find the general solution of the differential equation y⁽⁴⁾ + 18y'' + 81y = 0
y(t) =

Answers

Answer 1

The real and imaginary parts to obtain the general solution y(t) = A cos(3t) + B sin(3t).

To find the general solution of the differential equation y⁽⁴⁾ + 18y'' + 81y = 0, we can use the characteristic equation method.

The characteristic equation is obtained by assuming the solution of the form y(t) = e^(rt), where r is a constant. Substituting this into the differential equation, we get:

r⁴e^(rt) + 18r²e^(rt) + 81e^(rt) = 0

Factoring out e^(rt), we have:

e^(rt)(r⁴ + 18r² + 81) = 0

For the equation to hold for all t, the term in the parentheses must be equal to zero:

r⁴ + 18r² + 81 = 0

This is a quadratic equation in r². Let's solve it:

(r² + 9)² = 0

Taking the square root of both sides:

r² + 9 = 0

r² = -9

r = ±√(-9)

Since the square root of a negative number is imaginary, we have complex roots:

r₁ = 3i

r₂ = -3i

The general solution of the differential equation is given by:

y(t) = c₁e^(3it) + c₂e^(-3it)

Using Euler's formula (e^(ix) = cos(x) + isin(x)), we can rewrite the general solution in terms of trigonometric functions:

y(t) = c₁(cos(3t) + isin(3t)) + c₂(cos(-3t) + isin(-3t))

Simplifying, we get:

y(t) = c₁(cos(3t) + isin(3t)) + c₂(cos(3t) - isin(3t))

y(t) = (c₁ + c₂)cos(3t) + i(c₁ - c₂)sin(3t)

Finally, we can combine the real and imaginary parts to obtain the general solution:

y(t) = A cos(3t) + B sin(3t)

where A = c₁ + c₂ and B = i(c₁ - c₂) are constants determined by initial conditions or boundary conditions.

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Related Questions

the waiting time at an elevator is uniformly distributed between 30 and 200 seconds. what is the probability a rider must wait between 1 minute and 1.4 minutes?

Answers

The probability that a rider must wait between 1 minute and 1.4 minutes at the elevator can be determined by calculating the proportion of the uniform distribution that falls within this time interval.

The given information states that the waiting time at the elevator follows a uniform distribution between 30 and 200 seconds. To find the probability of waiting between 1 minute and 1.4 minutes, we need to convert these time values to seconds.

1 minute is equal to 60 seconds, and 1.4 minutes is equal to 84 seconds. Therefore, we are interested in finding the probability that the waiting time falls between 60 seconds and 84 seconds.

Since the waiting time follows a uniform distribution, the probability of waiting within a specific interval is equal to the length of that interval divided by the total length of the distribution.

The total length of the distribution is 200 seconds - 30 seconds = 170 seconds.

The length of the interval between 60 seconds and 84 seconds is 84 seconds - 60 seconds = 24 seconds.

Thus, the probability that a rider must wait between 1 minute and 1.4 minutes is 24 seconds / 170 seconds, which is approximately 0.1412 or 14.12%.

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Month Change in Water Level (in.) March 8 April –3 May –9 June 5 The water level for a lake was recorded for four months. The data is shown in the table. Which month shows the greatest change in water level? A) March B) April C) May D) June

Answers

Answer: May

Step-by-step explanation: 9 is greater than 8 don't worry about the signs

Define: stratified random sample a) population is divided into similar groups and a SRS is chosen from each group. b) gives each member of the population a known chance to be selected. c) people who choose themselves for a sample by responding to a general appeal. d) the explanatory variable(s) in an experiment. e) directly holding extraneous factors constant. f) every possible sample of a given size has the same chance to be selected. g) using extraneous factors to create similar groups. h) successively smaller groups are selected within the population in stages. i) choosing the individuals easiest to reach.

Answers

Answer:

d) population is divided into similar groups and a SRS is chosen from each group.

Step-by-step explanation:

Stratified random sampling

can be regarded as "proportional random sampling" and is method of sampling which entails division of a population to more simpler sub- groups, this sub- groups are regarded as " strata". This strata are been formed on the basis of shared attributes of the members. This attribute could be educational attainment as well as income. It should be noted that stratified random sample is population is divided into similar groups and a SRS is chosen from each group.

Given a starting guess of [90, yo] = [1, 2], how many iterations does Newton's method for optimization take to find a minimum of the function f(, y) = 12a2 – 7x + 7 +10y? – xy to a tolerance of 10-8? If needed, you may assume quadratic convergence. iterations = integer

Answers

The number of iterations required is 6.

Given a starting guess of [90, yo] = [1, 2], Newton's method for optimization takes 6 iterations to find a minimum of the function f(x, y) = 12a^2 – 7x + 7 +10y – xy to a tolerance of 10^-8.Step-by-step explanation:

Newton's method is an iterative process to approximate the roots of an equation or optimization of a function.

To solve this problem, we need to apply Newton's method to the function f(x, y) = 12a^2 – 7x + 7 +10y – xy as follows:

Given a starting guess of [90, yo] = [1, 2], we can find the solution using the following formula:xn+1 = xn - f'(xn)/f''(xn)where xn is the current guess, f'(xn) is the derivative of f at xn, and f''(xn) is the second derivative of f at xn.

Here, f(x, y) = 12a^2 – 7x + 7 +10y – xy, so we have (x, y) = [-7 - y, 10 - x]f''(x, y) = [0, -1; -1, 0]

We need to apply this formula until the difference between xn and xn+1 is less than or equal to the tolerance of 10^-8.

This means that we need to keep iterating until |xn+1 - xn| <= 10^-8.

Given the assumption of quadratic convergence, we can also calculate the number of iterations required as follows:|xn+1 - xn| ≈ |xn - xn-1|^2/|xn+1 - 2xn + xn-1|

Using this formula, we can calculate the number of iterations required to reach the tolerance of 10^-8.

Here are the results of the first six iterations:x1 = [1, 2]x2 = [4.125, 2.9]x3 = [4.223382352941176, 2.979411764705882]x4 = [4.223639551849474, 2.979707510729614]x5 = [4.223639551862697, 2.979707510767132]x6 = [4.223639551862697, 2.979707510767132]

We can see that the difference between x5 and x6 is less than 10^-8, so we have found a solution to the desired tolerance.

Therefore, the number of iterations required is 6.

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I need this answer b/6=3

Answers

The answer is b=18. To solve, multiply 6 by 3 to get 18. This is called doing the inverse operation. Since the equation is a division equation, we would have to multiply in order to find the missing variable.

Use the benchmark 1/2 to compare 5/8 and 2/7

Answers

Answer:

what?

Step-by-step explanation:

Natalia and Sun are 14.5 m apart and looking up at the top of a radio tower. They are on the same side of the tower. If Natalia is looking up at an angle of 289, and Sun is looking up at the tower at an angle of elevation of 31°, how tall is the tower to the nearest tenth of a metre? Assume their eyes are 1.6 m above the ground.

Answers

The height of the radio tower to the nearest tenth of a metre is 6.9 m.

Let the height of the radio tower be h metresFrom Sun's point of view, the top of the radio tower is right-angled to the horizontal line through his eye. This implies that the length of the radio tower is opposite the angle of elevation.

Thus, the distance of Sun from the radio tower is equal to the length of the adjacent side of the right-angled triangle formed.

Thus, from the tangent ratio:tan 31° = h / 14.5 + 1.6 (since Sun's eye level is 1.6m above the ground)h = (14.5 + 1.6) tan 31° = 6.9 m (to one decimal place)From Natalia's point of view,

the radio tower makes an acute angle with the line of sight from her eye to the top of the radio tower. This implies that the length of the radio tower is adjacent to the angle of elevation.

Thus, the distance of Natalia from the radio tower is equal to the length of the hypotenuse of the right-angled triangle formed.

Thus, from the sine ratio:sin 89° = h / 14.5 - 1.6 (since Natalia's eye level is 1.6m above the ground)

h = (14.5 - 1.6) sin 89° = 12.9 m (to one decimal place)

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Answers

Answer:

Only the mean increased.

Step-by-step explanation:

The mean is the total divided by the number of scores, and since adding 21 will increase the total score significantly, the mean increases.

The median is still 7.

The expression represents a polynomial with terms. The constant term is , the leading term is , and the leading coefficient is .

Answers

There is no polynomial attached ; considering the hypothetival

Answer:

x³ = leading term.

2 = leading Coefficient

1 = constant term.

Step-by-step explanation:

Considering an hypothetical situation ;

For any polynomial such as 2x³ + 3x + 1

The polynomial is represented as : ax³ + bx + c

Where a = leading Coefficient ;

x³ = leading term

c = constant term

Therefore ;

The leading term in this hypothetical question is :

x³ = leading term.

2 = leading Coefficient

1 = constant term.

The lifetimes of a certain brand of photographic light are normally distributed with a mean of 210 hours and a standard deviation of 50 hours. a a) What is the probability that a particular light will last more than 250 hours?

Answers

The lifetimes of a certain brand of photographic light are normally distributed with a mean of 210 hours and a standard deviation of 50 hours. We need to find the probability that a particular light will last more than 250 hours.

Given mean = μ = 210 hours. Standard deviation = σ = 50 hours. Let X be the lifetime of a photographic light. X ~ N (μ, σ) = N (210, 50). The probability that a particular light will last more than 250 hours can be calculated as follows: P(X > 250) = 1 - P(X < 250)Let Z be the standard normal variable.

Then, (250 - μ) / σ = (250 - 210) / 50 = 0.8P(X < 250) = P(Z < 0.8). Using the z-table, the probability that Z is less than 0.8 is 0.7881. Therefore, P(X > 250) = 1 - P(X < 250) = 1 - 0.7881 = 0.2119. Hence, the probability that a particular light will last more than 250 hours is 0.2119.

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If the width of the fridge is 4 inches and cost of one square inch is five dollars find the total cost of the blanket

Answers

Answer:

$20

Step-by-step explanation:

Waldo is looking up at his kite at a 22 degrees angle of elevation. If the horizontal distance to his kite is 225 feet, how long is the string from his hand to his kite ?

Answers

Answer:

The height of the kite from the ground is 13.617 feet  

Step-by-step explanation:

Given as :

The measure of the string = 30 feet

The angle of elevation from the boy to his kite = 27°

Let the height of the kite from ground = H feet

So, From Triangle

Sin angle =

Or, Sin 27° =  

or, H = 30 ×  Sin 27°

I.e H = 30 × 0.4539

∴ H = 13.617 feet

Hence the height of the kite from the ground is 13.617 feet   Answer

HELP PLEASE!!
On October 1, Gary’s bank balance was $130. During October, he made two
withdrawals and one deposit. At the end of the month, his bank balance was
$95. List two withdrawals and one deposit that would give this final balance.

Answers

Answer: $50 withdrawl $50 withdrawl and $65 deposite

Step-by-step : $50 withdrawl $50 withdrawl and $65 deposite

Solve the differential equation, 6 x dx + 4 x dy = 0, using separation of variables

Answers

The general solution to the differential equation is: y = -(3/2)x + C, where C is the constant of integration.

To solve the differential equation 6x dx + 4x dy = 0 using separation of variables, we need to rearrange the equation so that all the x terms are on one side and all the y terms are on the other side.

Let's start by dividing both sides of the equation by 4x:

(6x dx + 4x dy) / 4x = 0

(6x / 4x) dx + (4x / 4x) dy = 0

(3/2) dx + dy = 0

Now we can separate the variables by moving the dy term to the other side:

dy = -(3/2) dx

Integrating both sides with respect to their respective variables, we have:

∫ dy = ∫ -(3/2) dx

The integral of dy with respect to y is simply y, and the integral of -(3/2) dx with respect to x is -(3/2)x:

y = -(3/2)x + C

where C is the constant of integration. Thus, the general solution to the differential equation is:

y = -(3/2)x + C

This is the final solution using separation of variables.

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Mhanifa can you please help? This is due asap!

Answers

13. k=3/4       14. a=23

15. p= 5 1/2    16. x=13

17. m=56         18. n=1 1/2

Answer:

13)

9/8 = (k + 6)/6 8(k + 6) = 6*98k + 48 = 548k = 6k = 6/8k = 3/4

14)

2/10 = 4/(a - 3)a - 3 = 4*5a - 3 = 20a = 23

15)

10/(p + 2) = 4/34(p + 2) = 10*34p + 8 = 304p = 22p = 22/4p = 11/2

16)

4/6 = 8/(x - 1)4(x - 1) = 8*6x - 1 = 12x = 13

17)

m/8 = (m + 7)/ 99m = 8(m + 7)9m = 8m + 56m = 56

18)

n/(n + 1) = 3/55n = 3(n + 1)5n = 3n + 32n = 3n = 3/2

what is the diameter ?​

Answers

Answer:

37.999749573966

Step-by-step explanation:

Brainliest?

The table below shows the score
Analisa and Luke earned on four science
projects.
Science Project Scores
Project Analisa Luke
95 90
2
81 84
3
76 95
4
88 91
5
2
?
Analisa and Luke worked on a fifth
science project together. They each
carned the same score on the project.
When the fifth score is included in the
table, Analisa's mean score does not
change
Which of the following statements
describes how Luke's mean score
changes when the fifth score is included
in the table?

Answers

Answer:

It increases by 2.5

Step-by-step explanation:

yeah

Mr. Adams drove his delivery truck 151.2 miles during 24 days. He drove the same number of miles each day.

How many miles did Mr. Adams drive each day?

Answers

Divide total miles by number of days:

151.2 / 24 = 6.3 miles per day

convert 50 percentage into fraction​

Answers

Answer:

50/100, simplified to 1/2

Step-by-step explanation:

50% means half of 1.

1/2=.5 which is half of 1.

1=100%

.5=50%

1/2=50%

Answer:

[tex] \displaystyle \frac{1}{2} [/tex]

Step-by-step explanation:

we are given a parcentage

we want to convert it into fraction

remember that,

[tex] \displaystyle \% = \frac{1}{100} [/tex]

therefore

substitute:

[tex] \displaystyle 50 \times \frac{1}{100} [/tex]

reduce fraction:

[tex] \displaystyle \cancel{50} \times \frac{1}{ \cancel{100} \: ^{2} }[/tex]

[tex] \displaystyle 1 \times \frac{1}{2} [/tex]

simplify multiplication:

[tex] \displaystyle \frac{1}{2} [/tex]

hence,

[tex] \displaystyle 50\% = \frac{1}{2} [/tex]

30 in.
10 in.
10 in.
30 in.
20 in.
Find the area of the arrow above.
square inches

Answers

Answer: 45

Step-by-step explanation:

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Answers

Answer:

A would be the answer I would choose

This diagram shows a cylinder that has a radius of 3 inches and a height
of 5 inches.
3 in.
5 in.
What is the volume, in cubic inches, of the cylinder?
A. 151
B. 307
C. 451
D. 601

Answers

I’m not exactly sure but I think it’s 151

The volume, in cubic inches, of the cylinder will be   [tex]\frac{990}{7}[/tex]  or [tex]45\pi[/tex] cubic inches.

What is Cylinder?

Cylinder is a [tex]3D[/tex] solid shape which holds two parallel bases joined by a curved surface, at a fixed distance. These bases are circular in shape and the center of the two bases are joined by a line segment.

What is volume?

Volume is define as capacity of cylinder.

Volume of cylinder [tex]=\pi r^{2} h[/tex]

We have,

Radius [tex]=3[/tex] inches

Height [tex]=5[/tex] inches,

Then,

Volume of cylinder [tex]=\pi r^{2} h[/tex]

                              [tex]=\frac{22}{7} *(3)^{2} *5[/tex]

                               [tex]=\frac{990}{7}[/tex]  or [tex]45\pi[/tex] cubic inches

Hence, we can say that The volume, in cubic inches, of the cylinder will be     [tex]\frac{990}{7}[/tex]  or [tex]45\pi[/tex] cubic inches

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4
The equation below has no solution.
2
2 - 72 + 3 + 4x = ax + b
True
False

Answers

it is True ..............................................

Answer:

True

Step-by-step explanation:

2-72+3+4x=ax+b

73 + 4x = ax + b

Since there are 3 variables in this equation you need 3 equations. Since there is only 1 you cannot continue solving this equation after you simplified.

Hope this helps!

A random sample of 700 Democrats included 644 that consider protecting the environment to be a top priority. A random sample of 850 Republicans included 323 that consider protecting the environment to be a top priority. Construct a 90% confidence interval estimate of the overall difference in the percentages of Democrats and Republicans that prioritize protecting the environment. (Give your answers as percentages, rounded to the nearest tenth of a percent.)

Answers

The 90% confidence interval estimate of the overall difference in the percentages of Democrats and Republicans that prioritize protecting the environment is -21.3% to -16.1%, which represents the range of values within which the true difference is likely to fall.

To construct the confidence interval, we first calculate the sample proportions for Democrats and Republicans: p₁ = 644/700 ≈ 0.92 for Democrats, and p₂ = 323/850 ≈ 0.38 for Republicans.

Next, we calculate the standard error of the difference using the formula: SE = √((p₁(1-p₁)/n₁) + (p₂(1-p₂)/n₂)), where n₁ and n₂ are the sample sizes.

Using the given sample sizes, the standard error is approximately 0.019.

To determine the margin of error, we multiply the standard error by the z-score corresponding to a 90% confidence level, which is approximately 1.645.

Finally, we calculate the lower and upper bounds of the confidence interval by subtracting and adding the margin of error from the difference in sample proportions: 0.92 - 0.38 ± (1.645 * 0.019).

The resulting confidence interval is approximately -21.3% to -16.1%, which represents the range within which we can estimate the overall difference in the percentages of Democrats and Republicans prioritizing environmental protection.

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Another translation that I need help on T__T

Answers

The translation for this problem is classified as follows:

2 units left -> horizontal translation.4 units down -> vertical translation.

What are the translation rules?

The four translation rules are defined as follows:

Left a units: x -> x - a. -> horizontal translation.Right a units: x -> x + a. -> horizontal translation.Up a units: y -> y + a. -> vertical translation.Down a units: y -> y - a. -> vertical translation.

For this problem, we have a translation 2 units left, which is an horizontal translation, and then a translation 4 units down, which is a vertical translation.

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**Jane found money in her pocket. She went to a convenience store and spent 1/4 of her money on chocolate milk, 3/5 of her money on a magazine, and the rest of her money on candy. What fraction of her money did she spend on candy? ​

Answers

Answer:

3/20

Step-by-step explanation:

1/1-1/4-3/5= (money spent)

1×4×5/(1×4×5)-1×1×5/(1×4×5)-3×1×4/(1×4×5)

20/20-5/20-12/20

(20-5-12)/20=3/20

Answer:

$y - $0.85

Step-by-step explanation:

y represents how much money he had.

[tex]\frac{3}{5}+\frac{1}{4} =\frac{17}{20}[/tex]

$y - $0.85

Kitchen chairs are purchased wholesale for $36 each by a discount furniture store. Then, the store marks up the chairs by 60 percent. The store has a special sale where all items are marked down by 20 percent. How much would two chairs cost during the sale? $46.08 $57.60 $92.16 $115.20Kitchen chairs are purchased wholesale for $36 each by a discount furniture store. Then, the store marks up the chairs by 60 percent. The store has a special sale where all items are marked down by 20 percent. How much would two chairs cost during the sale? $46.08 $57.60 $92.16 $115.20

Answers

Answer:

46.08

Step-by-step explanation:

you have to make your percentage a decimal, which 60% will be .60 and 20% will be .20. you then multiply your initial number which is 36 by .60 and add that on because youre adding 60%. After that you will multiply that given number by .20 and you subtract what that product is from your last product you received (36x.60) which if im not mistaken will give you $46.08.

Answer:

C

Step-by-step explanation:

I took the test

Help PLEASEE!!!!!!!!!!

Answers

I think it’s the third one. Hope that helps!

Answer:

the answers are B or C x>4/19

how can you write a quadratic function in
standard form, given its vertex form?

Answers

Answer + Explanation:

y = a(x - h)^2 + k

y = 2(x + 4)^2 - 2

y = 2(x^2 + 8x + 16) - 2

y = 2x^2 + 16x + 32 - 2

y = 2x^2 + 16x + 30

Hopefully this helps!

A computer programmer charges $30 for an initial consultation and $35 per hour for programming. Write a formula for her total charge for h hours of work. *
1 point
A) (30 + 35)h
B) 30 + 35h
C) 35 + 30h
D).65h

Answers

B- 30+35h is the answer for sure
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which of the achievements above do you think united abbasid society the most? explain. Which of the following shows the correct relationship among the epidemiology terms listed?- mortality > incidence > prevalence- incidence > prevalence > mortality- prevalence > incidence > mortality- mortality > morbidity > prevalence Which act requires lobbyists and interest groups to register with the federal government?Bipartisan Campaign Reform ActFederal Election Campaign ActThe Lobbying Disclosure ActHonest Leadership and Open Government Act a candle starts at 9 inches long. after burning for 4 hours , it was 7 inches tall.a. how would you categorize this situation as a function? circle one according to bowlby and ainsworth, what type of attachment style does david display? explain. Find a solution to dx = = xy + 8x + 2y + 16. If necessary, use k to denote an arbitrary con Which antinuclear antibody (ANA) pattern is seen in the image on the right, which represents the result of an ANA test viewed using fluorescent microscopy? Note: (a) points to the nuclei of interphase cells, the primary consideration for discerning the ANA pattern and (b) indicates a metaphase mitotic cell. Which of the following diseases is characterized by abnormally increased constriction of the bronchi and bronchioles?A. Bronchitis B. EmphysemaC. Cystic fibrosis D. Asthma Is Frank O'Gary's artwork contemporary why or why not ? a. What are the advantages and the disadvantages of purchasing an outlet from small franchise systems?b. Develop a list of questions that a prospective franchisee should ask the franchisor and existing franchisees before deciding to invest in the franchises described here. If investors have homogeneous expectations, the market is efficient, and there are no taxes, no transactions costs, and no bankruptcy costs, the Modigliani and Miller Proposition I states that:a. bankruptcy risk rises with more leverage.b. managers cannot change the value of the company by using more or less debt.c. managers cannot increase the value of the company by employing tax saving strategies. An electron is located on a pinpoint having a diameter of 2.5 m. What is the minimum uncertainty in the speed of the electron? Why does Beverly return to Mulberry Row after his planned departure? What were your opinions of this part of the story? How do they influence your understanding of the characters and of the world in which they live? 1. What are cultural landscapes?2. Are you a Digital Native?3. What does McLuhan mean with the term global village?4. What is the term digital divide referring to? An annuity pays $1200 per year for 15 years. The money is invested at 5.2%, compounded annually. The first payment is made one year after the purchase of the annuity. Determine the interest earned by the annuity over 15 years. 14. A licensee is a partner in a title company. whatshould the licensee do if the buyer she represents us about thetitle insurancea. advise the client to seek legal adviceb. provide the client wit The reorganization of Sears Holdings Corporation under its chairman, Eddie Lampert, resulted in better collaboration and cooperation among various department heads. O True O False The transactions of Spade Company appear below.a. Kacy Spade, owner, invested $12,250 cash in the company.b. The company purchased office supplies for $355 cash.c. The company purchased $6,774 of office equipment on credit.d. The company received $1,446 cash as fees for services provided to a customer.e. The company paid $6,774 cash to settle the payable for the office equipment purchased in transaction c.f. The company billed a customer $2,597 as fees for services provided.g. The company paid $520 cash for the monthly rent.h. The company collected $1,091 cash as partial payment for the account receivable created in transaction f.i. Kacy Spade, withdrew $1,000 cash from the company for personal use.Prepare the Trial Balance. determine an expression in terms of m and l for the moment of inertia of the masses about axis a. One of the major topics this week was organizational structure. Explain what you think the perfect organizational structure is, and why.