a. For the conversion, the chief should multiply 8 by 5,280 to convert the 8 miles to feet. The Option C is correct
b. It will take the crew 440 minutes to paint 8 miles.
How can the crew chief convert 8 miles to feet?One mile is equal to 5280 feet. So, to convert our miles to feet, we need to multiply the length or distance in miles times 5280.
To convert miles to feet, the chief should multiply number of miles by the conversion factor of 5,280 feet per mile.
The measurement in feet will be:
= 8 miles * 5,280 feet/mile
= 42,240 feet.
B. If the crew can paint 96 feet in one minute, we will use unit rate of feet per minute to determine how long it will take to paint 42,240 feet which is:
= 42,240 feet /96 feet
= 440 minutes.
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what are the two assumptions that must be met in order to construct a confidence interval for (population mean) when (population standard deviation) is known?
In order to construct a confidence interval for the population mean when the population standard deviation is known, two assumptions must be met. Firstly, the sample data must be a simple random sample from the population being studied.
Secondly, the variable being measured must have a normal distribution or the sample size must be sufficiently large. The first assumption of a simple random sample ensures that the sample is representative of the population being studied, which is necessary for valid statistical inference. The second assumption is necessary because the confidence interval calculation relies on the assumption that the sample mean follows a normal distribution. When the variable being measured has a normal distribution, the sample mean will also have a normal distribution regardless of the sample size. When the variable being measured does not have a normal distribution, the sample size must be large enough (typically at least 30) in order for the sample mean to follow a normal distribution due to the central limit theorem. By meeting these two assumptions, we can be confident in the accuracy of the resulting confidence interval for the population mean.
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lucy and zaki each throw a ball at a target. what is the probability that both lucy and zaki miss the target?
The probability that both Lucy and Zaki miss the target is 1/4, or 0.25.
Let's say that the probability of Lucy missing the target is P(L) and the probability of Zaki missing the target is P(Z). Then, the probability that both of them miss the target is:
P(L and Z) = P(L) x P(Z)
This is thus because the likelihood that two separate occurrences will occur simultaneously is the product of their respective probabilities.
If we assume that Lucy and Zaki are equally skilled at throwing the ball and have the same chance of missing the target, then we can say:
P(L) = P(Z) = 1/2
So, the probability that both Lucy and Zaki miss the target is:
P(L and Z) = P(L) x P(Z)
= (1/2) x (1/2)
= 1/4
Therefore, the probability that both Lucy and Zaki miss the target is 1/4, or 0.25.
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5. Which set of side lengths can be used to form a right triangle?
A. 11, 16, 20
B. 8, 15, 17
C. 6,8,9
D. 6, 15, 17
Answer:
B
Step-by-step explanation:
using the converse of Pythagoras' identity
if the longest of the 3 sides is equal to the sum of the squares on the other 2 sides then the triangle is right.
A
longest = 20 → 20² = 400
11² + 16² = 121 + 256 = 377
400 ≠ 377 , so triangle is not right
B
longest = 17 → 17² = 289
8² + 15² = 64 + 225 = 289
then this triangle is right
C
longest = 9 → 9² = 81
6² + 8² = 36 + 64 = 100
81 ≠ 100 , so this triangle is not right
D
longest = 17 → 17² = 289
6² + 15² = 36 + 225 = 261
289 ≠ 261 , so this triangle is not right
a bag contains 100 equally-sized papers with names of juniors and seniors. you have been told that 40% of the names in the bag are juniors. you reach in and without looking , pick 10 pieces of paper without replacement. we want to usesimulkation toestimate the probability that exactly 4 of the 10 are juniors. describe the design of simulation to estimate this probability
Simulate the process of drawing 10 papers from the bag repeatedly, and count the number of times exactly 4 of the 10 papers are juniors. Divide the count by the total number of simulations to estimate the probability.
To implement the simulation, we can write a program that randomly generates 10 papers from the bag based on the known proportion of juniors and seniors. We can repeat this process for a large number of times, such as 10,000, and count the number of times exactly 4 of the 10 papers are juniors. The estimated probability is then the count divided by the total number of simulations. We can also calculate a confidence interval for the estimate to assess the uncertainty of the simulation result.
To ensure the simulation accurately reflects the actual process, we need to make sure that the program generates the papers randomly and without replacement, and that the proportion of juniors and seniors in the bag matches the known percentage. We also need to use a large enough number of simulations to reduce the sampling error and obtain a stable estimate.
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In circle X, m/VXW = 65°. Solve for x if mVW = (10x – 50)°. If necessary, round your answer to the nearest tenth. X V W
Answer:
11.5
Step-by-step explanation:
65=10x-50
+50. +50
=115=10x
find sin A, cos A, and tan A.
2.
A
4
45°
B
Check the picture below.
[tex]\sin(A )=\cfrac{\stackrel{opposite}{2\sqrt{2}}}{\underset{hypotenuse}{4}}\implies \sin(A )=\cfrac{\sqrt{2}}{2} \\\\\\ \cos(A )=\cfrac{\stackrel{adjacent}{2\sqrt{2}}}{\underset{hypotenuse}{4}}\implies \cos(A )=\cfrac{\sqrt{2}}{2} \\\\\\ \tan(A )=\cfrac{\stackrel{opposite}{2\sqrt{2}}}{\underset{adjacent}{2\sqrt{2}}}\implies \tan(A)=1[/tex]
Write each equation in polar coordinates. Express as a function of t . Assume that r > 0 (a) y = 10 (b) x2 + y2 = 10 (c) x2 + y2 _ 6x = 0 (d) x2(x2 + y) = 10y2
In polar coordinates, the equation for (a) is r = 10sinθ, the equation for (b) is r = √10, the equation for (c) is r = 6cosθ, and the equation for (d) is r = 10sinθ / (cos^2θ - sin^2θ).
In polar coordinates, a point (r, θ) represents the distance r from the origin and the angle θ measured counterclockwise from the positive x-axis. To express each equation in polar coordinates, we can substitute x = rcosθ and y = rsinθ, then simplify using trigonometric identities and algebraic manipulations.
(a) y = 10
Substituting y = rsinθ, we get rsinθ = 10, or r = 10sinθ.
(b) x^2 + y^2 = 10
Substituting x = rcosθ and y = rsinθ, we get r^2 = 10, or r = √10.
(c) x^2 + y^2 - 6x = 0
Substituting x = rcosθ and y = rsinθ, we get r^2 - 6rcosθ = 0, or r = 6cosθ.
(d) x^2(x^2 + y) = 10y^2
Substituting x = rcosθ and y = rsinθ, we get r^2cos^2θ(r^2cos^2θ + rsinθ) = 10r^2sin^2θ, or r = 10sinθ / (cos^2θ - sin^2θ).
Therefore, in polar coordinates, the equation for (a) is r = 10sinθ, the equation for (b) is r = √10, the equation for (c) is r = 6cosθ, and the equation for (d) is r = 10sinθ / (cos^2θ - sin^2θ).
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find the general solution of the differential equation. use c1 and c2 to denote arbitrary constants. y''(t)=28e^4t sin6t
The general solution of the differential equation
y''(t) = 28e^(4t)sin(6t) is y(t) = c1e^(4t)sin(6t) + c2e^(4t)cos(6t).
To find the general solution of the differential equation
y''(t) = 28e^(4t)sin(6t), we can solve the homogeneous equation y''(t) = 0 and then find a particular solution for the non-homogeneous equation.
The homogeneous equation is y''(t) = 0, which has the general solution y(t) = c1 + c2t, where c1 and c2 are arbitrary constants.
To find a particular solution for the non-homogeneous equation, we can use the method of undetermined coefficients. Since the non-homogeneous term is of the form e^(4t)sin(6t), we can assume a particular solution of the form y_p(t) = Ate^(4t)sin(6t) + Bte^(4t)cos(6t). After taking the first and second derivatives, we can substitute them back into the original equation and solve for the coefficients A and B.
We obtain A = -7/200 and B = 3/100.
Therefore, the general solution of the differential equation
y''(t) = 28e^(4t)sin(6t) is y(t) = c1e^(4t)sin(6t) + c2e^(4t)cos(6t) - (7/200)te^(4t)sin(6t) + (3/100)te^(4t)cos(6t), where c1 and c2 are arbitrary constants.
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how many arrangements are there of all the letters aabbccdefg with no pair of consecutive letters the same?
To calculate the number of arrangements of the given letters (aabbccdefg) with no pair of consecutive letters the same, we can use the concept of permutations with restrictions.
Let's consider the letters a, b, c, d, e, f, and g as distinct elements. We need to arrange these elements in such a way that no two consecutive letters are the same.
We can start by arranging the distinct elements (a, b, c, d, e, f, g) in a line, which can be done in 7! (7 factorial) ways.
Now, we need to consider the arrangements where the same letters are together. In this case, we have two pairs of repeated letters: (a, a) and (b, b).
We can treat each pair as a single entity. So, we have 6 elements to arrange: (aabb, c, d, e, f, g).
The 6 elements can be arranged in 6! ways.
Therefore, the total number of arrangements is 7! * 6!.
Note: If the repeated letters were not together, we would have to consider more cases and the calculation would be more complex.
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HELP ASAP 100 POINTS AND BRAINLIEST IF CORRECT IF WRONG I WILL REPORT!!
Which data set has a variation, or mean absolute deviation (MAD), similar to the data set in the given plot?
Answer:c
Step-by-step explanation::Add all the absolute deviations and divide by number of swimmers. Step-by-step explanation:
If the universal set contains natural numbers that are at most 25, and A is the set of multiples of 3 that are less than 20, define each set.
U=.
A =
A'=
The defined sets are as follows:
U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10....25}
A = {3, 6, 9, 12, 15, 18}
A' = {1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 21, 22, 23, 24, 25}
How to represent sets?The universal set contains natural numbers that are at most 25. Natural numbers are counting numbers.
Therefore,
universal set = U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10....25}
A is the set of multiples of 3 that are less than 20. Therefore,
A = {3, 6, 9, 12, 15, 18}
A'(A prime) is the number that is not in the A set but is present in the universal set.
Therefore,
A' = {1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 21, 22, 23, 24, 25}
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Please help!!! I really need to get this lesson done
The probability of choosing a green tile and then a blue tile is given as follows:
1/7.
How to calculate a probability?The parameters that are needed to calculate a probability are listed as follows:
Number of desired outcomes in the context of a problem or experiment.Number of total outcomes in the context of a problem or experiment.Then the probability is then calculated as the division of the number of desired outcomes by the number of total outcomes.
For each outcome, the probabilities are given as follows:
Green tile: 2/7.Blue tile: 3/6 = 1/2.Hence the probability is given as follows:
2/7 x 1/2 = 1/7.
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Christina took out a loan of $98,500 at an interest rate of 12.6% compounded monthly. She paid off the loan in full over the course of exactly sixteen years. Assuming that Christina made the same payment every month for sixteen years, what was her monthly payment?
O $829.52
O $1,195.10
O $1,120.50
O $1.275.03
1
Colors of Marbles in a Bag
Color Number
Red 8
Blue 10
Green 22
Total 40
The table shows the number of different colors of marbles in a bag. If a marble is chosen at random from the bag, what is the probability that the marble will be blue?
30
40
22
40
18
40
10
40
Answer: 30/40
Step-by-step explanation: 10 blue marbles - 40 = 30
suppose x = 4 sec a rewrite in terms of sine and cos
We can rewrite x = 4 sec a in terms of sine and cosine as x = 4/cos(a) = 4(1/cos(a)) = 4/[(1-sin^2(a))^0.5].
To understand why we can rewrite secant as a combination of sine and cosine, we can start with the definition of the secant function. The secant of an angle a is defined as the reciprocal of the cosine of a, or sec(a) = 1/cos(a). Using the Pythagorean identity, 1 = sin^2(a) + cos^2(a), we can solve for cos(a) to get cos(a) = (1 - sin^2(a))^0.5. Substituting this into the definition of secant, we get sec(a) = 1/[(1 - sin^2(a))^0.5]. Finally, multiplying both the numerator and denominator by 4, we get x = 4/[(1 - sin^2(a))^0.5], which is the desired form of x in terms of sine and cosine.
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by how many times does the sample size have to be increased to decrease the margin of error by a factor of 1/7
To decrease the margin of error by a factor of 1/7, the sample size needs to be increased by a factor of 49.
To understand why this is the case, recall that the margin of error is a function of the sample size, the standard deviation of the population, and the confidence level. The margin of error is proportional to the inverse square root of the sample size, which means that if we want to decrease the margin of error by a factor of 1/7, we need to increase the sample size by a factor of 7.
However, increasing the sample size by a factor of 7 only decreases the margin of error by a factor of the square root of 7 (approximately 2.65). To decrease the margin of error by a factor of 1/7, we need to increase the sample size by a factor of 7 times the square of 2.65, which is approximately 49.
In other words, to decrease the margin of error by a factor of 1/7, we need to increase the sample size by a factor of 49. This means that we need to collect almost 50 times more data than we currently have in order to achieve the desired level of precision.
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mrs. smith gives a psychology test and finds that the scores form a normal distribution where the mean is 80 and the standard deviation is 12. about what percentage of mrs. smith's students scored at or above a 92%?.
Percentage of Mrs. smith's students scored at or above a 92% for given mean and standard deviation using standard normal distribution is equal to 15.87%.
Mean = 80
Standard deviation = 12
To find the percentage of Mrs. Smith's students who scored at or above a 92%,
Find the area under the normal distribution curve to the right of 92%.
Use a standard normal distribution table or a calculator ,
Find the corresponding z-score for a raw score of 92 in a normal distribution with mean 80 and standard deviation 12.
z = (92 - 80) / 12
= 1
This means that a score of 92 is one standard deviation above the mean.
From a standard normal distribution table,
Attached table.
Find that the area to the right of a z-score of 1 is approximately 0.1587.
This means that approximately 15.87% of Mrs. Smith's students scored at or above a 92%.
Therefore, about 15.87% of Mrs. Smith's students scored at or above a 92% on the psychology test using standard normal distribution .
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problem: a radio tower is located 615 feet from a building. from a window in the building, a person determines that the angle of elevation to the top of the tower is 42 degrees and that the angle of depression to the bottom of the tower is 34 degrees. how tall is the tower in exact form (in terms of the trig functions) and to the nearest integer?
The height of the tower is 969 feet.
Let CD be the tower and A be the point from a window in the building, a person determines that the angle of elevation to the top of the tower is 42 degrees.
In triangle AED
tan42° = ED/AE
tan42° = h₁/615
h₁ = tan42° × 615
= 553.74
Rounding to the nearest integer
h₁ = 554
In triangle AEC
tan34° = EC/AE
tan34° = h₂/615
h₂ = tan34° × 615
= 414.82
Rounding to the nearest integer
h₂ = 415
Height of tower = EC + ED
= h₁ + h₂
= 554 + 415
= 969
Therefore, the height of the tower is 969 feet.
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What is the value of n
In the triangle, value of n is,
n = 16
We have to given that;
In triangle KMN,
MN = 24 yards
KL = 30 yards
LM = 15 yards
Hence, By proportionality theorem we get;
⇒ MN / KM = OL / KL
⇒ 24 / 45 = n / 30
Solve for n;
⇒ 24 × 30 / 45 = n
⇒ n = 16
Thus, In the triangle, value of n is,
n = 16
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A spinner for a board-game is divided into four equal-sized sections colored red, green, yellow, and blue. If you land on a line between the colors, you keep spinning until you land on a color. Luke's turn is next. Which word or phrase describes the probability that he will land on white?
A. Unlikely
B. Certain
C. An equal chance or 50-50
D. Impossible
The words that describe probability that he will land on white is impossible. The Option D.
What is the probability that Luke will land on white?Probability is math branch that deals with finding out the likelihood of the occurrence of an event.
Here, the spinner is divided into four equal-sized sections, the probability of landing on any specific color will be:
= Either of red, green, yellow or blue / 4
= 1/4.
it is mentioned that if Luke lands on a line between the colors, he keeps spinning until he lands on a color. This means that there is no chance of landing on white directly.
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A trapezoid has bases of lengths 30 and 50. Find the trapezoid's height if it's area is 400
The height of the trapezoid is H = 10 units
Given data ,
A trapezoid has bases of lengths 30 and 50
Now , the area of the trapezoid is A = 400 units²
where Area of Trapezoid = ( ( a + b ) h ) / 2
On simplifying , we get
400 = ( 30 + 50 ) ( H ) / 2
Multiply by 2 on both sides , we get
800 = 80 H
Divide by 80 on both sides , we get
H = 10 units
Hence , the height is H = 10 units
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Given f(x) = -x² - 10x - 9, find f(-1)
Answer:
0
Step-by-step explanation:
Given
f ( x ) = - x² - 10x - 9
To find : f ( - 1 )
x = 1
f ( 1 ) = - ( - 1 )² - 10 ( - 1 ) - 9
= - 1 + 10 - 9
= 10 - 9 - 1
= 10 - 10
f ( 1 ) = 0
Find the length of the curve r=θ2from θ=0toθ=8.Use the standard arc length formula.
The length of the curve is:
[tex]=\frac{(68)^\frac{3}{2}-8 }{3}[/tex]
Arc Length:Using the arc length formula in terms of polar coordinates [tex]\int\limits\sqrt{r^2+(\frac{dr}{d\theta})^2 }[/tex]
To find the length of the curve we will use the formula:
[tex]\int\limits\sqrt{r^2+(\frac{dr}{d\theta})^2 }[/tex]
Now, Let us put it in the expression:
[tex]r = \theta^2\\\\\frac{dr}{d\thera} =2\theta[/tex]
Now the integral becomes:
[tex]=\int\limits^8_0 \sqrt{(\theta)^4+(2\theta)^2} \, d\theta\\ \\=\int\limits^8_0\theta \sqrt{(\theta)^2+4} \, d\theta\\[/tex]
Now using the substitution method:
[tex]\theta^2+4=t\\\\2\thetad\theta=dt\\\\=\int\limits\frac{\sqrt{t}dt }{2}\\ \\=\frac{t^\frac{3}{2} }{3}\\ \\=\frac{(\theta^2+4)^\frac{3}{2} }{3}[/tex]
Now, Let us plug in the values:
[tex]=\frac{(68)^\frac{3}{2}-8 }{3}[/tex]
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The vertices of triangle XYZ are X(–1, 5), Y(–1, –2), and Z(–5, –2). What is the approximate distance between vertex X and vertex Z?
Step-by-step explanation:
From distance formula
(x
2
−x
1
)+(y
2
−y
1
)+(z
2
−z
1
)
AB=
1+4+1
=
6
AC=
36+5+9
=
56
=3
6
AC
AB
=
EC
BE
⇒
3
6
6
=
EC
BE
⇒
EC
BE
=
3
1
So now we can find point E
E=(
m
1
+m
2
x
1
x
2
+m
2
m
1
),(
m
1
+m
2
m
1
y
2
+m
2
y
1
),(
m
1
m
2
m
1
z
2
+m
2
z
1
)
E=(
4
−5+6
,
4
2+3
,
4
−6−6
)=E(
4
1
,
4
5
,−3)
Now we can find distance AE
AE=
(1−
4
1
)
2
+(1−
4
5
)
2
+(−3+3)
2
AE=
16
9
+8
16
1
+0
AE=
4
3
10
What is the overall main text structure of "How Archaeologists Found the Lost City of Troy."
The overall main text structure of "How Archaeologists Found the Lost City of Troy" is best described as a description. The Option D is correct.
What is the structure of the article?This article titted "How Archaeologists Found the Lost City of Troy" is focused on providing a detailed description of how archaeologists were able to locate the ancient city of Troy.
The author uses descriptive language and provides a chronological account of the excavation process as well as detailing the various methods and techniques used by archaeologists to uncover the city's remains.
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can someone help, im stuck on this its urgent
The linear regression equation for the data is y=0.47x+23.3 and the projected test grade for a student with a homework grade of 62 is 63.
How to explain the regressionThe linear regression equation for the data is y=0.47x+23.3.
The projected test grade for a student with a homework grade of 62 is:
y = 0.47(62)+23.3
y = 63.
The correlation coefficient is r=0.78, which indicates a strong positive correlation between homework grade and test grade. This means that students who do well on their homework tend to also do well on their tests.
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What method is best for solving for X^2-8x+16=0? Factor method,square root method or Quadratic formula method. And explain why.
The best method for solving X² - 8x + 16=0 is the factor method. This is because the given quadratic equation has two identical factors.
Using the factor method, we can factorize the quadratic expression as (X-4)² =0. This can be solved easily by taking the square root of both sides, which gives us X - 4 = 0 or X = 4.
The square root method would also work in this case since the quadratic expression is a perfect square trinomial. However, it is more efficient to use the factor method since it only involves factoring and solving a linear equation, while the square root method requires taking square roots of both sides of the equation.
The quadratic formula method would also work for solving this equation, but it is more complicated and time-consuming compared to the factor method.
Therefore, the factor method is the best method for solving X²- 8x + 16=0
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find the answer to the following subtraction problem by using the left to right algorithm.4222 - 2451
To solve 4222 - 2451 using the left-to-right algorithm, we start with the thousands place and subtract 2 from 4, which gives us 2. Then we move to the hundreds place and realize that we cannot subtract 4 from 2, so we need to borrow from the thousands place.
We start by subtracting the thousands place digits, then the hundreds, the tens, and finally the ones.
Starting with the thousands place, we have:
4 - 2 = 2
So we write down 2 as the leftmost digit of the answer.
Moving to the hundreds place, we have:
2 - 4 = -2
Since we cannot subtract 4 from 2, we need to "borrow" from the thousands place. We can do this by subtracting 1 from the 2 in the thousands place, making it a 1, and adding 10 to the hundreds place, making it 12.
Now we have:
12 - 4 = 8
So we write down 8 as the second digit of the answer.
Moving to the tens place, we have:
2 - 5 = -3
Again, we need to borrow. We can subtract 1 from the 1 in the thousands place, making it 0, and add 10 to the tens place, making it 12.
Now we have:
12 - 5 = 7
So we write down 7 as the third digit of the answer.
Finally, we move to the ones place:
2 - 1 = 1
So we write down 1 as the last digit of the answer.
Putting it all together, we have:
4222 - 2451 = 1771
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A bag contains green and blue marbles. If two marbles are randomly selected from the bag, which statement best describes the complement of the event "both of the marbles are blue"? A. Both of the marbles are green. B. One or more of the marbles are blue. C. One or more of the marbles are green. D. Exactly one marble is blue and one marble is green.
The complement of the event "both of the marbles are blue" is the event "one or more of the marbles are not blue".
The complement of an event refers to all the outcomes that are not part of that event. In this case, the complement of the event "both of the marbles are blue" would include all outcomes where at least one of the marbles is not blue.
Let's analyze the given options:
A. Both of the marbles are green:
This option describes an event that is different from the complement.
It implies that both marbles are green, which is not the opposite of "both marbles are blue."
B. One or more of the marbles are blue:
This option correctly describes the complement of the event.
It includes all outcomes where at least one marble is not blue, which covers situations where one or both marbles are green.
C. One or more of the marbles are green:
This option is the same as option B.
It describes the complement of the event "both marbles are blue" accurately.
D. Exactly one marble is blue and one marble is green:
This option describes a specific outcome rather than the complement of the event.
It specifies a scenario where one marble is blue and the other is green, but it does not cover other possibilities.
Based on the analysis, the statement that best describes the complement of the event "both of the marbles are blue" is B.
One or more of the marbles are blue (or equivalently,
C. One or more of the marbles are green).
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Please please please help please
Answer:
(10,13)
Step-by-step explanation:
the distance from A to D is 8. you can see that from subtracting the x coordinates 10-2=8.
This is a square so all the sides are equal. To find C, add 8 to the Y coordinate from point B.
5+ 8 = 13
so c is at (10,13)