Lisa has played in 6 soccer matches. Her brother Josh has played in 18 soccer
matches. Lisa says Josh has played in 12 times as many matches as she has.
Use the drop-down menus to explain why Lisa's statement is not correct.
Click the arrows to choose an answer from each menu.
Lisa found the number that when Choose...
could have used the equation Choose...
played in Choose....
Y
6 is equal to 18. Instead, Lisa
to find the correct answer. Josh has
times as many soccer matches as Lisa.
Y
Y
Done →

In order to solve the heat equation with non-homogeneous boundary conditions, we can use a technique known as the method of separation of variables.

Yes, that's correct. In order to solve the heat equation with non-homogeneous boundary conditions, we can use a technique known as the method of separation of variables.

This technique involves assuming that the solution to the heat equation can be written as a product of functions, each of which depends only on one of the spatial variables.

Once we have found the solution to the homogeneous heat equation with the given boundary conditions, we can subtract this solution from the solution to the non-homogeneous problem to obtain a new function that satisfies the non-homogeneous boundary conditions.

This is because the difference between the two functions satisfies the homogeneous boundary conditions, and therefore the heat equation. By applying the initial conditions to this new function, we can obtain the solution to the non-homogeneous heat equation with the given boundary conditions.

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The value of the 'x' is 3.7 units

Given a right-angle triangle, Hypotenuse is 15 units and one of the angles is 42°

To find 'x' We have to use trigonometric ratios

The cosine (cos) of an angle in a right triangle is the ratio of the length of the adjacent side to the angle to the length of the hypotenuse.

cos θ = Adjacent Side / Hypotenuse.  

From the figure, The length of the Adjacent side of the angle = x and the length of Hypotenuse = 15

cos 42° = x/15

0.74 = x/5

Multiply by 5 on both sides

5 [x/5] = 5 × 0.74

x = 3.7

Therefore, The value of the 'x' is 3.7 units

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The equation that best represents y, the total cost for x gallons of gas is y = 2.12x.

The equation that best represents y, the total cost for x gallons of gas if Mrs. Masek recently filled her car with gas and paid $2.12 per gallon is :y = 2.12x

Explanation :Mrs. Masek recently filled her car with gas and paid $2.12 per gallon. Let x be the number of gallons filled in the car. Now, y can be calculated using the cost per gallon of gas and the number of gallons filled in the car. Total cost (y) = Cost per gallon × Number of gallons filled in the car. Substituting the given values, we have :y = 2.12x

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The solution of the differential equation t ln (t) dr/dt + r = 3te^t is  r = (3/t) - 3e^(-t)/ln(t) + C/ln(t)

To solve the given differential equation:

t ln(t) dr/dt + r = 3te^t             ...... (1)

Divide the equation (1) by t ln(t) then equation (1) chages to:

dr/dt + (1/t ln(t))r = 3e^t/t ln(t)

The given equation is a reducible linear differential equation to reduce in linear form we multiply by the integrating factor.

The integrating factor is given by:

μ(t) = e^∫(1/t ln(t))dt

= e^ln(ln(t))

= ln(t)

Thus,

ln(t) dr/dt + r ln(t) = 3te^t

d/dt (r ln(t)) = ln(t) dr/dt + r/t

Substituting this into the equation, we get:

d/dt (r ln(t)) = 3te^t/t

Integrate both sides;

r ln(t) = 3e^t ln(t) - 3e^t + C

r = (3/t) - 3e^(-t)/ln(t) + C/ln(t)

r = (3/t) - 3e^(-t)/ln(t) + C/ln(t)

hence, the solution of the differential equation is r = (3/t) - 3e^(-t)/ln(t) + C/ln(t), where C is a arbitrary constant.

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The area of the figure is 84 in².

We have,

The figure has two shapes.

Trapezium and a triangle.

Now,

Area of the trapezium.

= 1/2 x (14 + 25) x (2 + 2)

= 1/2 x 39 x 4

= 78 in²

And,

Area of the triangle.

= 1/2 x 4 x 3

= 1/2 x 4 x 3

= 6 in²

Now,

Area of the figure.

= 78 + 6

= 84 in²

Thus,

The area of the figure is 84 in².

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The value for the new mean, after removing a score with a value of X = 4 from the population, is c. 66/7.

To calculate the new mean, we need to subtract the score that is removed from the original sum of scores and then divide by the new number of scores.

Given that the population originally has N = 7 scores with a mean of μ = 10, the sum of the scores is N * μ = 7 * 10 = 70.

When the score of 4 is removed, the sum of the remaining scores becomes 70 - 4 = 66. The new number of scores is N - 1 = 7 - 1 = 6.

Therefore, the new mean is 66/6 = 11.

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Step-by-step explanation:

log2 (7) = x  

2^(log2(7) )  = 2^x

        7 = 2^x                   <======this may be what you want

a) The graph of the ANOVA test is illustrated below.

b) The relationship between identification and empathy for

i)  Students who played neutral games is 0.328

ii. Students who played Half-Life is 0.035

iii. Students who played GTA is 0.149

Using the data provided, we can perform ANOVA by fitting a linear model with "game.type" as the independent variable and "empathy" as the dependent variable. We can then use the "anova" function in R to perform the ANOVA test. The results show that the p-value for the "game.type" variable is 0.000242, which is less than the significance level of 0.05. This indicates that there is a significant difference between the mean empathy scores for the different types of games.

To further investigate this difference, we can use Tukey's HSD post-hoc test to compare the means of each pair of game types. The results show that the mean empathy score for GTA games is significantly lower than the mean empathy score for neutral games (p-value < 0.001) and Half-Life games (p-value = 0.002), but there is no significant difference between the mean empathy scores for neutral and Half-Life games.

To explore the relationship between identification and empathy, we can first subset the data for individuals who played each type of game using the "subset" function in R. We can then create scatterplots to visualize the relationship between identification and empathy for each subset.

For students who played neutral games, the scatterplot shows a positive correlation between identification and empathy, suggesting that individuals who identified more with their game character also had higher empathy scores. However, the correlation is not significant (p-value = 0.328), indicating that we cannot reject the null hypothesis of no correlation.

For students who played Half-Life, the scatterplot also shows a positive correlation between identification and empathy, which is significant (p-value = 0.035). This suggests that individuals who identified more with their Half-Life game character also had higher empathy scores.

For students who played GTA, the scatterplot shows a negative correlation between identification and empathy, indicating that individuals who identified more with their GTA game character had lower empathy scores. However, the correlation is not significant (p-value = 0.149), indicating that we cannot reject the null hypothesis of no correlation.

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The expression ln(y) ln(z) can be condensed to ln(yz) using the product rule of logarithms. To condense the expression ln(y) ln(z) using the properties of logarithms, we can simplify it into a single logarithm expression.

1. The product rule of logarithms states that ln(a) + ln(b) is equal to ln(a * b). Applying this rule, we can rewrite the given expression as ln(yz).

2. The natural logarithm ln is a mathematical function that gives the logarithm of a number with respect to the base e. When dealing with logarithms, certain rules and properties can help simplify expressions.

3. In this case, we have ln(y) ln(z), where ln(y) and ln(z) are separate logarithmic terms. By applying the product rule of logarithms, we can combine these terms into a single logarithmic expression.

4. The product rule states that the logarithm of a product is equal to the sum of the logarithms of the individual factors. Therefore, ln(y) + ln(z) simplifies to ln(yz). This condenses the expression into a more concise form. So, the expression ln(y) ln(z) can be condensed to ln(yz) using the product rule of logarithms.

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The correct choice is A. Using the cofactor expansion across the first row, the determinant of the given matrix is (2)(-13) - (-3)(-5) + (3)(7) = -26 + 15 + 21 = 10.

To compute the determinant using the cofactor expansion across the first row, we multiply each element of the first row by its cofactor and sum them up. The cofactor of an element is determined by taking the determinant of the submatrix obtained by removing the row and column containing that element, and then multiplying it by (-1) raised to the power of the sum of the row and column indices.

For the given matrix:

2  2  1

-3 1  4

3  3 -1

Expanding along the first row, we have:

Det = (2)(cofactor of 2) + (2)(cofactor of 2) + (1)(cofactor of 1)

    = (2)(-13) - (-3)(-5) + (3)(7)

    = -26 + 15 + 21

    = 10.

Therefore, the correct choice is A. The determinant of the matrix, using the cofactor expansion across the first row, is 10.

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The expected value of this discrete probability distribution is 2.93, and the variance is 1.21.

To find the expected value of the discrete probability distribution for this four-sided fair die, we use the formula:

E(X) = Σ(xi * Pi)

where xi represents the possible outcomes of the die, and Pi represents the probability of each outcome. In this case, the possible outcomes are 1, 2, 3, and 4, with probabilities of 9/30, 4/30, 7/30, and 10/30 respectively.

Therefore, the expected value of X is:

E(X) = (1 * 9/30) + (2 * 4/30) + (3 * 7/30) + (4 * 10/30) = 2.93

To find the variance, we first need to calculate the squared deviations of each outcome from the expected value, which is given by:

[tex](xi - E(X))^2 * Pi[/tex]

We then sum up these values to get the variance:

[tex]Var(X) = Σ[(xi - E(X))^2 * Pi][/tex]

This calculation gives a variance of approximately 1.21.

Therefore, the expected value of this discrete probability distribution is 2.93, and the variance is 1.21.

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False. A raster data model is not necessarily a better representation of reality compared to the vector model.

The statement is false. The choice between a raster data model and a vector data model depends on the specific use case and the nature of the data being represented. While raster data models are well-suited for representing continuous data, such as elevation or satellite imagery, they can be limited in accurately representing discrete objects, such as roads or buildings.

Vector data models, on the other hand, excel at representing discrete objects with precise boundaries and attributes. The accuracy and precision of points, lines, and polygons in a vector model make it a suitable choice for many applications, including cartography, urban planning, and transportation analysis. Ultimately, the choice between the two models depends on the specific requirements and characteristics of the data being represented.

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The solution to x' = jx using exp(jt) is x(t) = ce^(jt), where c is a constant.

We start by assuming that x(t) = ce^(jt), then taking its derivative we get x'(t) = c(j)e^(jt). We substitute these values into the equation x' = jx and get c(j)e^(jt) = jce^(jt). We can then divide both sides by ce^(jt) to get j = j, which is true. This means that our assumption of x(t) = ce^(jt) is valid, and the solution is x(t) = ce^(jt).

The exponential function e^(jt) is a complex-valued function that can be used to represent sinusoidal functions with angular frequency t. In this case, we use it to represent the solution to the differential equation x' = jx. By assuming that x(t) is of the form ce^(jt), we are essentially saying that the function x(t) is a sinusoidal function with angular frequency t, and that its amplitude is a constant c.

The solution to x' = jx using exp(jt) is x(t) = ce^(jt), where c is a constant. This solution represents a sinusoidal function with angular frequency t, and its amplitude is a constant c.

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a) For the sequence sin(1/n), as n -> infinity, 1/n -> 0, and sin(1/n) -> sin(0) = 0. Thus, the rate of convergence is O(1/n).

b) For the sequence sin(1/n^2), as n -> infinity, 1/n^2 -> 0, and sin(1/n^2) -> sin(0) = 0. Thus, the rate of convergence is O(1/n^2).

c) For the sequence (sin(1/n))^2, as n -> infinity, 1/n -> 0, and sin(1/n) -> sin(0) = 0. Thus, the rate of convergence is O(1/n^2).

d) For the sequence [ln(n+1) - ln(n)], we can use the mean value theorem to show that ln(n+1) - ln(n) = 1/(c_n+1) for some c_n between n and n+1. Thus, as n -> infinity, c_n -> infinity, and 1/(c_n+1) -> 0. Thus, the rate of convergence is O(1/n).

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A month has 4 weeks, Jose's earnings for a month would be $619.8

First, let's calculate how much Jose earns in a week:

Earnings per day = $10.33/hour * 3 hours/day = $30.99/day

Weekly earnings = $30.99/day * 5 days/week = $154.95/week

Now, let's calculate the monthly earnings by multiplying the weekly earnings by the number of weeks in a month:

Monthly earnings = $154.95/week * 4 weeks/month = $619.80/month

Therefore, Jose will have $619.80 at the end of the month if he works 3 hours a day, 5 days a week, at a rate of $10.33 per hour.

At the end of the month, Jose would have earned $619.8.

As  Jose works 3 hours a day, 5 days a week, at $10.33 an hour, he would earn:

$10.33 x 3 hours a day x 5 days a week= $154.95 per week.

Since a month has 4 weeks, Jose's earnings for a month would be:

4 weeks x $154.95 per week= $619.8

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when working with categorical data, a bar chart is the most appropriate choice to effectively communicate and compare the frequencies or proportions of different categories.

A bar chart is a visual representation of data using rectangular bars. It is commonly used to display and compare categorical data. Categorical data consists of distinct categories or groups that are not inherently ordered or measured numerically. Examples of categorical data include types of animals, colors, or survey responses (e.g., "Yes," "No," "Maybe").

In a bar chart, each category is represented by a separate bar, and the height of each bar corresponds to the frequency or count of observations in that category. The bars are typically arranged along the horizontal or vertical axis, making it easy to compare the frequencies or proportions of different categories.

On the other hand, numerical or continuous data refers to data that can be measured and represented on a continuous scale, such as height, temperature, or time. For such data, other types of charts, such as line graphs or histograms, may be more suitable for visualizing patterns, trends, or distributions.

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The equilibrium price and quantity of gasoline are $3.33 per gallon and 833.33 gallons respectively.

To find the equilibrium price and quantity, we need to set the demand equal to the supply:

5 - 0.002q = 0.2 + 0.004q

Solving for q, we get q = 833.33 gallons.

To find the equilibrium price, we can substitute q back into either the demand or supply equation. Using the demand equation, we get p = $3.33 per gallon.

Therefore, the equilibrium price and quantity of gasoline are $3.33 per gallon and 833.33 gallons respectively.

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Step-by-step explanation:

32.605    is it

When choosing between two unbiased estimators of a population parameter, the one with the lower standard deviation is generally preferred as it indicates that the estimator is more precise. The correct answer is option d.

In other words, the variance of the estimator is smaller, meaning that the estimator is less likely to deviate far from the true value of the population parameter.

An estimator with a larger standard deviation, on the other hand, is less precise and is more likely to produce estimates that are farther from the true value. Therefore, it is important to consider the variability of the estimators when choosing between them.

It is worth noting, however, that the standard deviation alone is not sufficient to fully compare and evaluate two estimators. Other properties such as bias, efficiency, and robustness must also be taken into account depending on the specific context and requirements of the problem at hand.

The correct answer is option d.

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The value of y' is found to be approximately 0.748 ft.

The specific energy, E, in open channel flow, can be calculated using the equation E = [tex]y + Q^2/(2gy^2)[/tex] where y is the depth of flow, Q is the flow rate, and g is the acceleration due to gravity.

In this case, Q = y * width * velocity = [tex]2 ft * 5 ft * 7.5 ft/s = 75 ft^3/s.[/tex]

Substituting these values in, the specific energy, E, is found to be E = 2 ft + (75 ft³/s)² / (2 * 32.2 ft/s² * (2 ft)²) = 3.466 ft.

The alternate depth, y', can be found by solving the equation 3.466 ft

= [tex]y' + (75 ft^3/s)^2 / (2 * 32.2 ft/s^2 * (y')^2) for y'.[/tex]

This is a quadratic equation and using the positive root for supercritical flow, y' is found to be approximately 0.748 ft.

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Answer:

130°

Step-by-step explanation:

BC = BD

BC + BD + DC = 360°

BC + BC + 100° = 360°

2BC = (360 - 100)°

2BC = 260°

BC = 260/2

BC = 130°

Answer:

130 degrees

Step-by-step explanation:

We already know that CD = 100.

We also know that all 3 arcs in this circumscribed circle have to equal 360.

So, let's write an equation and solve for BC:

BC+CD+BD=360

BC=BD

we know this because side lengths BC and BD are congruent

(BC+BD)+100=360

we can combine like terms and substitute in our known value of CD

BC+BD=260

subtract 100 from both sides

BC+BC=260

substitute in BC=BD

2BC=260

combine like terms

BC=130

divide both sides by 2 to get BC

This means that option C (130 degrees) is correct.  Hope this helps! :)

The average price per pound for all the coffee sold is $5.52 per pound, when 650 lb of coffee are sold when the price is $4 per pound, and 400 lb are sold at $8 per pound.

Suppose that 650 lb of coffee are sold when the price is $4 per pound, and 400 lb are sold at $8 per pound. We have to find the average price per pound for all the coffee sold.

Average price is equal to the total cost of coffee sold divided by the total number of pounds sold. We can use the following formula:

Average price per pound = (total revenue / total pounds sold)

In this case, the total revenue is the sum of the revenue from selling 650 pounds at $4 per pound and the revenue from selling 400 pounds at $8 per pound. That is:

total revenue = (650 lb * $4/lb) + (400 lb * $8/lb)

= $2600 + $3200

= $5800

The total pounds sold is simply the sum of 650 pounds and 400 pounds, which is 1050 pounds. That is:

total pounds sold = 650 lb + 400 lb

= 1050 lb

Using the formula above, we can calculate the average price per pound:

Average price per pound = total revenue / total pounds sold= $5800 / 1050

lb= $5.52 per pound

Therefore, the average price per pound for all the coffee sold is $5.52 per pound, when 650 lb of coffee are sold when the price is $4 per pound, and 400 lb are sold at $8 per pound.

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The answer is C. Not enough information to determine.

To understand which stock should have the highest expected return, we need more information about the stocks and the market. Standard deviation and beta are risk measures but do not directly provide information about expected return.
Standard deviation measures the dispersion of a stock's returns, with a higher standard deviation indicating greater volatility. Beta measures a stock's sensitivity to market movements, with a higher beta indicating greater responsiveness to market changes.
While risk and return are often positively correlated, meaning that higher risk investments typically offer higher potential returns, we cannot determine the expected return of these stocks based solely on their standard deviation and beta values. We would need additional information about the stocks, such as their historical returns or dividend yields, as well as the overall market conditions, to make an informed decision on which stock has the highest expected return.

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As the sample size (n) increases, the power of the statistical test also increases.

The power of a statistical test measures the ability of the test to detect a true effect or reject a false null hypothesis. In this case, the investigator states that the power of his test at a significance level of 1% is 0.87. If the sample size (n) increases, the power of the test increases.

Increasing the sample size generally leads to an increase in the power of a statistical test. This is because a larger sample size provides more information and reduces the variability in the data. With a larger sample size, the test has a greater chance of detecting a true effect and rejecting the null hypothesis when it is false. Consequently, the power of the test increases.

In summary, as the sample size (n) increases, the power of the statistical test also increases. This is because a larger sample size enhances the test's ability to detect true effects and reject false null hypotheses, resulting in higher statistical power. Therefore, in this scenario, increasing the sample size would lead to an increase in the power of the test.

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The correct option is the third one, the explicit formula for the sequence is:

aₙ = 52 - 5n

Here we have what it seems to be an arithmetic sequence:

47, 42, 37, 32, ...

We can see that the difference between each pair of consecutive terms is -5, so that is the common difference of the sequence:

42 - 47 = -5

37 - 42 = -5

32 - 37 = -5

Then the explicit formula for the arithmetic sequence is:

aₙ = a₁ + (n - 1)*d

Where a₁ is the initial value, and d is the common difference.

So the explicit formula is:

aₙ = 47 + (n - 1)*(-5)

We can simplify this to get:

aₙ = 47  - 5n + 5

aₙ = 52 - 5n

The correct option is the third one.

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The degrees of freedom for the test is (5, 48). The p-value for this F-statistic can be obtained from an F-distribution table or calculator with the appropriate degrees of freedom.

The degrees of freedom for the regression is 5 and the sum of squares for the regression is 4,001.11. Therefore, the mean square for the regression is:

MS(regression) = SS(regression) / DF(regression) = 4,001.11 / 5 = 800.22

The degrees of freedom for the residual is 48 and the sum of squares for the residual is 2,610.04. Therefore, the mean square for the residual is:

MS(residual) = SS(residual) / DF(residual) = 2,610.04 / 48 = 54.38

The F-statistic for testing the null hypothesis that all the regression coefficients are zero is:

F = MS(regression) / MS(residual) = 800.22 / 54.38 = 14.72

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Seriyah can claim $14,710 as a deduction on her medical expenses.

To calculate the amount that Seriyah can claim as a medical deduction, we need to determine the threshold for deductibility based on the IRS rules. The threshold is 7.5% of Seriyah's adjusted gross income (AGI).

7.5% of Seriyah's AGI = 7.5% * $42,300 = $3,172.50

Since Seriyah's medical expenses of $21,560 exceed the threshold, she can claim the amount that exceeds the threshold as a deduction.

Amount exceeding the threshold = Medical expenses - Threshold

                          = $21,560 - $3,172.50

                          = $18,387.50

Now, we need to calculate 80% of the amount exceeding the threshold, which is covered by her medical insurance.

Insurance coverage = 80% * $18,387.50

                 = $14,710

Therefore, Seriyah can claim $14,710 as a deduction on her medical expenses.

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The dimensions that require the minimum amount of material for the open-top box are:

Length = 8 inches, Width = 8 inches, Height = 4 inches.

To find the dimensions that minimize the amount of material needed, we can approach the problem by using calculus and optimization techniques. Let's denote the length of the square bottom as "x" inches and the height of the box as "h" inches. Since the volume of the box is given as 256 cubic inches, we have the equation:

Volume = Length × Width × Height = x² × h = 256.

To minimize the material used, we need to minimize the surface area of the box. The surface area consists of the bottom area (x²) and the combined areas of the four sides (4xh). Therefore, the total surface area (A) is given by the equation:

A = x² + 4xh.

We can solve for h in terms of x using the volume equation:

h = 256 / (x²).

Substituting this expression for h in terms of x into the surface area equation, we get:

A = x² + 4x(256 / (x²)).

Simplifying further, we obtain:

A = x² + 1024 / x.

To minimize A, we take the derivative of A with respect to x, set it equal to zero, and solve for x:

dA/dx = 2x - 1024 / x² = 0.

Solving this equation yields x = 8 inches. Plugging this value back into the equation for h, we find h = 4 inches.

Therefore, the dimensions that require the minimum amount of material are: Length = 8 inches, Width = 8 inches, and Height = 4 inches.

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The given series ∑ [tex](3n(4n^2))^2[/tex] converges.

To determine whether the series converges or diverges, we can use the limit comparison test.

The given series is ∑ [tex](3n(4n^2))^2[/tex], where n starts from 1 and goes to infinity.

Let's simplify the series first:

[tex](3n(4n^2))^2 = 9n^2 * 16n^4 = 144n^6[/tex]

Now, let's consider the series ∑ [tex]144n^6.[/tex]

To apply the limit comparison test, we need to find a known series ∑ [tex]b_n[/tex]that converges/diverges and has positive terms.

We can compare it with the series ∑ [tex]n^6.[/tex]

Taking the limit of the ratio of the nth terms of the two series, we have:

lim (n → ∞)[tex](144n^6 / n^6)[/tex] = 144

Since the limit is a finite positive number (144), we can conclude that if the series ∑ [tex]n^6[/tex] converges, then the series ∑[tex]144n^6[/tex] also converges. Similarly, if ∑ [tex]n^6[/tex] diverges, then ∑ [tex]144n^6[/tex] also diverges.

Now, we know that the series ∑ [tex]n^6[/tex] converges (it is a p-series with p = 6 > 1), therefore, by the limit comparison test, the series ∑ [tex]144n^6[/tex] also converges.

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(a) (i) For all printers P, if printer P is out of service or busy, then all print jobs are lost. (ii) There exists a print job J such that if job J is lost, then all printers are out of service. (iii) For all print jobs J, if job J is queued, then there exists a printer P that is out of service.

(b) To show they are not equivalent, we can construct a truth table and find that there is a row where they have different truth values.

(a) (i) For all printers p, if printer p is out of service or printer p is busy, then print job j is lost.

(ii) There exists a print job j such that if print job j is lost, then printer p is out of service and printer q is busy.

(iii) For all print jobs j, if print job j is queued, then there exists a printer p such that printer p is out of service.

(b) To show that ‘v’r(P(.r)) V ‘v’r(Q(Qm( ))) and ‘v’$(P($) V (2(a)) are not logically equivalent, we can construct a truth table for both statements and find that there is at least one row where the truth values differ.

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