Answer:
x= -8
Step-by-step explanation:
Answer:
x= -8
Step-by-step explanation:
Political pollsters now make sure to conduct a percentage of their telephone interviews by calling mobile phones. This policy best addresses which potential source of bias? Some of the population may not have access to other types of phones. The survey only reaches individuals who volunteer to be interviewed. The policy helps individuals understanding the wording of survey questions. Some individuals contacted may choose to not participate.
Answer:
The answer is A
Step-by-step explanation:
Some of the population may not have access to other types of phones.
The policy of conducting a portion of surveys on mobile phones helps address the source of bias wherein some people may not have access to other types of phones. By including mobile phones, pollsters can have a more representative sample, reflecting the population more accurately. However, this does not guarantee participation or comprehension of survey questions.
Explanation:The policy of political pollsters to conduct a percentage of their telephone interviews by calling mobile phones best addresses the source of bias that some of the population may not have access to other types of phones. This is reflective of a shift in communication behaviors wherein a significant percentage of the population exclusively uses mobile phones, especially among younger and middle-aged adults. This phenomenon could lead to a selection bias if only landline numbers were used, as the respondents would likely skew toward older individuals and those who are at home more often.
By integrating mobile phones in their survey methods, the pollsters are able to get a more representative sample that more accurately reflects the entire population. For instance, random-digit-dialing is a technique that allows pollsters to include respondents who have unlisted or mobile numbers. Similarly, geographically-based screenings can be employed to avoid regional bias.
However, it is important to note that including mobile phones in the survey does not address other kinds of bias. For instance, reaching out to potential respondents does not guarantee their participation, and it does not mean that the respondents would fully understand the wording of the survey questions. It only helps in achieving a more demographically reflective sample.
Learn more about Survey Bias here:https://brainly.com/question/9369154
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A circular flower bed is 22 m in diameter and has a circular sidewalk around it that is 4 m wide. Find the area of the sidewalk in square meters. Use 3.14 for pi.
The area of the sidewalk is "blank" m to the power of 2
Plz answer will give brainiest
Answer:
Area of blank is 326.56m²
Step-by-step explanation:
For a better and pictorial understanding of this problem please see attached for your reference.
Given data
Let the flower bed be the small circle with diameter d= 22m
Radius of small circle = 22/2=11m
Let the side walk be the big circle with diameter D= 4+4+22=30m
Radius of big circle =30/2 = 15m
We know that the area of circle
A1=πr²
Hence area of flower bed
A1=3.14*11²
A1= 379.94m²
Also area of side Walk
A2= πr²
A2= 3.14*15²
A2= 706.5m²
Area of blank
A3= area of side walk - area of flower bed
A3= A2-A1
A3= 706.5-379.94
A3= 326.56m²
Answer:151
Step-by-step explanation:
Help!!!!!
Two times the quantity of seven less than one-fourth of a number is equal to four more than one-third of the number. What is the number?
Answer:
Number =108
Step-by-step explanation:
2((1/4x)-7)=(1/3x)+4
Answer:
its 108!!
2(7) -1/4x = 4+1/3x
what is 7% as a number?
Answer:
0.07
Step-by-step explanation:
Step 1: Convert into a number
7% / 100
0.07
Answer: 0.07
HELP!!!! Need help with this!!
Answer:
11/14
Step-by-step explanation:
Their sum is 180 degrees. You set up an equation and get:
10x + 30 + 18x + 128 = 180
Combine Like Terms
28x + 158 = 180
28x = 22
x = 11/14
Which of the following is equivalent to x3−5x2−26x+120?
A x+4)(x2−6x+30)
B (x+3)(x2−8x+40)
C (x+6)(x2−4x+20)
D (x+5)(x2−10x+24)
Please help!
Answer:
D.
Step-by-step explanation:
James is interested in the relationship between weather conditions and whether the downtown train runs on time. For a year, James records the weather each day as well as whether this train arrives on time or is delayed. Here are his results:
Weather condition On-time Delayed Total
Sunny 167167167 333 170170170
Cloudy 115115115 555 120120120
Rainy 404040 151515 555555
Snowy 888 121212 202020
Total 330330330 353535 365365365
Find the marginal distribution of arrival status in percentages.
Round to the nearest whole percent.
On-time:
\%%percent
Delayed:
\%%percent
Stuck?Use a hint.
Using proportions, it is found that the marginal distribution is:
90% of the flights were on time.10% of the flights were delayed.---------------------------
In total, there were 170 + 120 + 55 + 20 = 365 flights.Of those, 167 + 115 + 40 + 8 = 330 on time. The percentage on time is:[tex]P = \frac{330}{365} \times 100\% = 90\%[/tex]
90% on time, and the rest, that is, 100% - 90% = 10% were delayed, and the marginal distribution is described by these percentages.A similar problem is given at https://brainly.com/question/24372153
The marginal distribution of train arrival status shows that approximately 90% of the time the train is on-time and 10% of the time it is delayed. This is calculated by taking the frequency of each arrival status and expressing it as a percentage of the total number of days recorded by James.
James has been keeping track of the relationship between weather conditions and whether the downtown train runs on time.
To find the marginal distribution of train arrival status in percentages, we need to see the frequency of on-time and delayed trains irrespective of the weather conditions and then express these frequencies as a percentage of the total number of days recorded.
To calculate the on-time percentage:
Total on-time occurrences: 330Total recordings: 365On-time percentage = (Total on-time occurrences / Total recordings) x 100On-time percentage = (330 / 365) x 100 ≈ 90%To calculate the delayed percentage:
Total delayed occurrences: 35Delayed percentage = (Total delayed occurrences / Total recordings) x 100Delayed percentage = (35 / 365) x 100 ≈ 10%Therefore, the marginal distribution of arrival status is approximately 90% on-time and 10% delayed.
Tim mowed lawns for 2 hours and earned $4.50 per hour. Then he washed windows for 4 hours and earned $3.45 per hour. What was Tim's average earnings per hour for all 6 hours.
Answer:
$3.23 per hour
Step-by-step explanation:
4.5+4.5+3.45+3.45+3.45+3.45=19.35
19.35/6=$3.225 or $3.23 per hour
-20-7x=-2x+2 solve the equation
Answer:
-4.4
Step-by-step explanation:
In order to do this, we need to move the variables to one side, and the numerical values to the other.
-20-7x=-2x+2
We can do this by adding 7x to both sides first
-20=5x+2
Now we can subtract 2 from both sides.
-22=5x
Next, we can divide each side by 5.
x=-22/5
Then we simplify the fraction
x=-4.4
Answer:
x = -4.4
or
x = 22/-5
Step-by-step explanation:
-20-7x = -2x+2
-7x = -2x+20+2
2x-7x = 22
-5x = 22
x/-5 = 22/-5
x = -4.4
or
x = 22/-5
Please help.....………………
Answer:
50
Step-by-step explanation:
The sum of the angles of a triangle is 180
A +B +C = 180
90 +4x+ 7x-20 =180
Combine like terms
70+ 11x = 180
Subtract 70 from each side
70-70+11x = 180-70
11x=110
Divide each side by 11
11x/11= 110/11
x = 10
We want to find angle C
C = 7x-20
= 7*10-20
= 70-20
= 50
Answer:
50°
Step-by-step explanation:
7x - 20 + 4x + 90 = 180
11x = 180 - 70
11x = 110
x = 10
ACB: 7(10) - 20 = 50
What x value solves the equation?
3x – 5 = 1
Answer:
x=2
Step-by-step explanation:
Add 5 to each side.
3x-5+5=1+5
3x=6
Divide each side by 3.
Your answer would be x=2.
Answer:
X=2
Step-by-step explanation:
When 6 is added to a certain number, the result is 19. Determine the
number.
Answer:
the answer is 13 hope that helps:)
Answer:
The number is 13
Step-by-step explanation
6 + x = 19
we can move the equation around to help us get our answer
19 - 6 = x
19 - 6 = 13
Your answer is 13 :)
esther picks 100 balls at random the table shows some of the results if she picks 250 balls at random how many red balls should she expect
Answer:
Step-by-step explanation:
10. Mark built a fence around his clubhouse. The perimeter of the fence is 80 feet. The
width of the fence is 15 feet. What is the length of the fence?
Explain your answer.
P = 70 feet
15 feet
? feet
----------------------------------------------------
Answer:
if the clubhouse is 4 sided then the length would be 25 ft
Step-by-step explanation:
15x2=30
80-30=50
50/2=25
Heelpp By visual inspection, determine the best fitting repression model for the scatterplot
A. Quadratic
B. No pattern
C. Linear
D. Exponential
Restaurants often slip takeout menus under Maura's apartment door. So far, Maura has collected 15 menus, including 3 for Chinese food. Considering this data, how many of the next 20 menus slipped under Maura's door should you expect to be from Chinese restaurants? menus
Based on the proportion of Chinese food menus Maura has already received (3 out of 15),we would expect her to receive approximately 4 Chinese food menus in the next batch of 20 menus.
To solve this, we look at the probability of Maura receiving a Chinese food menu by using the proportion of Chinese menus she has already received.
This initial probability is 3 out of 15, which simplifies to 1 out of 5. Therefore, we'd expect to receive the same proportion from the next set of menus.
To predict the number of Chinese food menus in the next 20, we multiply the total number of new menus by the probability of each being Chinese:
20 menus * (1/5 probability of Chinese) = 4 Chinese menus
A garden table and a bench cost $988 combined. The garden table costs $88 more than the bench. What is the cost of the bench?
Answer:
the total cost for the bench and the table minus the cost of the garden table which is $988 - 88 =900
THIS NEEDS TO BE ANSWERED ASAP CHANCE FOR BRAINLIEST
Answer:
40
Step-by-step explanation:
Hansen's parents own a chocolate shop, and today he gets to help make the nut truffles.
Each truffle starts with one of 2 kinds of nuts and is dipped in one of 7 kinds of chocolate.
How many different nut truffles can they make?
The answer explains the calculation process to determine the number of different nut truffles that can be made, which is 14.
The number of different nut truffles that can be made is:
2 types of nuts x 7 types of chocolate = 14 different nut truffles
Why a mixed number is called "mixed" number what is mixed up here?
Because a whole number such as 1 or two is "mixed" with a fraction such as 1/2 , 1/4 , or 3/8ths.
Because numbers are all mixed up.
Because a fraction is added to a whole number.
Answer:
Because a fraction is added to a whole number
Step-by-step explanation:
assume the ratio of hand to foot 7:9 . If an artist draws a person with hands 35 inches long how long should the feet be to maintain the correct proportions ?
Answer:
45
Step-by-step explanation:
7x5=35
9x5=45
Answer:
Artist should draw persons feet in ratio of; 45inches : hands 35inches
we can multiply 7 x 10 = 70 and see that 35 is half this.
This means 9 x 10 = 90 and see that 45 is half this.
Making the ratio 35:45
Step-by-step explanation:
What is 1/3 divided by 9
Square of which numbers are equal to 4?
The answer would be 2 because a square root has to be the same 2 numbers which is 2 for this example. 2x2=4. Hope this helps! If you have anymore questions please ask me. Stay Safe! And have a good day!
Sally says, "If it's sunny, I will go to the park. When I go to the park, I go down the slide."
The next day is sunny.
What can you conclude? What law did you use to draw this conclusion?
Answer:
I can conclude that Sally went down the slide. I used deductive reasoning to get my answer. Sally said that if it was sunny, she would go to the park. She also said that if she does go to the park, she will go down the slide. Since Sally did go to the park, I know that she did go down the slide. Based on the information I have, I can use deductive reasoning to get to my answer.
Step-by-step explanation:
Based on Sally's conditions and the law of syllogism, since it's sunny, we can conclude Sally will go to the park and go down the slide.
Explanation:From Sally's statements, since the next day is sunny, we can conclude that Sally will go to the park and go down the slide. This conclusion is based on the law of syllogism in logic, which allows us to link two related conditional statements. In this scenario, the first conditional statement is 'If it's sunny, I will go to the park', and the second is 'When I go to the park, I go down the slide'. As it's sunny, the law of syllogism lets us link these conditions to infer that Sally will indeed go down the slide at the park.
Learn more about the Law of Syllogism here:https://brainly.com/question/33510890
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What is the perimeter of this tile 6 in and 2 in
Answer:
16 inches
Step-by-step explanation:
Perimeter of a rectangle is
P = 2(l+w)
=2(6+2)
=2(8)
= 16 inches
Answer:
16 in
Step-by-step explanation:
Just multiply!
21 and 22 are complementary angles. If mZ1 = 36", what is mZ2?
36°
54
144
72
Answer:
54°
Step-by-step explanation:
Complementary angles sum to 90°, thus
∠ Z2 = 90° - 36° = 54°
Determine if the set of ordered pairs represents a function. Explain why or why not. (2 points)
{(-4, 4), (-2, 2), (0, 0), (-3, -2)}
In order for a set of ordered pairs to be a function there can not be more than one x-value with a different y-value.
In this case, the set of ordered pairs: (-4, 4), (-2, 2), (0, 0), (-3, -2) is a function! There are no repeated x-values.
Hope this helped!
~Just a girl in love with Shawn Mendes
Which pair of figures appears to be congruent
Answer:
when they have equal sides and the exact shape and the same angle measures. they have tobe the same size.
Step-by-step explanation:
For example, when you have a square with sides 3 cm, then you compare it with the exact copy of the square. These squares are congruent. Two figures are congruent if and only if they have the exact same shape and the exact same size. If the corresponding sides of two figures with the same shape have the same length, then the two figures are congruent.
The figures that appear be congruent have all sides as equal and in the exact shape and can measure the same angles. They have the same size.
What are congruent?The instruments is those figures and objects that have the same size and shape. The meaning of the work congruent is that they are identical to each other and in an agreement and harmony
As per the example, the square with the sides of 3 cm, then you can compare it with the exact copy of the square. These squares are then congruent.
Find out more ifirmation about the congruement.
brainly.com/question/1675117
In AABC, a = 3-4 cm, b = 7.9 cm and c=5.3 cm. Find the measure of ZA to the
nearest degree.
I need help ASAP
Answer:
10
Step-by-step explanation:
Answer:
The value of angle A is 19.415 degrees.
Explanation:
Let's recalculate using the Law of Cosines to find the measure of angle[tex]\(A\)[/tex] in triangle [tex]\(ABC\)[/tex].
Given:
- [tex]\(a = 3.4\)[/tex] cm
- [tex]\(b = 7.9\)[/tex] cm
- [tex]\(c = 5.3\)[/tex] cm
We want to find angle [tex]\(A\)[/tex]. To use the Law of Cosines, we first need to find angle [tex]\(C\)[/tex]. We can use the Law of Cosines again:
[tex]\[ a^2 = b^2 + c^2 - 2bc \cos(A) \][/tex]
[tex]\[ (3.4)^2 = (7.9)^2 + (5.3)^2 - 2(7.9)(5.3) \cos(A) \][/tex]
[tex]\[ 11.56 = 62.41 + 28.09 - 83.54 \cos(A) \][/tex]
[tex]\[ 11.56 = 90.5 - 83.54 \cos(A) \][/tex]
[tex]\[ 83.54 \cos(A) = 90.5 - 11.56 \][/tex]
[tex]\[ 83.54 \cos(A) = 78.94 \][/tex]
[tex]\[ \cos(A) = \frac{78.94}{83.54} \][/tex]
[tex]\[ \cos(A) \approx 0.944 \][/tex]
Now, to find the measure of angle \(A\), we take the inverse cosine (cos⁻¹) of 0.944:
[tex]\[ A \approx \cos^{-1}(0.944) \][/tex]
[tex]\[ A \approx 19.415° \][/tex]
Complete the statements to find the measurements of ∠a and ∠b .
Answer:
∠a=80
∠b=50
Step-by-step explanation:
∠a and 100 are on a straight line. Therefore they are supplementary, and add to 180 degrees. So, we can say that:
∠a+100=180
To solve, subtract 100 from both sides. This will leave ∠a by itself.
∠a +100-100=180-100
∠a=80
The angles in a triangle must add to 180 degrees. Therefore,
∠a + ∠b + 50= 180
We know ∠a is 80, so we can substitute that in
80+ ∠b +50 =180
∠b+80+50=180
Combine like terms
∠b+(80+50)=180
∠b+130=180
To solve, subtract 130 from both sides. This will leave ∠b by itself.
∠b+130-130=180-130
∠b=50
Answer:
∠a = 80° and ∠b = 50°
Step-by-step explanation:
Look at angle a. Angle a and 100 both lie on the same line, which means they are supplementary and add up to 180. Then we can write: m∠a + 100 = 180. To solve this for a, we simply subtract 100 from both sides:
m∠a = 80°
Now, look at the triangle. All the angles in a triangle add up to 180, so we have the equation: m∠b + 80 + 50 = 180. Solve for b by subtracting 80 and 50 from both sides: m∠b = 50°.
Thus, ∠a = 80° and ∠b = 50°.