And finally, we can use the parameters r and s to write the plane in vector form:
< x, y, z > = < r, s, (3180 + 152r + 363s) / 728 >
To parameterize the plane containing the three points (3, -4, 3), (-12, -8, -8), and (15, 40, 35), we first need to find two vectors that lie in the plane. We can do this by taking the difference between each pair of points:
v = < -12 - 3, -8 - (-4), -8 - 3 > = < -15, -4, -11 >
w = < 15 - 3, 40 - (-4), 35 - 3 > = < 12, 44, 32 >
Now, we can use these vectors to write the equation of the plane in parametric form. Let n be the normal vector to the plane, which is the cross product of v and w:
n = v x w = < -15, -4, -11 > x < 12, 44, 32 > = < -152, -363, 728 >
Now, we can write the equation of the plane as:
-152x - 363y + 728z = d
To find the value of d, we can substitute any of the three points into this equation. Let's use the first point (3, -4, 3):
-152(3) - 363(-4) + 728(3) = d
-456 + 1452 + 2184 = d
d = 3180
So the equation of the plane is:
-152x - 363y + 728z = 3180
To write this in parametric form, we can solve for one of the variables in terms of the other two:
z = (3180 + 152x + 363y) / 728
Now we can write the vector equation of the plane as:
= < r, s, (3180 + 152r + 363s) / 728 >
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Which object has a greater surface area: a cube with edges
of 1 centimeter or a cylinder with a diameter and helght of 1
centimeter?
A) cube
B) Cylinder
C) neither, they have the same surface
D) impossible to determine without more information
Answer:
cylinder
Step-by-step explanation:
SA(cube) = 6 cm³
SA(cyl) = 36.11 cm³
Adam is saving money to buy a new computer that costs $550. His mom has given him $100 to begin. Each week, he deposits money into his savings account. The table shows the balance after t weeks. Time (t) in weeks 0 1 2 3 4 Balance (b) $100 $125 $150 $175 $200 Write an equation to represent this situation.
Answer:
25t + 100 = 550
Step-by-step explanation:
Notice that for every week, the balance increases by $25. That means t will be multiplied by 25 like this: 25t
There is already $100 on top of that, so add 100 to it like this: 25t + 100
Since Adam is saving for a $550 computer, this sum has to equal 550
25t + 100 = 550
If you want to find out how many weeks it will take to get that computer, subtract 100 from both sides
25t + 100 = 550
- 100 - 100
25t = 450
Divide both sides by 25
25t/25 = 450/25
t = 18
It will take Adam 18 weeks to save up and buy that computer.
Answer:
oh its simple .
Step-by-step explanation:
just listen to whatever that guy above me told u .
PLEASE HELP WHAT IS THE DOMAIN AND RANGE OF THIS GRAPH
Pay attention in school bud
I need help with this asap
Can u guys help pls? This is due in 10 mins
Answer:
Question 7: 16n^8 Question 8: 6r^4 Question 4: (-1,-7) Question 6: 6y^7
Step-by-step explanation:
Do i need it?
f(x)={x+4 x<5
8 5
2x-1 7
for “f(x)” exculpate the following
a. f(0)
b. f(6)
SHOW ALL WORK PLEASE
Answer:
a. 4 b.8
Step-by-step explanation:
a.
0 ∈ x<5
f(x)=x+4
f(0)=0+4=4
b.
6 ∈ 5≤x<7
f(x)=8
f(6)=8
convert decimal number 0.5625 (or 9/16) to a single-precision floating point number. the answer should be given in hex at the end. (failed to provide steps will result in losing most of the points of the question.)
The single-precision floating point representation of 0.5625 in hexadecimal is: 0x3E100000.
How to solve for the single-precision floating pointIdentify the sign bit. In this case, the number is positive, so the sign bit is 0.
Convert the decimal number to binary. The decimal number 0.5625 (or 9/16) can be converted to binary as follows: 0.1001.
Convert the 32-bit binary number to hexadecimal. To do this, group the binary number into blocks of 4, from right to left, and convert each block into its hexadecimal equivalent:
0000 -> 0
0000 -> 0
0000 -> 0
0000 -> 0
0000 -> 0
0001 -> 1
0000 -> 0
0111 -> 7
1110 -> E
0 -> 0
So, the single-precision floating point representation of 0.5625 in hexadecimal is: 0x3E100000.
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You are working with a satellite image of Anchorage, AK (∼150
∘
W) with the time stamp 0300Z, Dec. 3 2011. This means that it was 3AM on Dec. 3 at the Prime Meridian when the image was taken. What was the local time and day in Anchorage when the image was taken?
the local time in Anchorage when the image was taken was 5:00 PM, and the local day was Dec. 2, 2011.
To determine the local time and day in Anchorage when the satellite image was taken, we need to consider the time difference between the Prime Meridian (0 degrees longitude) and Anchorage, Alaska (approximately 150 degrees west longitude).
Each time zone is approximately 15 degrees wide, representing a one-hour difference in local time. Anchorage is in the Alaska Standard Time (AKST) zone, which is typically UTC-9 (nine hours behind UTC) during standard time.
Given that Anchorage is about 150 degrees west of the Prime Meridian, we can calculate the time difference as follows:
150 degrees / 15 degrees per hour = 10 hours
Therefore, when the image was taken at 0300Z (3:00 AM), Dec. 3, 2011, at the Prime Meridian, the local time and day in Anchorage were:
3:00 AM - 10 hours = 5:00 PM, Dec. 2, 2011
So, the local time in Anchorage when the image was taken was 5:00 PM, and the local day was Dec. 2, 2011.
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Researchers investigated whether there is a difference between two headache medications, R and S. Researchers measured the mean times required to obtain relief from a headache for patients taking one of the medications. From a random sample of 75 people with chronic headaches, 38 were randomly assigned to medication R and the remaining 37 were assigned to medication S. The time, in minutes, until each person experienced relief from a headache was recorded. The sample mean times were calculated for each medication. Have the conditions been met for inference with a confidence interval for the difference in population means? A Yes, all conditions have been met. B No, because the data were not collected using a random sample. © No, because cause and effect cannot be inferred since there is a random sample No, because the sample sizes are not large enough to assume the distribution of the difference in sample means is approximately normal. (E) No, because the sample sizes are not the same.
The correct answer is option D. No, because the sample sizes are not large enough to assume the distribution of the difference in sample means is approximately normal.Researchers investigated whether there is a difference between two headache medications, R and S.
Researchers measured the mean times required to obtain relief from a headache for patients taking one of the medications. From a random sample of 75 people with chronic headaches, 38 were randomly assigned to medication R and the remaining 37 were assigned to medication S. The time, in minutes, until each person experienced relief from a headache was recorded. The sample mean times were calculated for each medication.To construct a confidence interval, we require that some conditions are satisfied. The assumptions that should be met for inference with a confidence interval for the difference in population means are as follows:The data is independent;The data in each group should be roughly normally distributed;Both groups have the same variance, and each group should have a large enough sample size so that the central limit theorem (CLT) holds. The CLT holds for the difference in the sample means since both samples are taken from a population that is normally distributed. We can also assume that the sample size is large enough to use the t-distribution since each sample has more than 30 observations. As a result, all of the conditions have been met. As a result, we may employ a t-distribution to make inferences about the population difference between the two headache medications.
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can someone please help! :)
which function has a greater rate of change?
Answer:
Function A has a rate of change of 5 and Function B has a rate of change of 4.5. Thus, Function A has a higher rate of change
Step-by-step explanation:
If f(3) = 3(x+5+2, what is f(a+ 2)?
Solution:
f(3) = 3(x + 5 + 2)
f(3) = 3(3 + 5 + 2)
f(3) = 3(10)
f(3) = 30
Substitute 30 for a:
f(30 + 2)
f(32)
Best of Luck!
WILL MARK IF RIGHT + 10 POINTS(hurry)
CONVINCE ME THAT the following 2 expressions are equal! Explain your work and justify your reasoning. Feel free to show your work on a separate sheet of paper, take a picture of it, and attach the image to your "New Thread".
Answer:
See below
Step-by-step explanation:
3 - 2(-2.6x) - 2(2.1) = ( after expanding L side)
3 + 5.2x -4.2 =
5.2x - 1.2 Yep. They are equal .
Suppose each person has 12 hours for the two tasks in a week, and suppose both Sheldon and Leonard each spend 6 hours on cooking and 6 hours on laundry. Consider an offer from Leonard to Sheldon: do 3 baskets of laundry for me each week, and I’ll cook you 2 meals. Can you find a production plan such that the offer benefits both Leonard and Sheldon? Hint: For a production plan, you need to specify how each person divides his 12 hours between the two tasks. The offer benefits Sheldon (or Leonard) when it results in no fewer meals and no fewer baskets for him. (10 points)
1.8. Consider the same setup in 1.7. Consider another offer from Leonard to Sheldon: do 1 basket of laundry for me each week, and I’ll cook you 3 meals. Can you find a production plan such that the offer benefits both Leonard and Sheldon? Explain your answer.
Both offers are mutually beneficial and help to save time for both parties.
Here, the production plans for Leonard and Sheldon for both offers can be as follows:
Offer 1: Leonard does 7 hours of cooking and 5 hours of laundry, while Sheldon does 5 hours of cooking and 7 hours of laundry. This way, Leonard gets to save 1 hour on laundry and Sheldon gets 1 extra meal.
Offer 2: Leonard does 9 hours of cooking and 3 hours of laundry, while Sheldon does 3 hours of cooking and 9 hours of laundry. This way, Leonard gets to save 3 hours on cooking and Sheldon gets 2 extra meals.
Leonard and Sheldon spend equal amounts of time on cooking and laundry, i.e., 6 hours on each. Leonard offers Sheldon to do his laundry in return for cooking him more meals.
In the first offer, Sheldon does 7 hours of laundry and 5 hours of cooking, while Leonard does 5 hours of laundry and 7 hours of cooking.
Thus, Sheldon gets 1 extra meal and Leonard saves 1 hour on laundry.
In the second offer, Sheldon does 9 hours of laundry and 3 hours of cooking, while Leonard does 3 hours of laundry and 9 hours of cooking.
Thus, Sheldon gets 2 extra meals and Leonard saves 3 hours on cooking. Therefore, both offers benefit each person in their own way.
Thus, we can conclude that in the first offer, Sheldon gets to eat one extra meal while Leonard gets to save an hour on laundry. In the second offer, Sheldon gets to eat two extra meals while Leonard saves three hours on cooking. Therefore, both offers are mutually beneficial and help to save time for both parties.
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Suppose a certain amount of money is deposited into an account paying 4%, compounded annually. For each non-negative integer n, let S(n)= the total amount in the account after n years, and let S(0) be the initial amount deposited. (a) Find a recurrence relation for S(0),S(1),S(2),⋯ assuming no additional deposits or withdrawals for n years; provide your answer as a recurrence formula with base case. (b) If S0=$5000, find the amount of money on deposit at the end of 4 years.
a) The recurrence relation for the amount in the account paying 4%, compounded annually at the end of n years with is \(S(n)=1.04^n*S(0)\).
b) The amount of money at end of 4 years is $5849.29
a)
Given,
Amount of money deposited into account with interest 4% compounded annually.
If s(n) is the total amount in account after n years and S(0) is the initial amount deposited then the recurrence relation can be written as,
\(S(n) = S(n-1) +0.04*S(n-1)\\\\\)
where 4% = 0.04
\(S(n) = 1.04*S(n-1)-------eq(1)\)
replacing n by n-1 in eq (1)
\(S(n-1) = 1.04*S(n-2))\\\\S(n)=1.04*1.04*S(n-2)\\\\S(n)=1.04^2*S(n-2)\)
replacing n by n-2 in eq (1),
\(S(n-2) = 1.04*S(n-3)\\\\S(n)=1.04^3*S(n-3)\)
then general equation for n years can be written as
\(S(n)=1.04^n*S(n-n)\\\\S(n)=1.04^n*S(0)\)
b)
using above formula,
Let S(0) represent the $5,000 initial deposit then S(4) represent the amount in the bank after 4 years.
\(S(4) = 1.04^4*S(0)\\\\S(4)=1.1698585*5000=5849.292\)
Thus, the amount of money at the end of 4 years is $5849.29
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If you wanted to replicate a study as closely as possible, which part of a research article would provide you with the most details about how the data was collected
When you want to replicate a study as closely as possible, the Methodology section of a research article would provide you with the most details about how the data was collected.
the instruments used to collect the data, the sampling method, and the procedures employed during data collection. In most research articles, the methodology section can be found after the introduction section.
It includes information on the data collection techniques used, including the type of research design, the sampling technique, data collection instruments, and the procedures used to collect the data.
.In summary, if you want to replicate a study as closely as possible, you should carefully examine the methodology section of the research article. This section contains a detailed account of how the data was collected, analyzed, and interpreted in the study.
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round to the nearest whole number than add 4.208 + 2.482
4.208 + 2.482= 6.69 so rounding that would be 7
4.208 + 2.482 = 6.69
When we round it to the nearest, it becomes 7.
Hope it helps you..
According to the Greek mathematician Zeno, if each bounce of a ball is half the height of the bounce before it, the ball will never stop bouncing. Write the fractions in hundredths that should be written up points B and C.
The fractions written up points B and C are 50% and 25%, respectively, in hundredths.
We have,
Let's assume that the initial height of the ball is 100 units
(could be meters, feet, or any other unit of measurement).
At point B, the ball reaches a height of 50 units since each bounce is half the height of the bounce before it.
The fraction of the height of the ball at point B compared to its initial height.
= 50/100 = 0.5 or 50%
At point C, the ball reaches a height of 25 units.
Again, using the same logic, the fraction of the height of the ball at point C compared to its initial height.
= 25/100
= 0.25 or 25%
Thus,
The fractions written up points B and C are 50% and 25%, respectively, in hundredths.
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when finding a minimum in a linear programming problem, it is possible to find more than one minimum value. yes or no
The statement 'when finding a minimum in a linear programming problem, it is possible to find more than one minimum value' is True.
In this question, we have been given a statement - 'when finding a minimum in a linear programming problem, it is possible to find more than one minimum value.'
We need to state whether it is true or false.
We know that, the minimum value of the objective function Z = ax + by in a linear programming problem can also occur at more than one corner points of the feasible region.
Therefore, when finding a minimum in a linear programming problem, it is possible to find more than one minimum value.
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two ferries start moving toward each other from opposite riverbanks, a and b. when they pass each other for the first time, the distance to riverbank b is 100 meters. each ferry starts its return trip as soon as it reaches its destination. when the ferries meet for the second time, the distance to riverbank A is 50 meters. what is the distance between riverbanks a and b? Help I will give 40 points
As there is no information about the speed of the ferries, we can infer that they move at the same speed.
Therefore, we can say that they cross each other at the same point both on their way and on their way back.
Since the "meeting point" is on a streight line in between the two shores, 100 meters from shore B and 50 meters from shore A, the distance between shore A and B will be 100 + 50 = 150 meters.
Hence, the distance between shores A and B is 150 meters.
The variable f varies inversely as the square root of g. When f = 4, g = 4. Jordan’s work finding the value of f when g = 100 is shown: f = k 4(4) = k 16 = k f = 16 f = 16 10f = 16 f = 1.6 What is the first error, if any, in Jordan’s work?
Variation can be direct, inverse or jointly
Jordan's first error is that he incorrectly calculated the value of proportionality constant
From the question, we understand that f varies directly as the square root of g.
This variation is represented as:
\(\mathbf{ f\ \alpha\ \frac{1}{\sqrt{g}}}\)
Express as a equation
\(\mathbf{ f\ \ =\ k\frac{1}{\sqrt{g}}}\)
When f = 4, k = 4.
So, we have:
\(\mathbf{ 4\ \ =\ k\frac{1}{\sqrt{4}}}\)
\(\mathbf{ 4\ \ =\ \frac{k}{2}}\)
Multiply both sides by 2
\(\mathbf{ k = 8}\)
When g = 100, we have:
\(\mathbf{ f\ \ =\ k\frac{1}{\sqrt{g}}}\)
\(\mathbf{ f\ \ =\ 8 \times \frac{1}{\sqrt{100}}}\)
\(\mathbf{ f\ \ =\ 8 \times \frac{1}{10}}\)
\(\mathbf{ f\ \ = 0.8}\)
This means that, Jordan incorrectly calculated the value of proportionality constant
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Hasan buys two kinds of cloth materials for school uniforms, shirt material that costs him ₹ 50 per metre and trousers material that costs him ₹ 90 per metre. For every 3 metres of the shirt material, he buys 2 metres of the trouser material. He sells the materials at 12% and 10% profit respectively. His total sale is ₹ 36,660. How much trouser material did he buy?
Answer:
200.33 mStep-by-step explanation:
Let the amount of shirt material is s and trouser material is t.
We have equations based on given details:
s/t = 3/2s*50*(1 + 0.12) + t*90*(1 + 0.1) = 36660Simplify and solve for t by substitution:
s = 3/2t56s + 99t = 3666056*3/2t + 99t = 3666084t + 99t = 36660183t = 36660t = 36660/183t = 200.33 mReselect all cases. Define TX + Y. Then recode into a categorical variable G such that G-1 İFT <= 10 and G=0 ifT> 10. For variable G what is the frequency of 1? a. 0.973 b. 1027 c. 2000 d. 973
The frequency of 1 is option (d) 973
Reselecting cases means selecting a subset of data that meets specific criteria. In this case, you will need to identify which cases to keep based on certain conditions. After reselecting cases, the next step is to define the variable TX + Y. This means that you will perform an operation on two existing variables, T and Y, and create a new variable that is the sum of T and Y. The result will be a numerical variable.
To summarize, you will need to follow these steps:
Reselect cases based on specific criteria.
Define the variable TX + Y as the sum of T and Y.
Recode the numerical variable into a categorical variable with two categories: G-1 İFT <= 10 and G=0 if T>10.
Calculate the frequency of category 1 in the new variable G.
Finally, to answer the question, you will need to calculate the frequency of category 1 in the variable G. This means that there are 973 cases where the value of TX + Y is less than or equal to 10.
The correct answer is option d. 973.
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I WILL GIVE YOU 5 STARS ON YOUR PROFILE COMMNET I WILL ALSO GIVE A THANK YOU ON YOUR ACC AND COMMENT!!!!
Answer:
The answer is C. 2.94
Step-by-step explanation:
All you have to do is take 588 and divide it by 200 which gives you the answer of 2.94.
Let us suppose a population size of 67 million, and innovation parameter of 0.005 and imitation parameter of 0.84 for Color TV. Estimate how many new users would be added during time period 7.
To estimate the number of new users that would be added during time period 7, we can use the Bass diffusion model, which is commonly used to model the adoption of new products or technologies.
The Bass diffusion model is given by the formula:
\(\[N(t) = \frac{{p \cdot q}}{{q + (p/q) \cdot e^{-((p+q) \cdot t)}}}\]\)
where:
- N(t) represents the cumulative number of adopters at time \(t\).
- p is the innovation parameter, representing the coefficient of innovation.
- q is the imitation parameter, representing the coefficient of imitation.
- e is the base of the natural logarithm.
Given a population size of 67 million, an innovation parameter of 0.005, and an imitation parameter of 0.84 for Color TV, we can substitute these values into the Bass diffusion model and calculate the number of new users added during time period 7.
\(\[N(7) - N(6) = \frac{{p \cdot q}}{{q + (p/q) \cdot e^{-((p+q) \cdot 7)}}} - \frac{{p \cdot q}}{{q + (p/q) \cdot e^{-((p+q) \cdot 6)}}}\]\)
Substituting the given values into the equation:
\(\[N(7) - N(6) = \frac{{0.005 \cdot 0.84}}{{0.84 + (0.005/0.84) \cdot e^{-((0.005+0.84) \cdot 7)}}} - \frac{{0.005 \cdot 0.84}}{{0.84 + (0.005/0.84) \cdot e^{-((0.005+0.84) \cdot 6)}}}\]\)
Evaluating the expression will give us the estimated number of new users added during time period 7.
In LaTeX, the solution can be represented as:
\(\[N(7) - N(6) = \frac{{0.005 \cdot 0.84}}{{0.84 + (0.005/0.84) \cdot e^{-((0.005+0.84) \cdot 7)}}} - \frac{{0.005 \cdot 0.84}}{{0.84 + (0.005/0.84) \cdot e^{-((0.005+0.84) \cdot 6)}}}\]\)
After evaluating this expression, you will obtain the estimated number of new users added during time period 7.
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the study of hypnosis and its relationship to hysteria was the starting point for
The study of hypnosis and its relationship to hysteria was the starting point for the development of psychoanalysis by Sigmund Freud.
The study of hypnosis and hysteria in the late 19th century by Sigmund Freud and his contemporaries led to the development of psychoanalysis, a form of psychotherapy that emphasizes the role of unconscious thoughts and feelings in shaping behavior. Through his work with patients suffering from hysteria, Freud became interested in the idea that psychological conflicts could be traced back to early childhood experiences, and that these conflicts could be resolved through the exploration of unconscious thoughts and feelings. This eventually led to the development of psychoanalysis as a theory and practice for the treatment of psychological disorders.
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Serigo used 20 yards of fence to enclse a rectanglur garden he wanted the rectangle to have the greatest possible arra what are the dimensions and area of sergios garden
The dimensions and area of Sergio's garden are 5 yards and 25 square yards respectively
What are the dimensions and area of Sergio's garden?The given parameters are
Perimeter = 20 yards
For the rectangle to have the greatest are, the rectangle must be a square
So, the dimension is
Length = Perimeter/4
This gives
Length = 20/4
Evaluate
Length = 5
The area of Sergio's garden is
Area = 5 * 5
Evaluate
Area= 25
Hence, the dimensions and area of Sergio's garden are 5 yards and 25 square yards respectively
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Work Problem 1 : Evaluate the double integral ∬_D^x2ydA Where D is the region delimited by the lines y=0,y=x^3,x=−1,x=0 Instructions for answering this question: The answer to this question is required as handwritten where you are also required to add a Handwritten Integrity Statement.
Answer:
Step-by-step explanation:
To evaluate the double integral ∬_D^x^2y dA, where D is the region delimited by the lines y=0, y=x^3, x=-1, and x=0, we can set up the integral as follows:
∬_D^x^2y dA = ∫_-1^0 ∫_0^(x^3) x^2y dy dx
We integrate with respect to y first, then with respect to x.
∫_0^(x^3) x^2y dy = (1/2) x^2y^2 |_0^(x^3) = (1/2) x^2(x^3)^2 - (1/2) x^2(0)^2
= (1/2) x^2(x^6) - (1/2) x^2(0)
= (1/2) x^8
Now, integrate the result with respect to x:
∫_-1^0 (1/2) x^8 dx = (1/2) * (1/9) x^9 |_(-1)^0
= (1/2) * (1/9) (0^9 - (-1)^9)
= (1/2) * (1/9) (0 + 1)
= 1/18
Therefore, the value of the double integral ∬_D^x^2y dA over the region D is 1/18.
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The equation P=−300t+2.300, can be used to find the value, P, of a notebook computer at the end of t years. a. What is the value of the notebook computer at the end of five years? At the end of five years, the notebook will be worth $ b. When is the notebook computer worth $1,400 ? At the end of years the notebook will be worth $1,400. c. Is it true that the notebook computer with be worth $1,300 after four years? d. How much did the notebook computer cost? The notebook originally cost $
a. the notebook will be worth $800. b. the notebook will be worth $1,400. c. the notebook will be worth $1,100, not $1,300. d. the notebook originally cost $2,300.
a. To find the value of the notebook computer at the end of five years, we substitute t = 5 into the equation:
P = -300t + 2,300
P = -300(5) + 2,300
P = -1,500 + 2,300
P = $800
Therefore, at the end of five years, the notebook will be worth $800.
b. To find when the notebook computer is worth $1,400, we set the equation equal to 1,400 and solve for t:
P = -300t + 2,300
1,400 = -300t + 2,300
-300t = 1,400 - 2,300
-300t = -900
t = -900 / -300
t = 3
Therefore, at the end of 3 years, the notebook will be worth $1,400.
c. To determine if the notebook computer will be worth $1,300 after four years, we substitute t = 4 into the equation:
P = -300t + 2,300
P = -300(4) + 2,300
P = -1,200 + 2,300
P = $1,100
Therefore, after four years, the notebook will be worth $1,100, not $1,300.
d. The cost of the notebook computer can be determined by looking at the initial value of P. From the equation, we can see that the initial value is $2,300. Therefore, the notebook originally cost $2,300.
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is q(!x ) = 3x21 2x22 x23 4x1x2 4x2x3, where !x = [x1; x2; x3]t positive de nite?
To determine whether q(!x) = 3x21 2x22 x23 4x1x2 4x2x3 is positive definite, we need to check the signs of the eigenvalues of the matrix Q defined by Q_ij = ∂^2q/∂xi∂xj evaluated at !x.
Using the expression for q(!x), we can compute the Hessian matrix of q as follows:
H(q) = [6 4 0;
4 0 4;
0 4 0]
Evaluating this matrix at !x = [x1; x2; x3]t, we get:
H(q)(!x) = [6x1+4x2 4x1 0;
4x1 0 4x3;
0 4x3 0]
Next, we need to find the eigen values of this matrix. The characteristic polynomial of H(q)(!x) is given by:
det(H(q)(!x) - λI) = λ^3 - 6x1\(λ^2\)- 16x3λ
The roots of this polynomial are the eigen values of H(q)(!x). We can solve for them using the cubic formula or by factoring out λ:
λ( \(λ^2\)- 6x1λ - 16x3) = 0
Thus, we have one eigen value at λ = 0 and two others given by the roots of the quadratic equation:
\(λ^2\)- 6x1λ - 16x3 = 0
The discriminant of this quadratic is Δ = 36x\(1^2\) + 64x3, which is always non-negative since x is positive definite. Therefore, the quadratic has two real roots if and only if 6x ≥ \(1^2\)16x3, or equivalently, 3x \(1^2\) ≥ 8x3. This condition ensures that both eigenvalues are non-negative.
In conclusion, q(!x) is positive definite if and only if 3x\(1^2\)≥ 8x3.
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