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Posts by alex

Total # Posts: 3,725

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).

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 ...

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

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 ...

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...

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

Social Studies Lesson 1 Unit 7
thx xerano

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

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.

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.

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?

math
what divided by 7 equals 15

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

Physics
Thank you for your help!

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

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. ...

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 ...

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 ...

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

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

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.

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 ...

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 -...

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 ...

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.

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.

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 ...

English
Inscribed on. Gotta love those English idioms.

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 ...

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.

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.

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?

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.

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 ...

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 ...

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...

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). ...

math
By how much does 17 exceed the difference of 5 and -5?

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

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) ...

Math
b a b c b 100% thx

economics
Economics

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...

communications
what is the most distorted or misinterpreted topic on the internet?

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 ...

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

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.&...

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 ...

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?

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 ...

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

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

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?

math
b

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?

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 ...

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?

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, ...

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...

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...

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.

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 ...

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

Science
Yes

calculus
Sorry, supposed to be from 0 to 2pi

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...

math
Write a compound inequality that each graph could represent

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. ...

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

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 ...

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.

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 ...

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...

history,college
So in my shoes, Bob, would you rewrite what I have for my answer by including what you stated above?

history,college
What was the distinction between natural and supernatural events in the medieval world? (One of the questions that I have to answer in an essay regarding Robert Bartlett's book 'The Natural and the Supernatural in the Middle Ages) My answer: Natural events can be ...

History, college
Hi, I need help with making a stronger thesis statement that I'm going to use on my midterm assignment for Pre-Modern World History. Here's the thesis statement that I've come up with: The book 'The Natural and the Supernatural in the Middle Ages' portrays ...

people
Who is Jishha?

Algebra
Thanks, but I wanted someone to show me how to FIND the answer.

Algebra
1.Use the distributive property to simplify the expression. (-1)(4-c) Can someone show me how to work this out? I'm stuck. :C

chemistry
How many mL of 0.6 M H2SO4 solution are needed to react completely with 23.62 g of Fe2O3 in the following reaction?

maths
Three boys earned a total of 235.50.What was the averge amount earned per boy

Physics
A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.70 of her regular weight. 1).Calculate the magnitude of the acceleration of the elevator. Express your answer to two significant figures and include ...

Social Studies
Thanx connection students

Social Studies
a cd b c c c b b d a

World History
hey nikki im also in connexus maybe we could sometimes help each other if u have kik or skype thatd be cool

Math, ratio, part to part ratio etc...
There were 40 students per bus for the field trip

Math
Four more than twice Jason's age is the same as his age ten years from now. How old is Jason now?

Social Studies
i need help on this to

algebra
- 1/3 chance of choosing an O, as there are 6 letters in "school" and 2 of those are O's. 2/6 = 1/3

algebra
mary had 150 buttons more than gary at first. after mary used 190 buttons gary now has twice as many buttons as mary. find the number of buttons mary had at first.

algebra
mary had 150 buttons more than gary at first. after mary used 190 buttons gary now has twice as many buttons as mary. find the number of buttons mary had at first.

PE
100% THANKS :)

algebra
You also have two options for lodging. Write an equation FOR EACH OPTION that depicts the total cost of your stay, y, based on the number of days, x. Bilton Hotel: $100/night but you must pay an additional one-time fee of $40 for parking and other fees Triple Tree: $110/night ...

statistic
A survey found that​ women's heights are normally distributed with mean 62.5 in. and standard deviation 2.7 in. The survey also found that​ men's heights are normally distributed with a mean 67.9 in. and standard deviation 2.8 . Complete parts a through c ...

Physics
htt p://i .imgur. com/mXYFaDV .png this is the link, delete the spaces. Are any of these options correct?

Physics
Ok so this is just a small understanding problem, I do not want you to actually help me solve the problem, here it goes: A cylinder with mass 3kg slides on ice with its base surface at 5m/s and collides with an identical but stationary cylinder. The collision is elastic. After...

arithmetic sequence
find the 9th term of the arithmetic sequence with Asub1=10 and =1/2

arithmetic sequence
give the sequence of 5 term if the first term is 8 and the last term is 100

Chemistry
How much energy is released when 2.50g of NH3 rxs with excess N20 given the following 2NH3+3N2O -> 4N2_3H2O; DELTA(H)=-1010KJ. Please give work and setup :)

Chemistry
a 2.00 g sample of C6H402 is burned in a calorimeter whose heat capacity is 8kj/C. The delta T is +7.13 degrees C. What is the enthalpy change per mole?

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