Wednesday
November 26, 2014

Posts by jamie


Total # Posts: 780

chemistry
An ice-bath made with sodium chloride will be 9 ± 1 oC when the solution is about 23% sodium chloride by mass. The density of solid sodium chloride is about 2 g/cm3. What volume of solid NaCl would you add to 200 g water to make a 23% NaCl solution? ANY HELP WOULD BE ...
February 13, 2014

Math
34
February 11, 2014

Statistics
If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...
February 7, 2014

Statistics
A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
February 7, 2014

Statistics
A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
February 7, 2014

physics
One gram of nickel has 1.026 × 1022 atoms, and each nickel atom has 28 electrons. How many electrons are contained in 6.00 g of nickel? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons
February 7, 2014

chemistry
2)Tf = (0.00089 +/- 0.00008) * (13 +/- 2) + (19.627 +/- 0.004) Tf = (0.012 +/- 0.002) + (19.627 +/- 0.004) Tf = 19.639 +/- what value?
February 7, 2014

physics Work unit
1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
February 1, 2014

Physics Work unit
1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
February 1, 2014

Chem
Calculate the pH of a solution obtained by mixing 50 mL of 0.75 M CH3COOH with 15 mL of 1.6 M NaOH. (Ka of CH3COOH is 1.8 x 10-5)
January 23, 2014

Math
Thanks so much!!
December 10, 2013

Math
Sugar comes in 2 pound bags and flour comes in 5 lb bags. Thomas bought 3 more bag of sugar than flour and the total weight was 48 pounds. How many bags of sugar and flour did Thomas buy?
December 10, 2013

math
A statistic professor plans classes so carefully that the lengths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class period time is less than 51.75 minutes
November 29, 2013

Statistics
A statistics professor plans her classes so carefully that the lengths of her class are uniformly distributed between 46.0 and 56.0 minutes. Find the probablity that given class period runs less than 51.75 minutes
November 27, 2013

Algebra 1 (Reiny or Kuai)
jason wants to buy his brother a comic book. If he buys it online it costs $3.50, but if he buys it in the store there is a 20% markup. How much does the comic book cost in the store?
November 4, 2013

Math
1/4
October 29, 2013

edu 650
The idea of Gardener’s theory of multiple intelligences suggests that there are specific intelligences that are inherent in all individuals. The author, however, suggests that a preferred style may not necessarily be the best way an individual learns. With that in mind, ...
October 21, 2013

Math
A baseball pitcher has pitched a total of 25 innings so far during the season and has allowed 18 runs. At this rate, how many runs, to the nearest hundredth, would he allow in nine innings? This number is called the pitcher’s earned run average, or ERA. b. Randy Johnson ...
October 7, 2013

Chemistry
I am trying to figure out the molecular, ionic, and net equation for this question. HCl reacts with the precipitate formed from mixing Ni(NO3)2 and NaOH . This is what I got for the molecular but it is saying it wrong. Please help. Thank you. HCl(aq) + Ni(NO3)2(aq) + NaOH(aq...
October 5, 2013

Math HELP!!
The water level of a lake decreases by 6 inches over 3 years. What is the mean yearly change in the water level?
September 23, 2013

Chemistry
Please explain how what the X g NaCl should be? I am not following this completely! Thanks I got the answer for mass of H20 to be 9.337*10^23 g
September 8, 2013

Chemistry
If the volume of ocean water 7.41*10^20 L contains 2.9 percent sodium chloride ("salt") by mass and the density of the water is 1.26 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000 lb, 1 lb = 453.6 g) Calculate the mass of sodium chloride in kg
September 8, 2013

algebra
when sandy looked out at the school parking lot,she noticed that for ever 9 minivans there were 5 other types of vehicles.If there were 168 vehicles in the parking lot,how many of them are not minivans?
August 27, 2013

Physics
A uniform beam of length L = 7.80 m and weight 4.05 102 N is carried by two workers, Sam and Joe, as shown in the figure below. Determine the force that each person exerts on the beam. (Sam is 1m from one end of beam and joe is 2m from the opposite end.)
July 30, 2013

CHEM
how many moles of oxygen are present in 11.0 molecules of NaClO4? AND HOW DO I WORK IT OUT
July 18, 2013

math
3/4-1/2n=4/5 Please don't give me the answer, just show me the steps to solve it
July 15, 2013

math
-6=4x/7+2
July 15, 2013

algebra
perform the subtraction (8a+2b)/(8a^(2)+2ab-3b^(2))-(a+2b)/(16a^(2)-ab^(2))
July 5, 2013

Physics
A 39.2-kg boy, riding a 2.39-kg skateboard at a velocity of +4.97 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.48 m/s, 9.54° above the horizontal. Ignore any ...
June 30, 2013

health
how do you lose weight
June 27, 2013

math
Yes, painting can be 12 to 14 inches . Lengths do not matter . Thank you
June 2, 2013

math
Want to hang a painting on a wall that is 17and 5/8 inches high and I want 2 inches left on top and bottom of painting showing. Where would I hang it at?
June 2, 2013

Chemistry
Say you have a question asking to rank the oxidizing strength of several different metals. When you look at the reduction table to determine the strength, there are metals with different oxidation states. For example: Fe3+ + 3e- => Fe ; Eo = -.04 Fe2+ + 2e- => Fe ; Eo...
May 21, 2013

Math
A squirrel is moving at a speed of 15 feet per second. At this rate, how long will it take the squirrel to travel one mile? Convert answer into minutes, to the nearest tenth.
May 9, 2013

algebra
A satellite dish has a parabolic cross section and is 6 ft deep. The focus is 4 ft from the vertex. Find the width of the satellite dish at the opening. Round your answer to the nearest foot. Thank you
May 1, 2013

Math
He was not late to the bus stop because 8:15 is just the digital way to say quarter after 8
April 22, 2013

Statistics
A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion. a) State the 95% confidence interval for ...
April 17, 2013

Statistics
A purchasing agent at the Kelly Bread Company wants to estimate the mean daily usage of rye flour. She takes a sample for 50 straight days and finds that the sample mean is 180 pounds with a sample standard deviation of 38.5 pounds. a) State the 90% confidence interval for the...
April 16, 2013

Chemistry
I followed your direction and I calculated the solubility to be 40. Am I correct?
April 16, 2013

Chemistry
Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
April 16, 2013

chemistry
To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...
April 16, 2013

chemistry
To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...
April 16, 2013

chemistry
To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...
April 16, 2013

Chemistry
Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
April 16, 2013

Physics, diffraction, interference, help!
3.Blue light (λ = 450 nm) shines on a diffraction grating that has 4000 lines/inch. A.Calculate the angle of the fourth-order image
April 8, 2013

Physics, diffraction
1. Yellow light of wavelength 580 nm shines on a diffraction grating with 4000 lines/cm. A.At what angles do the first-order and second-order maxima occur?
April 8, 2013

physics
Three different forces produce the same displacement: the vector Delta(r) starts at the left edge of your computer monitor and the tip points to the right edge of your monitor in a horizontal orientation. The first force has a magnitude of 10 N and it is pointing straight up, ...
April 4, 2013

Math
Yes IT IS!!100% correct good job!
March 28, 2013

physics
A 1.03 kg mass is attached to a spring of force constant 10.6 N/cm and placed on a frictionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.525 m at a rate of 2.20 revolutions per second?
March 18, 2013

physics
You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 1/2 A of current through the light bulb and 5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 2.5 W. Assuming any resistors that you need, design...
February 26, 2013

Calculus
Never mind. I was able to figure it out.
February 22, 2013

Calculus
Find the derivative of f(x) = ln(13e^(5x) + 2)
February 22, 2013

Physics
A wire of cross-sectional area 5.00x10^-6 m^2 has a resistance of 1.75 ohm. what is the resistance of a wire of the same material and length as the first wire, but with a cross-sectional area of 8.75x10^-6 m^2? I really want to understand what to do here, so detailed steps ...
February 12, 2013

Algebra
A trapezoid when its height is h and the lengths of its bases are a and b. What is the area of a trapezoid when h = 6 meters, a = 5 meters, and b = 12 meters? Formula A = 1/2h(a+b) gives the area.
February 12, 2013

School For Human Rights
A student wants to prepare Halite. How much sodium can he use to completely react it with 30g of Chlorine gas?
February 4, 2013

physics
how much work (J) is done by friction when the mass is 150 kg and dragged for 10 m if the coefficient of sliding friction is .3?
February 4, 2013

Algebra
x-2y=.9 4x-3y=13.1 Solve using the substitution method.
February 1, 2013

Algebra
4x+y=42 6x-5y=50 Solve using the substitution method.
February 1, 2013

math
the product of three consecutive integers is 22 less than the cube of the middle integer. Find the integer.
January 31, 2013

Geometry
If you go to Eden a math tuition you will have the diagram for this question but if you do not there will be ... LET ME JUST GET TO THE QUESTION Question: what is the measure of MQ in the diagram shown?
January 25, 2013

floral design
One of your friends who works at a local public TV station knows that you wish to break into event-floral designing. She attended a party last week for which you had created an amazing set piece that surrounded a small dance floor. Impressed with your work, she asks you to ...
January 24, 2013

Math
Oh, never mind! 28 inches high /2 so you can find the area between ceiling and middle of painting.
January 20, 2013

Math
Oh, never mond! 28 inches high /2 so you can find the area between ceiling and middle of painting.
January 20, 2013

Math
Ughh....
January 20, 2013

Math
Hhow'd you get 14 inches though?
January 20, 2013

Design
What is the difference between the vegetative style and the landscape style of flower arranging? A. Vegetative arrangements group same-season flowers together, while landscape arrangements don't. B. The vegetative style features flowers as they're found in nature, ...
January 16, 2013

Design
Which design style encourages a complete manipulation of floral materials into unnatural geometric shapes and colors? A. Abstract B. New convention C. Ikebana D. New wave im thinking B
January 16, 2013

Design
What is the difference between layering and terracing? A. More depth can be achieved with layering than with terracing. B. In layering, the materials are more three-dimensional than in terracing. C. In layering, materials such as leaves can't be reversed to reveal ...
January 16, 2013

Design
_______ refers to the process of tying materials together to hold them in place in an arrangement. A. Binding B. Clustering C. Banding D. Grouping
January 16, 2013

Physics
A car traveling at 20 m/s accelerates at 7 m/s2 for 3 sec. How fast is it now traveling? Please help!
January 15, 2013

Trigonometry
In 2010, the population of a country was 70 million and growing at a rate of 1.9% per year. assuming the percentage growth rate remains constant express the population P, as a function of t, the number of years after 2010.
January 15, 2013

Math
The answer is... Wait, I think I just forgot. Ohh.... Never mind! The answer is: The test scores are 34,56,78,98. So the fourth test score is 98. Hope this helped
January 4, 2013

Heat Capacity
When a 3.25 g sample of solid sodium hydroxide was dissolved in a calorimeter in 100 g of water, the temperature rose from 23.9 C to 32.0 C. Calculate delta H (in kJ/mol) of for the solution process: NaOH (s) -> Na+(aq) + OH-(aq) Use a calorimeter heat capacity of Ccal = 15...
December 18, 2012

Math
-1/(x^3)-27 or -1=A(x^2+3x+9)+Bx+C(x-3) I'm trying to find the partial fraction decomposition. I think A=-1/21, but how do I find the right values to plug in for x to find B and C?
December 17, 2012

Physics
If you throw a ball straight upward at a speed of 24 m/s, how long will it take to reach zero speed? How long will it take to return to its starting point? How fast will it be going when it returns to its starting point?
December 12, 2012

English - writing
Is this a run-on sentence? Though I do believe we need to be useful, honorable, and compassionate to live a successful life, I would argue that the purpose of life is to be happy, but only through the aforementioned requirements can we achieve happiness, and thus, we may “...
November 28, 2012

Physics
Suppose there is a small hole (radius=0.0203) at the base of a large tank. If the height of water in the tank is 15m (a) what is the speed of water escaping through the hole? (b) Calculate the amount of water (in cubic meters per second) escaping the tank.
November 27, 2012

chemistry
5.49atm
November 26, 2012

math
How would you condense a logarithm expression into a single quantity if the logs have different bases?
November 20, 2012

algebra
What is (-2)^2 (-3)^2
November 19, 2012

Math
Theater has 108 seats, which are arranged in rows. The number of seats in each row is 3 less than the number of rows. How many rows of seats are in the theater.
November 14, 2012

algebra
Y^2-y-6
November 14, 2012

Business Calc
Determine when, to the nearest year, $3,000 invested at 5% per year, compounded daily, will be worth $10,000.
November 8, 2012

Math
Suppose that ln2=r. Use properties of logarithms to write the logarithm in terms of r. ln32=__
November 7, 2012

english
1. What about Thoreau’s night in jail made him angry? (1 point) The fact that his stay in prison was too short to make a point. The interference with his protest. The uncomfortable accommodations. 2. Why do the playwrights refer to their protagonist as “The Now ...
November 7, 2012

algebra
7 nickels to 22 dimes
November 4, 2012

Math
How do you simplify this? (x+3/x-6)-2/(x+3/x-6)+8
October 29, 2012

math
4((x/4)+5)-20 How do you solve this for x?
October 29, 2012

English.
2. worse than before he talked to virgil
October 28, 2012

chemistry
How many kilojoules of heat are released when 38.6g of CH4 reacts completely with O2 to form CH3OH at constant pressure?
October 28, 2012

math
(X`2-7x+10x`3+1) ÷(2X-1)
October 24, 2012

College Physics
two motorcycles of equal mass collide at a 90 deg. intersection. if the momentum of motorcycle A is 450 kg km/h west and the momentum of motorcycle B is 725 kg km/h south, what is the magnitude of the resulting momentum of the final mass?
October 9, 2012

math
The length of a rectangular area is 3 feet less than twice its width. The perimeter of the rectangle is 132 feet. Find the length and width of the rectangular area
October 3, 2012

math
Faye is making 13 bows to sell at the annual craft fair. She has 36 feet of ribbon to make her bows. If each bow requires 2 1/4 feet of ribbon will not be used
September 27, 2012

public finance
Your annual income is $50,000. You want to take out a mortgage loan to buy a house. The rule on mortgage loan requires that your annual mortgage payment cannot exceed 30% of your annual income. If the current interest rate is 5% for a 30-year mortgage loan, what is the maximum...
September 26, 2012

public finance
If the current interest rate is 5% for a 30-year mortgage loan, what is the maximum amount one can borrow for a house?
September 26, 2012

College algebra
Find the maximum value of: y=-3x^2 -15x +1
September 26, 2012

math
Prime & composite numbers explain
September 26, 2012

Chemistry
Calculate the quantity of cold water assuming that 50mL of cold water weighs 50g.
September 20, 2012

Psyhology
Why is it important to consider non-verbal communication from a cultural perspective when performing a patient diagnosis?
September 9, 2012

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