An integer between 1000 and 9999 inclusive is called balanced if the sum of its two leftmost digits equals the sum of its two right most digit. Therefore, there are 615 balanced integers .
If the common sum of the first two and last two digits is n ,
such that 1 ≤n ≤ 9 , there are n choices for the first two digits and n +1 choices for the second two digits (since zero may not be the first digit).
This gives:
∑⁹ₙ₋₁ n(n+1) balanced numbers.
If the common sum of the first two and last two digits is n, such that:
10≤ n ≤ 18
there are 19 - n choices for both pairs.
This gives : ∑ₙ ₁₀¹⁸ ( 19 - n)²
= ∑₁⁹ n²
= 285balanced numbers.
Thus, there are in total 330 + 285 = 615 balanced numbers.
Both summations may be calculated using the formula for the sum of consecutive squares, namely:
∑₁ⁿ k² = n (n+1) (2n + 1) / 6
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What is the classification of each system?
Drag the answers into the boxes to match each system.
The first system of equations is consistently independent, the second one is inconsistent, and the third one is consistently dependent.
What is a linear equation?It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.
If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.
It is given that:
The first system of equations:
4x + y = 8
x + 3y = 8
4/1 ≠ 1/3 = 1 (consistent independent)
The second system:
-4x + 6y = 2
2x - 3y = 1
-4/2 = -6/3 = 2 (incosistent)
The third system:
5x - 2y = 4
5x - 2y = 6
5/5 = -2/-2 ≠ 4/6 (consistent dependent)
Thus, the first system of equations is consistently independent, the second one is inconsistent, and the third one is consistently dependent.
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Identify the slope and y-intercept for the following equation.
-2y-10+2x=0
Slope:
Y-intercept:
The points (6,7) and (36,42) form a proportional relationship. Find the slope of the line through the points. Then use the slope to graph the line.
Answer:
The points (6,7) and (36,42) form a proportional relationship. Find the slope of the line through the points. Then use the slope to graph the line.
Step-by-step explanation:
to find slope from 2 points you do delta y over delta x meaning
42 - 7 over 36 - 6 which equals to 35/ 30 which simplifies down to 7 over 6 or 7/6 so the slope of the line is 7/6 to graph it you need the b to get the b you take one of the points and the slope and do y = mx + b.
42 = 7/6(36) + b
42 = 42 + b
subtract 42 from both sides right to left to get variable alone
0 = b so
y = 7/6x + 0 but you never put the 0 you just leave at
y = 7/6x and graph. Start at 0 go up 7 to the right 6
P.S. I was bored so I felt like doing the rest of it ^_^
Write the inverse of the given relation.
y=x/2+5
Answer: f^−1(x)=2x−10
Explanation: switch the x and y to get:
x = y/2 + 5
Then isolate y by multiplying 2 on both sides and moving 10:
2x = y + 10
- 10 -10
2x -10 = y
Point J (-1,4) is reflected over the line y = 2. What is the coordinates for J’?
Answer:
(-1, -4)
Step-by-step explanation:
Make the y value the opposite value.
as a farmer who is interested in data-driven decision-making, you want to find out the effect of 3 fertilizers on the yield of your crop. which of the following hypothesis testing would you use to determine if there is any difference in the yield between the three fertilizers:
For a farmer interested in data-driven decision-making regarding effect of 3 fertilizers on the crop yield the hypothesis testing used to determine any potential difference in the yield between the three fertilizers is ANOVA test (Option C).
Hypothesis testing refers to the statistical inference method utilized to determine if the available data sufficiently supports a particular hypothesis. Hypothesis testing enables decision makes to establish probabilistic statements about population parameters. ANOVA test stands for Analysis of Variance and refers to a statistical test utilized to evaluate the difference between the means of more than two groups. A one-way ANOVA uses one independent variable and a two-way ANOVA uses two independent variables. As the farmers want to evaluate the difference between three fertilizers' effect on crop yield, the appropriate test is ANOVA test.
Note: The question is missing options which are a) Two sample t-tests. b) Paired t-test. c) ANOVA test. d) One sample t-test.
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-2.12 = u/2 + 3 solve for u
Answer:
-10.24
You can double check this answer by plugging it in for u, so -10.24 dived by 2 then plus 3, which indeed equals -2.12
so, u does equals -10.24
algebra 2 please help fast!!
The zeroes of the polynomial are -2,1,3,-1
What are the zeroes of the polynomial?The locations where a polynomial becomes 0 overall are known as the zeros of the polynomial. The term "zero polynomial" refers to a polynomial with a value of zero (-1). The largest power of the variable x is referred to as a polynomial's degree.
How do you find the zeroes of the polynomial?In general, the value of P(k) at x = k is denoted by P(k), and it can be found by substituting x by k in P if P(x) is a polynomial in x and k is any real number. The real number k is referred to as the zero of a polynomial P(x) if P(k) = 0.
Given:- The polynomial is f(x)=(x+2)(x-1)(x-3)(x+1)
The polynomial is divided into its factors
we equate each of the factors with the term 0
x+2=0
x=-2
x-1=0
x=1
x-3=0
x=3
x+1=0
x=-1
Hence the zeroes of the polynomial f(x)=-2,-2,1,3
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Taylor bought some dog grooming and pet supplies from an online store. For shipping, the store charges a fee of $8.95 or 5.5% of the total
purchase, whichever is greater. If Taylor's total purchase is $140, how much shipping will he pay?
The Taylor has to pay $8.95 as shipping charge for his total purchase of some dog grooming and pet supplies for $140.
What is percentage?Percentage, which meaning "per 100," designates a portion of a total sum. 45 out of 100 is represented by 45%, for instance. Finding the percentage of all of it in measures of 100 is what percentage calculation is.To Determine Percent
Calculate the total or entire amount.Divide the sum by the amount to also be expressed in percentage form. The lower number will often be divided by the bigger amount.The result is multiplied by 100.Here given shipping charge ,
Shipping charge = $8.95 or 5.5% of total purchase, which is greater.
Total purchase of Taylor = $140.
Here given shipping charge = 5.5 % of $140.
5.5 % of 140
= (5.5 /100)*140
= (5.5*140) / 100
= 770 / 100
= 7.7
5.5 % of total purchase = $7.7
Since $8.95 is greater that $7.7.
They take $8.95 as shipping charge.
Therefore the Taylor pay's $8.95 as shipping charge .
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What is the domain of f(x)?
{x| –4 < x ≤ 4}
{x| –3 < x ≤ 4}
{x| 1 < x ≤ 4}
{x| 2 < x ≤ 4}
The domain of the given function f(x) is {x| –4 < x ≤ 4}. Option A is correct.
First, let us understand the domain of a function:
The domain of a function is the set of all possible inputs for the function.
We are given the following;
All points of the step function f(x) are graphed.
We need to determine the domain of f(x).
The unfilled / open dot shows that we don't include that number.
The filled / closed dot shows that we can include that number.
So, we can see that it is open at -4 and closed at 4.
So, it is written as -4 < x and 4 ≥ x.
So, the domain is -4 < x and 4 ≥ x.
Thus, the domain of the given function f(x) is {x| –4 < x ≤ 4}. Option A is correct.
Please find the given graph below:
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need help with this one
The number of real solution of the system y = [tex]3x^2[/tex] and y = 3x - 2 is zero
The system of equations are
y = [tex]3x^2[/tex]
y = 3x - 2
Then the equation will be
[tex]3x^2[/tex] = 3x - 2
Move 3x - 2 to the left hand side of the equation
[tex]3x^2[/tex] - 3x + 2 = 0
Find the value of [tex]b^2[/tex] - 4ac
Here value of a = 3
The value of b = -3
The value of c = 2
Substitute the values in the expression
= [tex](-3)^2[/tex] - 4×3×2
= 9 - 24
= -15
Here the value of [tex]b^2[/tex] - 4ac is -15
Therefore there is no real valued solution
Hence, the number of real solution of the system y = [tex]3x^2[/tex] and y = 3x - 2 is zero
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the life expectancy of a particular brand of tire is normally distributed with a mean of 30,000 and a standard deviation of 6,000 miles. what is the probability that a randomly selected tire will have a life of at least 38,100 miles? a. 0.9115 b. 0.4115 c. 0.5885 d. 0.0885
The probability that a randomly selected tire will have a life of at least 38,100 miles is 0.9115.
What is probability?
Probability is a way to gauge how likely something is to happen. Many things are difficult to forecast with absolute confidence. Using it, we can only make predictions about the likelihood of an event happening, or how likely it is.
Let, the life expectancy of a particular brand of tire is normally distributed with a mean of 30,000 and a standard deviation of 6,000 miles.
So, μ = 30000, σ = 6000, x = 38100.
Therefore,
z = (x - μ) / σ
= (38100 - 30000) / 6000
= 8100 / 6000
= 81 / 60
z = 1.35
Now,
P(X = 38100) = P(z = 1.35) = 0.9115
Hence, the probability that a randomly selected tire will have a life of at least 38,100 miles is 0.9115.
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Jessie uses 20 liters of gasoline to travel 200 kilometers how many liters of gasoline will he use on a trip of 700 km.
Answer: 70 liters of gas
Step-by-step explanation:
Answer:
Jesse will use 70 liters of gasoline to travel 700 kilometers.
Step-by-step explanation:
Step one: Find how much gasoline is used for one kilometer.
20/200 = 0.1
0.1 liters of gasoline is used for every kilometer traveled.
Step two: Multiply by 700
0.1 x 700 = 70
Step three: Get your Answer!
Jesse will use seventy liters of gasoline to travel seven hundred miles.
Hope my answer helped, have a great afternoon!
Solve.
−5/6 = −1/4 − 7/10x
Enter your answer as a fraction in simplest form.
I don't know how brainly works :b
Answer:
[tex]\boxed{\sf x=\cfrac{5}{6}}[/tex]
Step-by-step explanation:
[tex]\sf -\cfrac{5}{6}=-\cfrac{1}{4}-\cfrac{7}{10}x[/tex]
[tex]\sf -\cfrac{1}{4}-\cfrac{7}{10} \; x=-\cfrac{5}{6}[/tex]
Add 1/4 to both sides:-
[tex]\sf -\cfrac{1}{4}-\cfrac{7}{10}x+\cfrac{1}{4}=-\cfrac{5}{6}+\cfrac{1}{4}[/tex]
Simplify:-
[tex]\sf -\cfrac{7}{10}x=-\cfrac{7}{12}[/tex]
Multiply both sides by 10:-
[tex]\sf 10\left(-\cfrac{7}{10}x\right)=10\left(-\cfrac{7}{12}\right)[/tex]
Simplify:-
[tex]\sf -7x=-\cfrac{35}{6}[/tex]
Divide both sides by -7:-
[tex]\sf \cfrac{-7x}{-7}=\cfrac{-\cfrac{35}{6}}{-7}[/tex]
Simplify:-
[tex]\sf x=\cfrac{5}{6}[/tex]
____________________
Hope this helps!
Have a great day! :)
Answer:
x = 5/6
Step-by-step explanation:
Given equation,
→ (-5/6) = (-1/4) - (7/10)x
Now the value of x will be,
→ (-5/6) = (-1/4) - (7/10)x
→ (-7/10)x = (-5/6) + (1/4)
→ (-7/10)x = (-10 + 3)/12
→ x = (-7/12) × (-10/7)
→ x = 10/12
→ [ x = 5/6 ]
Hence, the answer is 5/6.
solve for x PLSS HELP
Answer:
IMPORTANT- Triangle Sums up to 180.
Step-by-step explanation: According to the symbol, both sides are congruent. Which means they have the same degrees (Also known as an isosceles triangle). Since the left side of the angle measures 58.5 degrees, the right side angle is also 58.5. Sum up both sides --->
= 58.5+58.5 = 117
*every triangle sum to 180*
= Whole triangle degrees Subtract ( - ) to 117 = 180-117 = 63
So subtracting the whole triangle measure (180*) to 117 ( 117 is the degrees of both sides together) is 63. So "x" is equal to 63 degrees.
Answer: "x" equals 63 degrees.
For Double checking:
Turn "x" into 63 and add all the sides measures and check if it sum's up to 180 (which is the measure of the whole triangle.)
Numerical Setup for double-checking :
58.5+ 58.5 +X(63) =180
58.5 +58.5 +63 = 180
Giving 50 points :)))
Pls need help on #7!!!
Answer:
6
Step-by-step explanation:
Each coordinate is six times the corresponding coordinate in the preimage.
An air traffic controller is tracking two planes. To start, Plane A is at an altitude of 3500 feet and Plane B is at an altitude of 1970 feet. Plane A is gaining altitude
at 40.25 feet per second and Plane B is gaining altitude at 65.75 feet per second.
How many seconds will pass before the planes are at the
same altitude?
23.27 seconds
What will their altitude be when they're at the same
altitude?
feet
60.59 seconds will pass before the planes are at the
same altitude.
5953.79 ft is the altitude when they're at the same
altitude.
What is altitude?
The height at which something is relative to a planet's or a natural satellite's surface, like sea level or land
To answer this question, you need to determine the altitude difference and speed difference between plane B and plane A.
The initial altitude difference should be: 3500 feet-1970 feet= 1530 feet.
The speed difference should be: 65.75 ft/s - 40.25 ft/s= 25.5 ft/s
After that, you can determine how long will pass before the plane at the same altitude. The calculation would be:
Final altitude difference= Initial altitude difference + speed difference*time
0 ft= 1530 ft + (25.25ft/s * time)
25.25 time= -1530
time= 60.59 second
To determine the altitude you just need to sample either plane A or plane B. Let's use plane B for an easier initial altitude. The calculation would be:
Final altitude= initial altitude + speed*time = 1970 + 65.75 ft/s *60.59s= 5953.79 ft
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√12 is between _____.
Answer:
√12 is between 3 and 4.
Explanation
The number [tex]\sqrt{12}[/tex] is an irrational number that is between 3 and 4.
The given number is [tex]\sqrt{12}[/tex]
The irrational number is such a number that cannot be expressed in the form of p/q, and are nonterminating and non-repeating.
The number 12 is an irrational number since its value, 3.4641016, has no repeating or ending digits after the decimal, and it cannot be represented as a fraction.
The value [tex]\sqrt{12}[/tex] is 3.464101
So, the value [tex]\sqrt{12}[/tex] is between 3 and 4.
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I need help please!!
Answer:
1/2
Step-by-step explanation:
(-6-(-4)/(3-7)
(-6+4)/-4
-2/-4
1/2
The points R(4, t), S(3, 8) and T(1, 2) lie on a same straight line. Find the value of t.
well, we know that R, S and T are on the same straight line, hmmmm wait a second!! that means that the slope for RS must be the same as the slope for ST, heck, what's the slope for ST anyway?
[tex]S(\stackrel{x_1}{3}~,~\stackrel{y_1}{8})\qquad T(\stackrel{x_2}{1}~,~\stackrel{y_2}{2}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{2}-\stackrel{y1}{8}}}{\underset{run} {\underset{x_2}{1}-\underset{x_1}{3}}} \implies \cfrac{ -6 }{ -2 } \implies 3[/tex]
ahha!! that means that the slope for RS is really 3, hmmmm
[tex]R(\stackrel{x_1}{4}~,~\stackrel{y_1}{t})\qquad S(\stackrel{x_2}{3}~,~\stackrel{y_2}{8}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{8}-\stackrel{y1}{t}}}{\underset{run} {\underset{x_2}{3}-\underset{x_1}{4}}} ~~ = ~~\stackrel{\textit{\LARGE m}}{3} \\\\\\ \cfrac{8-t}{-1}=3\implies 8-t=-3\implies 11-t=0\implies 11=t[/tex]
Given (x – 7)^2 = 36, select the values of x.
x = 13, x = 1, x = –29, x = 42
Answer:
x = 13 x = 1
Step-by-step explanation:
(13-7) = 6
6^2 = 36
1-7 = -6
(-6)^2 = 36
Rewrite the following equation in slope-intercept form.
y + 9 = – (x + 10)
Write your answer using integers, proper fractions, and improper fractions in simplest form.
The slope-intercept form of the equation can be written as y = -x - 19
Slope - Intercept FormThe slope intercept form of a straight line is one of the most common forms used to represent the equation of a line. The slope intercept formula can be used to find the equation of a line when given the slope of the straight line and the y-intercept( the y-coordinate of the point where the line intersects the y-axis). Equation of line is the equation that is satisfied by each point that lies on that line.
The equation given is y + 9 = -(x + 10)
Rewriting this equation in y = mx + c format;
y + 9 = -(x + 10)
y + 9 = -x - 10
y = -x - 10 - 9
y = -x - 19
The equation is y = -x - 19
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Students are going to conduct an experiment to study the effect of a net force applied to an object on the object’s motion. In each trial of the experiment, the students will apply a net force on the object. They also need to take two other measurements. What are the other quantities they should measure in each trial of the experiment?.
For conducting experiment based on effect of a net force , to apply net force on the object two other quantities should be measured in each trial of the experiment is given by velocity and time.
As given in the question,
To conduct a experiment based on the effect of net force applied to an object the dependable quantities are as follow:
Force = mass × acceleration
As object remain same ⇒ mass is constant as object remain same.
And there is change in the acceleration.
Acceleration depends change in velocity over total time taken.
Acceleration depends on velocity and time.
Net force also depends on velocity and time.
Two measurements need to know while conducting trail experiments are velocity and time.
Therefore, to conduct experiment based on effect of a net force , to apply net force on the object two other quantities should be measured in each trial of the experiment is given by velocity and time.
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The relative frequency table describes the relationship between students who completed an exam review and their performance on the exam.
Passed exam Did not pass exam. Row Totals
Completed exam review 55% 10% 65%
Did not complete exam review 20%. 15% 35%
Column Totals 75% 25%. 100%
Part A: What is the percentage of students who passed the exam, given that they completed the exam review? Round to the nearest percentage. (2 points)
Part B: What is the percentage of students who passed the exam, given that they did not complete the exam review? Round to the nearest percentage. (2 points)
Part C: Is there an association between passing the exam and completing the exam review? Justify your answer. (2 points)
a) The percentage of students who passed the exam, given that they completed the exam review is of 73%.
b) The percentage of students who passed the exam, given that they did not complete the exam review, is of 27%.
c) There is a positive association between passing the exam and completing the exam review.
How to obtain the percentages?A percentage is obtained by the division of the desired amounts by the total amounts, multiplied by 100%.
For item a, these amounts are given as follows:
Desired: 55% that passed and completed the exam review.Total: 75% that passed.Hence the percentage is of:
p = 55/75 = 0.73 = 73%.
For item b, these amounts are given as follows:
Desired: 20% that passed and did not completed the exam review.Total: 75% that passed.Hence the percentage is of:
p = 20/75 = 0.27 = 27%.
There is a positive association between passing the exam and completing the exam review, as the percentage of students who passed completing the review, found in item a, is greater than the percentage of students who passed without completing the review, found in item b.
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5. A parabola has a directrix of y = -3 and a vertex
at (2,1). Which ordered pair is the focus of the
parabola?
The ordered pair of the force of the parabola will be (2, -1).
What is the parabola?It's the locus of a moving point that keeps the same distance between a stationary point and a specified line. The focus is a non-movable point, while the directrix is a non-movable line.
A parabola has a directrix of y = - 3 and a vertex at (2,1).
Since the directrix is upward, utilize the condition of a parabola that opens up or down.
(x − h)² = 4p(y − k)
The separation from the concentration to the vertex and from the vertex to the directrix is |p|. Deduct the worth of the directrix from the y direction of the vertex to track down p.
p = − 1 + 1 / 2
p = − 1/2
Then the equation is given as,
(x − 2)² = 4(1/2)(y + 1)
(x − 2)² = 2(y + 1)
The ordered pair of the force of the parabola will be (2, -1).
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you are constructing a box for your cat to sleep in. the plush material for the square bottom of the box costs 7 dollars per square foot and the material for the sides costs 3 dollars per square foot. you need a box with volume 4 ft3. use x to represent the length of the square base, and use h to represent the height of the box.
The height in terms of x is 4/x², the cost function is C(x) = 7x² + 16/x, and the dimensions for minimum cost are 2/∛7 and ∛14.
a)
It is given that we need to consider the length of the square side to be x ft and the height to be h ft.
The volume of any cuboid
= Length X breadth X height
Here,
length = breadth = x ft
height is h ft.
Volume id 4 ft³
Hence,
x²h = 4
or, h = 4/x²
b)
Since this is a box for the kitten to sleep in, it cannot have any lid.
Hence it will have one square side of area x² and 4 rectangular sides each of area xh
h = 4/x²
Hence,
xh = 4/x
The square bottom costs $7 per ft and the sides cost $4 per sq. ft
Hence cost to make the box
= 7x² + 4 X 4/x
= 7x² + 16/x
Hence, C(x) = 7x² + 16/x
c)
Here,
C(x) = 7x² + 16/x
Hence, to minimize the cost we will equate its first-order derivative with 0 to get
C'(x)= 0
or, 14x - 16/x² = 0
or, 14x³ - 16 = 0
or, 14x³ = 16
or, x³ = 16/14
or, x = 2/∛7
Hence h = 4∛14/4
= ∛14
Therefore, the dimensions are 2/∛7 and ∛14
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Complete Question
You are constructing a box for your cat to sleep in. The plush material for the square bottom of the box costs 7 dollars per square foot and the material for the sides costs 4 dollars per square foot. You need a box with a volume of 4 ft³. Use x to represent the length of the square base, and use h to represent the height of the box.
(a) Determine a formula for the height h in terms of x.
(b) Determine a formula for the total cost C(x) of the materials for the box.
(c) Find the dimensions (in ft) of the box that minimize cost. (length of base and height)
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the sides of a square are dilated by a scale factor of 1/2. the perimeter of the bigger square is 24 ft. what is the perimeter of the smaller square? A. 48 feet B. 12 feet C. 8 feet D. 4 feet
The perimeter of the smaller square would be = 12feet. That is option B.
What is perimeter?Perimeter can be defined as the summation of all the sides and edges of an object.
Scale factor is also defined as the ratio of difference between an original object and a newly formed object.
A square has four sides and it's perimeter = 24 ft
This means that the sides of the square= 24/4 = 6ft.
If the original (smaller square) dialted by a factor of 1/2 to have 6 ft as its sides, it means that it's original side of the small square is 3ft.
This is because to form the bigger square, 1/2 × 6 = 3ft.
Therefore, the perimeter of small square = 3+3+3+3 = 12ft.
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The residents of a city voted on whether to raise property taxes. The ratio of yes votes to no votes was 2 to 3. If there were 4335 total votes, how many yes
votes were there?
Answer: The number of no votes is 1876 votes.
What is the ratio?
"The ratio is a term that is used to compare two or more numbers. It is used to indicate how big or small a quantity is when compared to another".
For the given situation,
Let x be the number of votes.
The ratio of yes votes : no votes = 3x:2x
Total = 5x
Total votes = 4690 votes
⇒
Divide by 5 on both sides,
⇒
Thus the number of no votes =
⇒
⇒
Hence we can conclude that the number of no votes is 1876 votes.
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Step-by-step explanation:
Find the nth term of this quadratic sequence
4, 9, 16, 25, 36, ..
The nth term of this quadratic sequence 4,9,16,25,36 is [tex]n^{2} + 2n + 1[/tex]
Given that:
the given sequence is 4,9,16,25,36
nth term of quadratic sequence is [tex]an^{2}+bn+c[/tex]
Now lets find out the value of each variable a,b,c
a = second difference divide by 2
lets find out second difference
4,9,16,25,36
the first difference between the terms are
5,7,9,11
The second difference between the terms
2,2,2
the value of a = second difference / 2
[tex]a = \frac{2}{2} = 1\\[/tex]
a = 1
Now we find the value of b
3a + b = first term of first difference
3a + b = 5
3(1) + b = 5
3 + b = 5
b = 5 - 3
b = 2
Now find the value of c
a + b + c = first term
a + b + c = 4
1 + 2 + c = 4
3 + c = 4
c = 1
Now we replace all the values to find the nth term
[tex]an^{2}+bn+c\\ \\n^{2}+2n+1[/tex]
Hence the answer is the nth term of this quadratic sequence 4,9,16,25,36 is [tex]n^{2} + 2n + 1[/tex].
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Answer:
tan 25° = b / 8 m
Step-by-step explanation:
You need to know what the ratios are.
sin X = opp/hyp
cos X = adj/opp
tan X = opp/adj
For angle B, the opposite leg is b, ad the adjacent leg is 8 m.
The hypotenuse is AB.
sin B = sin 25° = opp/hyp = b/AB
tan B = tan 25° = opp/adj = b / 8 m