Monday
January 23, 2017

# Posts by ALEX

Total # Posts: 3,627

Linear Algebra
Hi, well I have the next question: How can I show that the sum of two eigen values is not another eigen value? I know that I can give an example, but is ther another way to solve?, please help...
January 20, 2017

Accounts
I have prepared Income Statement, Statement of Stockholders Equity and Balance Sheet of company and need to know if it is correct or not. imgur. com/HHPU5GO imgur. com/f2VQfNu imgur. com/QqBAarR
January 20, 2017

physics
Place a coin on top of a sheet of paper on a desk or table. Pull the paper horizontally with a quick snap. What concept of physics does this illustrate?
January 17, 2017

Math
A marketing expert determines that sales of television sets an be increased by 3 sets per week for each \$20 decrease in price. Weekly sales average 18 sets at \$440 each. What price should be given in order to receive \$10,800 in revenue?
January 15, 2017

Science
Classify the chemical equation as a combination/synthesis , single replacement, or combustion NaCl(aq) + AgNO3(aq) à AgCl(s) + NaNO3(aq)
January 11, 2017

Geology and soils
An oven tin containing a sample of moist soil was weighed and had a mass of 37.82 g; the empty tin had a mass of 16.15 g. After drying, the tin and soil were weighed again and had a mass of 34.68 g. Assuming GS = 2.70, determine the void ratio of the soil if the air-void ...
January 10, 2017

Physics
84grams
January 8, 2017

History
1.Why did the Portuguese think that they could find an easier way to reach Asia? * a.They had alliances with European nations to send out expeditions. b.They had a large country and a long tradition of Asian exploration. c.They had a large fleet and had defeated Spain in ...
January 4, 2017

History
I Got the others right but i need help with these.----> 1.Why did the Portuguese think that they could find an easier way to reach Asia? * a.They had alliances with European nations to send out expeditions. b.They had a large country and a long tradition of Asian ...
January 4, 2017

help
What brought traders to canada?
January 3, 2017

Maths
Show that: (3x-1)(x+5)(4x-3) = 12x^3 + 47x^2 - 62x +15 for all values of x. (3x-1)(x+5)(4x-3) = (?????)(4x-3) Expand into 6 terms: ???????? Simplify: ???????? Thank you.
January 3, 2017

Math
A pendulum of Length L cm has time period T seconds. T is directly proportional to the square root of L. The length of the pendulum is increased by 40%. What is the percentage increase in the time period? ???????? Multiplier for increasing L = 1.4 Multiplier for increasing T...
January 3, 2017

American government
Aluminium sulphate when dissolved in water forms aluminium hydroxide and sulphuric acid.Since, aluminium hydroxide is insoluble in water, a clear solution is not obtained. Al2(SO4)3 + 6H2O ?2Al(OH)3 + 3H2SO4Aluminium Aluminiumsulphate Hydroxide
January 1, 2017

Math
write the percent as a decimal and a fraction 365% Too confusing
December 29, 2016

Math
In a candy bar, 108 calories are from sugar. There are 240 calories in the candy bar. What percent of the calories are from sugar? I think the answer is 60.
December 29, 2016

Chemistry
What mass of zinc metal would be needed to produce 0.5 litre of hydrogen gas from dilute HCl
December 27, 2016

QUADRILATERAL MATHS
never mind i got it- it's just like matching
December 22, 2016

QUADRILATERAL MATHS
I am not sure how you got 40+4 and 30+35 btw thx for your help
December 22, 2016

QUADRILATERAL MATHS
Equation of the perpendicular bisector of line segment AB: y=5x/3 - 4 Coordinates of point D = (66/7, 82/7) Gradient of BC = 5/3 Coordinates of point C = (8,15) These are the right answers but how to find the area of quadrilateral? Apparently the answer is 629/14 square units
December 22, 2016

QUADRILATERAL MATHS
ABCD is a quadrilateral with angle ABC a right angle. The point D lies on the perpendicular bisector of AB. The coordinates of A and B are (7, 2) and (2, 5) respectively. The equation of line AD is y = 4x ? 26. find the area of quadrilateral ABCD
December 22, 2016

Physics
It seems 38J is incorrect too. Thanks though :)
December 18, 2016

Physics
A 5.0 kg block with a speed of 2.9 m/s collides with a 10 kg block that has a speed of 2.1 m/s in the same direction. After the collision, the 10 kg block is observed to be traveling in the original direction with a speed of 2.6 m/s. Suppose, instead, that the 10 kg block ends...
December 18, 2016

Physics
19.446
December 17, 2016

Sociology
Compare and contrast the similarities and differences of heterogeneity and diversity. Define each term and apply examples.
December 16, 2016

political science
1) Scenario: The President appoints Dan Evans to Senator Adams' seat when Adams resigns due to a personal scandal. This scenario is: a) Constitutional, because it is within the President’s powers to appoint Senators when one dies or resigns in the middle of his/her ...
December 13, 2016

calculus
Take the integral. The initial cost / fixed value (the omni-present +C) is 175. This equation is C(x). You want to know the cost of producing 8 units, so then calculate C(8).
December 10, 2016

chemistry
Industrial waste contains Zn(II) and cyanide. The waste is toxic to aquatic species like fish. 1- If the waste consists of water, Zn(II) and cyanide, what ligands might complex with Zn(II)? 2- Write chemical equilibria reactions the must be considered to determine toxicity of ...
December 10, 2016

Art History, college
Is there a difference between the Flamboyant style and the Late Gothic style of architecture?
December 8, 2016

Art History, college
Q:Describe, with specific examples, what kind of art the Hiberno-Saxons are best known for. Include a basic progression of this art-type’s development ? A: The kind of art that the Hiberno-Saxons are best known for is their illuminated manuscripts as many of the earliest ...
December 7, 2016

Trigonometry
Okay. Love the no help, now he thinks I'm stupid. My friend Nick is quizzing my on stuff I don't know. like this Given: A= 10km S30degreesW and B= 15km S40degreesW Find the resulting vector (magnitude and direction) of the combined vectors Please just help. He's 19...
December 7, 2016

Trignometry
Please Help!!! Given: A= 10km S30degreesW and B= 15km S40degreesW Find the resulting vector (magnitude and direction) of the combined vectors
December 7, 2016

Social Studies Pretest Lesson 1 Unit 7
Those answers are wrong. I got a 33 on my test.
December 7, 2016

Art History, college
Q:In which era did icons develop importance? A: I believe icons developed importance in the early 3rd century due to icons being associated with the early Byzantine and Eastern Orthodox Churches.
December 6, 2016

Math
The volume of a sphere is given by the formula: V = (4/3)(pi)R^3 Since we know V = 15000, this equation becomes 15000 = (4/3)(pi)R^3 Solve for R.
December 4, 2016

math
you are dealt 13-card bridge hand from a 52-card bridge deck. what is the probability that you will be dealt exactly 5 hearts? what is the probability that you will dealt at list 2 hearts? what is the probability that you will receive 5 hearts, 4 clubs, 2 diamonds, and 1 spade?
December 4, 2016

math
what divided by 7 equals 15
November 23, 2016

Algebra
A ball is thrown vertically upward from the ground with an initial velocity of 103 ft per sec. Determine what the maximum height will be
November 22, 2016

Physics
Thank you for your help!
November 19, 2016

Physics
Ah, you subtract .23 from .747. Thanks! But what about part b? Do you find when net work = 0?
November 19, 2016

Physics
A 3.20 kg block starts at rest and slides a distance d down a frictionless 30.0° incline, where it runs into a spring (Fig. 8-6). The block slides an additional 23.0 cm before it is brought to rest momentarily by compressing the spring, whose spring constant k is 443 N/m. ...
November 19, 2016

Math
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle ...
November 18, 2016

Math
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle ...
November 18, 2016

Statistics
Note: For part c, the probability statement should read P(xbar < 3500). The bar denotes sampling means.
November 17, 2016

Statistics
(A) From the problem statement, N(7400, 2900). P(X < 3500) = .0893 (B) ... .0893? (C) This is a test of means. For this we make a new distribution, N(xbar, s), where xbar = mu, s = sigma / sqrt(n). N(7400, 1674.32) P(X < 3500) = .0099
November 17, 2016

Difficult Math
Uh... I'm guessing that .2 means 20%? Because you can't have .2 of a card? But then the total cards you have sums to over 100% and welp.
November 17, 2016

Science
Not enough information. Work is defined as (the sum of) Force(s) dot displacement. So we'd need the direction of the displacement vector. I guess you could argue that "carry" implies perfectly horizontal displacement. In which case, W = 0J. In that case, the ...
November 17, 2016

Algebra
From the problem statement we derive a system of equations. 4a + 3b = 64 a + b = 19 There are a variety of ways to solve this, but I'll use substitution. Isolate a variable. a = 19 - b ... And substitute that into the other equation. 4(19 - b) + 3b = 64 76 - 4b + 3b = 64 -...
November 17, 2016

Statistics
From the problem statement, N(32, 7). (A) 2 years is equivalent to 24 months. We want to know how many watches will break on average. P(X < 24) = .1265 = 12.65% (ouch) (B) This statement asks that we modify the warranty so that less than 16% of watches are refunded. We use ...
November 16, 2016

Physics
Yeah. Set up your static equilibrium equations relative to another pivot. I would recommend doing it at the 100 cm mark, where F is, but it doesn't really matter so long as it's not at the 0 cm mark.
November 16, 2016

Physics
What's N supposed to be? The knife? If so, you would have to pick a different pivot and repeat the process for it.
November 16, 2016

Physics
Start by drawing a picture. You have a meter stick of supposedly uniform mass, so the force due to gravity should be in the geometric center, pointing down. We know on the left end we have an upwards force due to the knife, and at the 40 cm mark a weight. Let's pick the ...
November 16, 2016

English
Inscribed on. Gotta love those English idioms.
November 16, 2016

Physics
As the problem states, this is a conservation of energy problem, so E(initial) = E(final) Let's pick our coordinate system to be point at which the ball initially rests. This makes the initial potential energy 0. When the ball is at its highest point, the velocity is ...
November 16, 2016

6 grade math
So we know that the result of doubling a number and subtracting 27 gives 407. Since your teacher wants a guess and check table, let's just start guessing numbers around the 200 mark, since we know double the number at some point.
November 16, 2016

Statistics
The standard normal curve is N(0, 1). That 6.6& of the curve lies right to the desired z means that .944 of it lies to the left. Use the inverse norm function with the above data in a calculator or look it up in a table. z = +1.589.
November 16, 2016

Algebra
Two fair eight-sided rolled. If a two is showing on one of the die, what is the probability that the sum is six or less?
November 16, 2016

Geometry
You're doing it right. Exact answer just means to keep your answer in symbolic form-- keep your constants. pi * 4^2 * 9 = 144pi (exact) If we wanted the approximate answer, we could substitute pi = 3.14, and then you get 452.
November 13, 2016

Graphing Linear Equations and Inequalities
Pretend that the inequality is an equals sign, so y = 2x. This is a line with slope of +2, and it's x and y intercepts at the origin. Now we want y to be less than 2x. This is represented as the area above / right of the line. To prove this to yourself, you could always ...
November 13, 2016

statistic
I suppose it would depend on how you're defining "overpaying." Certainly, we can assume that the distribution of houses is N(650, 90), and from that, we can conclude that Sam paid an amount one standard deviation above the mean. Whether that is overpaying or not ...
November 13, 2016

physics
Yeah, you have the right process. After you calculate the net force in x and y directions, construct a right triangle by drawing your vectors head-to-tail. |------ | / | / | / | / theta The hypotenuse has a length of ~3188 by Pythagorean theorem. To calculate the angle, we use...
November 13, 2016

Data
We calculate the number of ways each nationality can order their members. This is simple permutations. Canadians: 3! = 6 Americans: 4! = 12 Mexicans: 2! = 2 However, we can also manipulate the order of our diplomats (i.e. Canada, America, Mexico v. Canada, Mexico, America). ...
November 13, 2016

math
By how much does 17 exceed the difference of 5 and -5?
November 12, 2016

Science
In a tennis match the player hits the ball to serve the ball travels 24m from the servers raquet to the opponents Raquet at an average speed of 40 meters per second.calculate the time taken
November 10, 2016

social studies
Boo is 100% right! But can anyone tell what to put for the last question? 25. How were the lives of white people in the North and South alike and different? (4 points)
November 10, 2016

Math
Suppose a tunnel is 44 feet wide and 22 feet high is in the shape of a parabola. A) Determinate an equation, f(x), of a parabola to represent this situation and B) provide a graph to support your work. Suppose lanes pass trought the tunnel that are each 12 feet wide. C) ...
November 9, 2016

economics
Economics
November 8, 2016

Math
The x-intercept of a graph is when y is 0. 5x - 12(0) = 60 x = 12 So our point is (12, 0). Likewise, the y-intercept is when x is 0. 5(0) - 12y = 60 y = -5 So our point is (0, -5). The distance between two points is given by the formula: Dist = sqrt{(x0 - x1)^2 + (y0 - y1)^2...
November 6, 2016

communications
what is the most distorted or misinterpreted topic on the internet?
November 4, 2016

Physics
A)A 100kg person is riding a 10kg bicycle up a 25degree hill. The hill is long and the coefficient of static friction is 0.9. How much force does the person have to apply in order for her to ride 10m up the hill at constant velocity? B) If the person now starts from rest from ...
November 3, 2016

math
Given that [sin(A-B)/cos(A+B)]=1/3[tan(A-B)], find the values of cosB if sinA=1/2
November 3, 2016

social studies
1.  How did Washington handle the war between Britain and France?  (1 point) The U.S. formed an alliance with France to fight against Britain. The U.S.&...
November 1, 2016

Physics
Six dogs pull a two-person sled with a total mass of 280 kg. The coefficient of kinetic friction between the sled and the snow is 0.080. The sled accelerates at 0.65 m/s2 until it reaches a cruising speed of 15 km/h. What is the team's maximum power output during the ...
October 30, 2016

Physics
A pile driver lifts a 450 kg weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of 1.5 m drives the pipe in 45 cm. What is the average force exerted on the pipe?
October 30, 2016

HCC
A manufacturer of hospital supplies has a uniform annual demand for 80,000 boxes of bandages. It costs \$10 to store one box of bandages for one year and \$160 to set up the plant for prduction. Haw many times a year should the company produce boxes of bandages in order to ...
October 30, 2016

social studies
explain how the civic virtues of the ancient romans inspired the founding fathers vision of how citizens should conduct themselves in the united states
October 27, 2016

english
Tanya's pet hamster likes sleeping behind the computer. I have to pick out the prepositional phrase and then identify its object.
October 25, 2016

history,college
What are some secondary sources and primary sources about Joan of Arc's impact on how Christianity viewed females after Joan's death?
October 24, 2016

Math
A rectangular shaped desk has a length of 36 inches and a width of 16 inches. A desk with a similar shape has a width of 24 inches. What is the length of this desk?
October 20, 2016

Math
A 6-foot person standing 15 feet from a streetlight casts a 10-foot shadow. Two similar triangles are formed. One triangle is formed by the person and the shadow that the person casts. A second triangle is formed by the streetlight and the ground from the base of the ...
October 20, 2016

Science
What was the answer???
October 19, 2016

math
the tallest woman who ever lived cast a shadow of 10 feet while a 3 foot vertical stick cast a shadow of 3' 11". how tall was the woman to the nearest inch?
October 18, 2016

Social studies
1, what was Alexander Hamiltons main reason for insisting all the nations debts be paid in full? So the country could borrow in the future So the country would be seen as a world leader Because many citizens needed the money Because the nation had a moral obligation to do so...
October 18, 2016

Art History, college
Q: How did the Babylonians make the Ishtar Gate blue (and all its other colors)? A: The Babylonians make the Ishtar Gate blue (and all its other colors) through the use of blue glazed enameled bricks for the blue which was thought to be made of the precious stone,lapis luzli, ...
October 16, 2016

Art History, college
Q:The Old Kingdom, or Old Dynasty, of Egypt is considered the golden age of Egypt. Using specific examples, explain why. A:The Old Kingdom, or Old Dynasty, of Egypt is considered the golden age of Egypt because of the monumental building efforts such as the funerary complex of...
October 16, 2016

Art History, college
Q:The Old Kingdom, or Old Dynasty, of Egypt is considered the golden age of Egypt. Using specific examples, explain why. A:The Old Kingdom, or Old Dynasty, of Egypt is considered the golden age of Egypt because of the monumental building efforts such as the funerary complex of...
October 16, 2016

Algebra
if tickets are sold for \$50, then 600 tickets are expected to be sold. For each \$1 reduction in price, an additional 20 tickets will be sold. Write an equation that gives revenue R from ticket sales when the ticket prices are reduced by "x" dollars.
October 10, 2016

History
All day long and in all places I am always fastening upon you, stirring you and persuading you and reproaching you. You will not easily find another like me. Use the passage to answer the question. 1. In the passage, what Greek philosopher describes his own method of seeking ...
October 10, 2016

History, college
What are some natural events mentioned in Robert Bartlett's book "The Natural and the Supernatural in the Middle Ages"?
October 10, 2016

calculus
Sorry, supposed to be from 0 to 2pi
October 6, 2016

calculus
use Simpson's with n=10 to approx. f(x)= x sin x, 0¡Ü x ¡Ü2¦Ð round to 6 decimal places I know I set up the calculation correctly like this: (pi/15)(f(0)+4f(pi/5)+2f(2pi/5)+...+2f(8pi/5)+4f(9pi/5)+f(2pi) I keep getting a negative answer but...
October 6, 2016

Social studies
Can someone check my answers 1, Which of the following was one way different regions of the country agreed? Support of slavery Support for the war of 1812 Support of foreign policies Support of economic stability?****** 2, which of the following was the main reason Spain ...
October 6, 2016

math
Write a compound inequality that each graph could represent
October 2, 2016

Psychology
In Schachter and Singer's experiment, participants who received epinephrine injections reported euphoria in a happy situation and anger in an insulting situation. Why were the results difficult to interpret? a) Placebo injections produced the same results as epinephrine. ...
October 1, 2016

psychology
Goals are most effective at motivating increased efforts if the goals are a) challenging (somewhat better than you have done in the past). b) flexible (such as "do your best"). c) private. d) easy. a is my answer
October 1, 2016

History
1. That is correct as the traditional range for the Sioux people was from the Dakotas to Wyoming. 2. That is correct because the Aztecs lived in a swampy and marsh filled environment which means farming in terraces would be the best option for crops surviving floods. 3. That ...
September 29, 2016

Math
There are 11 kids in your math class. 3 of them are girls and 8 of them are boys. There are 6 bananas and 12 apples in the bowl.
September 28, 2016

college, history
Yes I have but he is so vague about what he considers things being natural in the Middle Ages that I decided to ask for help and the same thing with the supernatural I've got the gist, I just need some rock-hard examples to make my essay that much better for both what he ...
September 28, 2016

college, history
What does Robert Bartlett in the "The Natural and the Supernatural in the Middle Ages" say about things about being beyond nature and what examples does he give? Also,what does Robert Bartlett in the "The Natural and the Supernatural in the Middle Ages" say...
September 28, 2016

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