Given the ratio of CD:DE:EF as 1:6:3 and CF as 20, we can use the sum of segment lengths equation to find the length of EF to be 12 units.
We're given that points C, D, E, and F lie on the same line segment in that order, with the ratio CD:DE:EF equal to 1:6:3. This means that the length of segment CD is 1x, the length of segment DE is 6x, and the length of segment EF is 3x, for some common factor x.
We're also given that CF (the total length of the segment from C to F) is equal to 20. So that we can set an equation:
CD + DE + EF = CF
Substituting the values we know from the ratio and CF:
1x + 6x + 3x = 20
Combining like terms:
10x = 20
Solving for x:
x = 2
Now we can use this value of x to find the lengths of each segment:
CD = 1x = 1(2) = 2
DE = 6x = 6(2) = 12
EF = 3x = 3(2) = 6
So the length of segment EF is 12 units.
Learn more about segment here:
https://brainly.com/question/12622418
#SPJ4
You select a sample of 20 kids in the Valley Kindergarten and observe that their ages are
9; 9.5; 9.5; 10; 10; 10; 10; 10.5; 10.5; 10.5; 10.5; 11; 11; 11; 11; 11; 11; 11,5; 11,5; 11.5
Find the sample standard deviation of the age distribution in the Wenatchee Valley Kindergarten.
Solution. Please write your detailed solution here:
Standard deviation of the following data is 0.655.
What is standard deviation?The standard deviation is equal to the variance's positive square root. It is a fundamental statistical analysis method. The amount by which data values deviate from the mean is referred to as "standard deviation," or "SD."
Whereas a big standard deviation implies that the values are much outside the mean, a low standard deviation shows that the values are frequently only a few standard deviations from the mean.
Here in the question,
Total kids = 20.
Mean = 9+9.5+9.5+10+10+10+10+10.5+10.5+10.5+10.5+11+11+11+11+11+11+11.5+11.5+11.5/20
= 10.52
Now square of distance between mean and ages.
(9-10.52) ² = 2.31
(9.5-10.52) ² = 1.04
(10-10.52) ² = 0.27
(10.5-10.52) ² = 0.0004
(11-10.52) ² = 0.23
(11.5-10.52) ² = 0.96
Now sum of all the differences = 2.31 + 1.04 + 1.04 + 4×0.27 + 4× 0.0004 + 6× 0.23+ 3×0.96
= 8.73
Now standard deviation = √8.73/20
= √0.43
= 0.655
To know more about standard deviation, visit:
https://brainly.com/question/23907081
#SPJ1
Between 1989 and 1998, the population of Smalltown, USA (in thousands) can be modeled by I(x) = 0.34x2 - 4.08x + 16.2, where x = 0 represents 1989. Bassed on this model, in what
year did the population of Smalltown reach its minimum?
Using functions, we can find that the population of Smalltown reached its minimum in year 1995.
Define function?Functions are the central idea of calculus in mathematics. The functions are special types of relations. A function is a rule that generates a unique outcome for each input x in mathematics.
A mapping or transformation in mathematics represents a function.
The minimum point of this function corresponds to the vertex of the upward-opening parabola it creates.
You must consider the sign of the coefficient of the quadratic term, "a," in order to calculate the direction of the parabola without graphing it.
The parabola widens if the value of "a" is positive.
The parabola begins at the bottom if "a" is negative.
Now, you must use the following formula to find the x-coordinate of the vertex of a quadratic function represented in standard form:
x = -b/2a
a = 0.34
b = -4.08
x = -(-4.08)/2 × 0.34
= 4.08/0.68
= 6
Now, f (6) = 0.34 × 6² - 4.08 × 6 + 16.2
= 12.24 - 24.48 + 16.2
= 3.96
≈ 4
So, coordinates of the vertices are: (6,4)
If x = 0 is year 1989
Then, x = 6 is year 1989 + 6 = 1995.
This means that the population of Smalltown reached its minimum in year 1995.
To know more about functions, visit:
https://brainly.com/question/12431044
#SPJ1
i need this answer for my hw please help me
In order for ΔCAM≅ΔCOM to be proved, all three sides and all three angles must be equal. So the correct answer is E. ΔCAM≅ΔCOM.
What is corresponding sides?Corresponding sides are two sides in a polygon that are directly across from each other. This can be seen when two sides are connected by a line that is perpendicular to the other two sides.
ΔCAM≅ΔCOM can be proved when the two triangles have three corresponding sides and three corresponding angles that are equal.
However, option E does not provide proof of this as it only states that two angles are equal.
The other four options provide such proof.
Option A states that two angles are equal, Option B states two lines are equal and two angles are equal, Option C states two lines are equal and two angles are equal, and Option D states two lines are equal and two lines are equal. All of these provide the proof that ΔCAM≅ΔCOM.
For more questions related to polygon
https://brainly.com/question/1592456
#SPJ1
In order for ΔCAM≅ΔCOM to be proved, all three sides and all three angles must be equal. Option E does not provide proof of this as it only states that two angles are equal. So the correct answer is E. ΔCAM≅ΔCOM.
What is corresponding sides?Corresponding sides are two sides in a polygon that are directly across from each other. This can be seen when two sides are connected by a line that is perpendicular to the other two sides.
ΔCAM≅ΔCOM can be proved when the two triangles have three corresponding sides and three corresponding angles that are equal.
However, option E does not provide proof of this as it only states that two angles are equal.
The other four options provide such proof.
Option A states that two angles are equal,
Option B states two lines are equal and two angles are equal,
Option C states two lines are equal and two angles are equal, and Option D states two lines are equal and two lines are equal.
All of these provide the proof that ΔCAM≅ΔCOM.
For more questions related to polygon
https://brainly.com/question/1592456
#SPJ1
(-77.92) + (-8.39) + 59.4 - (-91.77)
Answer:
64.86
Step-by-step explanation:
Given: (-77.92) + (-8.39) + 59.4 - (-91.77)
The + and - will become -, and the - and - will become +:
-77.92 - 8.39 + 59.4 + 91.77
Finally, calculate:
-86.31 + 151.17
= 64.86
The solid edges below form the triangle. The dashed lines are just there to help us find the height.
Area inside the solid lines=
Answer: 96 in squared.
First find the area of the whole triangle:
= 1/2(24+6)(8)
= 1/2(30)(8)
= 120
Then, find the area of the triangle formed by dotted lines:
= 1/2(6)(8)
= 24
Subtract the two areas:
= 120 - 24
= 96
Brown paint can be made by mixing green and red paint in a 3 : 4 ratio. What fraction of the brown paint is green paint? Give your answer in its simplest form.
Answer:
3/7
Step-by-step explanation:
What is a ratio?A ratio has two or more numbers that symbolize relation to each other. Ratios are used to compare numbers, and you can compare them using division.
Let’s assume that we have 7 units of paint in total. Then, we have 3 units of green paint and 4 units of red paint. When we mix them together, we get 7 units of brown paint.
Because 3 out of the 7 units of paint are green, the fraction of the brown paint that is green paint is [tex]\frac{3}{7}[/tex].
Therefore, [tex]\frac{3}{7}[/tex] of the brown paint is green.
please show with working out
According to the information, each of the cases of equations has a different solution depending on the value that is given to the unknown or x.
How to explain each equation case?Let p = √(x - 3), then the equation becomes p^2 - 2p - 3 = 0. This is a quadratic equation that can be factored as (p - 3)(p + 1) = 0. Therefore, p = 3 or p = -1. Since p = √(x - 3) and we want real solutions, we have two cases:
Case 1: p = √(x - 3) = 3. Squaring both sides, we get x - 3 = 9, so x = 12.
Case 2: p = √(x - 3) = -1. This case gives no real solution, since the square root of a real number cannot be negative. Therefore, the only real solution is x = 12.
Let p = √(x - 5), then the equation becomes p^2 - 4p - 12 = 0. This is a quadratic equation that can be factored as (p - 6)(p + 2) = 0. Therefore, p = 6 or p = -2. Since p = √(x - 5) and we want a real solution, we have only one case:
Case 1: p = √(x - 5) = 6. Squaring both sides, we get x - 5 = 36, so x = 41. However, we need to check that this solution is valid. Since p = √(x - 5) = 6 > 0, we have x - 5 > 0, so x > 5. Therefore, the only real solution is x = 41.
Let p = 3^x, then the equation becomes p^2 + 11p - 12 = 0. This is a quadratic equation that can be factored as (p + 12)(p - 1) = 0. Therefore, p = -12 or p = 1. Since p = 3^x and we want a real solution, we have only one case:
Case 1: p = 3^x = 1. This gives x = 0. However, we need to check that this solution is valid. Since 3^x > 0 for all x, we have x > -∞. Therefore, the only real solution is x = 0.
There is only one real solution because the function 9^x + (11x3^x) - 12 is continuous and strictly increasing for all x, which means that it can cross the x-axis at most once. Since we have found one real solution, there cannot be any others.
Learn more about equations in: https://brainly.com/question/29657983
#SPJ1
Kayla developed a study to determine the populations of fish in
a lake. She took two random samples in the winter and again in
the summer. She organized her data in the following table. What valid inference can Kayla make about the entire fish population in the pond. Select all that apply.(There are two correct answers)
Answer:
7.81 units
Step-by-step explanation:
To find the distance between two points, we can use the distance formula:
d = √((x2 - x1)^2 + (y2 - y1)^2)
where (x1, y1) and (x2, y2) are the coordinates of the two points.
Using the coordinates given in the problem, we can plug in the values into the formula:
d = √((4 - (-2))^2 + (1 - (-4))^2)
Simplifying this expression, we get:
d = √((6)^2 + (5)^2)
d = √(36 + 25)
d = √61
Therefore, the distance between the two points (-2,-4) and (4,1) is √61 (square root of 61), which is approximately 7.81 units.
April has a sheet of paper that is 4 feet long. She cuts the length of paper into halves and then cuts the length of each of these 1 2 pieces into thirds. How many pieces does she have? How many inches long is each piece? April has pieces. Each piece is inches long
April has six pieces of paper, each measuring 8 inches in length which can be calculated using fractions.
April starts with a sheet of paper that is 4 feet long, which is equivalent to 48 inches since there are 12 inches in a foot. She then cuts the length of paper into halves, which gives her two pieces, each of them 24 inches long.
Next, she cuts the length of each of these 24-inch pieces into thirds, which gives her six pieces in total. Each of these pieces is 8 inches long, since 24 divided by 3 equals 8. Therefore, April has six pieces of paper, and each piece is 8 inches long.
It's worth noting that April's process of cutting the paper into halves and then into thirds is an example of how fractions can be used to divide a whole into equal parts. In this case, cutting the paper into halves means dividing it into two equal parts, and cutting each of these halves into thirds means dividing each half into three equal parts.
Overall, April has six pieces of paper, each measuring 8 inches in length. These pieces could be useful for various purposes, such as for creating small origami figures, for making decorations, or for use in a crafting project.
Learn more about length here:
https://brainly.com/question/30100801
#SPJ4
Please help me! LIKE RNWWW. I HAVE BEEN WAITING AND NO ONE HAS BEEN HELPING. THIS IS DUE AT 2:15 PM!!!! IN TWO MINSSS!!!!! A game has 15 balls for each of the letters B, I, N, G, O. The table shows the results of drawing balls 1,250 times.
Letter Frequency
B 247
I 272
N 238
G 241
O 252
For which letter is the experimental probability closest to the theoretical probability? Explain please.
The letter O has the experimental probability that is closest to its theoretical probability.
Define the term probability?Probability is an area of statistics that deals with the study of random events and their likelihood of occurrence.
The theoretical probability of drawing a particular letter is the number of balls of that letter divided by the total number of balls in the game. For each letter, the theoretical probability is:
B: 15/75 = 0.2
I: 15/75 = 0.2
N: 15/75 = 0.2
G: 15/75 = 0.2
O: 15/75 = 0.2
The experimental probability of drawing a particular letter is the number of times that letter was actually drawn divided by the total number of draws. For each letter, the experimental probability is:
B: 247/1250 = 0.1976
I: 272/1250 = 0.2176
N: 238/1250 = 0.1904
G: 241/1250 = 0.1928
O: 252/1250 = 0.2016
Compare the differences between the theoretical and experimental probabilities for each letter. The letter with the smallest difference is the one whose experimental probability is closest to its theoretical probability.
Here, the differences between the theoretical and experimental probabilities for each letter are:
B: 0.2 - 0.1976 = 0.0024
I: 0.2 - 0.2176 = 0.0176
N: 0.2 - 0.1904 = 0.0096
G: 0.2 - 0.1928 = 0.0072
O: 0.2 - 0.2016 = 0.0016
Based on these calculations, we can see that the letter O has the smallest difference between its theoretical and experimental probabilities, with a difference of only 0.0016.
Therefore, the letter O has the experimental probability that is closest to its theoretical probability.
To know more about probability, visit:
https://brainly.com/question/13604758
#SPJ1
Please help me, this question is so hard
The shaded portion of the rectangle is approximately 21.8% of the rectangle, rounded to the nearest 10th.
Describe Rectangle?In geometry, a rectangle is a four-sided polygon with four right angles (90-degree angles) and opposite sides that are parallel and congruent to each other. It is a special case of a parallelogram in which all angles are right angles.
The properties of a rectangle include:
Opposite sides are parallel and congruent.
All angles are right angles.
Diagonals are congruent and bisect each other.
The area of a rectangle is given by the formula A = lw, where l is the length and w is the width.
The perimeter of a rectangle is given by the formula P = 2l + 2w.
To solve this problem, we first need to find the areas of the shaded regions and the rectangle:
Area of rectangle = l × w = 26 × 16 = 416
Area of circle = (π × (d/2)²)/4 = (π × 4²)/4 = π
Area of pentagon = (5/2) × r² × sin(72°) = (5/2) × 5.5² × sin(72°) = 51.3
Area of right-angled triangle = (1/2) × h × d = (1/2) × 8 × 8 = 32
Total area of shaded region = Area of circle + Area of pentagon + Area of right-angled triangle = π + 51.3 + 32 ≈ 90.8
To find the percentage of the rectangle that is shaded, we divide the area of the shaded region by the area of the rectangle and multiply by 100:
Percentage of shaded region = (90.8/416) × 100 ≈ 21.8%
Therefore, the shaded portion of the rectangle is approximately 21.8% of the rectangle, rounded to the nearest 10th.
To know more about area visit:
https://brainly.com/question/19393352
#SPJ1
What is the image point of (−1,1) after a translation right 2 units and down 1 unit?(Exlain+rules)
Monique has 4 pencils for every 2 pens in her backpack. If she has 6 pencils, how many pens does she have? If pens are the X variable and pencils are the Y variable, plot this relationship as a point in the coordinate plane.
Answer: 3 pens
Step-by-step explanation: The ratio of pencils to pens Monique has is 2:1, this means that for every 2 pencils Monique has she will have 1 pen. To plot this on a graph you can put one point at (2,1) and another point at (4,2)
in 2001, the population of a district was 26,100. with a continuous annual growth rate of approximately 4%, what will the population be in 2026 according to the exponential growth function?
The population in 2026 according to the exponential growth function will be approximately 54,515.
According to the exponential growth function, what will be the population in 2026 if in 2001 the population of a district was 26,100 and with a continuous annual growth rate of approximately 4%?Given,
The population in 2001 = 26,100
Annual growth rate = 4%
Population growth function can be written as,
[tex]P(t) = P0e^rt[/tex]
Where,P(t) = Population after t years
P0 = Population at time t = 0
r = Annual growth rate (in decimal form)
t = Time (in years)
According to the given question,In the year 2026, the number of years from 2001 is,2026 – 2001 = 25 years
Therefore,t = 25 years
r = 4% = 0.04
Using these values in the population growth function,
[tex]P(t) = P0e^rt[/tex]
Population in 2026 = P(25)
[tex]P(25) = 26,100e^(0.04 x 25)[/tex]
P(25) = 26,100e
P(25) ≈ 54,515
for such more question on Population
https://brainly.com/question/25896797
#SPJ11
what is the value of u?
Answer:26
Step-by-step explanation:
The pentagons JKLMN and PQRST are similar.
Find the length x of RS.
The length of the segment SR for the given pentagons is 9 units.
What is a pentagon?A polygon having 5 sides and 5 angles is called a pentagon. The words "pentagon" (which implies five angles) are formed up of two other terms, namely Penta and Gonia. End to end, the sides of a pentagon come together to form a shape. Hence, there are 5 sides in a pentagon.
The pentagon is a polygon with five sides and five angles, just like other polygons including triangles, quadrilaterals, squares, and rectangles. There are several sorts of pentagon forms, including regular and irregular pentagons as well as convex and concave pentagons, depending on the sides, angles, and vertices.
We know that, for similar figures the length of the ratios of their corresponding segments are equal.
Thus,
NM/TS = ML/SR
4/7.2 = 5/x
Using cross multiplication we have:
4x = 5(7.2)
4x = 36
x = 9
Hence, the value of the segment SR for the given pentagons is 9 units.
Learn more about pentagon here:
https://brainly.com/question/17054992
#SPJ1
Consider the inequality −2.45x+9.3>2.44
What is the answer?
Answer: the answer is x < 2.80
Step-by-step explanation: can i get brainliest pls
is -2/3 less than or greater than -5/2?????????/
Answer:
Greater than
Step-by-step explanation:
With negative numbers the smaller it is, the more its worth. (If that makes sense) -2 is MUCH bigger than -500
:)
Chase throws a football in the air. The height of the football t seconds after it is thrown can be modeled by h(t)=-16t(t-2)^2+40. What is the maximum height of the ball? When does it reach this height?
a bowl contains 7 7 red balls and 8 8 blue balls. a woman selects 4 balls at random from the bowl. how many different selections are possible if at least 3 balls must be blue?
If at least 3 of 4 balls must be blue then the number of possible selections = 462
Let us assume that m represents the number of red balls in a bowl.
So, m = 7
And n represents the number of blue balls in a bowl.
So, n = 8
A woman selects 4 balls at random from the bowl.
We need to find the number of possible selections if at least 3 balls must be blue.
The first combination would be 4 blue balls + 0 red balls
And the second combination would be 3 blue balls + 1 red ball
so, using combination formula the number of possible selecctions:
(⁸C₄ × ⁷C₀) + (⁸C₃ × ⁷C₁)
= (70 × 1) +(56 × 7)
= 462
Therefore, the number of possible selections: 462
Learn more about combination here:
https://brainly.com/question/28720645
#SPJ4
I messed this up please help me out with explanation
Answer:
(B) one
Step-by-step explanation:
You want to know how many points on the interval [0, 5] the function f(x) = e^(2x) have a slope equal to the average slope.
Rate of changeThe instantaneous rate of change of function f(x) is its derivative:
f'(x) = 2e^(2x)
This is a continuously increasing function (as is f(x)), so in any given interval there will be only one point that has any given slope.
The Mean Value Theorem says there is at least one point in the interval with the same slope as the average slope. The nature of the derivative tells you there is exactly one point with the same slope as the average slope.
WhereThe average rate of change on [0, 5] is ...
AROC = (e^(2·5) -e^(2·0))/(5 -0) = (e^10 -1)/5
The instantaneous rate of change will have that value where ...
f'(x) = 2e^(2x) = (e^10 -1)/5
2x = ln((e^10 -1)/10)
x = ln((e^10 -1)/10)/2 ≈ 3.84868475302
For this value of x, f'(x) = AROC
A weather station on the top of a mountain reports that the temperature is currently oc and has been falling at a constant rate of 3c per hour.if it continues to fall at this rate find each indicated temperature explain or show your reasoning
Therefore , the solution of the given problem of unitary method comes out to be the temperature will continue to drop at a rate of 3°C per hour, meaning that it will be 3°C colder .
What is a unitary method?The task may be completed using this generally accepted ease, preexisting variables, as well as any significant components from the original Diocesan customizable query. If so, you may have another opportunity to interact with the item. Otherwise, all significant factors that affect how algorithmic factor proof behaves will be gone.
Here,
=> T = -3t + 0
We need only change the value of t in the equation and simplify to determine the temperature at a particular moment.
For instance:
T equals 1 after one hour:
=> T = -3(1) + 0 T = -3
So, the weather is -3°C after an hour.
T equals 2 after two hours:
=> T = -3(2) + 0 T = -6
Thus, the temperature is -6°C after two hours.
T equals 3 after three hours:
=> T = -3(3) + 0 T = -9
So, the weather is -9°C after three hours.
so forth,
As a result, the temperature will continue to drop at a rate of 3°C per hour, meaning that it will be 3°C colder after each hour than it was the hour before.
To know more about unitary method visit:
https://brainly.com/question/28276953
#SPJ1
our local maternity ward delivers 1,500 babies per year. on the average, 5 beds in the maternity ward are filled. how long does the average mother stay in the maternity ward?
The average mother stays in the maternity ward when local maternity ward delivers 1,500 babies per year is equal to 1.22 days.
Total number of babies delivered by maternity ward per year = 1,500
⇒ Total number of patients = 1,500
On average number of beds filled in the maternity ward at any given time = 5
Total patient days per year is,
⇒ Total patient days = Average number of beds filled x Number of days in a year
Since there are 365 days in a year,
⇒Total patient days = 5 x 365
= 1,825
Use the formula,
Average length of stay = Total patient days / Total number of patients
⇒Average length of stay = 1,825 / 1,500
⇒Average length of stay = 1.22 days
Therefore, the average mother stays in the maternity ward for 1.22 days.
Learn more about average here
brainly.com/question/28948528
#SPJ4
david has real 18 pages more than 1/4 pages of a book. write an expressions to represents the p pages david has read.
The expression to represent the p pages David has read is: p = 18 + (1/4)x, where x is the total number of pages in the book.
David has read 18 pages more than 1/4 pages of a book. The expression to represent the p pages that David has read would be: p = 18 + (1/4)x, where x is the total number of pages in the book. The reasoning behind this is as follows:
David has already read 18 pages more than 1/4 of the book, so we have to add 18 pages to whatever the pages of the book are. Since we don't know what the actual number of pages are, we'll call that x. Therefore, David read 1/4 of the book (or 1/4 of x) plus 18 pages.
Hence, the expression is: p = 18 + (1/4)x.
To learn more about expressions visit : https://brainly.com/question/4344214
#SPJ11
Find the surface area of the composite figure. 2 in. 4 in. 10 in. SA 4 in. 2 in. 4 in. 7 in. 4 in. = = [?] in.2 Sea FATEM 37049077 PED If you'd like, you can use a calculator. Enter
The surface area of the composite figure is; SA = 224 in.²
How to find the area of a Composite Figure?From the composite figure attached, we can find the surface area of each of the rectangular/square external face seen as:
[tex]SA= 2(10 \times 2) + 2(4 \times 7) + 2(4 \times 4) + 2(4 \times 2) + (4 \times 7) + (10 \times 4) + (3 \times 4)[/tex]
[tex]SA = 40 + 56 + 32 + 16 + 28 + 40 + 12[/tex]
[tex]SA = 224 \ \text{in}.^2[/tex]
Thus, we can conclude that the surface area of the composite figure is:
[tex]SA = 224 \ \text{in}.^2[/tex]
Pls help!! I NEED IT BADLYYY ILL GIVE BRAINIEST!!
Additionally, please note that offering a "brainiest" reward for assistance is not necessary.
Hello! I'd be happy to help you with your question, but please refrain from using excessive capitalization or urgency in your request. It can come across as rude and disrespectful to others who are also seeking assistance.
Regarding your question, I'll do my best to answer it to the best of my abilities. However, I need you to provide me with more details on what specifically you need help with. Without this information, it's difficult for me to provide you with an accurate answer.
Our goal is to provide helpful and informative responses to all users, regardless of any potential rewards.
Thank you for reaching out, and I look forward to hearing back from you with more information on your question.
To learn more about : brainiest
https://brainly.com/question/29660858
#SPJ11
please answer soon!!!!!!!
Answer:
i believe its D
im sorry if i am incorrect
Answer:
D is the answer
Step-by-step explanation:
Teacher said K=144, but I'm not sure how to solve from here. Please explain!
Answer:
144
Step-by-step explanation:
The angles on the line next to the big c must add up to 180, and 180-58=122, so the space next to the 58 must be 122
The interior angles of a polygon can be calculated with 180(n-2) where n is the sides, so a pentagon has 540 degrees of interior angles
540 - 96 - 88 - 90 - 122 = 144
Answer:
Step-by-step explanation:
90+96+88+180-58=540-k
k=540-396
k = 144
marketing companies have collected data implying that teenage girls use more ring tones on their cellular phones than teenage boys do. in one particular study of 40 randomly chosen teenage girls and boys (20 of each) with cellular phones, the mean number of ring tones for the girls was 3.3 with a standard deviation of 1.6. the mean for the boys was 1.6 with a standard deviation of 0.7. conduct a hypothesis test at the 5% significance level to determine if the girls' mean is higher than the boys' mean.
Conducting a hypothesis test at the 5% significance level we can conclude that the girls' mean is higher than the boys' mean.
To conduct a hypothesis test to determine if the girls' mean is higher than the boys' mean, you will need to use a two-tailed hypothesis test with a significance level of 5%. The null hypothesis is that the girls' mean is not higher than the boys' mean, and the alternative hypothesis is that the girls' mean is higher than the boys' mean. The test statistic is calculated using the formula:
Test statistic = (Girls' mean - Boys' mean) / (Standard deviation of the difference / √(sample size))
The test statistic for this study is calculated as: (3.3 - 1.6) / (1.6/√40) = 4.375.
Using a 5% significance level and two-tailed hypothesis test, the critical value for this test is 1.96. Since the test statistic (4.375) is greater than the critical value (1.96), the null hypothesis can be rejected.
Therefore, we can conclude that the girls' mean is higher than the boys' mean.
Know more about hypothesis test here:
https://brainly.com/question/4232174
#SPJ11
Will give you brainliest answer
Enlarge shape A by scale factor 2 with centre of enlargement (-3, -5).
What are the coordinates of the vertices of the image?
The coordinates of the vertices of the enlarged shape A are (3, -3), (7, -3), (1, -6), and (0, -6).
What do you mean by scale factor?In mathematics and geometry, a scale factor is a numerical factor that describes how much a figure or object has been enlarged or reduced in size. It is the ratio of any two corresponding lengths in the original figure and the scaled figure.
What is vertices?In geometry, a vertex (plural vertices) is a point where two or more line segments, lines, or rays meet to form an angle. In other words, a vertex is a point where two or more edges of a polygon, polyhedron, or any other geometrical shape meet.
In the given question,
To enlarge the shape A by a scale factor of 2 with a centre of enlargement of (-3, -5), we need to:
Translate the centre of enlargement to the origin (0, 0) by adding 3 to the x-coordinates and 5 to the y-coordinates of all points.
Apply the enlargement by multiplying the coordinates of each point by 2.
Translate the centre of enlargement back to its original position by subtracting 3 from the x-coordinates and 5 from the y-coordinates of all points.
So, the coordinates of the vertices of the enlarged shape A are:
Vertex 1:
Original coordinates: (0, -4)
Translate to origin: (3, 1)
Enlarge: (6, 2)
Translate back: (3, -3)
Final coordinates: (3, -3)
Vertex 2:
Original coordinates: (2, -4)
Translate to origin: (5, 1)
Enlarge: (10, 2)
Translate back: (7, -3)
Final coordinates: (7, -3)
Vertex 3:
Original coordinates: (1, -6)
Translate to origin: (4, -1)
Enlarge: (8, -2)
Translate back: (1, -6)
Final coordinates: (1, -6)
Vertex 4:
Original coordinates: (0, -6)
Translate to origin: (3, -1)
Enlarge: (6, -2)
Translate back: (0, -6)
Final coordinates: (0, -6)
Therefore, the coordinates of the vertices of the enlarged shape A are (3, -3), (7, -3), (1, -6), and (0, -6).
To know more about scale factor,
https://brainly.com/question/30215119
#SPJ1