Wednesday
October 22, 2014

Posts by margaret


Total # Posts: 147

Math
you need to clean the gutters of your home. the gutters are 24 FT above the ground. for safety, the distance a ladder reaches up a wall should be four times the distance from the bottom of the ladder to the base of the side of the house. Therefore the ladder must be 6 ft from ...
February 19, 2014

Accounting. Present Value.
Suppose you want to have $5,000 saved at the end of five years. The bank will pay you 2% interest on your money. How much would you have to deposit today to have the $5,000 you want at the end of five years.
February 4, 2014

Chemistry
How many moles of Aluminium Bromide is fromed from 4.0 moles of Aluminium in equation: 2Al + 3 Br2 = 2 AlBr3?
November 5, 2013

math
The Fourier series expansion for the periodic function,f(t) = |sin t|is defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal places. Anybody ...
October 14, 2013

math
The Fourier series expansion for the periodic function,f(t) = |sin t|is defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal places. Anybody ...
October 14, 2013

Physics
A 2.5 kg block sits on an inclined plane with a 30 degree inclination. A light cord attached to the block passes up over a light frictionless pulley at the top of the plane and is tied to a second 2.5 kg mass freely hanging vertically. The coefficients of static and kinetic ...
October 11, 2013

Chemistry
10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?
October 8, 2013

Chemistry
10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?
October 8, 2013

Chemistry
10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?
October 8, 2013

world geography
I would like you to answer it for me
October 1, 2013

Mathmatics
any kind soul please help me. thanks.
September 29, 2013

Mathmatics
A function of two variables is given by, f(x,y) = e^2x-3y Find the tangent approximation to f(0.989,1.166) near (0,0), giving your answer to 4 decimal places. Any kind soul to help on the problem. My professor raise this problem to me. i am so stuck.
September 29, 2013

English Composition 1
I need to change the syle of writing from a chapter in a book. From whatever syle it is written in to one of, gothic romance, pulp fiction or horror story. I don't know how to write in any of those styles, I don't know how to write!
July 22, 2013

Pre-Calculus
Using the given zero, find one other zero of f(x). Explain the process you used to find your solution. 1 - 6i is a zero of f(x) = x4 - 2x3 + 38x2 - 2x + 37.
June 9, 2013

Finance
Calculate the return and standard deviation for the following stock, in an economy with five possible states. If a Boom (Probability=25%) economy occurs, then the expected return is 30%. If a Good (Probability=25%) economy occurs, then the expected return is 15%. If a Normal (...
June 4, 2013

Chemistry
Consider the titration of 100.0 mL of 0.260 M propanoic acid (Ka = 1.310−5) with 0.130 M KOH. Calculate the pH of the resulting solution after each of the following volumes of KOH has been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL (b) 50.0 mL (c) 100...
March 13, 2013

Chemistry
Consider the titration of 41.5 mL of 0.213 M HCl with 0.123 M KOH. Calculate the pH of the resulting solution after the following volumes of KOH have been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL (b) 10.0 mL (c) 40.0 mL (d) 80.0 mL (e) 100.0 mL
March 13, 2013

Chemistry
Calculate the pH of a solution formed by mixing 124.8 mL of 0.481 M KF and 130.7 mL of 0.084 M HClO3.
March 13, 2013

Chemistry
What volumes of 0.47 M HF and 0.47 M NaF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.50? HF NaF
March 13, 2013

Chemistry
Calculate the pH after 0.013 mole of gaseous HCl is added to 272.0 mL of each of the following buffered solutions. (Assume that all solutions are at 25°C.) (a) 0.080 M C5H5N and 0.19 M C5H5NHCl (b) 0.72 M C5H5N and 1.52 M C5H5NHCl
March 13, 2013

Chemistry
You make 1.00 L of a buffered solution (pH = 5.10) by mixing propanoic acid and potassium propanoate. You have 1.00 M solutions of each component of the buffered solution. What volume of each solution do you mix to make such a buffered solution? propanoic acid potassium ...
March 13, 2013

Chemistry
How many moles of NaOH must be added to 1.0 L of 2.2 M HF to produce a solution buffered at each pH? (a) pH = pKa (b) pH = 4.24 (c) pH = 4.60
March 13, 2013

Chemistry
Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.) (a) pH = 4.70 (b) pH = 5.26 (c) pH = 5.42 (d) pH = 4.96
March 13, 2013

Chemistry
A buffered solution is made by adding 48.6 g C2H5NH3Cl to 1.00 L of a 0.77 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)
March 13, 2013

Chemistry
Calculate the pH after 0.016 mole of NaOH is added to 1.05 L of a solution consisting of 0.138 M HONH2 and 0.127 M HONH3Cl, and calculate the pH after 0.016 mole of HCl is added to 1.05 L of the same solution of HONH2 and HONH3Cl. (Assume that all solutions are at 25°C.) 0...
March 13, 2013

Chemistry
Calculate the pH after 0.14 mole of NaOH is added to 1.07 L of a solution that is 0.54 M HF and 1.15 M NaF, and calculate the pH after 0.28 mole of HCl is added to 1.07 L of the same solution of HF and NaF. 0.14 mole of NaOH 0.28 mole of HCl
March 13, 2013

Chemistry
Calculate the pH of a solution that is 0.124 M C2H5NH2 and 0.124 M C2H5NH3Cl. (Assume that the solution is at 25°C.)
March 13, 2013

Chemistry
Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).
February 28, 2013

Chemistry
Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).
February 27, 2013

Chemistry
Would you expect the pressure of a 12.5 mL syringe of natural gas to be the same as the pressure of 12.5 mL of air? In other words, is Boyle's Law dependent on the type of gas that is being measured?
February 26, 2013

Chemistry
I'm sorry but I am still confused.
February 19, 2013

Chemistry
Given the following functions, answer the questions: Temperature (°C) Kw 0 1.1410−15 25 1.0010−14 35 2.0910−14 40. 2.9210−14 50. 5.4710−14 Is the autoionization of water exothermic or endothermic? (b) What is the pH of pure water at 35°C...
February 19, 2013

Chemistry
Determine if the solubility would increase, decrease, or stay the same: 1) A saturated solution of sugar water is cooled from room temp to 0 degrees Celsius. 2) A solution of ocean water with dissolved oxygen is heated from 10 degrees Celsius to 15 degrees Celsius. 3) A ...
February 19, 2013

Chemistry
What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. What is the % V/V concentration for the solution? Please show work.
February 19, 2013

Chemistry
How many grams of magnesium sulfate would you need to make 0.500 L of a 10.0% M/V solution in water? Please show work.
February 18, 2013

Chemistry
If you want to make 75 mL of a 0.015 M solution of B(OH)3 in water, how many grams of B(OH)3 would you need?
February 18, 2013

Chemistry
NO(g) + NO2(g) N2O3(g) N2O4(g) 2 NO2(g) Sorry about that
February 13, 2013

Chemistry
Given the following equilibrium constants are given at 377°C, 1/2 N2(g) + 1/2 O2(g) NO(g) K1 = 110−17 1/2 N2(g) + O2(g) NO2(g) K2 = 110−11 N2(g) + 3/2 O2(g) N2O3(g) K3 = 210−33 N2(g) + 2 O2(g) N2O4(g) K4 = 410−17 determine the values for the ...
February 13, 2013

Chemistry
it says my answer is still wrong. I got 0.017683 but it says the right answer is 0.071777081878092.
February 13, 2013

Chemistry
At a particular temperature, 13.7 mol of SO3 is placed into a 3.9-L rigid container, and the SO3 dissociates by the reaction given below. 2 SO3(g) 2 SO2(g) + O2(g) At equilibrium, 3.8 mol of SO2 is present. Calculate K for this reaction.
February 13, 2013

Science
At 25°C, Kp = 2.910−3 for the following reaction. NH4OCONH2(s) 2 NH3(g) + CO2(g) In an experiment carried out at 25°C, a certain amount of NH4OCONH2 is placed in an evacuated rigid container and allowed to come to equilibrium. Calculate the total pressure in the ...
February 13, 2013

Chemistry
A sample of gaseous PCl5 was introduced into an evacuated flask so that the pressure of pure PCl5 would be 0.54 atm at 425 K. However, PCl5 decomposes to gaseous PCl3 and Cl2, and the actual pressure in the flask was found to be 0.85 atm. Calculate Kp for the decomposition ...
February 13, 2013

Chemistry
Determine the theoretical field of aspirin for a student who started the experiment with 2.489 g of salicylic acid. Show your work.
February 12, 2013

Science
Two students measured the outside temperature at noon from a thermometer hung in the playground. The two students recorded very different measurements. Give two possible reasons for why the students got such different measurements. I know one reason is one student is reading C...
January 7, 2013

Math
X^3+9x^2-108¡Ý0
December 29, 2012

ENGLISH
7. contend 8. poignant thank you so much i am ready for a break from school...
December 6, 2012

ENGLISH
4. conversely 7. poignant 8. contend 9. charisma
December 6, 2012

ENGLISH
ty i was headed down the right path now... i just got and typed 1 and 2 backwards.
December 6, 2012

ENGLISH
1. contempory 2. prevalent 4. contend I did look them up 1. charisma - personal appeal 2. contemporary – current 3. contend – to declare 4. conversely – in contrast 5. extrovert – a sociable person 6. poignant – affecting the emotions 7. prevalent &#...
December 6, 2012

ENGLISH
Many people are surprised to learn how __1__ poverty is __2__ America. Today millions live below the poverty line, and the number seems to escalate daily. Judy and Martin Reed exemplify the old saying, “Opposites attract.” A __3__ Judy chooses work that brings her ...
December 6, 2012

physics
2) Tube (b) is also filled with water, A1 is 0.05m2 and A2 is 0.08m2 Two pistons are placed in both ends of the tube and forces, F1 and F2 are exerted on the pistons so that they remain at the same height. If F1 = 20N what is F2? (I got the answer to this question) 3) Tube (c...
November 7, 2012

Statics
The right angle uniform slender bar AOB has mass m. Assuming a frely hinged pivot O, determine the magnitude of the normal force at A and the magnitude of the pin reaction at O.
October 16, 2012

Health
What causes depression? A. Genetic issues B. Biochemical issues C. There is no known cause D. Environmental issues Reset Selection
October 10, 2012

Science
In black and white photography, a photon energy of about 4.00 x 10 to the negative 19th power I is needed to bring about the changes in the silver compounds used in the film. Explain why a red light used in a darkroom does not affect the film during developing.
October 8, 2012

Science
How many minutes are required for a radio signal to travel from Earth to a space station on Mars if Mare is 7.83 x 10 to the 7th power km?
October 8, 2012

math
Jessie time 7 minute Michael’s time is 2.5 times slower Divide 7 minutes by 2.5 to get answer Jesse = 7 Michael = 2.5 X 7 = 2.5 X 7/2.5 X = 17.5 to check answer divide 17.5 by the 2.5, your answer is 7.
October 8, 2012

Science
How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is 3.85 x 10 to the 5th exponent?
October 8, 2012

Economics
How does the market price of a good in a monopoly market compare with the market price of the same good in a perfectly competitive market? A. The price is higher. B. The price is lower. C. The prices cannot be compared. D. The prices are the same.
September 12, 2012

Economics
To improve its standard of living, a nation’s economy must A. remain stable. B. grow through innovation. C. reach economic equity. D. allow the central government to make economic decisions. Reset Selection
September 5, 2012

math
Solve the problem using inductive reasoning. Find the 12th square number that corresponds to the following dot sequence. A. s12 = 144 B. s12 = 24 C. s12 = 169 D. s12 = 78 Reset Selection
August 13, 2012

Penn
I need to write a paragraph why i choose medical billing. It has to have different experiences that motivate you to choose that field
July 30, 2012

Economics
Suppose the market for the magazine is in equilibrium. Some students insist on raising the cover price by $1 and printing the same quantity. What is likely to happen? A. The demand for the magazine will go up. B. There will be a shortage of 150 magazines. C. There will be a ...
April 30, 2012

Economics
Advances in technology have reduced the cost of manufacturing MP3 players. If demand does not change, A. more MP3 players will be sold at a higher price. B. fewer MP3 players will be sold at a higher price. C. more MP3 players will be sold at a lower price. D. fewer MP3 ...
April 30, 2012

Economics
A major characteristic of monopolistic competition is that prices will be A. higher than in perfect competition. B. lower than in perfect competition. C. higher than in a true monopoly. D. unrelated to the type of competition.
April 30, 2012

writing
what is the behaviors associated with editing
April 22, 2012

English 12
In “Porphyria’s Lover” how does the speaker feel when Porphyria says she loves him? A. angry B. sad C. surprised and angry D. surprised and happy
April 17, 2012

Microeconomics
What is the definiton of marginal proficiency consumer?
April 11, 2012

cells - science
Ohh haha thanks anyways
January 12, 2012

physics
A red bead releasd from rest at height H slides down a wire without sticking to a green bead initally at rest. The mass of the green bead is half that of the stuck together beads both continue to slide down the wire and then slide back up. With the starting height of the green...
December 6, 2011

chemistry lab
Explain how the differences in the solubility products of AgI and AgCl make this experiment possible. Include in your discussion a narrative of what is happening to the electrode potentials and the I-, Cl-, and Ag+ ions.
December 2, 2011

Math Help Please
that should read A intersection B and union C
November 13, 2011

Math Help Please
Let U = {9, 10, 11, 12, 13, 14, 15, 16, 17, 18}, A = {10, 12, 14, 16}, B = {13, 17}, and C = {10, 13, 16, 17, 18}. List all the members of each of the sets. (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the last boxes.) A ...
November 13, 2011

tenth grade science
What can you conclude about the effect of the thermal expansion of water on sea level?
October 24, 2011

CHEMISTRY
I did what you said but I keep getting the wrong answer no matter what I do.
October 10, 2011

G-Chem
How man grams of Fe+3 are required to make 1.0L of an aqueous solution of 10 ppm Fe+3: (Assume the densit of water is 1.00g/mL)
October 5, 2011

engineering physics
An object of mass m is dropped at t=0 from the roof of a building of hdight h. A wind blowing parallel to the face of the building exerts a constant force F on the object. At what time t does the object strike the ground? Express t in terms of g and h.
September 25, 2011

Physics
A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? b. To sell her plan to the ...
September 19, 2011

physics
A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? To sell her plan to the ...
September 19, 2011

physics
A ball is thrown upward. After reaching a maximum height, it continues falling back to- ward Earth. On the way down, the ball is caught at the same height at which it was thrown upward.If the time (up and down) the ball remains in the air is 2.3 s, find its speed when it ...
September 15, 2011

physics
A stone is thrown straight up from the ground with an initial speed of 30.5 m/s . At the same instant, a stone is dropped from a height of h meters above ground level. The two stones strike the ground simultaneously.Find the height h. gravity is 9.8 m/s2 . Answer in units of m...
September 15, 2011

algebra
. Solve using the multiplication principle. 5¡Á¡Ý-4
May 20, 2011

Physics 112
Two stationary point charges of 5.00 and 2.00 are separated by a distance of 60.0 . An electron is released from rest at a point midway between the charges and moves along the line connecting them. What is the electric potential energy of the electron when it is at the ...
February 11, 2011

Physics 112
Three point charges with values = 4.00 , = 1.00 , and = 7.00 are placed on three consecutive corners of a square whose side measures = 5.00 . Point A lies at the fourth corner of the square, diagonally across from . Point B lies at the center of the square. What are the values...
February 11, 2011

Algebra
s>2+7s+10
February 1, 2011

math
still stuck on simplififying 3x^3+5x^5...please assist
December 31, 2010

math
is x to the 4th power plus x to the 4th power equal to x to the 8th power?
December 31, 2010

Math
how is the following simplified 3x to the third power plus 5x to the fifth power
December 31, 2010

Math
how is the following simplified 3x to the third power plus 5x to the fifth power
December 31, 2010

math
3x to the 3rd power plus 5x to the fifth power
December 31, 2010

Government
A bill has been approved in the House and Senate, albeit in slightly different versions. The bill now goes to ??
December 13, 2010

Physics
A 21.0-kg box rests on a frictionless ramp with a 15.1° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 43.6° with the horizontal, what is the smallest force F the mover will have to exert to move the box up...
October 9, 2010

Chemistry
4NH3+5O2 = 4NO + 6 H20 If a container were to have 10 molecules of O2 and 10 molecules of NH3, initially, how many total molecules (reactants plus products) would be present in the container after this reaction goes to completion?
September 17, 2010

statistics
using the 68- 95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard diviation of 20. Use the 68-95-99.7 rult to find the following quantities: percentage of scores less than 100 relative frequency of scores less than 120. ...
August 19, 2010

Marketing Foundation
Select a purchase for a refrigerator which recently made and please describe your buying process, including any other parties involved in the buying process and their roles
June 3, 2010

Marketing Foundation
Select a purchase you personally have made recently and describe your buying process, including any other parties involved in the buying process and their roles in your purchase decision. To do this, please complete the following template and make sure to mentioned what your ...
June 2, 2010

Math 7th grade
Susan has red, blue, and yellow sweaters. Joanne has green, red, and white sweaters. Diane's sweaters are red, blue, and mauve. Each girl has only one sweater of each color and will pick a sweater to wear at random. Find the probability that each girl chooses a different ...
May 23, 2010

7th grade
Susan has red, blue, and yellow sweaters. Joanne has green, red, and white sweaters. Diane's sweaters are red, blue, and mauve. Each girl has only one sweater of each color and will pick a sweater to wear at random. Find the probability that each girl chooses a different ...
May 23, 2010

College Algebra
car traveling on a road perpendicular to railroad track, car is 30 meters from the crossing, train is 50 meters from the car; how far is the train from the crossing?
May 8, 2010

confidentiality of health information
The answer is c.
April 28, 2010

math
5x-y=36 5x+6y=-6 5x-y=36 -1(5x+6y=-6) Distribute 5x-y=36 -5x-6y=6 add these two equations right on top of each other. 0x-7y=42 -7y=42 y=-6 plug in the -6 for y, into either equation, and solve for x. 5x-(-6)=36 5x+6=36 5x=30 x=6 in ordered pairs, the answer is (6,-6)
March 21, 2010

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