Child and adult tickets are sold for a concert. Child tickets are $3 and adult tickets are $5. 56 total tickets were purchased, and $200 was earned. How many child tickets were sold?

The amount invested in CDs is $24,500 and the amount invested in bonds is $25,500.

Let's represent the amount invested in CDs as "x".

Given that the amount invested in bonds is to exceed that in CDs by $1,000.

Therefore, the amount invested in bonds is "x + $1,000".

The sum of the amounts invested in CDs and bonds is equal to $50,000.x + (x + $1,000)

= $50,0002x + $1,000 = $50,0002x = $50,000 - $1,0002x = $49,000x = $24,500.

Therefore, the amount invested in CDs is $24,500 and the amount invested in bonds is $25,500 (x + $1,000).

Thus, the amount invested in CDs is $24,500 and the amount invested in bonds is $25,500.

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a) To sketch the graph of the density function, we can use the exponential distribution formula: f(x) = λ * e^(-λx). Given λ = 0.04, the formula becomes f(x) = 0.04 * e^(-0.04x). On the x-axis, plot the time to failure (x), and on the y-axis, plot the density function (f(x)). As x increases, f(x) decreases exponentially.

b) To find the proportion of fans that will last at least 200 hours, we need to calculate the cumulative distribution function (CDF). The CDF is given by F(x) = 1 - e^(-λx). Substituting λ = 0.04 and x = 200, we get F(200) = 1 - e^(-0.04 * 200). This will give us the proportion of fans that last at least 200 hours.

c) To determine the lifetime of a fan to place it among the best 5% of all fans, we need to find the value of x such that the cumulative distribution function (CDF) is equal to 0.95. We can rearrange the CDF formula as follows: 0.95 = 1 - e^(-λx). Solve for x by taking the natural logarithm on both sides and rearranging the equation to get x = ln(0.05) / (-λ). Substituting λ = 0.04 into the equation will give us the lifetime of a fan to be among the best 5% of all fans.

In conclusion, a) sketch the graph of the density function, b) calculate the proportion of fans that will last at least 200 hours using the CDF formula, and c) determine the lifetime of a fan to place it among the best 5% of all fans using the CDF formula and the given λ value.

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The probability of having a z-score greater than -1.58 is 0.9429 or 94.29% (rounded to four decimal places).

To find the probability using the standard normal distribution of P(z>−1.58), it is necessary to first refer to the z-table. From the table, we can determine the probability associated with a given z-value. Since we want to find P(z>−1.58), we need to look up the value of -1.58 in the table.

Here's how to do it:

Step 1: Look up the closest value to -1.58 in the first column of the table, which is -1.5.

Then, look up the value in the second column of the table that corresponds to the hundredths digit of -1.58, which is 0.08. Intersect the row and column to find the z-value of -1.58. The value is 0.0571.

Step 2: Since P(z>−1.58) means the probability of having a z-score greater than -1.58, we need to subtract the value from 1 (since the total probability of a normal distribution is always equal to 1). P(z>−1.58) = 1 - 0.0571= 0.9429

Therefore, the probability of having a z-score greater than -1.58 is 0.9429 or 94.29% (rounded to four decimal places).

In conclusion, the probability of having a z-score greater than -1.58 is 0.9429 or 94.29% (rounded to four decimal places).

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A. Class 1: {0,1,2}Class 2: {3,4,5}

B.  it is recurrent.

Using the definition of communication classes, we can see that states {0,1,2} form a class since they communicate with each other but not with any other state. Similarly, states {3,4,5} form another class since they communicate with each other but not with any other state.

Therefore, the classes are:

Class 1: {0,1,2}

Class 2: {3,4,5}

(b)

Within Class 1, all states communicate with each other so it is a closed communicating class. Therefore, it is recurrent.

Within Class 2, all states communicate with each other so it is a closed communicating class. Therefore, it is recurrent.

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The percentage of men meeting the height requirement is approximately 85.72%, calculated using the z-score. The minimum height requirement is 57 inches, while the maximum height requirement is 63 inches. The probability of a randomly selected man's height falling within the range is approximately 0.8572, indicating a higher percentage of men meeting the height requirement compared to women. However, determining the gender ratio of employed characters requires a more comprehensive analysis of employment data.

Part (a):

To find the percentage of men who meet the height requirement, we can use the given information:

Mean height for men (μ1) = 67.6 in.

Standard deviation for men (σ1) = 3.1 in.

Minimum height requirement (hmin) = 57 in.

Maximum height requirement (hmax) = 63 in.

We need to calculate the probability that a randomly selected man's height falls within the range of 57 in to 63 in. This can be done using the z-score.

The z-score is given by:

z = (x - μ) / σ

For the minimum height requirement:

z1 = (hmin - μ1) / σ1 = (57 - 67.6) / 3.1 ≈ -3.39

For the maximum height requirement:

z2 = (hmax - μ1) / σ1 = (63 - 67.6) / 3.1 ≈ -1.48

Using a standard normal table, we find the probability that z lies between -3.39 and -1.48 to be approximately 0.8572.

Therefore, the percentage of men who meet the height requirement is approximately 85.72%.

Part (b):

Based on the calculation in part (a), we can conclude that a higher percentage of men meet the height requirement compared to women. This suggests that the amusement park may employ more male characters than female characters. However, without further information, we cannot determine the gender ratio of the employed characters. A more comprehensive analysis of employment data would be necessary to draw such conclusions.

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A recursive definition for the function called "duplicate" that takes a list as a parameter and returns a new list in which each element of the original list is duplicated can be defined as follows:

- If the input list is empty, the output list is also empty.

- If the input list is not empty, the output list is obtained by first duplicating the first element of the input list and then recursively applying the "duplicate" function to the rest of the input list.

More formally, the recursive definition for the "duplicate" function can be expressed as follows:

- duplicate([]) = []

- duplicate([x] + L) = [x, x] + duplicate(L)

- duplicate([x1, x2, ..., xn]) = [x1, x1] + duplicate([x2, x3, ..., xn])

This definition can be read as follows: if the input list is empty, the output list is also empty; otherwise, the output list is obtained by duplicating the first element of the input list and then recursively applying the "duplicate" function to the rest of the input list.

In summary, the recursive definition for the "duplicate" function takes a list as a parameter and returns a new list in which each element of the original list is duplicated.

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lambert's cylindrical projection preserves the relative size of geographic features. this type of projection is called equivalent.

cylindrical projection, in cartography, any of numerous map projections of the terrestrial sphere on the surface of a cylinder that is then unrolled as a plane.

Originally, this and other map projections were achieved by a systematic method of drawing the Earth's meridians and latitudes on the flat surface.

Mercator projection is defined as a map projection was found in 1569 by Flemish cartographer Gerardus Mercator.

The Mercator projection seems parallels around a cylindrical globe and meridians appears as straight lines, but there is distortion of scale near the poles which do not make it a practical world map.

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The statements are: True, True, False, False, False.

1. The statement f(2) = 5 is true if the function f evaluates to 5 when the input is [tex]2[/tex].

2. The statement f(-6) - f(-3) = 6 is true if the difference between the values of f at -6 and -3 is 6.

3. The domain refers to the set of all possible input values for the function. The statement that the domain is (-6,2] is false because it should include all real numbers from -6 to 2, including -6 and 2. The correct notation would be [-6,2].

4. The statement f(-1) = -3 is false if the value of the function at -1 is not equal to -3.

5. The range refers to the set of all possible output values of the function. The statement that the range is [-1,5) is false if there is at least one value outside of that interval included in the range.

To determine the truth or falsehood of these statements, you would need the specific function definition or additional information about the function's behavior.

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Answer:

4.32 francs

Step-by-step explanation:

45p × £/(100p) × 9.6 francs / £ = 4.32 francs

Sensitivity is the ability of a test to identify accurately those with the condition that is being tested for. On the other hand, specificity is the ability of a test to identify accurately those without the condition that is being tested for.

In other words, sensitivity measures how well a test identifies true positives, while specificity measures how well a test identifies true negatives. Both sensitivity and specificity are important for measurement instruments, but the importance of each one depends on the specific context. For example, in medical testing, sensitivity is often more important than specificity because a false negative result (i.e., a result that incorrectly indicates the absence of a condition when the person actually has it) can be dangerous or even life-threatening. However, false positive results (i.e., results that incorrectly indicate the presence of a condition when the person actually does not have it) can also be harmful, as they can lead to unnecessary further testing, treatments, or interventions that can carry risks, costs, and psychological distress. In conclusion, both sensitivity and specificity are crucial for accurate measurement and interpretation of test results. The relative importance of each one depends on the specific context and the potential consequences of false positives and false negatives.

Therefore, the choice of a measurement instrument should consider both sensitivity and specificity, as well as other relevant factors such as reliability, validity, feasibility, cost, and acceptability.

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The incidence rate per 100,000 for pertussis in the United States in 2013 was approximately 9.05. This rate provides a standardized measure of new pertussis cases in relation to the population size and allows for comparisons between different populations or time periods.

The major assumption for using incidence rate (IR) is that the population at risk remains constant throughout the calculation period. This means that there are no significant changes in the size or composition of the population during the time frame being analyzed.

Properties of incidence rate include:

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Therefore, the area of triangle ABC is 8 * √(93) square units.

To find the area of triangle ABC with vertices A(1, 2, 3), B(2, 5, 7), and C(-10, 1, 3), we can use the formula for the area of a triangle in three-dimensional space.

Let's denote the vectors AB and AC as vector u and vector v, respectively:

u = B - A

= (2-1, 5-2, 7-3)

= (1, 3, 4)

v = C - A

= (-10-1, 1-2, 3-3)

= (-11, -1, 0)

The cross product of vectors u and v will give us a vector that is orthogonal (perpendicular) to the plane of the triangle. The magnitude of this cross product vector will give us the area of the triangle.

To find the cross product, we compute:

u x v = (30 - 4(-1), 4*(-11) - 10, 1(-1) - 3*(-11))

= (4, -44, 32)

The magnitude of this vector is:

|u x v| = √[tex](4^2 + (-44)^2 + 32^2)[/tex]

= √(16 + 1936 + 1024)

= √(2976)

= 8 * √(93)

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The final answer to this question is option B, which states that the correlation coefficient measures the extent to which changes in one factor are related to changes in a second factor.

The correlation coefficient is a statistical measure that indicates the strength and direction of the linear relationship between two variables. It ranges from -1 to +1, where a value of -1 indicates a perfect negative correlation, a value of +1 indicates a perfect positive correlation, and a value of 0 indicates no correlation at all.

Therefore, when the correlation coefficient is positive, it indicates that an increase in one variable is associated with an increase in the other variable, whereas a negative correlation indicates that an increase in one variable is associated with a decrease in the other variable. In other words, changes in one variable are related to changes in the other variable.

Hence, we can conclude that the correlation coefficient is a useful tool for analyzing the relationship between two variables, and it provides valuable insights into how changes in one variable affect changes in the other variable.

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The given function is: f(x)= arc sin(11 x²+√3) We have to find its derivative, which is represented as f'(x). Hence, we will find the derivative of f(x).

We know that

d/dx(sin(x)) = cos(x) And,

d/dx(cos(x)) = -sin(x)

Let us differentiate the given function f(x) using the chain rule as shown below. f(x)= arc sin(11 x²+√3)

Let u = 11x²+√3u'

= 22x

Let y = arc sin(u) dy/du

= 1/√(1-u²)

(Differentiation of arc sin(u) with respect to u)f(x) = y

= arc sin(11x²+√3) Using chain rule

f'(x) = dy/dx

= dy/du * du/dx

We have dy/du and du/dx values dy/du = 1/√(1-u²)

= 1/√(1 - (11x²+√3)²)

(Substituting u value)du/dx = 22x

Now, using the above values in dy/dx, we get f'(x) = dy/dx

= dy/du * du/dx

= 1/√(1 - (11x²+√3)²) * 22x

f'(x) = 1/√(1 - (11x²+√3)²) * 22x

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The equation ln(x) ≤ x-1 is true for all x > 0. This means that the natural logarithm of x is always less than or equal to x-1 for positive values of x. Therefore, stationary point is x = 1.

To find the stationary point, we need to find the value of x for which the derivative of the function is equal to zero. Let's calculate the derivative of f(x) with respect to x:

f'(x) = d/dx (ln(x) - (x-1))

     = (1/x) - 1

Setting f'(x) equal to zero and solving for x:

(1/x) - 1 = 0

1/x = 1

x = 1

So, x = 1 is the only stationary point of the function.

To show that ln(x) ≤ x-1 for all x > 0, we need to analyze the behavior of f(x) around the stationary point. We can observe that the function approaches negative infinity as x approaches zero and approaches positive infinity as x approaches infinity. Moreover, since x = 1 is a stationary point, the function will change its behavior from decreasing to increasing at this point.

From the analysis above, we can conclude that ln(x) ≤ x-1 for all x > 0. This means that the natural logarithm of x is always less than or equal to x-1 for positive values of x.

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1. Examples of natural numbers that satisfy the given conditions are as follows:

Let a = 6, b = 2, and c = 3. In this case, a divides the product of b and c, as 6 divides 2 × 3 = 6. However, a is not divisible by b, as 6 is not divisible by 2. Additionally, a is not divisible by c, as 6 is not divisible by 3.

Another example is a = 10, b = 5, and c = 2. Again, a divides the product of b and c, as 10 divides 5 × 2 = 10. However, a is not divisible by b, as 10 is not divisible by 5. Similarly, a is not divisible by c, as 10 is not divisible by 2.

These examples demonstrate situations where a divides the product of b and c but does not divide either b or c individually.

2. Euclid's proof of the infinitude of prime numbers is as follows:

Euclid's proof begins by assuming the contrary, i.e., that there are only finitely many prime numbers. Let's assume the set of prime numbers as P and represent them as p₁, p₂, p₃, ..., pₙ.

Next, Euclid considers a new number q, which is equal to the product of all prime numbers in set P, plus one: q = (p₁ × p₂ × p₃ × ... × pₙ) + 1.

Now, q can either be a prime number itself or a composite number. If q is prime, then it is a prime number that is not included in the initial set of primes P, contradicting our assumption that the set of primes is finite.

On the other hand, if q is composite, it must have a prime factor. This prime factor cannot be any of the primes in set P because q leaves a remainder of 1 when divided by any prime number in P. Therefore, this prime factor must be a new prime number that is not in the initial set P, again contradicting our assumption that the set of primes is finite.

In either case, we arrive at a contradiction, proving that there must be an infinite number of prime numbers.

Euclid's proof shows that no matter how many prime numbers we have, we can always construct a new number that is either prime or has a prime factor not present in the initial set. This demonstrates the infinite nature of prime numbers.

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(a) A can be represented using set notation as A = {x | x ∈ ℕ, 107 < x < 108}. In set notation, we can define set A as the set of natural numbers (denoted by the symbol ℕ) that are greater than 107 and smaller than 108.

In set notation, we use curly braces {} to define a set. The vertical bar | is read as "such that" and is used to specify the condition or properties that elements of the set must satisfy.

The notation "x ∈ ℕ" indicates that x is an element belonging to the set of natural numbers. The colon ":" separates the variable x from the condition that defines the elements of the set.

In this case, the condition is "107 < x < 108," which specifies that x must be greater than 107 and smaller than 108. A is the set of natural numbers (denoted by the symbol ℕ) that are greater than 107 and smaller than 108.

The set A can be described as the set of natural numbers greater than 107 and smaller than 108. Its members are the natural numbers 108, 109, 110, ..., up to but not including 108, where the range extends up to the largest possible natural number, which is 2147483647.

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The coefficient of the third term in the polynomial is 0, and the constant term is 0.

The third term in the polynomial is a, which means that it has a coefficient of 1. Therefore, the coefficient of the third term is 1. However, when we look at the entire polynomial, we can see that there is no constant term. This means that the value of the polynomial when a is equal to 0 is also 0, since there is no constant term to provide a non-zero value.

To find the coefficient of the third term, we simply need to look at the coefficient of the term with a degree of 1. In this case, that term is a, which has a coefficient of 1. Therefore, the coefficient of the third term is 1.

To find the constant term, we need to evaluate the polynomial when a is equal to 0. When we do this, we get:

(1)/(2)(0)^(4) + 3(0)^(3) + 0 = 0

Since the value of the polynomial when a is equal to 0 is 0, we know that there is no constant term in the polynomial. Therefore, the constant term is 0.

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The characters in increasing order of asymptotic growth (big-O notation) are: 5, x⁴, 60n² + 5n + 1.

To sort the characters below in increasing order of asymptotic growth (big-O notation):

x⁴, 5, 60n² + 5n + 1

The correct order is:

1. 5 (constant time complexity, O(1))

2. x⁴ (polynomial time complexity, O(x⁴))

3. 60n² + 5n + 1 (quadratic time complexity, O(n²))

Therefore, the characters are sorted in increasing order of asymptotic growth as follows: 5, x⁴, 60n² + 5n + 1.

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Using the formula of the sum of a geometric progression, we get:

E[N] = q/(1-q)^2Var[N] = q(1+q)/(1-q)^3

Given an integer-valued random variable, N, which has a distribution such that

P[N ≥ n] = (1-q)^(n-1) for n ≥ 1.

The task is to find out E[N] and Var[N].

E[N] Expectation or mean of random variable N is given by E[N] = Σ n * P[N = n] where Σ is the summation sign.

Using P[N = n] = P[N ≥ n] - P[N ≥ n+1], we getE[N] = Σ n * [P[N ≥ n] - P[N ≥ n+1]]

Now, P[N ≥ n+1] = (1-q)^n

Using the formula of the sum of a geometric progression, we get:

P[N ≥ n] = Σ P[N ≥ k] = Σ (1-q)^(k-1) = 1/qE[N] = Σ n * [P[N ≥ n] - P[N ≥ n+1]] = Σ n * [(1/q) - (1-q)^n]

Now, 0 < q < 1;

therefore, q^n → 0 as n → ∞

So, we have E[N] = q/(1-q)^2 Var[N]

To calculate Var[N], we will first find E[N^2]

E[N^2]: Expectation of N^2 is given by E[N^2] = Σ n^2 * P[N = n]

Using P[N = n] = P[N ≥ n] - P[N ≥ n+1], we get

E[N^2] = Σ n^2 * [P[N ≥ n] - P[N ≥ n+1]]Now, P[N ≥ n+1] = (1-q)^n

Using the formula of the sum of a geometric progression, we get:

P[N ≥ n] = Σ P[N ≥ k] = Σ (1-q)^(k-1) = 1/qE[N^2] = Σ n^2 * [P[N ≥ n] - P[N ≥ n+1]] = Σ n^2 * [(1/q) - (1-q)^n]

Now, we have E[N^2] = q(2-q)/(1-q)^3

Var[N]: Variance of N is given by Var[N] = E[N^2] - (E[N])^2

Therefore, Var[N] = E[N^2] - (E[N])^2= q(2-q)/(1-q)^3 - [q/(1-q)^2]^2= q(1+q)/(1-q)^3

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The student must score 74 on the fourth test to have an average of 80 for all four tests, The equation can be formed by considering the average of the four tests,

To find the grade the student must make on the fourth test to achieve an average of 80 for all four tests, we can set up an algebraic equation. Let the unknown grade on the fourth test be represented by "x."

The equation can be formed by considering the average of the four tests, which is obtained by summing up all the grades and dividing by 4. By rearranging the equation and solving for "x," we can determine that the student needs to score 84 on the fourth test to achieve an average of 80 for all four tests.

Let's denote the unknown grade on the fourth test as "x." The average of all four tests can be calculated by summing up the grades and dividing by the total number of tests, which is 4.

In this case, the sum of the first three grades is 70 + 82 + 94 = 246. So, the equation representing the average is (70 + 82 + 94 + x) / 4 = 80.

To solve this equation, we can begin by multiplying both sides of the equation by 4 to eliminate the fraction: 70 + 82 + 94 + x = 320. Next, we can simplify the equation by adding up the known grades: 246 + x = 320.

To isolate "x," we can subtract 246 from both sides of the equation: x = 320 - 246. Simplifying further, we have x = 74.

Therefore, the student must score 74 on the fourth test to have an average of 80 for all four tests.

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If the points are (1, −2, 1), (0, 5, 3) and (2, 4, 7), then the parametric form for the plane is -40x-8y+43z=-11 and the normal form ax+by+cd=d for the plane is -40x-8y+43z=65.

a) To find the parametric form of the plane, follow these steps:

b) To find the normal form, follow these steps:

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Two examples of discrete structures are: a) Graphs: Graphs consist of a set of vertices (nodes) connected by edges (lines). They are used to represent relationships between objects or entities. b) Sets: Sets are collections of distinct elements. They can be finite or infinite and are often used to represent groups or collections of objects.

Argument: An argument is a collection of statements where some statements (called premises) are presented as evidence or reasons to support another statement (called the conclusion).

Argument form: An argument form is a pattern or structure that represents a general type of argument, disregarding the specific content of the statements.

Statement: A statement is a declarative sentence that is either true or false, and it makes a claim or expresses a proposition.

Statement form: Statement form refers to the structure of a statement, abstracting away from its specific content and variables, if any.

Logical consequence: Logical consequence refers to the relationship between a set of premises and a conclusion. If the truth of the premises guarantees the truth of the conclusion, then the conclusion is said to be a logical consequence of the premises.

Opinion on logical consequence:

Logical consequence plays a crucial role in reasoning and evaluating arguments. It helps us understand the logical relationships between statements and determine the validity of arguments. In my opinion, logical consequence provides a systematic and rigorous framework for analyzing and assessing the validity and soundness of arguments. By identifying logical consequences, we can determine whether an argument is valid (i.e., the conclusion follows logically from the premises) or invalid.

It helps in making well-reasoned and justified conclusions based on logical relationships rather than personal biases or opinions. Logical consequence serves as a foundation for logical reasoning and critical thinking, enabling us to construct and evaluate logical arguments in various domains.

It provides a common language and method for analyzing arguments, allowing for clear communication and effective reasoning. Overall, understanding logical consequence is essential for developing sound arguments, evaluating information, and making rational decisions.

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Option A: 0.1 is incorrect. Option B: 0.09 is incorrect. Option C: 0.009 is incorrect. Option D: 0.001 is incorrect. The correct answer is 0.71.

Suppose that in a specific population, the average age is usually distributed with a mean of 40 and standard deviation of 36. The retirement age is 65. We are required to find out the probability that an individual, who is randomly chosen, will be within retiring age in 5 years.Let us begin by calculating the z-score.z = (x-μ)/σWhere, μ = 40, σ = 36 and x = 65 - 5 = 60.z = (60 - 40)/36z = 0.5556Using the Z table, we can obtain the probability associated with the z-score.

The area under the normal distribution curve between the mean and the z-score equals the required probability.P(z < 0.5556) = 0.7099Therefore, the probability that a randomly selected individual will be within retiring age in 5 years is 0.7099 or 0.71 (rounded to two decimal places).

Therefore, option A: 0.1 is incorrect. Option B: 0.09 is incorrect. Option C: 0.009 is incorrect. Option D: 0.001 is incorrect. The correct answer is 0.71.

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The best answer to represent a numerical description of a population characteristic is parameter. A parameter is a measurable characteristic of a statistical population, such as a mean or standard deviation.

A parameter can be thought of as a numerical description of a population characteristic. A parameter is a measurable characteristic of a statistical population. Parameters can be described using the sample data and statistical models. A parameter describes the population, whereas a statistic describes a sample. Parameters are calculated from populations, whereas statistics are calculated from samples.A population parameter refers to a numerical characteristic of a population. In statistical terms, a parameter is a fixed number that describes the population being studied. For example, if a researcher was studying a population of people and wanted to know the average height of that population, the parameter would be the population mean height.The parameter provides a better representation of a population than a statistic. A statistic is a numerical summary of a sample, while a parameter is a numerical summary of a population. Since a population parameter is a fixed number, it provides a more accurate representation of a population than a sample statistic.

In conclusion, a parameter is the best representation of a numerical description of a population characteristic. Parameters describe populations, while statistics describe samples. Parameters provide a more accurate representation of populations than statistics.

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The cutoff value for the lowest 0.15% of prices is $134.57.

a) To find the cutoff value that separates the lowest 0.15% of prices, we need to find the z-score such that the area to the left of it is 0.0015. Using the 99.7% rule, we know that this z-score will be less than -3. Therefore, we can use a z-score table to find that the closest z-score is -3.44.

Using the formula for standardizing a normal distribution, we have:

z = (x - mu) / sigma

where x is the cutoff value we want to find, mu is the mean, and sigma is the standard deviation. Solving for x, we get:

x = z * sigma + mu

= -3.44 * 3.86 + 148.28

= $134.57

Therefore, the cutoff value for the lowest 0.15% of prices is $134.57.

(Note: The answer was rounded to the nearest cent as requested in the question.)

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The solution to the given system of linear differential equations after transforming them to second order linear differential equation and solving is given as x(t) = c₁e^((-1+2√2)t) + c₂e^((-1-2√2)t) and y(t) = c₃e^(√47t) + c₄e^(-√47t)

Given system of linear differential equations is

x′=4x−3y     ...(1)

y′=6x−7y     ...(2)

Differentiating equation (1) w.r.t x, we get

x′′=4x′−3y′

On substituting the given value of x′ from equation (1) and y′ from equation (2), we get:

x′′=4(4x-3y)-3(6x-7y)

=16x-12y-18x+21y

=16x-12y-18x+21y

= -2x+9y

On rearranging, we get the required second order linear differential equation:

x′′+2x′-9x=0

The characteristic equation is given as:

r² + 2r - 9 = 0

On solving, we get:
r = -1 ± 2√2

So, the general solution of the given second order linear differential equation is:

x(t) = c₁e^((-1+2√2)t) + c₂e^((-1-2√2)t)

Now, to solve the given system of linear differential equations, we need to solve for x and y individually.Substituting the value of x from equation (1) in equation (2), we get:

y′=6x−7y

=> y′=6( x′+3y )-7y

=> y′=6x′+18y-7y

=> y′=6x′+11y

On substituting the value of x′ from equation (1), we get:

y′=6(4x-3y)+11y

=> y′=24x-17y

Differentiating the above equation w.r.t x, we get:

y′′=24x′-17y′

On substituting the value of x′ and y′ from equations (1) and (2) respectively, we get:

y′′=24(4x-3y)-17(6x-7y)

=> y′′=96x-72y-102x+119y

=> y′′= -6x+47y

On rearranging, we get the required second order linear differential equation:

y′′+6x-47y=0

The characteristic equation is given as:

r² - 47 = 0

On solving, we get:

r = ±√47

So, the general solution of the given second order linear differential equation is:

y(t) = c₃e^(√47t) + c₄e^(-√47t)

Hence, the solution to the given system of linear differential equations after transforming them to second order linear differential equation and solving is given as:

x(t) = c₁e^((-1+2√2)t) + c₂e^((-1-2√2)t)

y(t) = c₃e^(√47t) + c₄e^(-√47t)

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The maximum torsional shear stress that would develop in a solid circular shaft is 20.24 psi.

To find the maximum torsional shear stress that would develop in a solid circular shaft, having a diameter of 1.25 in, if it is transmitting 125 hp while rotating at 525 rpm, it is explained below:  Given data: Diameter of the shaft (d) = 1.25 in Power transmitted (P) = 125 HP Rotational speed (N) = 525 rpm. The formula used: Torsional shear stress(τ) = (16/π)d³PN. Where, d = Diameter of the shaft P = Power transmitted N = Rotational speedπ = 3.14Substitute the values in the above formula to find the maximum torsional shear stress.τ = (16/π) d³PNτ = (16/3.14) x (1.25)³ x (125) / 525τ = 20.24 psi. Hence, the maximum torsional shear stress that would develop in a solid circular shaft is 20.24 psi.

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Answer:

3x + 4y = 3

2x - 4y = 12

----------------

5x = 15

x = 3

3(3) + 4y = 3

9 + 4y = 3

4y = -6

y = -1.5