Monday
July 27, 2015

Posts by Alex


Total # Posts: 3,031

Algebra
m+7/m^2+4m-21
July 26, 2015

Chemistry
Why is the rate determining step the slowest step?
July 9, 2015

American History
What caused the King Philip's war? Can you briefly explain or send me some links to sites.
July 7, 2015

personal finance
You purchase a car $22,000. The interest rate is 5% and you decide to pay over a period of 5 years. What is your payment?
July 5, 2015

physics
You push against a steamer trunk at an angle of 33° with the horizontal . The trunk is on a flat floor and the coefficient of static friction between the trunk and floor is 0.55. The mass of the trunk is 43 kg. What is the minimum magnitude of force that will allow you to ...
June 23, 2015

Public speaking
Saying "gonna" instead of "going to" is an issue of: A. Body movement B. Eye contact C. Articulation D. Timing
June 18, 2015

Physics
A projectile of mass 0.636 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.8 m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and strikes the ...
June 16, 2015

Physics
Three blocks of mass 10kg, 20kg, 15kg respectively are being pushed in a row on along a horizontal surface with constant velocity by a force applied to the 10kg block.The coefficient of kinetic friction between each of the blocks and the surface is 0.18. What is the magnitude ...
June 16, 2015

physics
A jetliner is traveling east from Seattle to Chicago, a distance of 1,750 miles. The jetliner travels at an average air speed of 620 mph relative to the air. At the jetliner's altitude, the wind is blowing 46 mph to the east. How long does the journey take?
June 15, 2015

physics
An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that ...
June 15, 2015

physics
A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration
June 15, 2015

physics
Hot air balloon A is rising upward a rate of 5.0 m/s. A passenger aboard balloon A observes balloon B rising upward at a relative rate of 7.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.
June 15, 2015

physics
A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?
June 15, 2015

Calculus
So don't write cos x = 0 and sin x = 0 ?
June 15, 2015

Calculus
Okay
June 15, 2015

Calculus
Yes, so what work do I need to show how I got a Absolute Maximum at pi/2 and 3pi/2
June 15, 2015

Calculus
To show how I got the answer, is the work sufficient? f(x)= sin^2(x) f'(x)=2sinx(cosx) = cosx(2sinx) cosx=0 sinx=0 f(0)=0 f(pi)=0 f(pi/2)=1 f(3pi/2)=1 Absolute Maximum is at pi/2 and 3pi/2
June 15, 2015

Calculus
On the closed interval, [0, 2*pi], find the absolute maximum of the function f(x)= sin^2(x)
June 15, 2015

Calculus
-3/2 feet per minute I meant
June 15, 2015

Calculus
Is this right? 1.5 ft = dr/dt 2x dx/dt + 2y dy/dt = 0 2(18)(2) + 2(24)= 0 72 + 48 dy/dt = 0 48 dy/dt = -72 dy/dt = -72/48 = -3/4 feet per minute
June 15, 2015

Calculus
36 dx/dt + 48 dy/dt = 0 48 dy/dt = -36 dx/dt dy/dt = -.75 or -3/4
June 15, 2015

Calculus
So what's next to find the rate at which the ladder is moving toward the building when it is 18 ft from the wall?
June 15, 2015

Calculus
A ladder 30 ft. long is leaning up against a building. If the top of the ladder is being pulled up the wall of the building at a rate of 1.5 feet per minute, find the rate at which the base of the ladder is moving toward the building when it is 18 feet from the wall.
June 15, 2015

French, foreign languages
Hi the following sentences are basically unscrambling them in the first place and then putting the sentence in order. If when looking through my unscrambled sentences and you see something wrong with the grammar or something of that nature that does not make the sentence ...
June 14, 2015

French, foreign languages
Hi, This are my answers using verbs from a list provided in the assignment in the future. If something within the sentences or if I have used a verb wrong please let me know and if possible tell me a correction I can make to make it more understandable or more grammatically ...
June 14, 2015

French, foreign languages
I need help understanding the present subjunctive in French and also the usage of Il faut in said sentence
June 14, 2015

Math
Byron’s house has a roof with dimensions shown. (Roof: 1m Height, 7m Hypotenuses, 12m length) He knows that the average rainfall in his suburb is 30cm per year. Byron would like to install a cylindrical rainwater tank to hold the water that runs off the roof. The tank is ...
June 14, 2015

French, foreign languages
I need help completing an assignment that includes completing sentences from a reading. T The questions have my answers within them to complete the sentence. Once you have read the the questions with my answers within the questions and you see something wrong with my answers ...
June 13, 2015

MWS
:)
June 13, 2015

MWS
well then that can be the answer thxs
June 13, 2015

MWS
First i thought it was new companies and now i have second thought i think it is now trade organizations what do you think
June 13, 2015

MWS
In recent times, Latin American countries have tried to improve their economies by forming these. Need help
June 13, 2015

French, foreign languages
Hi, Can you please check my sentences to see if I have the used verbs that are in the conditional correctly and also if they do not make sense tell me what I did wrong and if possible tell me what corrections I should make. Here are my sentences and the questions: Dans un ...
June 13, 2015

French, foreign languages
Hi, I desperately need help with double object pronouns in French. Here are questions that I am working on and I can't make heads nor tails of them: L'agence de voyages a envoyé les billets d'avion à mes parents. Mes parents ont acheté de ...
June 13, 2015

French, foreign languages
What verbs are in the conditional in French as I need it for an assignment that I am working on: 1.Dans un monde idéal, il n'y... 2. Vous n'avez pas d'argent? À votre place (In your place), je/j'... 3.On n'a pas cours lundi. On... 4.Dans un ...
June 13, 2015

MWS
well then thanks for the help i think i got it from here
June 12, 2015

MWS
because there were more job opportunities
June 12, 2015

MWS
Why has the sunbelt experienced growing populations over the past decades?
June 12, 2015

French, foreign languages
Here is what I think number 2 is : Mes parents achete les leur a mi soeur et a moi. For number 3 I have: Nous avons demande les leur visas aux différents consulats.
June 12, 2015

French, foreign languages
Hi, I desperately need help with double object pronouns in French. Here are questions that I am working on and I can't make heads nor tails of them: L'agence de voyages a envoyé les billets d'avion à mes parents. Mes parents ont acheté de ...
June 12, 2015

science
) If an ocean is opening at a rate of 5 cm/year and it has been doing so at the same rate for 10 million years, approximately how wide is that ocean?
June 12, 2015

Math
Cheers Steve.
June 10, 2015

Math
If f and g are functions defined for all real numbers, and f is an odd function, then f ∘ g is also an odd function. Justify. I wrote false cause for example if f = x^3(odd) and g=x^2(even) the fog is even.
June 10, 2015

Physics
A race car travels on a flat circular track at the maximum possible speed without slipping. If the radius of the track is 39m and the coefficient of friction is 0.73, how long (seconds) does it take the race car to complete 5 laps?
June 9, 2015

math
balance on an initial investment of $1,500 over 25 years at 5% APR. After 10 years about how much interest has the investment earned
June 6, 2015

Calculus
Describe the solid whose volume is represented by the following definite integrals. The integral of 2pi(x-1)e^x from 2 to 7.
June 5, 2015

Social Studies
opps wrong disscution
June 4, 2015

Social Studies
ok ok ok ok i did read
June 4, 2015

language arts
not going to help anymore bad at helping people at least i tried
June 4, 2015

language arts
iris is my sister
June 4, 2015

language arts
now i am getting really confused
June 4, 2015

language arts
no this is alex
June 4, 2015

language arts
i agree it is awesome but the ending i was just made
June 4, 2015

language arts
opps wrong name
June 4, 2015

language arts
do you still want to learn more about it
June 4, 2015

language arts
never mind i still have the book
June 4, 2015

language arts
i consider it as horrible ending becasue there is no series and i do not have the book anymore although i wish i did
June 4, 2015

language arts
well in the book it says that well i think it had said that it is inportant so he does run away but with the younger brother then at the end it has a horrible endng
June 4, 2015

Social Studies
United States that American settlers were destined
June 4, 2015

French, foreign languages
Salut, I am taking French 20 through ALDC via VHLCentral and I am having trouble with 5 questions of Lesson 2B-Enregistrez. I have the answer for question 1. But for the other 5 I do not have a clue can someone please help me with this? If someone has done this course in the ...
June 3, 2015

Math: 5th Grade
A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she start with? You must use a bar model to solve this problem.
June 1, 2015

Math
prove: sec^2(x)=1+tan^2(x)
June 1, 2015

Math
'Write as a piecewise defined function.'
June 1, 2015

Math
Can someone please help me with piecewise functions. I know what they are but when it gets to advanced i have ttrouble. s(x)= /x-2/ + /x-3/ + /x+1/ (/ / = 'modulus') Write as a piecewise defined function. Have no idea tbh. Thanks
June 1, 2015

art
setting up a photograph to control the lighting, the subjects position, and the angle of the photograph is an example of which artistic technique A.) improvisation B.) staging C.) photo editing d.) cropping
May 29, 2015

Physics
On a flat golf course, a golf ball lies 12m from the base of a lamp post. A golfer hits the ball with a club, giving the golf ball an initial velocity of 18 m/s. At 2.9 seconds, after being hit, the golf ball strikes the top of the lamp post. How high (m) is the lamp post?
May 26, 2015

chemistry
how many grams of solid magnesium nitrate should be added to 5.0 grams of solid sodium nitrate in a 500 mL volumetric flask in order to produce an aqueous 0.25M solution of NO3- ions (once the flask is filled to the 500mL volume line)? No idea where to start for this question.
May 25, 2015

Foreign language, French
I also need help understanding what the speaker for Lesson 4A Decrivez is saying because she kind of mumbles and I can't catch it. If someone is currently doing the course ( the course is French 2) that will be ideal but any and all help I will find acceptable. Thanks (Merci)
May 25, 2015

Foreign language, French
I need help with speaking portion of the VHL Central Lesson 2B Enregitrez as I can't really hear the speaker quite properly. If someone is currently doing the course ( the course is French 2) that will be ideal but any and all help I will find acceptable. Thanks (Merci)
May 25, 2015

Math
It did help but not sure if they are two different experiments cause your are comparing the effectiveness of each weed killer. Also not really sure on how to draw the flow chart for the design.
May 23, 2015

Math
And what if i'm having problems cause i did not attend class for these? Anyways From what i can figure out: a) The explanatory variables would be the actual weed killers (A and B) and the different type of weeds themselves... so two explanatory variables ?.. weird? ...
May 23, 2015

Statistics
So can you confirm if this is good enough? (4marks) Sample size is a very important factor in terms of the test of significance. Increasing the sample size increases the power of a significance test. Here the 'power' of a significance test measures its ability to ...
May 23, 2015

Statistics
The interpretation of a test of significance can depend on the sample size and the practical context of the test. Write a short explanation of how sample size can affect the decision about statistical significance and whether or not the result is of any practical significance.
May 23, 2015

Physics
An object is placed 20.0 cm to the left of a convex lens with a focal length of +8.0 cm. Where is the image of the object? A)28 cm to the right of the lens B)13 cm to the left of the lens C)13 cm to the right of the lens
May 21, 2015

help
The sum of two numbers is 20. One number is 3 times the other. Find the numbers.
May 20, 2015

math
The Bishop's Peak 4-H club is having its annual fundraising dinner. Adults pay $35 apiece and children pay $20 apiece. If the number of adult tickets sold is twice the number of children's tickets sold, and the total income for the dinner is $1,890, how many of each ...
May 20, 2015

math
2 N 11D ?
May 20, 2015

math
Diane has $1.20 in dimes and nickels. She has a total of 13 coins. How many of each kind does she have?
May 20, 2015

physics
Work=change in potential energy therefore W=mgh = 75kg*9.8m/s^2*1.75m = 1286.25 J
May 19, 2015

Calculus
The following definite integral gives the area of the region between the graph of the function f(x) = Icosx - x^2I (I=modulus), the x-asis, and the lines x=-2 and x=2. the integral of mod cosx - x^2 from -2 to 2. Describe a different region whose area is given by this integral...
May 19, 2015

Calculas
and this got me to Galagan's answer of 4*pi... but still not sure so don't take my answer for it Galagan.
May 19, 2015

Calculas
hhmmmm... i used the equation v=integral of pi*y^2 from a to b.
May 19, 2015

Math
Simplify -5x-5y+3+x+2y-3.
May 14, 2015

Computer science
Write the pseudocode for a method that receives as input the cost of a meal, and then adds a 9% tax rate, and then outputs a 15% tip on top of the price+tax
May 13, 2015

Science
When a water wave with a positive amplitude of one meter meets another water wave with a negative amplitude of one meter, what will be the result? Explain.
May 11, 2015

Science
What is the formula for the frequency of visible light? Using this formula, explain what will happen to the frequency when yellow light (580 nanometers) is slowed down slightly when it passes through a crystal.
May 11, 2015

Chemistry
A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+ half-cell. Calculate [Pb2+] when [Mn2+] is 2.1 M and Ecell = 0.13 V.
May 4, 2015

history
What geographical advantage does the Italian landscape have over the Greek landscape?
April 29, 2015

history
How long did the Byzantine Empire last?
April 29, 2015

science
How much heat is added to 10 g of water when you start from room temperature and heat it to its boiling point?
April 27, 2015

Social Studies Please Help!!!
That makes a lot more sense....
April 27, 2015

Social Studies Please Help!!!
My reasoning behind changing my name was to see if alphabetic order mattered, but it doesn't..... just wanted to let you know....(=
April 27, 2015

Social Studies Please Help!!!
(=
April 27, 2015

Social Studies Please Help!!!
1) Which of the following most directly made possible the Age of Exploration? A) hydropower B) caravel C) aqueduct D) wind turbine 2) Which region of Western Europe experiences an arctic climate. A) the Iberian Peninsula B) Italy and Greece C) the British Isles D) Northern ...
April 27, 2015

Chemistry
One mole of N2 and 3 moles of H2 are placed in a flask at 375 degree celsius.? Calculate the total pressure of the system at equilibrium if the mole fraction of NH3 is found to be 0.21. The Kp for the reaction is 4.21 x 10 raise to -4
April 22, 2015

Science
The effect _______ explains how fast air moves across a surface, the ____ pressure that presses on that surface. In contrast, the more ____ that air moves, the more of _____ there will be. I'm sorry that it might not make sense, I translated it from French. I tried using ...
April 21, 2015

Math
Hi again. Just realised that i got B wrong. So it means i need that too. Just to clarify (b) Show that if x and y are related by the equation √x + √y = 1 then dy _____ dx= 􀀀-√(y/x) _ _ I got -√y/-√x.
April 21, 2015

Math
In this problem we consider drawing some straight lines which form a nice pattern. Consider joining the point (0.1,0) to the point (0,0.9) by a line segment; then joining (0.2,0) to (0,0.8) by a line segment; and so on. In general, consider joining the points (a,0) and (0,b) ...
April 21, 2015

history
Gaul is the Roman term for what modern country?
April 20, 2015

Math
7. You are having a discussion about sequences with your classmate. She insists that the sequence 2, 3, 5, 8, 12 must be either arithmetic or geometric. Is she correct or incorrect? Explain.
April 17, 2015

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