments of 1 and scale along y axis from 0 to 100 at increments of 10. All the graphs have 0,12 and 1,20 and 2,28 and 3,31 and 4,42 and 5,53 and 6,61 and 7,72 and 8,88 and 9,83 and 10,92. A straight line joins 0, 12 and 6,100 in Graph A. A straight line joins 0, 12 and 10, 50 in Graph B. A straight line joins 0, 10.5 and 10, 95 in Graph C. A straight line joins 0, 30 and 8,100 in Graph D.
Which graph best shows the line of best fit?
Graph A
Graph B
Graph C
Graph D
The graph that best shows the line of best fit is graph (c)
How to determine the best graph?A graph that shows the appropriate line of best fit has the following properties:
The line of best fit has equal approximately points on either sideThe line of best fit touches as many points as possibleThe graph that satisfies the above highlights is the graph (c)
Hence, the graph that best shows the line of best fit is graph (c)
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Answer:
c
Step-by-step explanation:
Q4. The diagram shows a triangle inside a rectangle.
2x
All measurements are given in centimetres.
Show that the total area, in cm², of the shaded regions is 18x - 30
3x-5
Diagram NOT
accurately drawn
The prove to show that the area of the shaded portion is 18x - 30 is as follows: 3x² + 13x - 30 - 3x² + 5x = 18x - 30
How to find the area of the shaded region?The area of the shaded region can be represented as follows:
area of the shaded region = area of rectangle - area of triangle
Therefore,
area of the rectangle = (x + 6)(3x - 5)
area of the rectangle = 3x² - 5x + 18x - 30
area of the rectangle = 3x² + 13x - 30
area of triangle = 1 / 2 × 2x × 3x - 5
area of triangle = 3x² - 5x
Therefore,
area of the shaded portion = 3x² + 13x - 30 - 3x² + 5x
area of the shaded portion = 18x - 30
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Which of the following tables represents a function?
Reason:
Choices A, C and D have repeated x values. It allows us to rule them out.
Table A has x = 6 repeating. Table C has x = 3 and x = -3 repeated. Table D has x = 4 and x = 5 show up twice each.
Whenever we have repeated x values, it indicates we do not have a function. A function is only possible when each x value goes to exactly one y value only.
Table A has the input x = 6 lead to y = 2 and y = -2 at the same time. Table C and table D are a similar story. So this is another way to rule out choices A, C and D.
Luckily table B has no repeated x values. Each x input leads to exactly one and only one y output. Therefore, table B is a function.
Side Note: the y values can repeat, but the function won't be one-to-one.
Find the indicated measures for each circle 0
Answer:
there are no indicate measure bro in circle
Step-by-step explanation:
Why was federal ruling system implemented in Nepal?Give any four reasons
Eva wants to estimate the number of rabbits on a farm.
On Monday, she catches 50 rabbits.
These rabbits are tagged and then released.
On Tuesday, she catches 100 rabbits.
12 of these rabbits have tags on them.
Estimate the number of rabbits on the farm.
Estimate the number of rabbits on the farm will be 417 rabbits.
What is Algebra?Algebra is the study of mathematical symbols, and the rule is the manipulation of those symbols.
Eva wants to estimate the number of rabbits on a farm.
On Monday, she catches 50 rabbits.
These rabbits are tagged and then released.
On Tuesday, she catches 100 rabbits.
12 of these rabbits have tags on them.
Then estimate the number of rabbits on the farm that will be
Let n be the number of total rabbits. Then we have
12n = 50 x 100
n = 5000 / 12
n = 416.67
n ≅ 417
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Name the types of angles shown.
L
M
Check all that apply.
A. straight angle
B. right angle
c. supplementary angles
D. complementary angles
Answer:
Ans : A. Straight angle
Step-by-step explanation:
Brainliest me pls
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Brain
Vector bought 15.6 pounds of paintballs. Ali together, the balls cost 35.99. About how much did the paintball cost per pound
Answer:
about $2.31 per pound
Step-by-step explanation:
35.99/15.6 = 2.30705128205
2.31
Have a good day! :)
What is a simpler form of the radical expression?
SOMEONE PLEASE HELP!!
Answer:
Choice B
Step-by-step explanation:
Given radical expression:
[tex] \sqrt[4]{1296 {x}^{16} {y}^{12} } [/tex]
To Find:
The Simpler form of this expression
Soln:
[tex] = \sqrt[4]{1296 {x}^{16} {y}^{12} } [/tex]
We could re-write the given expression, according to the law of exponents:
[tex] = \tt \sqrt[4]{(6x {}^{4}y {}^{3}) {}^{4} } [/tex]
Now we need to bring terms out of the radical as:
[tex] \tt = | 6x { }^{4} y {}^{3} | [/tex]
Bring out 6x^4 from the absolute & put y^3 only in it:
[tex] \tt = 6x {}^{4} |y {}^{3} | [/tex]
Choice B is accurate.
Solve the system of equations.
8x – y = 8
8x2 – y = 8
(0, 8) and (0, –8)
(1, 0) and (0, –8)
(2, 8) and (1, 0)
(3, 16) and (2, 24)
Answer:
(1, 0 ) and (0, - 8 )
Step-by-step explanation:
8x - y = 8 → (1)
8x² - y = 8 → (2)
since both equations are equal to 8 then equate the left sides
8x² - y = 8x - y ( subtract 8x - y from both sides )
8x² - 8x = 0 ← factor out 8x from each term
8x(x - 1) = 0
equate each factor to zero and solve for x
8x = 0 ⇒ x = 0
x - 1 = 0 ⇒ x = 1
substitute these values into (1) and solve for y
x = 0 : 8(0) - y = 8 ⇒ y = - 8 ⇒ (0, - 8 )
x = 1 : 8(1) - y = 8 ⇒ y = 0 ⇒ (1, 0 )
6. What is an equation of the line that passes through the point (6,8)
and is perpendicular to a line with equation y = 3
2x + 5?
(1) y − 8 = 2(x − 6)
(3) y + 8 =
2(x + 6)
(2) y - 8 = -(x − 6)
-
(4) y + 8 =
− ½(x + 6)
Answer:
x = 6
Step-by-step explanation:
y = 3 is a horizontal line parallel to the x- axis and passing through all points with a y- coordinate of 3
A line perpendicular to this will be a vertical line parallel to the y- axis with equation
x = c ( c is the value of the x- coordinates the line passes through )
the line passes through (6, 8 ) with x- coordinate 6 , then
x = 6 ← equation of perpendicular line
Which triangles are similar?
15
28
62
28
17
Triangle A
37
15
53
9
16
Triangle B
Triangle C
OA. Triangles B and C
OB. Triangles A and B
C. Triangles A and C
D. Triangles A, B, and C
62°
34
Answer:
triangle A andC are the same
20(6x4) Can you pls help me
Answer:
480
Step-by-step explanation:
We will use the order of PEMDAS. First, everything in parenthesis must be completed. Since 6x4 is in parenthesis, we multiply it and get 24.
Since we now have 20(24). We can multiply them by each other.
A trick to do this manually is to notice that 20 is 10 x 2, meaning that in reality this equation is 10 x 2 x 24. Multiply 2 x 24 = 48, and 48 x 10 = 480.
I need help with this
Answer:
The answer is B
Step-by-step explanation:
f(x) = -3x - 5
g(x) = 4x - 2
= -3x - 5 - (4x - 2)
= -7x - 3
Answer:
B. -7x - 3
Step-by-step explanation:
(f - g)(x) = f(x) - g(x)
f(x): -3x - 5
g(x): 4x - 2
f(x) - g(x) = (-3x - 5) - (4x - 2)
= -3x - 5 - 4x + 2
= (-3x - 4x) + (- 5 + 2)
= (-7x) + (-3)
Can someone help me with this??
find the circumference of an object. use 3.14 or 22/7 for pi. round to the nearest hundredth if necessary. 9 cm
Step-by-step explanation:
to find the circumference of an object take pie and the radius and multiply it by 2
equation: 2 pie r
if r is 9 the answer is 56.55
9x2=18
18xpie=56.55
Graph the equation y =3/5 x on the coordinate plane.
Step-by-step explanation:
See above graph.......
i dont now this question
Answer:
y = 108
Step-by-step explanation:
2x + 16 = 3x -12 (as you can see the F shape and are on straight lines and AB is parallel to CD) .
Now we solve for x :
Subtract 2x from both sides :
16 = x - 12
Now we add 12 to both sides :
28 = x
Angle 3x-12 and y add up to 180 as they are on a straight line :
3x-12 + y = 180
Substitute x and solve for y :
3(28) - 12 + y = 180
84 - 12 + y = 180
72 + y = 180
y = 108
Hope this helped and have a good day
What are some examples of a linear system
Answer:
Describe the middle class of Central America. Mention jobs, homes, and education.ury
Step-by-step explanation:
Evaluate each function.
14) g(x)= 3x² - 1; Find g(-3)
Answer:
g(-3)= 26
Step-by-step explanation:
g(x)= 3x² - 1
g(-3) means use -3 for x in the given equation.
g(-3)= 3(-3)² - 1
g(-3)= 3(9) - 1
g(-3)= 27 - 1
g(-3)= 26
Show and explain how replacing one equation by the sum of that equation and a multiple of the other produces a system with the same solutions as the one shown.
8x + 7y = 39
4x – 14y = –68
Answer:
Sample Response: Using the linear combination method, you can multiply the first equation by 2 and add the equations to get 20x = 10. Dividing both sides by 20, x = 1/2. To solve for y, substitute 1/2 for x in the equation 8x + 7y = 39 to get 4 + 7y = 39. Solving this equation, y = 5. Checking this in the other equation, 4(1/2) – 14(5) = –68 results in 2 – 70 = –68 or –68 = –68. The solution of the system shown is (1/2, 5). The system 8x + 7y = 39 and 20x = 10 is formed by replacing 4x –14y = –68 by a sum of it and a multiple of 8x + 7y = 39. Since 20(1/2) = 10, the system 8x + 7y = 39 and 20x = 10 also has a solution of (1/2, 5).
Hope this was helpful..
What is the slope intercept form of the 2 points (-6,-3) and (6,-7)
Payton collected data to show the relationship between the number of hours he practices and the number of errors he makes when playing a new piece of music. The table shows his data.
A 2-row table with 9 columns. The first row is labeled number of hours with entries 1, 2, 3, 4, 5, 6, 7, 8. The second row is labeled number of errors with entries 36, 34, 30, 31, 23, 16, 11, 5.
Which is the approximate slope of the line of best fit for the data?
Using a calculator, it is found that the approximate slope of the line of best fit for the data is of -4.54762.
How to find the slope of the line of best fit?
The slope is found inserting the points (x,y) in a calculator. In this problem, the points are as follows:
(1, 36), (2,34), (3,30), (4,31), (5,23), (6,16), (7,11), (8,5).
Hence, using the calculator, the slope is of -4.54762.
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1. Solve the equation using square roots.
x² +10=9
Answer:
x=±√−1 (NO REAL SOLUTION)Step-by-step explanation:
x² + 1 = 0
1× x²+1=0
x=±√(−1×1)
x=±√−1 (NO REAL SOLUTION)
Malaki constructed \overline{CG}
CG
start overline, C, G, end overline parallel to \overline{AB}
AB
start overline, A, B, end overline through point CCC.
Which of the following statements best justifies why \overleftrightarrow{CG}
CG
C, G, with, \overleftrightarrow, on top is parallel to \overleftrightarrow{AB}
AB
A, B, with, \overleftrightarrow, on top?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Lines perpendicular to the same transversal are parallel.
(Choice B)
B
Lines with supplementary same-side angles are parallel.
(Choice C)
C
Lines with congruent alternate interior angles are parallel.
(Choice D)
D
Lines with congruent corresponding angles are parallel.
Answer: Lines with congruent corresponding angles are parallel.
CG is parallel to AB because Lines with congruent corresponding angles are parallel.
How to define transverse lines?From the given image, we see that there is a transverse line cutting across lines AB and CG.
Now, from transverse line theorem we know that If two parallel lines are cut by a transversal, the corresponding angles are congruent. If two lines are cut by a transversal and the corresponding angles are congruent, the lines are parallel.
Thus, we can conclude that CG is parallel to AB because Lines with congruent corresponding angles are parallel.
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-7–2.1n=-3.5n PLEASE ANSWER
Answer:
n=5
Step-by-step explanation:
-7-2.1n=-3.5n
+2.1n +2.1n
-7 = -1.4n
/-1.4 /-1.4
n=5
Hope this helps!
If not, I am sorry
Answer:
b = - 1.25
Step-by-step explanation:
-7 - 2.1n = 3.5n
-7 = 3.5n + 2.1n
-7 = (3.5+2.1)n
-7 = 5.6n
-7/5.6 = n
n = -1.25
Check:
-7 -(2.1*-1.25) = 3.5*-1.25
-7 + 2.625 = -4.375
PLEASE HELPPPPP ME, IVE BEEN STUCK ON THIS ONE!!..
Answer:
C. 9 minutes 30 seconds
Step-by-step explanation:
well you could estimate it or just add 2.5 to 6.9 and you would get pretty close to the answer
Have a good day! :)