Answer:
commission. This is a common industry practice, and it is reasonable to assume that Harlan earned this percentage from his sales.
Step-by-step explanation:
How do you find 10% of a number?
Answer:
by dividing 10.
Step-by-step explanation:
100 percent if full. so to find ten percent, do 100 divided by 10.
Which of the following is not a piece of required information in order to determine sample size? a. estimated population standard deviation b. estimated population median c. acceptable level of sampling error d. desired level of confidence e. All are necessarv to determine sample size.
E. All are necessary to determine sample size is not a piece of required information in order to determine sample size.
Determining an appropriate sample size is an important step in the research process as it helps to ensure that the results from the sample will be representative of the population as a whole. In order to accurately determine the appropriate sample size, you need to have an estimated population standard deviation, an estimated population median, an acceptable level of sampling error, and a desired level of confidence. The population standard deviation and median will help you determine the central tendency and variability of the population, while the acceptable level of sampling error and desired level of confidence will help you determine the margin of error you are willing to accept in your results. All four of these pieces of information must be taken into consideration in order to accurately determine the appropriate sample size.
Learn more about sample size here
https://brainly.com/question/25894237
#SPJ4
Which of the following expressions is equal to
(sin 60°)(cos 30º) + (cos 60°)(sin 30°) ?
F. cos(60° -30°)
G. cos(60° +30°)
H. sin(60° -30°)
J. sin(60° +30°)
K. sin(60* 430")
+ °
2
The answer is cos 60° × cos 30° + sin 60° × sin 30° = √3/2.
Find the solution ?The fundamental guidelines and procedures to simplify any algebraic statement are as follows:By multiplying factors, remove any grouping symbols like brackets and parenthesis.
Simplify each term.
34+14
Combine fractions.
Combine the numerators over the common denominator.
3+14
Simplify the expression.
Add 3
and 1
44
Divide 4by 4
= 1.
To learn more about simplify the expression refer
https://brainly.com/question/27230537
#SPJ4
(1,3) and (-3,-5) in linear equation
Factor the polynomial
below completely:
14a-7
(Show work please)
Rs. 85000 was exempted in the yearly income of a government service holder. If he paid tax Rs. 8850 in a year at the rate of 15%. What was his monthly income?
The monthly income of the government service holder is Rs. 12000
How to determine the monthly income?A word problem is a mathematical exercise where significant background information on the problem is presented in ordinary language rather than in mathematical notation
Given that: Rs. 85000 was exempted in the yearly income of a government service holder. If he paid tax Rs. 8850 in a year at the rate of 15%.
Let P represent the yearly income. We can write that:
15% (P - 85000) = 8850
0.15(P - 85000) = 8850
0.15P - 12750 = 8850
0.15P = 8850 + 12750
0.15P = 21600
P = 21600/0.15
P = 144000
So the yearly income is Rs. 144000
Thus, the monthly income will be:
Rs. 144000 / 12 = Rs. 12000
Learn more about word problems on:
brainly.com/question/1781657
#SPJ1
equation of a circle with center (0.5, 0.5) and radius 0.5
The equation of the circle is x²+y²-x-y+0.25=0
What is a circle?
A circle is a particular type of ellipse in mathematics or geometry where the eccentricity is zero and the two foci are congruent. A circle is also known as the location of points that are evenly spaced apart from the centre. The radius of a circle is measured from the centre to the edge. The line that splits a circle into two identical halves is its diameter, which is also twice as wide as its radius.
For a circle with radius r and center (h,k), its equation would be (x-h)² + (y-k)² = r²
Given, center is (0.5,0.5) and radius is 0.5, h=0.5, k=0.5, r=0.5
The equation becomes:
(x-0.5)² + (y-0.5)² = 0.5²
⇒x²+0.25-x+y²+0.25-y=0.25
⇒x²+y²-x-y+0.25=0
Thus, the equation of a circle becomes x²+y²-x-y+0.25=0
To know more about circles visit:
brainly.com/question/29142813
#SPJ4
for the 2015 general social survey, a comparison of females and males on the number of hours a day that the subject watched tv gave the following results.
Females = 504; mean 3.13
Males = 400; mean 2.87
-. set up the hyphoteses of a significance test to analyze wheter the population means differ for females and males
- conduct all parts of the significance test if df = 503 and standard error = 0.164 interpret the P-value and report the conclusion for a = 0.05
(a) The hypothesis to analyze is H₀ : [tex]\mu_{f} = \mu_{m}[/tex] v/s H₁ : [tex]\mu_{f} \neq \mu_{m}[/tex]
(b) the value of test stat is 1.585 and the p-value is 0.114 .
In the question ,
it is given that ,
the number of females is (n₁) = 504 and
mean (μ₁) = 3.13
the number of males is (n₂) = 400 and
mean (μ₂) = 2.87 .
Part(a) ,
the hypothesis to analyze whether the population means differ for females and males is ,
H₀ : [tex]\mu_{f} = \mu_{m}[/tex] v/s H₁ : [tex]\mu_{f} \neq \mu_{m}[/tex]
Part(b)
given that df = 503 and standard error (SE) = 0.164 and α = 0.05 .
So , the test statistic is :
t = (μ₁ - μ₂)/SE
= (3.13 - 2.87)/0.164
= 1.585
the p-value of the test can be calculated by :
P-Value = P(reject H)
= P(|t| > test stat)
= P(t > 1.585)
From the t table ,
we get the value as
= 0.114
the conclusion is p-value = 0.114 > 0.05 = alpha then we fail to reject the H₀ .
Therefore , the (a) hypothesis is H₀ : [tex]\mu_{f} = \mu_{m}[/tex] v/s H₁ : [tex]\mu_{f} \neq \mu_{m}[/tex] and
(b) the t stat is 1.585 and p value is 0.114 .
The given question is incomplete , the complete question is
For the 2015 general social survey, a comparison of females and males on the number of hours a day that the subject watched tv gave the following results.
Females = 504; mean 3.13
Males = 400; mean 2.87
(a) Set up the hypothesis of a significance test to analyze whether the population means differ for females and males .
(b) Conduct all parts of the significance test if df = 503 and standard error = 0.164 interpret the P-value and report the conclusion for a = 0.05 .
Learn more about Hypothesis here
https://brainly.com/question/29745930
#SPJ4
The function h is defined by h (x) = 5x + 2 .
What is the value of h(8) ?
Responses
A) 30
B) 42
C) 38
D) 45
Answer:
Option B is the correct answer
Step-by-step explanation:
h(x) = 5x + 2, h(8)
h(8) = 5(8) + 2
h(8) = 40 + 2
h(8) = 42
Thus, The answer is 42
Here is a data set (n = 117) that has been sorted. 58.5 59.4 60.5 62.1 65.9 65.9 66.2 66.3 66.5 67.4 67.8 68 68.1 68.2 68.2 68.7 69.3 69. 469. 469.8 70. 270.5 70. 771.2 71.5 71.6 71. 9 72. 1 72.6 72.8 73.1 73.4 74.6 | 74.8 74.9 74.9 74.9 75 75.4 75.4 76. 2 76. 4 76. 5 76. 7 76.8 76.9 77.1 . 77.2 77.7 77.9 78 78. 1 78. 2 78. 9 79.4 79.5 79. 8 79.9 80.2 80.5 80. 6 80.7 81.2 81.5 81.7 81. 8 81.8 82.4 82.6 83.183. 1 83.5 83.9 83.9 84.1 | 84.2 84.3 84.3 84.6 85.2 85.6 86 86.1 | 86.1 86.5 86. 6 86. 7 87.1 87.8 88.6 89.1 90. 2 90. 6 90.7 91.4 922 93 93.3 93. 3 94.1 94. 3 95.3 95.5 | 96.1 66.4 69 71.4 74.5 76.2 77.4 79.5 81.6 83.5 85.3 87.3 92.7 101.8 Find the 33rd-Percentile: P. = Preview
The 33rd percentile is 75.4.
Percentile is defined as the value below which a given percentage falls under. The percentile formula is used when we need to compare the exact values or numbers over the other numbers from the given data i.e. the accuracy of the number.
To find the percentile, here are a few steps to use the percentile formula. If q is any number between zero and hundred, the qth percentile is a value that divides the data into two parts i.e the lowest part contains the q percent of the data and the rest of the data is the upper part.
We find the rank.
Rank = Percentile ÷ 100
Rank = 33 ÷ 100 = 0.33
So, the rank is 0.33.
Using the percentile formula,
Percentile = Rank × Total number of the data set
Percentile = 0.33 × 117
Percentile = 38.61 ≅ 39
Now, counting 39 values from left to right we reach 75.4, and we can say that all the values below 75.4 will come under the 33rd percentile. In other words, 33% of the values are below 75.4.
Therefore, the 33rd percentile is 75.4.
To learn more about percentile, visit: brainly.com/question/1594020
#SPJ4
how many cup dose it take
Answer:
4 gallons = 64 cups
1 gallons = 16 cups
3 gallons = 48 cups
Sophia earns $16 per hour and worked 7.5 hours per day. She spent
$18 per workday on lunch. Sophia saves a quarter of her remaining
money in her savings per week.
A.
Write an expression representing the amount of money
Sophia put in her savings account at the end of the week.
B. How much money did she put in her savings?
The answers to both subparts are shown:
(A) The expression is: 4x = 714
(B) Money she put in her savings account each week: $178.5
What is an expression?An expression, often known as a mathematical expression, is a finite collection of symbols that are well-formed in accordance with context-dependent principles.
Any mathematical statement that includes numbers, variables, and an arithmetic operation between them is known as an expression or algebraic expression.
In the phrase 4m + 5, for instance, the terms 4m and 5 are separated from the variable m by the arithmetic sign +.
Let's assume she works 7 days a week.
Then 7.5 * 16 = $120 (1-day earning)
30 days: 120 * 30 = 840
$18 each day on lunch: 18 * 7 = $126
Remaining: 840 - 126 = $714
A quarter of $714: 714/4 = $178.5
(A) The expression will be:
4x = 714
(B) Money she put in her savings account each week:
4x = 714
x = 714/x
x = $178.5
Therefore, the answers to both subparts are shown:
(A) The expression is: 4x = 714
(B) Money she put in her savings account each week: $178.5
Know more about expression here:
https://brainly.com/question/28934492
#SPJ1
Passes through the point (-4, -3) and is perpendicular to the line -3x - 4y = 12.
Answer:
y= [tex]\frac{4}{3}[/tex] x+ [tex]\frac{7}{3}[/tex]
Step-by-step explanation:
-3x-4y=12
1. First we need to get the equation in the form of y=mx+c to do this we add 3x to both sides and then divide it by -4 on each side to get
(add 3x to both sides) = -4y=3x+12
(divide each side by -4)= y= -[tex]\frac{3}{4}[/tex] x -3
2. to find the perpendicular gradient we find the reciprocal of the original gradient
the reciprocal of -[tex]\frac{3}{4}[/tex] is [tex]\frac{4}{3}[/tex]
3. we can check this by multiplying them and seeing of we get -1
-[tex]\frac{3}{4}[/tex] x [tex]\frac{4}{3}[/tex] = = -1
4. we then sub in the gradient [tex]\frac{4}{3}[/tex] in y=mx+c this gives us
y= [tex]\frac{4}{3}[/tex]x +c
5. to find the value of c we substitute the coordinates into the equation to get ( we do this by expanding the brackets and getting c on it own)
-3= [tex]\frac{4}{3}[/tex](-4) +c
-3= -[tex]\frac{16}{3}[/tex] +c
[tex]\frac{7}{3}[/tex]=c
6. we sub [tex]\frac{7}{3}[/tex]=c back into y= [tex]\frac{4}{3}[/tex]x +c this gives us
y= [tex]\frac{4}{3}[/tex]x + [tex]\frac{7}{3}[/tex]
7. Therefore our final answer is
y= [tex]\frac{4}{3}[/tex]x + [tex]\frac{7}{3}[/tex]
8. Fill in the boxes to estimate the
quotient.
8,521 48
8,500 ÷ blank = blank
The estimated quotient is 170.
What is the estimated quotient?The quotient is the result of a division operation.
A division operation involves the dividend divided by a divisor, which results in a quotient.
An estimated quotient is based on an approximation, which leaves out detailed calculations.
An approximated value is an amount or size closest to the true value. Approximations are determined by rounding off numbers, in this situation, the dividend, and the divisor.
8,521 ÷ 48
8,500 ÷ 50
= 170
Thus, approximating 8,521 to 8,500 and 48 to 50, the estimated quotient is 170.
Learn more about estimation at https://brainly.com/question/28416295
#SPJ1
a person leaves home and walks 4 miles west, then 5 miles southwest. how far from home is she? miles in what direction must she walk to head directly home? degrees north of east
The person is 8.325 miles far from her home and she should walk in the direction of 64.86° North Of East to head directly home .
In the question ,
from the figure ,
we see that point O is home of the person ,
it is given that person leaves the home and walks 4 miles west to point A , then 5 miles in south west direction to the point B .
So ,distance OA = 4 miles
AB = 5 miles .
In triangle OAB ,
angle OAB = 45+90 = 135°
Using Cosine Rule ,
OB² = OA² + AB² - 2*OA*AB*Cos(135)°
= 16 + 25 + 28.2843 = 69.2843
So ,OB = √69.2843 = 8.325 miles .
Now using Sine Rule ,
Sinθ/OA = Sin(135°)/OB
Sinθ = 4*Sin(135°)/8.324
Sinθ = 0.339792
So , θ = 19.86°
hence the direction from North of East is
= 45° + θ
= 45° + 19.86°
= 64.86° North Of East .
Therefore , the distance is 8.325 miles and the direction is 64.86° North Of East .
Learn more about Direction here
https://brainly.com/question/2168042
#SPJ4
6. In a company, the number of men is 3.5 times more than the number of women. How many of the company's 108 employees are men?
Answer:
84
Step-by-Step Explanation:
b.
5-50.
Use your new 30°-60°-90° and 45°-45°-90° triangle patterns to quickly find the lengths of
the missing sides
in
each of the triangles below. Do not use a calculator. Leave answers in exact form. Note: The triangles are not
necessarily drawn to scale.
a.
41
10
45°
8
4
30°
4
16
8
0
c.
d.
854
45°
9
30°
(2)
مع
60°
f.
60⁰
6
6
45°
The length of the sides of the special triangles, found using the relationship between the sides of the triangles are as follows;
(1) Length of the legs is 20 each
Length of the hypotenuse = 20·√2
(2) Length of the leg = 5
Length of the hypotenuse = 5·√2
5-50 a. Length of the leg is 10·√3
Length of the hypotenuse is 20
b. Length of the leg = 4
Length of the hypotenuse = 4·√2
c. Length of each leg = 8
d. Length of the leg = 9·√3
Length of the hypotenuse = 18
e. Length of the shorter leg = 4.5
Length of the longer leg = 4.5·√3
f. Length of the legs = 3·√2 each
5-51
Special triangles are the 30°, 60°, 90°, triangle, and the 45°, 45°, 90°, triangles.Please find attached the diagrams of special triangles, created with MS Word
What are triangles?
A triangle is a three sided polygon, that has a sum of interior angles of 180°
The lengths of the missing sides in the triangles found using the 30°–60°–90°, and 45°–45°–90°, triangle patterns are as follows;
In a 30°, 60°, 90° triangle, if the length of the shortest leg is x, the length of the hypotenuse is 2·x, and the length of the other leg is x·√3
In a 45°, 45°, 90° triangle, the length of the legs are the same, and the length of the hypotenuse is √2 multiplied by the length of one leg.
(1) The length of the legs are the same and equivalent to 20
The length of the hypotenuse side is 20·√2
(2) The length of the legs are the same and equivalent to 5
The length of the hypotenuse 5·√2
5-50 a. In the 30°, 60°, 90° triangle, the length of the adjacent, longer leg is 10·√3
The length of the hypotenuse side is 2·x
b. The triangle is a 45°, 45°, 90°, triangle
The length of the legs are 4 unit each
The length of the hypotenuse is 4·√2
c. The length of the hypotenuse in the 45°, 45°, 90° is 8·√2, therefore, the length of the legs are;
8 units each
d. The length of the shortest leg in the 30°, 60°, 90°, right triangle is 9, therefore, the length of the hypotenuse side is 2 × 9 = 18
The length of the longest leg is 9·√3
e. The length of the hypotenuse in the 30°, 60°, 90°, right triangle is 9 units, therefore, the length of the shortest leg is 4.5 units
The length of the longest leg is 4.5·√3
f. The length of the hypotenuse side of the 45°, 45°, 90°, right triangle is 6, therefore;
The length of the legs are 6/√2 = 3·√2
5-51
The dimensions of the side length of the special right triangles are;
In a 30°-60°-90° triangle, if the length of the shortest leg is x, then;
The length of the hypotenuse is 2·x
The length of the longer leg is x·√3
In a 45°-45°-90° right triangle, the length of the legs are the same, and the length of the hypotenuse is √2 multiplied by the length of one leg.
Please attached diagrams of the 45°, 45°, 90°, and the 30°, 60°, 90° triangles created with MS Word
Learn more about special triangles here:
https://brainly.com/question/16702662
#SPJ1
Find the slope of each line. Tell whether the slop is Positive, Negative, Undefined or Zero
Find the Coefficient of [tex]{x}^{n}[/tex] In the following Expansion. ( See the attached Image )
given that |x| < 1
The Coefficient of xⁿ In the Expansion 1 / (1 + x + x²) is 1
What is coefficient?A coefficient in mathematics is a multiplicative factor in a polynomial term, a series term, or an expression.
It is typically a number, but it can also be any expression. They may also be referred to as parameters
The coefficient is usually the number in front of the variable represent by an letter.
For the given problem the given letter is x and the coefficient is 1, a coefficient of 1 is most times not written and hence we know the coefficient is 1
Learn more about coefficient at:
https://brainly.com/question/1038771
#SPJ1
Thank you to whoever answers!!
Answer: whats up
hello
Step-by-step explanation:
Which scatter plot shows the best line of fit?
Multiple choice question.
A)
B)
C)
D)
Answer:
D
Step-by-step explanation:
The line of best fit is a line that represents the “average” between all of the points. It’s typically in the middle of all of the points. In this case, I’d go with D because 4 points lie on the line of best fit and the line trends sharply upwards, following the general direction of the points.
If f(x) = (x ^ 2 - x + 1)/(x - 1) find f(- 1/2)
Answer:
[tex] \frac{7}{6} [/tex]
last year, 54% of business owners gave a holiday gift to their employees. a survey of business owners conducted this year indicates that 32 of them plan to provide a holiday gift to their employees. suppose the survey results are based on a sample of 80 business owners. (a) suppose the business owners in the sample did as they plan. compute the p-value for a hypothesis test that can be used to determine if the proportion of business owners providing holiday gifts has decreased from last year. find the value of the test statistic. (round your answer to two decimal places.)
The p-value for a hypothesis test that can be used to determine if the proportion of business owners providing holiday gifts has decreased from last year is 0.0060 and the value of test statistic is - 2.51
54% of business owners gave a holiday gift to their employees. a survey of business owners conducted this year indicates that 32 of them plan to provide a holiday gift to their employees.
The survey results are based on a sample of 80 business owners
We need to find the value of test statistic.
Expected number = np = 32
80 x p = 32
p = 0.4
This is a left tailed test
test statistic is (p^ - p)/√(pq/n)
= (0.40 - 0.54)/√(.54 - (1 - 0.54) / 80)
= 0.14/√((0.54 - 0.46)/80)
= -2.51
p value = P(z < - 2.51)
= 0.00060366
= 0. 0060
Therefore, the p-value for a hypothesis test that can be used to determine if the proportion of business owners providing holiday gifts has decreased from last year is 0.0060 and the value of test statistic is - 2.51
To learn more about test statistic refer here
https://brainly.com/question/15980493
#SPJ4
suppose that 9 good fuses and 4 defective ones have been mixed up. to find the defective fuses, we test them one-by-one, at random. what is the probability that we are lucky and find both of the defective fuses in the first two tests? (5 points) 1). with replacement 2). without replacement
The probability that we are lucky and find both of the defective fuses in the first two tests with replacement is 1/13 and without replacement is 12/169.
In the given question, 9 good fuses and 4 defective ones have been mixed up.
To find the defective fuses, we test them one-by-one, at random.
We have to find the probability that we are lucky and find both of the defective fuses in the first two tests.
1). with replacement
2). without replacement
There are 9 good fuses and 4 defective ones.
So the total number of defective fuses = 9+4 = 13
Now the probability first test will find a defective is 4/13
Without replacement, 2nd will find another defective with probability = 3/12.
Probability of finding 2 defectives on 1st two tests is
P(R) = 4/13 x 3/12
P(R) = 12/156
P(R) = 1/13
Now the with replacement the probability is
P(E) = 4/13 x 3/13
P(E) = 12/169
The probability that we are lucky and find both of the defective fuses in the first two tests with replacement is 1/13 and without replacement is 12/169.
To learn more about probability link is here
brainly.com/question/11034287
#SPJ4
graham is hiking at an altitude of 14,040 feet and is descending 50 feet each minute. max is hiking at an altitude of 12,500 feet and is ascending 20 feet each minute. how many minutes will it take graham and max to meet at the same altitude? a. 18.5 minutes b. 36 minutes c. 51.3 minutes d. 22 minutes
Answer: D:22,
14,040-12,500=1540.
1540/70 = 22
Find A using the formula A = Pert given the following values of P, r, and t. Round to the nearest hundredth. See Example.
EXAMPLE
Investing. If $25,000 accumulates interest at an annual rate of 8%, compounded continuously, find the balance in the account in 50 years.
Strategy We will substitute 25,000 for P, 0.08 for r, and 50 for t in the formula A = Pert and calculate the value of A.
Why The words compounded continuously indicate that we should use the base-e exponential growth/decay formula.
The amount received for continous compounding for 50 yrs
Let A represent the total Amount received
Let P represent the principle
Let r represent the rate of interest
Let t represent the time taken
Then for Compound Interest(C.I)
A= P[tex][1 + \fract {r^{n}}{100}]^{t}[/tex]
the formula given above is used when we have to calculate the amount for a small amount of time such as 5-10 yrs
When talking about continuous compounding, i.e. where compounding interest takes place directly for a long period of time then we use the formula:
A= P[tex]e^{rt}[/tex]
Given in Question:
P= $25,000
r=8%
t=50
Then using the formula for continuous compounding:
A= P[tex]e^{rt}[/tex]
A= 25000([tex]e^{(0.08)(50)}[/tex])
A = 25000 x [tex]e^{4}[/tex]
A = 25000 x 54.598
A = $1,364,953.7508
A≈ $1,364,953.751
Learn more about Compound Interest at:
brainly.com/question/25857212
#SPJ4
christina, a restaurant manager, would like to make the claim that the average number of customers that her restaurant serves per hour is more than 57. christina samples 29 hours over the course of a week and records the number of customers served and obtains a sample mean of 62 customers per hour.at the 2.5% significance level, should christina reject or fail to reject the null hypothesis given the sample data below?
Reject the null hypothesis because [tex]$p$[/tex]-value [tex]$=0.0045$[/tex] is less than the Significance level x=0.025.
What is Null Hypothesis ?The null hypothesis is a widely used statistical theory that states that for any given single observable variable, there is no statistical relationship or significance between any two sets of observed data and measured events.
According to the given information
[tex]& H_0: \mu=57 \\[/tex]
[tex]& H_a ; \mu > 57 \\[/tex]
[tex]& \alpha=0.025 \\[/tex]
[tex]& \text { Test Statistic }=2.61[/tex]
So,
This is right tailed test
[tex]& \text { Using } z \text { table } \\[/tex]
[tex]& p(z > 2.61) \\[/tex]
[tex]&= 1-p(z < 2.61) \\[/tex]
[tex]&= 1-0.9955 \\[/tex]
[tex]& p \text {-value }= 0.0045[/tex]
Reject the null hypothesis because [tex]$p$[/tex]-value [tex]$=0.0045$[/tex] is less than the Significance level x=0.025.
To know more about Null hypothesis
https://brainly.com/question/28920252
#SPJ4
Which of the following is a equation of x-axis 1)y-0. 2)x-0. 3)x-0. 4)y-0
Answer:
none of the listed options
Step-by-step explanation:
the equation for x axis is y=0
more than half of babies in the united states are born to unmarried parents. we want to know if this proportion is increasing. how do we define the population parameter of interest?
The current proportion of babies born to unmarried parents.
Given that,
In the United States, newborns born to unmarried parents make up more than half of all births. We are interested in learning if this ratio is rising. How should the population parameter be defined?
To find : Define the population parameter that interest ?
The present proportion of children born to unmarried parents should be our population parameter of interest since we want to know if the proportion is rising.
Our population parameter of interest should be the current proportion of children born to unmarried parents since we want to know if the proportion is increasing.
Therefore, the current percentage of children born to unmarried parents option (a) is right.
To learn more about proportion click here:
brainly.com/question/3254974
#SPJ4
???????????????????????????
