Wednesday
September 17, 2014

Posts by Liz


Total # Posts: 1,155

chemistry
a student determines the molar mass of methanol by the method used in this experiment. she found that the equilibrium temperature of a mixture of ice and pure water was .4 degrees Celsius on her thermometer. when she added 10g of her sample to the mixture, the temperature, ...
May 22, 2012

Calculus
A container is in the shape of an inverted right circular cone has a radius of 2 in at the top and a height of 6 in. At the instant when the water in the conatiner is 5 in deep, the surface level is falling at the rate of -.4 in/s. Find the rate at which the water is being ...
May 17, 2012

Calculus
Find the third Derivative of f(x)=x(3x-7)^3 The answer is 3x-1134 but I attempted the problem multiple times and I keep ending up with 648x-1134. What am I doing wrong?
May 17, 2012

Algebra2 {ASAP}
Hi helper, I used permutation for the following question. How can i use combination to find the answer? Help me please! There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is ...
May 17, 2012

social studies 9
Wouldn't this be reading or Literature? I think that Dickens gave him his name because he looks a bit chubby and is short. More like a bumble bee with a fat stomach. It is just a good guess and that is how i visulized him whem i read Oliver Twist by Charles Dickens.
May 17, 2012

Algebra
thank you! u r awesome... I wasnt too sure.. again thank you!
May 16, 2012

Algebra
Use the formula d=rt to find the value of the missing variable d=42 feet, t=14 seconds then r= ft. second
May 16, 2012

MAT 116 (algebra)
Please help not understanding this question. If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times? Make up your own numbers in an example and then explain your answer as though you were talking to ...
May 15, 2012

8 th grade
Good job.
May 14, 2012

English
The styles are different. The “ Theme for English B” is a free style and the “Ballad of Birmingham' has rhythm. The rhythm he uses is ABCB, ABCB and so on. The themes for both the “Theme for English B” and “Ballad of Birmingham” are civil...
May 13, 2012

English
Well i understand that the style for “Theme for English B" is a free style. I don't know what style a “Ballad of Birmingham” uses. I know that it is something like ABCB but i don't know what the name is for it. I'm thinking that the theme for ...
May 13, 2012

English
How do the styles and themes of “Theme for English B” and “Ballad of Birmingham” compare? Answer this question in at least a paragraph and make sure to cite examples from the text. Answer:
May 13, 2012

chemistry
Given the consentration of either hrgrogen ion or hydroxide ion, use the product constant of water to calculate the consentration of the other ion at 298 K. A: [H+]=1.0x10^-4M B: [OH-]= 1.3x10^-11M
May 11, 2012

Chemistry
If a total of 13.5 mol of NaHCO3 and 4.5 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced? 3NaHCO3(aq) + C6H8O7(aq) > 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)
May 6, 2012

Calculus
The strength of a beam with rectangular corss-section is directly proportional to the product of the width and the square of the depth (thickness from the top to bottom of the beam). Find the shape of the strongest beam that can be cut from a cylindrical log of diameter d= 3 ft
May 5, 2012

Physics
Thank you!!
May 3, 2012

Physics
The total charge in an electrical circuit as a function of time is given by q=t/t^2+1 coulombs. Find the maximum charge q. Please provide your reasoning.
May 3, 2012

Algebra 1
3x + 4y = -2 and 2x - 3y = 10
May 2, 2012

chemistry
Calculate the pH of a 2.5x10-5 M lithium hydroxide solution.
May 2, 2012

Chemistry-Help
An AM radio station broadcasts at 1060 kHz. Calculate the wavelength of the corresponding radio waves. How do I calculate this?
April 30, 2012

Algebra
3. There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10 selections. Show your work. Help! I'm ...
April 27, 2012

chemistry
1.16 x 10^22 sulfur atoms
April 24, 2012

chemistry
73.7g
April 24, 2012

chemistry
how many sulfur atoms are in 2.57 g of iron (III) sulfate?
April 24, 2012

chemistry
how many grams of magnesium carbonate are in a sample that has 1.58 x 10^24 oxygen atoms?
April 24, 2012

AP Chemistry
What is the pH of a .20M HA solution (Ka=1.0x10^-6) that contains a 0.40M NaA?
April 23, 2012

chemistry
What would the pressure be if h3 po4 was vaporized in a 20L container at a temperature of 23.5 degrees Celsius?? ( gas law)
April 22, 2012

Math
oops I meant length of AB
April 17, 2012

Math
An electric circuit has equally spaced parallel wire with connections A, B, and C. If the length of AP = 3.42 cm, what is the length of BC?
April 17, 2012

Calculus
Please help!! I keep solving this problem but I keep getting the wrong answer. Find the derivative of the function: f(x)= xsqrt(x-1)/(x+2)
April 17, 2012

Calculus
A electric circuit board has equally spaced parallel wires with connections at points A, B, C. If the length of AB=3.42 cm, what is the length of BC?
April 16, 2012

Native American Studies
OR d) All of the answers are correct
April 16, 2012

Native American Studies
a) Using a sacred site to store toxic waste b) Barring development on a sacred site c) Passing federal legislation to return sacred sites to Native American control All of the answers are correct
April 16, 2012

Native American Studies
Which of the practices listed is an example of an activity Native American people might regard as an act of desecration?
April 16, 2012

Calculus
Please help!! Differentiate: y=(x^2-1)^(1/2)/x^2
April 15, 2012

Calculus
Please Help! I tried doing this on my own and got the wrong answer. Differentiate: y=4/(x-x^2)^(1/4)
April 15, 2012

math
if 11% of the population is left handed, what is the porbability that as least one of the first 20 strangers you meet is left handed
April 5, 2012

math (integers)
What interval would you use on a line graph that's range is +13~+42?
April 2, 2012

physics
A baseball is tossed at a steep angle into the air and makes a smooth parabolic path. Its time in the air is t and it reaches a maximum height h. Assume that air resistance is negligible. a.) Show that the height reached by the ball is gt2 (square) /8. b.) If the ball is in ...
March 30, 2012

physics
A rock thrown horizontally from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. A.) Show that Therapy vertical distance of the bridge above water is 1/2gr2. B.) What is the height ...
March 29, 2012

chemistry
Write the correct equation for the formation of a white precipitate on mixing together 10 mL each of 1 M calcium chloride, 1 M calcium bromide, 1 M calcium nitrate, 1 M sodium carbonate, 1 M potassium carbonate, and 1 M rubidium carbonate.
March 27, 2012

Chemistry
What is the number of bonding electrons and the number of nonbonding electrons in the structure of BeF2?
March 14, 2012

Chemistry
during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you finish heating sample & ...
March 7, 2012

Chemistry
1. As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution and compare these...
March 5, 2012

Chemistry
In our lab we had to experiment with an apparatus in order to find such things as the percent of KClO_3 in the solution.. Assume that you heated your sample too rapidly and some of the sample spattered onto the rubber stopper of the test tube. Will your calculated percent ...
March 3, 2012

math
so its 3456?
March 2, 2012

math
what is the volume of the stereo speaker 24inchs 12inches 12inches
March 2, 2012

geometry
Alec used 8 cubes to make this square frame that has 3 cubes on each side. If he uses 16 cubes to make a square frame, how many cubes will be on each side of the frame
March 2, 2012

Science
If a man has a mass of 90 kg on earth, what is his mass on the moon?
March 1, 2012

Algebra II
Simplify - 2/(the 6th root of 81)
March 1, 2012

algebra
Simplify - 2 / (the 6th root of 81)
March 1, 2012

Math-Are my answers correct?
Thank you very much:)
February 28, 2012

Math-Are my answers correct?
An anagram is a rearrangement of all the letters in a word. Example: page--->gape, pgea.. a) Find the number of 7 letter anagrams possible for the letters in GUITARS. I did 7!=5040...is that correct? b) Find the probability of randomly choosing an anagram that starts with T...
February 28, 2012

Math for the middle school and elementary teacher
Thank you very much for you help:)
February 28, 2012

Math for the middle school and elementary teacher
3 red balls, 4 green balls, and 5 yellow balls are in a bag. If 2 balls are drawn randomly (without replacement) find the probability that the balls are different colors. I got 47/66 that the balls are different colors...is that right?
February 28, 2012

math for the middle school and elementary teacher
Thank you! :)
February 28, 2012

math for the middle school and elementary teacher
No, so that a) is the correct answer because order matters in the line! I am correct, right? Thank you very much:)
February 28, 2012

math for the middle school and elementary teacher
They are not different but for a) the order doesn't matter for the way that the people can be lined up. But for b) order wouldn't matter either because there it doesn't matter who is on which team. Then c) there are no specifed posistions for the committee I'm ...
February 28, 2012

math for the middle school and elementary teacher
I think that the answer is d) the number of different fruit salads made by choosing four out of seven fruits because you can't have all of the same fruit in a fruit salad.
February 28, 2012

math for the middle school and elementary teacher
Which one of the following situations a permutation? a) the number of ways 10 people can be lined up in a line for basketball tickets. b) The number of possible four member bowling teams from a family of six siblings. c) The number of ways to choose a committee of three from ...
February 28, 2012

Math for the middle school and elementary teacher
The answer is 79, correct? Thank you for your guidance and help:)
February 28, 2012

Math for the middle school and elementary teacher
I don't think you can find the total score because you would need the individual scores, right? I tried dividing 82/25 but that wouldn't work because we don't have all the scores...am I on the right track if not, can i please have some guidance? thank you!
February 28, 2012

Math for the middle school and elementary teacher
A prof. teaches 2 calc. classes. The first class has 25 students and their mean on the 1st test was an 82. The 2nd class has 15 students and their mean on the same test was a 74. What is the mean on this test if the prof. combines the score for both classes? Is the answer the ...
February 28, 2012

Precalculus
The answer I got is 152.87 degrees/second.
February 22, 2012

Precalculus
A wheel rolling at a constant speed has a radius of 15 inches and takes 30 seconds to roll 100 feet along the ground. What is its angular velocity? Use 3.14 for pie, and solve to two decimal places.
February 22, 2012

match
A certain land area is 340,000 square miles, and it holds a population of 63.1 million people.Calculate the population density.
February 16, 2012

Chemistry
What is the molar mass of hydrogen gas, H2?
January 29, 2012

Business Math
okay, I figure how to solve my problem. Principal: $21,900 Interest Rate: 12% Date borrowed: March 18 = 77 days Date repaid: January 9 = 9 days 365 - 77 = 288 + 9 = 297 days Interest = Prinicpal x Rate x Time I = $21,900 x .12 x 297/360 I = $2,168.10 Maturity Value = Principal...
January 29, 2012

Business Math
Joyce took out a loan for $21,900 at 12 percent on March 18, 2000, which will be due on January 9, 2001. using ordinary interest, Joyce will pay back on January 9 a total amount of: Answer: $24,068.10 Ordinary interest is 360 March 18 = 77 days January 9 - 9 days Interest = (P...
January 29, 2012

Business Math
Janet Jones borrowed $3,000 on 90-day 12 percent note. Janet paid $250 toward the note on day 35. On day 80 she paid an additional $400. Using the U.S. Rule her adjusted balance after her first payments is: Answer: $2,785 Please do step by step. Thank you.
January 29, 2012

Math
How do I factor this: x^6-124x^3-125
January 27, 2012

physics
a 2.0kg object is pulled horizontally by a force of 6.3N along the floor where the coefficient of kinetic friction is o.24. what is the object acceleration
January 26, 2012

Math
A local Dunkin donuts makes blueberry muffins that cost $.69 each to make. Past experience shows that 15% of the muffins will spoil and have to be discarded. Assuming this donut shop wants a 30% markup based on cost and produces 200 muffins, each muffin should sell for: Answer...
January 19, 2012

Math
A wooden duck with a regular selling price of $125.99 is marked down to $79.99. The percent of markdown is: Answer: 36.51% What is the formula? How to solve this?
January 19, 2012

Math
Vic's Department Store bought a pewter serving set for $1,250. Vic wants to markup the set at 60% of the selling price. The selling price of the pewter serving set should be: Answer: $3,125 How to to solve this? Confused?
January 19, 2012

Math
The answer is $6,000. However, I do not not how to get this answer. S = C + M formula? This problem is a multiple choice problem for my HW. It only gave these option A. $1,500 B. $6,000 C. $4,500 D. $9,000 When I submit the problem online, the correct answer show $6,000. How ...
January 19, 2012

Math
Bill furrier marks up mink coats 3000.00, which represents a 50% markup on cost. what is the cost of the coats?
January 19, 2012

physics
in a 100m race, 2 sprinters finish at the same time of 10.2 seconds, accelerating uniformly, sprinter A took 2 seconds to obtain max speed, sprinter B took 3 seconds, they ran their max speed for the remainder of the race, what is the acceleration of each sprinter?
January 17, 2012

case management
what are some similarities and differnces of case management in the community setting and in the managed care environment. As i see it, Case management has become a critical element in a community focused mental health system. Case management in the community is based on ...
January 8, 2012

Trigonometry
Steve and Peggy want to rent a 40 ft x 20 ft tent for their backyard to host a barbecue. The base of the tent is supported 7 ft above the ground by poles and the roped stakes are used for support. The ropes make a 60 degree angle with the ground. What are the dimensions of the...
January 8, 2012

chemistry
What is the difference in mass between a nickel that weighs 4.8 and a nickel that weighs 4.868 ?
January 8, 2012

Chemistry
Thanks for catching that. Corrected version of the problem below: While in Europe, if you drive 105 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 25.0 mi/gal? Assume that 1 euro = 1.26 dollars...
January 5, 2012

Chemistry
While in Europe, if you drive 105 per day, how much money would you spend on gas in one week if gas costs 1.10 per liter and your car's gas mileage is 25.0? Assume that 1 euro = 1.26 dollars. Express your answer numerically in dollars.
January 5, 2012

physics
If the mass is 4.3 kg, the initial speed is 4.0 m/s, and the initial height is 8.4 m, find the speed of the ball when it is at a height of 8.0 m. Please and Thank You for the help.
December 28, 2011

social studies
Where can I find facts about: *Johnson Space Center aka NASA [Houston] *Grand Canyon *Statue of Liberty
December 14, 2011

8th grade math
if a person is 6 feet tall and casts a 9 foot shadow, how tall would the shadow of a 100 foot tall tree be?
December 4, 2011

Math
Show all work If $7,500 is invested in a savings account earning 5% interest compunded quarterly, how many years will pass until there is $20,000?
December 1, 2011

math
Danielle has 4 hundreds,3 tens, and 6 ones blocks. Identify the greatest and the least possible 3-digit numbers she could subtract from that number. Then give the greatestand least possible 2-digit numbers she could subtract.
November 30, 2011

chem
If 2.8 of gas has a volume of 0.35 and a pressure of 5.4 , what is its Kelvin temperature?
November 27, 2011

economics
Canada and the US both produce wheat and computer software. Canada is said to have the comparative advantage in producing wheat if
November 27, 2011

middle school math
If the numerator and the denominator of a proper fraction are increased by the same amount, is the new fraction greater than, equal to, or less than the original fraction? Is this correct... it would be equal to because you are increasing both the numerator and the denominator...
November 9, 2011

science
In the lab you need to make 1.00 L of a 0.300 M NaCl solution. You had previously made a 0.950 M NaCl solution that you can dilute to form your new solution. How many mL of the concentrated solution would you use to make the dilute solution?
November 2, 2011

Health Administration
How to write effective Case Study
October 31, 2011

Algebra
Thank you so much. This kind of what I thought but was not to sure.
October 31, 2011

Algebra
A student is taking a literature course in which four tests are given. To get a B, he must average at least 80 on the four tests. The student got scores of 82, 76, and 78 on the first three tests. Determine (in terms of inequality) what scores on the last test will allow him ...
October 31, 2011

Math
Suddenly losing his thirst, Mathman decides to check out the festivities, but just then, Frankenstein ran by him screaming, "Cheater, cheater, apple eater." It seems that Dracula had illegally been using his bicuspids to win at apple-bobbing. Frankenstein was furious...
October 27, 2011

Math
Show all work You have 92 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side alongthe river, find the length and width of the plot that will maximize the area.
October 25, 2011

Algebra Please help!!!!
Thank you!! That's what I thougth but I was thrown off by the square root.
October 20, 2011

Algebra Please help!!!!
That's what I was thinking as well but the 75 being squared is throwing me off. Do I need to write it as 5(3x+2)=75²?
October 20, 2011

Algebra Please help!!!!
I need assisatnce with this. I do not want the answer I just want some guidence on how I should start it. The width of a rectangle is 5 ft, its length is (3x+2) ft, and its area is 75 ft². Find x
October 20, 2011

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