To check the normality of the sampling distribution for a one-sample z confidence interval for proportions, the sample size should be large (typically n > 30), and the number of successes and failures in the sample should both be at least 10.
To check for normality of the sampling distribution for a one-sample z confidence interval for proportions, we need to ensure that the following conditions are met:
Large sample size: The sample size should be sufficiently large (typically n > 30). This is because the central limit theorem states that for large enough sample sizes, the sampling distribution of the sample proportion will be approximately normal, regardless of the underlying distribution of the population.
Success-Failure Condition: The number of successes (np) and failures (n(1-p)) in the sample should both be at least 10. This condition ensures that the binomial distribution of the sample proportion is approximately normal.
If these conditions are met, then we can assume that the sampling distribution of the sample proportion is approximately normal, and we can proceed to construct a one-sample z confidence interval for proportions.
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Ralph earns $72,000 annually as an architect and is paid semimonthly. Alice also earns $72,000 but she is paid biweekly. How many more checks does Alice receive in a year when compared to Ralph?
Alice receives 2 more paychecks in a year compared to Ralph.
How to calculate the difference in the number of paychecksSince Ralph is paid semimonthly, he receives 24 paychecks in a year (twice a month). Alice, on the other hand, is paid biweekly, which means she receives 26 paychecks in a year (once every two weeks).
To calculate the difference in the number of paychecks, we can subtract the number of paychecks Ralph receives from the number Alice receives:
Number of paychecks for Alice - Number of paychecks for Ralph = 26 - 24 = 2
Therefore, Alice receives 2 more paychecks in a year compared to Ralph.
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the null and alternative hypotheses for a hypothesis test of the difference in two population proportions are: null hypothesis: p 1 equals p 2 alternative hypothesis: p 1 is greater than p 2 notice that the alternative hypothesis is a one-tailed test. suppose proportions ztest method from statsmodels is used to perform the test and the output is (1.13, 0.263). what is the p-value for this hypothesis test? select one.
The p-value for this hypothesis test is 0.263.
In this case, the null and alternative hypotheses for a hypothesis test of the difference in two population proportions are:
null hypothesis: p1 = p2
alternative hypothesis: p1 > p2
Notice that the alternative hypothesis is a one-tailed test.
Suppose proportions z test method from stats models is used to perform the test and the output is (1.13, 0.263).
To find the p-value for this hypothesis test, we need to use the output from the statsmodels function.
The second number in the output is the p-value.
Therefore, the p-value for this hypothesis test is 0.263.
The first number in the output is the z-value, which is not relevant to finding the p-value. Therefore, we can ignore it. Answer: 0.263
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The daily high temperatures in degrees Fahrenheit in Allentown, PA, for a period of 10 days are shown below. 76 80 89 96 98 100 98 91 89 82 Which statement correctly describes the data?
A the median value is 98
B the upper quartile value is 96
C the lower quartile vlue is 76
d the interquartile range is 16
Answer:
the only correct statement is B: the upper quartile value is 96.
Step-by-step explanation:
First, let's put the temperatures in order: 76, 80, 82, 89, 89, 91, 96, 98, 98, 100.
A. To find the median, we need to find the middle value in the ordered set of data. Since there are an even number of values, we take the average of the two middle values. The two middle values are 89 and 91, so the median is (89+91)/2 = 90. Therefore, statement A is false.
B. To find the upper quartile, we need to find the value that separates the highest 25% of the data from the rest. Since there are 10 values, the upper quartile is the 7th value when the data is ordered. The 7th value is 96, so statement B is true.
C. To find the lower quartile, we need to find the value that separates the lowest 25% of the data from the rest. Since there are 10 values, the lower quartile is the 3rd value when the data is ordered. The 3rd value is 82, so statement C is false.
D. The interquartile range is the difference between the upper quartile and the lower quartile. From our previous calculations, we know that the upper quartile is 96 and the lower quartile is 82. Therefore, the interquartile range is 96-82 = 14. Statement D is false.
Therefore, the only correct statement is B: the upper quartile value is 96.
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Using the recursive rule we know that the explicit formula for f(11) would be a₁₁ = a₁₀ + 11.
What is the recursive rule?A formula that explains how to move from one word in a sequence to the next is known as a recursive rule for a sequence.
The variable is typically used to represent the term "number." In other words, takes on the values 1, 2, 3, etc.
For the first, second, third, etc. terms.
So, the recursive rule formula is:
aₙ = aₙ₋₁ + d
d = 72 - 61 = 11
Then, insert values and calculate as follows:
aₙ = aₙ₋₁ + d
a₁₁ = a₁₁₋₁ + d
a₁₁ = a₁₀ + d
a₁₁ = a₁₀ + 11
Therefore, using the recursive rule we know that the explicit formula for f(11) would be a₁₁ = a₁₀ + 11.
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If a family deposits $500 at the beginning of the first year into a bank account that pays 7% annual interest, how much will the family have in the account at the end of 15 years (Hint: $500 is a0, think about a1 as the value of the account at the end of the 1st year.)
the answer is 13,444.03 its given to us i just need the work to show how i can get the answer
The family will have approximately $13,444.03 in the account at the end of 15 years.
To find the value of the account at the end of 15 years, we'll use the formula for compound interest, which is:
A = P * (1 + r)^n
Where A is the final amount,
P is the principal amount (the initial deposit),
r is the annual interest rate (as a decimal), and n is the number of years.
In this case, P = $500,
r = 7% (0.07),
and n = 15.
Step 1: Convert the interest rate to a decimal:
7% = 0.07
Step 2: Add 1 to the interest rate: 1 + 0.07 = 1.07
Step 3: Raise the result from Step 2 to the power of the number of years:
[tex](1.07)^15[/tex]≈ 2.7591
Step 4: Multiply the principal amount by the result from Step 3:
$500 * 2.7591 ≈ $1377.55.
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Some states, such as Oregon, do not have a state imposed sales tax like other states. However, the state government has to make up that financial difference in another way. Which option is better for the individual: a state with sales tax or a state without sales tax? Explain why. Which option is better for the state government? Explain why. Give an opinion in your own words, using complete sentences.
A state with a sales tax is a better option for both individuals and state governments.
WHAT IS SLES TAX?
A state without a sales tax may seem preferable since they do not have to pay additional taxes on purchases. However, in such states, the government often imposes higher income taxes or property taxes to compensate for the lack of sales tax revenue. Therefore, it ultimately depends on the individual's financial situation and spending habits.
From the state government's perspective, having a sales tax is generally more beneficial as it provides a consistent and reliable revenue stream. Sales tax revenue is collected on a regular basis and is not subject to fluctuations in the economy or changes in demographics. Additionally, sales tax revenue is not as heavily reliant on the state's residents and can be partially collected from tourists and visitors who make purchases within the state.
In my opinion, a state with a sales tax is a better option for both individuals and state governments. While paying additional taxes may not seem appealing, it allows the state to fund essential services such as education, healthcare, and infrastructure. Additionally, sales tax revenue is spread across a wider population, making it more equitable and less burdensome on individual taxpayers. Overall, having a sales tax system in place helps to ensure that the state government can continue to provide essential services and maintain a stable economy.
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our environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 5.5 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 13 samples is 6.0 ppm with a standard deviation of 0.9 . assume the population is normally distributed. does the data support the researcher's claim at the 0.05 level? make the decision to reject or fail to reject the null hypothesis.
The data support the researcher's claim that the current ozone level is not at a normal level, at the 0.05 level of significance, concluded with the help of a one-sample t-test.
To test whether the current ozone level is significantly different from the normal level of 5.5 ppm, we can use a one-sample t-test.
The null hypothesis is that the mean ozone level is equal to 5.5 ppm:
H0: mu = 5.5
The alternative theory is that the average ozone level exceeds 5.5 ppm:
Ha: mu > 5.5
The significance threshold will be set at 0.05.
t = (x - mu) / (s / sqrt(n)) is the test statistic for a one-sample t-test.
where x is the sample mean, is the hypothesized population mean, s represents the sample standard deviation, and n represents the sample size.
When we substitute the provided values, we get:
t = (6.0 - 5.5) / (0.9 / sqrt(13)) = 1.936
Using a t-table with 12 degrees of freedom (n-1=13-1=12) and a significance level of 0.05, the critical value is 1.782. Since our calculated t-value (1.936) is greater than the critical value (1.782), we reject the null hypothesis.
Therefore, we can conclude that the data support the researcher's claim that the current ozone level is not at a normal level, at the 0.05 level of significance.
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the probability distribution for the number of automobiles lined up at a lakeside olds dealer at opening time (7:30 am) for service is number probability 1 0.20 2 0.20 3 0.40 4 0.20 on a typical day, how many automobiles should lakeside olds expect to be lined up at opening time?
Lakeside Olds can expect around 2.6 automobiles to be lined up at the opening time for service.
To find the expected number of automobiles lined up at the opening time, we can use the following formula is used
Expected value = Σ (number of automobiles * probability)
Using the probability distribution provided in the question, we have:
Expected value = (10.20) + (20.20) + (30.40) + (40.20)
Expected value = 0.20 + 0.40 + 1.20 + 0.80
Expected value = 2.6
Therefore, on a typical day, Lakeside Olds can expect around 2.6 automobiles to be lined up at the opening time for service.
Note that since the expected value is not a whole number, it is an estimate and may not represent the actual number of automobiles on any given day.
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What is the completely factor simplified form of the rational expression below?
x²+6x/x+5 4x+15/x+5
A. x²+2x-15/x+5
B. x²+2x+15x/+5
C.x+5
D. x-3
Answer:A
Step-by-step explanation:
To simplify the rational expression (x²+6x)/(x+5) + (4x+15)/(x+5), we first factor the numerator of the first fraction as x(x+6). Then, we factor the numerator of the second fraction as 4(x+3). Now, we can combine the fractions by finding a common denominator of (x+5) and adding the numerators:
(x²+6x)/(x+5) + (4x+15)/(x+5) = (x(x+6) + 4(x+3))/(x+5)
Simplifying the numerator further, we get:
(x²+6x + 4x + 12)/(x+5) = (x²+10x+12)/(x+5)
Now we can factor the numerator by finding two numbers that multiply to 12 and add to 10. Those numbers are 2 and 6. So we can write:
(x²+10x+12)/(x+5) = (x+2)(x+6)/(x+5)
Therefore, the completely factored and simplified form of the given rational expression is (x+2)(x+6)/(x+5). So the answer is A.
Determine the discriminant of 3x² - 5x+4=0.
It takes 28 minutes to play 8 songs on a radio. Every song is played for the same length of time. How long does it take to play 1 song?
Answer: 3 minutes and 30 seconds, or 3.5 minutes
pulation from which the samples are taken. the mean of the sample means will be equal to the population mean, andn a large population, 95% of the households have cable tv. a simple random sample of 81 households is to be contacted and the sample proportion computed. what is the probability that the sampling distribution of sample porportions is less than 91%?
The probability that the sampling distribution of sample proportions is less than 91% is very low, approximately 0.0000025.
The sample size is n = 81 and the population proportion is p = 0.95. The mean of the sampling distribution of sample proportions is equal to the population proportion, which is 0.95. The standard deviation of the sampling distribution of sample proportions is given by the formula sqrt(p*(1-p)/n), which is approximately 0.03. Thus, the z-score corresponding to a sample proportion of 0.91 is (0.91 - 0.95)/0.03 = -1.33. The probability that the sampling distribution of sample proportions is less than 91% is the same as the probability that a standard normal variable is less than -1.33, which is approximately 0.0000025 (using a standard normal distribution table or calculator). This indicates that it is very unlikely to obtain a sample proportion less than 91% if the true population proportion is 95%.
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i need help ASAP!!!
the equation of the circle with center (0,-3) containing the point (√32,-2) is x² + (y + 3)² = 33.
How to solve an equation?
To determine the equation of a circle, we need to know the coordinates of its center and the radius. The formula for the equation of a circle is (x - a)² + (y - b)² = r², where (a, b) represents the center of the circle and r represents its radius.
In this case, the center of the circle is given as (0,-3), so we can substitute these values into the formula: (x - 0)² + (y - (-3))² = r²
To find the value of r, we need to use the fact that the circle contains the point (√32,-2). We know that any point on the circle will be a distance r away from the center, so we can use the distance formula to find r.
The distance between the center (0,-3) and the point (√32,-2) is:
sqrt[(√32 - 0)² + (-2 - (-3))²] = sqrt[32 + 1] = sqrt(33)
Therefore, the radius r is sqrt(33).
Substituting this value into the equation of the circle, we get:
(x - 0)² + (y - (-3))² = (sqrt(33))²
Simplifying this equation, we get:
x² + (y + 3)² = 33
So the equation of the circle with center (0,-3) containing the point (√32,-2) is x² + (y + 3)² = 33.
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5.40. a multiple-choice test consists of eight questions and three answers to each question (of which only one is correct). if a student answers each question by rolling a balanced die and checking the first answer if he gets a 1 or 2, the second answer if he gets a 3 or 4, and the third answer if he gets a 5 or 6, what is the probability that he will get exactly four correct answers?
The probability that the student will get exactly four correct answers is approximately 0.1706
To solve this problem, we can use the binomial distribution, which gives the probability of getting a certain number of successes in a fixed number of independent trials, where each trial has the same probability of success.
In this case, each question has three possible answers, only one of which is correct. So the probability of getting a correct answer by guessing is 1/3.
Let X be the number of correct answers out of 8. Then X follows a binomial distribution with n=8 and p=1/3.
To get exactly four correct answers, we need to get four successes and four failures in any order. The number of ways to choose four questions to answer correctly is 8 choose 4 (written as 8C4), which is equal to 70. The probability of getting four successes and four failures is therefore
P(X=4) = (8C4) × (1/3)^4 × (2/3)^4
= 70 × 1/81 × 16/81
= 1120/6561
≈ 0.1706
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A mathematics teacher wanted to see the correlation between test scores and homework. The homework grade (x) and test grade (y) are given in the accompanying table. Write the linear regression equation that represents this set of data, rounding all coefficients to the nearest tenth. Using this equation, estimate the homework grade, to the nearest integer, for a student with a test grade of 69.
Homework Grade (x) Test Grade (y)
77 64
76 76
60 59
72 57
79 70
79 64
75 77
72 77
The linear regression equation that represents this set of data is y=12x-860
Define linear regressionLinear regression is a statistical method used to model the relationship between two variables by fitting a linear equation to the observed data. The goal of linear regression is to find the best-fitting straight line that represents the relationship between the two variables.
the linear regression equation in the form of y = mx + b, where m is the slope and b is the y-intercept.
Putting the initial values,
x=77
y=64
64=77m+c.......Equation1
Taking second values, we get
x=76
y=76
76=76m+c.......Equation2
Subtracting the Equation 1 from 2, we get
12=m
Putting the value of m=12 in equation 1, we get
c=-860
Hence, The linear regression is y=12x-860
Now, Test grade, x=69
Homework grade, y=12x-860
69=12x-860
69+860=12x
x=77.4
Using this equation, estimate the homework grade is 77.4 for r a student with a test grade of 69.
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This camera was on sale for 20% off.
If Alex paid $220, what was the full original price?
Answer: The full price was 275
help asappp assignment closes soon!!
The measures of the angles x and y are:
m∠y = = 148°
m∠x = 153°
How to get the measures of the angles?Remember that:
The sum of two adjacent angles is always 180°
The sym of the interior angles of a triangle is always 180°
With the first rule, we know that:
m∠a + m∠y = 180°
And we know that m∠a = 32°, then:
32° + m∠y = 180°
m∠y = 180° - 32° = 148°
Now, the angle at b is 59°, then the top angle of the triangle is:
180° - 59° = 121°
And the left angle in the triangle is A, such that:
A + 121° + 32° = 180°
A = 180° - 32° - 121° = 27°
And that angle plus the measure of x must be 180°, then:
m∠x + 27° = 180°
m∠x = 180° - 27° = 153°
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true or false: if one assumes two or more groups are from separate populations then the different groups are considered related samples for conducting statistical tests.
False. If one assumes two or more groups are from separate populations, the different groups are considered unrelated or independent samples for conducting statistical tests.
In statistical analysis, there are two types of samples: related (also known as dependent or paired) and unrelated (also known as independent or unpaired). Related samples are taken from the same population, often involving before-and-after measurements, repeated measures, or matched pairs.
Unrelated samples are taken from separate populations, with no inherent connection between the samples.
When you want to compare two or more groups, the choice of related or unrelated samples will determine the type of statistical test you should use.
For related samples, you can use tests like the paired t-test, Wilcoxon signed-rank test, or repeated measures ANOVA. For unrelated samples, you can use tests like the independent t-test, Mann-Whitney U test, or one-way ANOVA.
In summary, assuming that two or more groups are from separate populations means they are considered unrelated or independent samples, not related samples, for conducting statistical tests.
The choice of related or unrelated samples will guide you in selecting the appropriate statistical test for your analysis.
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if kayden has 3 times as many quarters as dimes and they have a combined value of 425 cents, how many of each coin does he have?
Kayden has 5 dimes and 15 quarters because he has three times as many quarters as dimes, and their total value of coins is 425 cents.
Let's use algebra to solve the problem.
Let x be the number of dimes that Kayden has.
Then the number of quarters he has is 3x (since he has 3 times as many quarters as dimes).
The value of x dimes is 10x cents, and the value of 3x quarters is 75x cents (since a quarter is worth 25 cents).
According to the problem, the total value of the coins is 425 cents. So we can write the equation:
10x + 75x = 425
Simplifying and solving for x, we get:
85x = 425
x = 5
Therefore, Kayden has 5 dimes and 3x = 15 quarters.
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Jerome uses the formula, P = DB, to find his approximate six-month premium when his driver risk factor, D, is 1.02 and the basic six-month premium is $500.
What will his monthly premium be?
A. $85.00
B. $270.60
C. $300.50
D. $332.00
Answer:
A) $85.00
Step-by-step explanation:
To find Jerome's monthly premium, we need to divide his six-month premium by 6:
P = DB/6
P = (1.02)(500)/6
P = 85
Therefore, Jerome's monthly premium will be $85. Answer choice A is correct.
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The recursive and explicit formulae of the given arithmetic expression are:
Recursive formular = [tex]a_{n+1} = a_{n-5}[/tex]
Explicit formular is Tn = 68 - 53n
Explain explicit formulas and recursive formulas.You can determine the value of any term in a series using an explicit formula. A subset of integers are the natural numbers, which are 1, 2, 3, 4, etc. If you know the value of the (n-1)th term in a series and have access to its recursive formula, you can use it to determine the value of the nth term. The primary distinction between recursive and explicit formulas is that the former provides the value of a particular phrase based on the preceding term, while the latter provides the value of a particular term based on the position.
Given:
a1 = 63
a2 = 67 = 63 - 5 = a1 - 5
Recursive formular = [tex]a_{n+1} = a_{n-5}[/tex]
a = 63, d = -5
F(11) = a + (n - 1)d = 63 + (n - 1)-5 = 63 - 5n + 5 = 68 - 53n
Explicit formular is Tn = 68 - 53n
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Can someone do step to step for question c please thank u
Answer:
x=-2
Step-by-step explanation:
If we insert 7 arethmatic means between -24 , 16, then the fourth mean is
The fourth Arithmetic mean is -4.
To find the fourth arithmetic mean between -24 and 16, first calculate the common difference between the terms. The formula for this is:
Common difference (d) = (Final term - Initial term) / (Number of means + 1)
In this case, the initial term (a) is -24, the final term (b) is 16, and the number of arithmetic means (n) is 7.
d = (16 - (-24)) / (7 + 1)
d = (16 + 24) / 8
d = 40 / 8
d = 5
Now, you can find the fourth arithmetic mean (a_4) using the formula:
a_4 = a + 4d
a_4 = -24 + 4(5)
a_4 = -24 + 20
a_4 = -4
So, the fourth arithmetic mean is -4.
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Model Real Life You arrange eight chairs around a circle that has eight sections. Find the sum of the angle measures of 7 of the sections.
The sum οf the angle measures οf 7 οf the sectiοns is 315 degrees.
What are Angles?An angle is a geοmetric figure fοrmed by twο rays that share a cοmmοn endpοint, called the vertex. It is usually measured in degrees οr radians and describes the amοunt οf rοtatiοn between the twο rays.
If we arrange eight chairs arοund a circle that has eight sectiοns, each sectiοn will have a central angle οf 360 degrees / 8 = 45 degrees.
Tο find the sum οf the angle measures οf 7 οf the sectiοns, we can add the central angles οf thοse 7 sectiοns:
7 x 45 degrees = 315 degrees.
Therefοre, the sum οf the angle measures οf 7 οf the sectiοns is 315 degrees.
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Work out the values of a, b, c and d.
Justify each of your answers.
The values of a, b, c ,d are 54,31,28,67 respectively
What is circle geometry?A circle is a round-shaped figure that has no corners or edges. In geometry, a circle can be defined as a closed shape, two-dimensional shape, curved shape.
There are different theorems that can be used to determine various missing angles In a circle.
angle c = 28°( angle in the same segment are equal)
angle b = 31( angle in the same segment)
angle d = 180-( 82+31) ( sum of angle in a triangle)
d = 180 - 113
d = 67°
angle a = 180-( 98+28) ( sum of angle Ina triangle)
a = 180- 126
a = 54°
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the revenue from selling items is , and the total cost is . write a function that gives the total profit earned, and find the quantity which maximizes the profit.
Solving for q will give us the optimal quantity that maximizes the profit, a function that gives the total profit earned can be written as:
Profit(q) = (Revenue per item - Cost per item) * q
Assuming that the revenue and cost are functions of the quantity sold (q), the total profit can be calculated as follows:
Profit(q) = Revenue(q) - Cost(q)
To find the quantity which maximizes the profit, we can take the derivative of the profit function with respect to q and set it equal to zero, and then solve for q:
Profit'(q) = Revenue'(q) - Cost'(q) = 0
Solving for q will give us the quantity that maximizes the profit. However, without knowing the specific forms of the revenue and cost functions, we cannot write a specific profit function or find the quantity that maximizes the profit.
In general, the profit function can be written as:
Profit(q) = (Revenue per item - Cost per item) * q
where the revenue per item and cost per item are functions of q. To find the quantity that maximizes the profit, we need to differentiate the profit function with respect to q and set it equal to zero:
Profit'(q) = Revenue'(q) - Cost'(q) = 0
Solving for q will give us the optimal quantity that maximizes the profit.
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Ten cc of a solution of acid and water is 30% acid. I wish to dilute the acid in the mixture by adding water to make a mixture that is only 6% acid. How much pure water must I add to accomplish this?
Let's call the amount of pure acid in the original 10cc solution A.
A = 0.3(10cc) = 3cc
Let's also call the amount of pure water we need to add to dilute the solution by x cc.
So after we add x cc of water, we have a new solution with a total volume of (10 + x) cc, and the amount of pure acid in the new solution is still 3cc.
To have a 6% acid solution, we know that:
3cc / (10 + x) cc = 0.06
Solving for x:
3cc = 0.06(10 + x)cc
3cc = 0.6 + 0.06x cc
2.4cc = 0.06x cc
x = 40cc
So we need to add 40cc of pure water to dilute the 10cc 30% acid solution to a 6% acid solution.
how many solutions does −5x+12=−12x−12 have
Answer:
one solution, x = - [tex]\frac{24}{7}[/tex]
Step-by-step explanation:
- 5x + 12 = - 12x - 12 ( add 12x to both sides )
7x + 12 = - 12 ( subtract 12 from both sides )
7x = - 24 ( divide both sides by 7 )
x = - [tex]\frac{24}{7}[/tex]
Two hundred items were sold during the Victory High School Math Competition Finals in Wenatchee for a total of $130. The only items sold were cans of soda for $0.50 and bags of popcorn for $0.75
Answer:
Step-by-step explanation:
200 Items were sold
For A total of $130
The Items sold were 0.50
and 0.75.
130 Cans of soda were sold
86 Bags Of popcorn were sold.
can't get this rule answer. I got it wrong...
Answer:
Asymptotes can be defined as lines that the curve approaches but never touches or crosses.