Monday
September 22, 2014

Posts by mark


Total # Posts: 1,251

French
Are my answers correct? 1 Elle voit le film au cinéma. Elle _____ voit. le-my choice lui pour me 2 Nous parlons souvent à nos professeurs. Nous _____ parlons souvent. les leur-my choice y en 3 Elle va en Chine. Elle ____ va pour étudier la culture. lui y-...
September 29, 2012

physics
Let the radius of the circular segment be 92 m, the mass of the car 2393 kg, and the coefficient of the static friction between the road and the tire 0.9. Find the magnitude of the normal force N which the road exerts on the car at the opti- mal speed (the speed at which the ...
September 29, 2012

Math
Factor. y ^3 + 729
September 28, 2012

Math HELPPPP
(a) Which of the following are examples of the expression "difference of two cubes"? (Select all that apply.) (y2 - 9)3 3 - 4y 64 - y3 (y - 1)3 y3 - 27 27 - 3y y3 (b) Which of the following are examples of the expression "cube of a difference"? (Select all ...
September 28, 2012

Math
Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by the following equation. h = -16t2 + 34t + 15. How long does a team captain have to ...
September 28, 2012

Math
At the peak of a roller coaster ride, a rider's sunglasses fly off his head. The height h (in feet) of the glasses, t seconds after he loses them, is given by h = -16t2 + 16t + 1152. After how many seconds will the glasses hit the ground?
September 28, 2012

Math
The inclined ramp of the boat launch is 18 meters longer than the rise of the ramp. The run is 17 meters longer than the rise. How long are the three sides of the ramp?
September 28, 2012

physics
.A 5.5kg riffle fires an 11gram bullet with a velocity of 1000m/s. a. find the velocity of a riffle? b. if the shooter holds the riffle firmly with his shoulder what will be the velocity assume the mass of shooter is 120kg?
September 28, 2012

Senior Microeconomics
I need some help with my econ homework. Can someone tell me if I am right on these? 1. When graphing cross-sectional data, one should ________. A. place the various years on the X-axis B.always be drawn using a line chart C. investigate variables in a single time period D. ...
September 27, 2012

marketing
Binomial probability distributions are used in business, science, engineering, and other fields. Suppose you work for a marketing agency and have to create a television ad for Brand A toothpaste. The toothpaste manufacturer claims that 40% of the toothpaste buyers prefer Brand...
September 27, 2012

algebra II
Choose the equation in slope-intercept form for the line passing through each pair of points. (-4, -2) and (2, 3) y=-5/6x+14/3, or y=5/6x+4/3
September 25, 2012

math
i have 0.953 and need to round it off round two decimal places. Would this be consider 0.9
September 25, 2012

Math
What is the area of a square with the same perimeter as a regular hexagon with area 24 square root of 3. Can you please help me wodrk this?
September 19, 2012

Math
solve the ivp dy/dx = 1/(sqrt(1-x^2)) with initial condition y(sqrt(3)/2)=0
September 19, 2012

physics
A top fuel dragster covers the quarter mile in 4.5 seconds. what is its speed in miles per hour? please tell me step by step what to do.
September 18, 2012

math
Laura is a salesperson in a retail store and earns $65 per week plus 10% of her weekly sales. If Laura earned $200 one week, what were her sales that week
September 18, 2012

English
Also, we thought wrongly that (she, her) sitting in for him would decrease our work load. Is the correct answer ( her )
September 13, 2012

ALGEBRA
Solve 10x + 75 = 150. Round your answer to the nearest hundredth. A. x ¡Ö 1.63 B. x ¡Ö 1.56 C. x ¡Ö 1.75 D. x ¡Ö 1.88
September 13, 2012

Math
Pages in a book are numbered in typical fashion, starting with !. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur?
September 11, 2012

Math
Pages in a book are numbered in typical fashion, starting with !. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur? Can you help
September 11, 2012

Pizzazz
Theyfasineight
September 10, 2012

English
It could be (they, them) across the street. Is it they because it is used as a predicate nominative
September 10, 2012

English
The boss relies on (we, us) workers. Think it is us because us is the object of the prep. but then what is workers.
September 10, 2012

physics
Assume that a small sugar cube has sides 1 cm long. If you had a box containing 1 mol of cubes and lined them up side by side, how long would the line be (1 mol = 6.02 x 10^23)?
September 7, 2012

physics
A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. After flying through the air, the ball lands with a velocity of m/s at an angle of degrees above the x-axis
September 7, 2012

physics
A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the velocity of the ball at its maximum height?
September 7, 2012

physics
A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the initial velocity in the y-direction? Two sigfigs Remember...no units...but it would be in m/s
September 7, 2012

physics
A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the initial velocity in the x-direction? Two sigfigs Remember...no units...but it would be in m/s
September 7, 2012

Math
Pages in a book are numbered in typical fashion, starting with 1. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur?
September 6, 2012

algebra
Find g of f if f(x) = x + 7 and g(x) = 3x – 2.
August 31, 2012

Math
13xy(x+y)
August 24, 2012

stat/ probability
The height of males is normally distributed with a mean of 69 inches and a standard deviation of 2.5 inches. What is the probability that the height of a randomly selected male is between 66 and 71 inches?
August 15, 2012

College Chem
How many molecules of CH3OH will contain 3.20 x 10^23 H atoms?
July 16, 2012

College Chem
A mixture containing 5.0 g of H2 and 10.0g of O 2 is allowed to react in a 15.0L container at a constant temperature of 25.0 C. Once the reaction is complete, what will be the pressure of the excess gas inside the container?
July 16, 2012

Chem
DrBob222 - You're the greatest!!!! Thank you!
July 16, 2012

Chem
A mixture containing 5.0 g of H2 and 10.0g of O 2 is allowed to react in a 15.0L container at a constant temperature of 25.0 C. Once the reaction is complete, what will be the pressure of the excess gas inside the container?
July 16, 2012

Statistic
A training center claims that 75% of people taking national exam on achievement. In a sample of 90 people who took the exam only 39 have passed the exam. Use hypothesis testing to determine whether the training center claim is justified. Use 5% level of Significance
July 9, 2012

math
Multiply using Lattice Multiplication 23 x 45 379 x 24 379 x 450 Multiply by using the Russian Peasant Method 27 x 79 38 x 126
June 27, 2012

math
a recreation has the following dimensions. 15ft,33ft, 12ft, and 12ft. Carpeting will cost $ 1.50 per square foot. How many square feet of carpet will be needed and how much will it cost. Include correct units in each solution.
June 26, 2012

U.S. GOVERNMENT
All is correct but #5
June 25, 2012

Calculus
Given f(x)=x2+3x-5 on [-1,3] show f(x)= 10 without solving for x
June 11, 2012

Math
Given f9x0=x2=3x-5 on {-1,3} show f(x)= 10 without solving for x
June 11, 2012

business
thank you
June 6, 2012

business
I think ( a) is the answer, could you plz confirm
June 6, 2012

business
if you're developing a human resource inventory, you should exclude which of the following? a. names b. capabilities c. perpetual inventory d. education
June 6, 2012

business
thank you
June 6, 2012

business
is it B ??
June 6, 2012

business
its a gain regulated or conducted by oneself
June 6, 2012

business
if you want to turn self-directed gain into social and economic benefits for all, you should use a/an --------strategy. a. charitable aid society b. government c. visible hand d. invisible hand
June 6, 2012

Physics
An aerialist on a high platform holds onto a trapeze attached to a support by an 8.0-m cord. (See the drawing.) Just before he jumps off the platform, the cord makes an angle of 41° with the vertical. He jumps, swings down, then back up, releasing the trapeze at the ...
May 29, 2012

statistics
John wants to advocate for making study rooms available to students. In an effort to learn whether the time of day or the day of the week would be most important to consider in deciding when to make such rooms available, he polls a randomly selected group of students to find ...
May 20, 2012

Foreign languages
I left out this sentence. Thank you very much. Write an email to your friend (120 words) telling him/her about your week so far and how you are going to spend your summer holidays.
May 10, 2012

Foreign languages
I would like you to check my sentences, please. Thank you, Writeacher. 1) Describe Dr. Jekyll’s experiment, his process of transformation and the main contrasting features of Dr Jeyll’s new self. (I want to point out the difference between Dr Jekyll and Mr Hyde in ...
May 10, 2012

algebra
A rectangular pool is 25 feet long and 12 feet wide. If the length is increased by 2x what is the new length? How would you use a quadratic equation to solve this?
May 10, 2012

Foreign languages
Writeacher, can you check these statements, please? Thank you. 1) Is it possible to use the expression "lose the bus"? I know one should say "miss the bus" but I just wanted to know if "lose" is a mistake. 2) Things are getting better since the ...
May 10, 2012

math
what is the value of y when x=2 in the equation y=-4x - 5?
May 9, 2012

math
what is the value of y when x=2 in the equation y=-4x - 5?
May 9, 2012

Foreign languages
Thank you, Writeacher. I need to check a few other things. 1) Have you received the emails from my students? When will they get in touch with their parners? 2) When will you be in France? 3) As you know, we won't be able to start with the student exchange programme unless ...
May 9, 2012

math
simplify the following expression: 11!/3!8!
May 2, 2012

Chemistry
Which of the following compounds contains 57.5% sodium by mass? *NaI *NaOH *NaHCO3 *NaSO3
April 30, 2012

math
A sequence has t(sub1) = 5 and t(sub2) = 15 a. if the sequence is geometric, what is the common ratio? What do t(sub3) and t(sub4) equal? b. if the sequence is arithmetic, what is the common ratio? What do t(sub3) and t(sub4) equal?
April 28, 2012

science
The lock-and-key model holds that?
April 26, 2012

Physics
A 20-cm-diameter cylinder that is 40 cm long contains 50 g of oxygen gas at 20C. What is the number density of the oxygen? in m^-3 What is the reading of a pressure gauge attached to the tank? in kPa
April 25, 2012

physics
a car of mass 3000kg moving at 20m/s is suddenly brought to a stop when a deer crosses the road. if a braking force of 300,000 is needed to bring the car to a stop, what was the duration of the force?
April 24, 2012

English
will have, are going to see and will get? correct or not?
April 24, 2012

English
Hello! Need some help with these 3 sentences. They have to be filled with either simple future, going to future or present continuous 1. Son: Mum, what are we having for dinner tonight? Mum: I haven’t decided yet. But I think we __________(HAVE) pasta. 2. ...
April 24, 2012

math
write the particular equation of a quartic function that could, according to Descartes Rule of Signs have four positive zeros.
April 21, 2012

physics
Where must an object be placed to have a magnification of 3.74 in front of a converging lens of focal length 14.1 cm?
April 11, 2012

Trigonometry
Solve the equation sin^2x-cos^2x=0 over the interval [0, 2pi). Having trouble getting started.
April 1, 2012

English
Hello Any suggestions for a game? English learners (15 year olds) The class lasts for 20 minutes. They don't want anything with grammar, vocabulary and so on. They said they want to play something! Do you have something from your classroom?
March 29, 2012

chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
March 29, 2012

chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
March 29, 2012

chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
March 29, 2012

chemistry
calculate the ph of 20 ml of .1M NaOH to 40 ml of acetic acid
March 29, 2012

student
an average length of 2 inches and a standard deviation of .005 inches. What is the 95% confidence interval for the length of these screws?
March 26, 2012

science
are you from QUT? because that question is on the assignment
March 20, 2012

statistics
7. The average length of time per week that students at this university spend on homework is normally distributed with a mean of 18 hours and a standard deviation of 3 hours. If Diane spends more time on homework each week than 75% of students, what is the minimum time she ...
March 20, 2012

math
If (x + 2) is a factor of m^2x^4 + 5mx^3 + x^2 – 7x – 2, find m. (4 marks)
March 20, 2012

math
Find the slope of the secant to the curve f(x) = -2logx + 3 between: (1 each) i) x = 1 and x = 2 ii) x = 1 and x = 1.5 iii) x = 1 and x = 1.1 vi) x = 1 and x = 1.01 b) Extend the result from part a to determine the slope of the tangent to the curve at x = 1 accurate to 3 ...
March 19, 2012

math
Determine the value of each of the following logarithmic expressions. Do not change bases. A) log8 4 <----- 8 is subscript b)log 1/3 27 <---- 1/3 is subscript
March 19, 2012

Sta
It is pretty common across most schools to find the grades at the MBA level divided between A’s and B’s. As such, you expect the mean GPA to be around 3.50. Using the sample of 200 MBA students, conduct a one-sample hypothesis test to determine if the mean graduate ...
March 17, 2012

algebra
If you purchase an item for 1,272 at an interest rate of 9.8%, and you finance it for 1 year, how much is the amount of add -on interest?(round your answer to nearest dollar.)
March 14, 2012

Statistics Question (Confidence Interval)
A sample of 15 recent college graduates found that starting salaries for attorneys in New York City had a mean of $102,342 and a standard deviation of $21,756. Construct a 95% confidence interval for the average starting salary of all attorneys in the city. A. (89869.82, ...
March 14, 2012

Physics
A particle travels 15 times around a 10-cm radius circle in 42 seconds. What is the average speed (in m/s) of the particle? = I think I use the v=(2pi*r)/T equation? Right?
March 13, 2012

English - Native speakers
so the problem is the tense or?
March 4, 2012

English - Native speakers
Question: Which 2 answers are correct? Which is not and why? 1. Sorry, I can't. I'm seeing my grandmother. 2.Sorry, I can't. I'm going to see my grandmother. 3. Sorry, I can't. I'll see my grandmother.
March 4, 2012

English
Hello How to explain to students the difference between may, might and could when it comes to possibility?
February 28, 2012

Physics (IMPULSE)
A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. The same cart again traveling at 0.3 m/s collides with a different stationary object. This time the cart is at rest after the collision. In which ...
February 27, 2012

Physics
A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. The same cart again traveling at 0.3 m/s collides with a different stationary object. This time the cart is at rest after the collision. In which ...
February 27, 2012

Physics
A 0.1-kg object is traveling to the right (in the positive direction) with a speed of 2 m/s. After a 0.2 s collision, the object is traveling to the left at 3 m/s. What is the magnitude of the impulse (in N-s) acting on the object? The answer must be positive.
February 27, 2012

chemistry
4KCl + 4HNO3 + O2 ==> 4KNO3 + 2Cl2 + 2H2O I meant from * combustion decomposition synthesis single replacement double replacement
February 26, 2012

chemistry
4KCl + 4HNO3 + O2 ==> 4KNO3 + 2Cl2 + 2H2O what kind of reaction is this?
February 26, 2012

chemistry
Potassium nitrate is made by adding potassium chloride to hydrogen nitrate in the presence of oxygen gas. Along with the potassium nitrate, chlorine and water are produced. How would write the equation?
February 26, 2012

physics
A 1.50 103-kg car starts from rest and accelerates uniformly to 18.5 m/s in 11.3 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. 1 W (b) Find the instantaneous power output of the engine at t = 11.3 ...
February 24, 2012

physic
A projectile is fired from the origin (at y = 0s m) a shown in the figure. The initial velocity components are v 0x = 940 m/s and v 0y = 96 m/s. The projectile reaches maximum height at point P, then it falls and strikes the ground at point Q. In Fig. 3.1, the y-component of ...
February 22, 2012

chemistry
what did amedeo avogadro contribute to the atomic theory?
February 21, 2012

math
Transform the following. Do not evaluate. log (3*4) log 3^4
February 19, 2012

math
and show work
February 16, 2012

math
4x-y=3 4x+y=1 sorry
February 16, 2012

math
2x+3y=3 3y=5-2x 4x-y=3 4x=y=1 solve and explain please
February 16, 2012

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