Tuesday
October 21, 2014

Posts by cynthia


Total # Posts: 516

Chemistry
Calculate the volume (in mL) of 9.0M H2SO4 that you would need to convert 0.070 moles of KAl(OH)4 to K2SO4 and Al2(SO4)3 according to the following equation: 2 KAl(OH)4 + 4 H2SO4->K2SO4 + Al2(SO4)3 + 8 H2O
February 29, 2012

Chemistry
Calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation = 2 Al (s) + 2 KOH (aq) + 6 H2O (l) ¨ 2 KAl(OH)4 (aq) + 3 H2 (g)
February 29, 2012

Calculus AP need help!
oops.. i thought 1/2 to -3/2. now i understand. thanks
February 28, 2012

Calculus AP need help!
1. f(x)=√5x+6, find f'(x) 2. f(x)=√4x^2+3x+4, find f'(x). i got stuck. f(x)=√5x+6=(5x+6)^1/2 f'(x)= 1/2(5x+6)^-3/2*(5).
February 28, 2012

algebra. help!!
my answer is 63.56. i dont know if its right answer. here this problem: It takes Scott an average of 45 min to prune 1 tree. Victor takes 65 min to prune a tree on average. The Scott-Victor Pruning Service has the contract to prune 92 trees in Flagstaff, AZ. How long ...
February 26, 2012

COLLEGE CALCULUS. HELP!
Find the derivative of the function. 1. F(x)= (1+2x+x^3)^1/4 2. f(t)= (1+tant)^1/3
February 26, 2012

COLLEGE CALCULUS. HELP!
i got it thanks
February 25, 2012

COLLEGE CALCULUS. HELP!
hey how u get 324x?
February 25, 2012

COLLEGE CALCULUS. HELP!
i got stuck
February 25, 2012

COLLEGE CALCULUS. HELP!
Let f(x)=(-3x^2+6)^4(9x^2+7)^14, Find f'(x). f'(x)= (-3^2+6)^4 d/dx(9x^2+7)^14+(9x^2+7) d/dx(-3x^2+6)^4 =(-3x^2+6)x14(9x^2+7)^13 d/dx(9x^2+7)+(9x^2+7)^14x4(-3x^2+6)^3 d/dx(-3x^2+6) =14(-3x+6)^4(9x^+7)^13 (18x)+ 4(9x^2+7)(-3x^2+6)^3 (-6x)
February 25, 2012

Chemistry
The concentration of Pb+2 in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluable lead(II)carbonate (267.2092 g/mol) according to the balanced equation ...
February 22, 2012

Chemistry
In basic solution, H2O2 oxidizes Cr+3 to Cro4^-2 and is reduced to OH-. What is the balanced equation?
February 22, 2012

Chemistry
What mass of oxalic acid dihydrate , H2C2O4•2H2O, is required to prepare 220.0 ml of a 1.28 M solution of oxalic acid ?
February 22, 2012

Chemistry
A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the best procedure for preparing this solution ?
February 22, 2012

Chemistry
A 30.00-mL sample of weak acid is titrated with 0.0167 M NaOH. At the endpoint , it is found the 40.35 mL of titrant was used. What was the concentration of the weak acid ?
February 22, 2012

Chemistry
A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the besst procedure for preparing this solution ?
February 22, 2012

Chemistry
How many grames of lithium nitrate LiNO3 (68.9 g/mol) are required to prepare 174.1 mL of a 0.698 MLiNO3 solution ?
February 22, 2012

Chemistry
What is the net ionic equation for the reaction that occures between nitrouse acid and strontium hydroxide ?
February 22, 2012

Chemistry
What is the net ionic equation for the reaction that occures between nitrouse acid and strontiun hydroxide ?
February 22, 2012

Project Management
What elements do you think are critical when conducting project meetings and why do you think they are important? How do project meetings help with managing inter-organizational relations? Be sure to address the concept of group think in your discussion.
February 22, 2012

Business
Select an organization with which you are familiar and discuss the impact of that organization’s level of social responsibility on a stakeholder group of your choice
January 29, 2012

Business
Select an organization with which you are familiar and discuss the impact of that organization’s level of social responsibility on a stakeholder group of your choice
January 24, 2012

Chemistry
A lightyear is a unit of length equal to the distance that light travels in 1 year. What is 1 lightyear expressed in units of meters? The speed of light is 3.00 × 100^8 m/s.
January 22, 2012

Chemistry
Could you explain how or why ?
January 18, 2012

Chemistry
The enthalpy of combustion of benzoic acid is –26.4 kJ/g. What is the enthalpy of combustion expressed in joules per kilogram?
January 18, 2012

chemistry
How many 400-mg aspirin tablets can be made from 40.0-kg of aspirin?
January 18, 2012

scientific notations
7.13x10^11 = 713,000,000,000 - To convert from scientific notation to standard from simply move the decimal point 11 spaces to the right after the 7 . 10's power will tell you how many spaces to move to decimal , if its positive to the right and if its negitave to the left...
January 18, 2012

Medical Coding
what are the 2 diagnosis codes
January 10, 2012

Statistics
are the following statements, Ho:=10 and Ha:equal to or less than, a valid pair of null and alternative hypothesis?assume that in a hypothesis test with null hypothesis Ho : u = 12.0 at a = 0.10, that a value of 16.0 for the sample mean results in the null hypothesis being ...
November 19, 2011

PHYSICS
On the planet jupiter , g is 2.5m/s². What does this mean?
November 5, 2011

Trig
Find the exact value of tan 5pi/12 using the half-angle identity.
October 15, 2011

Chemistry
A 0.250g smaple of magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29C at 752torr, the volume is found to be 297mL. The vapor pressure of water at 29C is 30.0torr. What is the mass percentage of ...
October 9, 2011

Chemistry
why is a water molecule is much more likely to give up a proton than a methane molecule
October 2, 2011

londontowne
divide the product of 8 and 1/2 by .02
September 3, 2011

History
Is History an art or a science?
September 3, 2011

chemistry
why is 1mol of so3 gas higher in entropy than so2 gas
August 22, 2011

Calculus
A team has been working to convert diesel-powered cars to run just as efficiently on used cooking oil! They want to compare the mileage and speed of their prototype with that of the diesel-powered car. The prototype is 100 meters south of an intersection, while the diesel car ...
August 1, 2011

Calculus
Part of a circuit has two resistors connected in parallel as shown in the figure. R(1) is a constant resistor of 10 ohm, while R(2) is a variable resistor with resistance that varies at a rate of 2 ohms per minute. The total, or effective, resistance, R, provided by this ...
July 29, 2011

calculus
Using L'Hôpital's rule, evaluate lim of xe^(-x) as x approaches infinity
July 29, 2011

calculus
Find the average value of the function f(x) = (2x - 5)^2 on the interval [1, 2].
July 29, 2011

Earth Science
In what ways can sea level be lowered? What effect might this have on existing life forms? I can't find it in my textbook. Can somebody helps??????? THANKS A LOT!!!!!
July 27, 2011

Earth Science
How is the local hydrologic cycle affected by the practice of drawing drinking water from a river and then returning sewage to the same river? Can anyone please help?????? THANKS A LOT!!!!!
July 20, 2011

Physics
A 6 µC charge is placed at the origin and a second charge is placed on the x-axis at x = 0.34 m. If the resulting force on the second charge is 4.0 N in the positive x-direction, what is the value of its charge?
July 14, 2011

Chemistry
Since the oxidation number of Chromium is +3, and the oxidation number of Silicon is -4. Why is the chemical formula for Chromium III Silicide Cr3Si2? Can somebody please explain to me please???????THANKS A LOT!!!
July 13, 2011

Chemistry
Oxygen has a boiling point of 90K, and nitrogen has boiling point of 77K. Which is a liquid and which is a gas at 80K? I tried to look into the phase diagrams, but I still don't understand. Can somebody please help and explain to me??? THANKS A LOT!!!
July 10, 2011

math
How did math originate?
July 6, 2011

math for elemetary school teachers
need to create a number system using only: A=1, B=2, C=3, D=4 and Zero=0. Help
June 4, 2011

finance
The company has an open invoice for $100 but then chooses to take the 2% discount offered and pay $98 if paid within 10 days.
May 26, 2011

finance
A corporation’s pretax net income of $1,000,000 is taxable based on 30% of the first $300,000, 35% of the next $300,000, and 40% of the balance:
May 26, 2011

movement and music
morning
May 20, 2011

finance
A company began the year with retained earnings of $1,000. Net income for the year was $250, it repaid $350 of its line of credit balance, and it paid dividends to its shareholders of $200. What was the company’s retained earnings at the end of the year?
May 20, 2011

finance
Hauser Sports had sales in 2010 of $750,000, cost of sales of $500,000, average accounts receivable of $100,000 and average inventory of $225,000. How many days, on average, does it take Hauser Sports to sell its inventory assuming that all sales are on credit?
May 20, 2011

finance
The Cookie Shoppe expects sales of $500,000 next year at a 5% pretax profit margin and an average tax rate of 35%. If it chooses to pay out 30% of its earnings as dividends, what is the projected increase in retained earnings
May 20, 2011

finance
Central Systems has a pretax cost of debt of 8%, an average tax rate of 30%, and a cost of equity of 14%. If the company’s debt-equity mix is 50%-50%, what is Central’s weighted average cost of capital?
May 20, 2011

finance
Chelsea Fashions is expected to pay an annual dividend next year of $1.00 per share. The market price of the stock is $25 and the growth rate of dividends is expected to be 5%. What is Chelsea’s cost of equity?
May 20, 2011

finance
What is the net present value of a project that has an upfront cash outlay of $30,000, and generates cash inflows of $15,000 in year 1, $20,000 in year 2, and $25,000 in year 3 assuming that the company’s cost of capital is 15% per year?
May 20, 2011

finance
How much should you be willing to pay for one share of stock if the company just paid a $1 dividend, you expect the dividends to increase by 5% annually, and you need a 12% return on your investment
May 20, 2011

geometry
Find the supplement to the angle whose measure is 85 degrees.
April 7, 2011

Frankenstein
How does shelly keep mystery and terror along with supernatural elements in chapters 8-10
March 30, 2011

geometry
donald's garden is rectangular the garden is 14 metres long it's perimeter is 47 metres how wide is the garden
March 23, 2011

math
you have $60, consisting of quarters and pennies. write an inequality that shows the different number of coins in piggy bank
March 20, 2011

trig
The number of a fraction is three more than twice the denominator. The fraction simplified is equal to 9/4 Find the fraction
March 16, 2011

Physics
find the height from which you would have to drop a ball so that it would have a speed of 9.0 m/s
March 3, 2011

French
I'm supposed to come up with something in the imparfait that begins with "Quand j'étais petite, ... but my vocabulary is very limited so I don't really know what to write. Any suggestions?
March 1, 2011

chemistry
what is the name of the compound made ofrom chlorine and magnesium
February 8, 2011

science
an astronaut in space vehicle traveling from earth to the moon is in potential danger of being harmed by the sun's ultraviolet radiation.
January 24, 2011

Structural Design, Part 2
The structural technique that includes long vertical studs running from the sill plate to the second floor roof frame is called Frame
January 20, 2011

calculus
An athlete is running around a circular track of radius 50 meters at the rate of 5 meters per second. A spectator is 200 meters from the center of the track. How fast is the distance between the two changing when the runner is approaching the spectator and the distance between...
January 11, 2011

world history
The key diplomatic achievement of Bismarck's foreign policy was
January 10, 2011

chemistry
I am very confused about hybridization in general. Please give an explanation on how to do this. Which of the following pairs of atomic orbitals of adjacent nuclei can overlap to form a sigma bond? a pi bond? or no bond at all? a) 1s and 1s b) 1s and 2px c) 2px and 2py d) 3py ...
January 8, 2011

chemistry
freezin point of the solution 25.5g c7h11no7s in 1 x 100gh2O (nonionizing solute)
January 6, 2011

math (combination)
Hmm...the book says it's 252, which corresponds to (2C1)(9C4) or 252.
December 30, 2010

math (combination)
A woman has 11 close Friend. Find the number of ways she can invite 5 of them to dinner if a. but where 2 of the friends are married and will not attend seperately b. where 2 of the friend will not attend together the answer to a. 210 b. 252 Please explain....
December 30, 2010

Math (combination/permutation)
Let A denote one of the students. There are C(11,3) = 165 ways to choose 3 other students to be on the same tam as A. Now let B a student who is not on the same as A. Then let B be a studnt who is not on teh same team as A. There are C(7,3) = 35 ways to choose 3 from the ...
December 30, 2010

Math (combination/permutation)
Question 1: There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students are to take each test. Question 2 Find the number of ways 12 students can be partitioned into 3 teams A, B, C, so that each team contain 4 students...
December 30, 2010

Math (combination/permutation)
Question 1: There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students are to take each test. Question 2 Find the number of ways 12 students can be partitioned into 3 teams A, B, C, so that each team contain 4 students...
December 30, 2010

SCI !!!!
I love the poem! You did a great job!
December 29, 2010

Chemistry
A quantity of 0.020 mole of a gas initially at 0.050 L and 20 degrees Celsius undergoes a constant-temperature expansion until its volume is 0.59 L. Calculate the work done (in joules) by the the gas if it expands (b) pressure of 0.20 atm. (C) If gas in (b) is allowed to ...
December 28, 2010

math
the distance of D in feet it takes a car traveling at x mph to come to a full stop after hitting the brakes is given by d= 1.26x^2+ .075x. Est. the stopping distance for a car traveling at 40 mph
December 17, 2010

ALGEBRA
that is what I got
December 13, 2010

ALGEBRA/please help
-4(-25-(6)) -4 (-25-6) -4 (-31) 124
December 13, 2010

math
The volume of a ball is 288 pi cm^3. Find the dimensions of a rectangular box that is just large enough to hold the ball. use 3.14 for pie
December 13, 2010

Chemistry
The melting point of aspirin : 128-137Celsius degree. The melting point of the crude aspirin was measured to be 128 Celsius degree. What does it indicate about the purity of the product?
December 5, 2010

Physics
m*(L+Delta L)*w^2=k*(Delta L) Delta L=(m*w^2)/(k-m*w^2) Mass: 156 g=.156kg Answer: 0.128
December 3, 2010

world history
how did the Aztec and the Inca built their empires/
December 1, 2010

calculus
thank you
November 23, 2010

calculus
6.A manufacturer of DVD players has been selling 800 each week at 150$each. From a market survey it is discovered that for each $5 reduction in price, they will sell an extra 40DVD players each week. a)What is the demand function? b)How large a reduction in price (rebate) ...
November 23, 2010

algebra 1
8x-(2x+7)=23I am completely drawing a blank as to how I am suppose to solve this. Can someone offer the first step?
November 16, 2010

algebra 1
8x-(2x+7)=23
November 16, 2010

Advanced accounting
The balance sheets of Petrello Company and Sanchez Company as of January 1, 2011, are presented below. On that date, after an extended period of negotiation, the two companies agreed to merge. To effect the merger, Petrello Company is to exchange its unissued common stock for ...
November 15, 2010

geometry
The circumference of a circle is approximately 28.26 cm. Find its diameter and radius
November 2, 2010

chemistry
0.5123 g KHP sample was dissolved in about 25 mL of distilled water, and titrated to the phenolphthalein endpoint with 28.75 mL of a sodium hydroxide solution. Calculate the molar concentration of the hydroxide solution
October 16, 2010

9th grade
the shower is the story in line 1-4 the speaker usesa metaphor to compare the twilight to
September 29, 2010

math word problems
15 yards gained
September 28, 2010

math geometry
what is the area of a regular hexagon having sides of 16 meter length?
September 28, 2010

math
-3/5 =(9/35)so how would i get to coming up with the answer
September 24, 2010

math
7/9-(13/18)does it equally -1/18 or can you help me with this soultion
September 24, 2010

math
-3/5 =(9/35)=0.34285714 as a decmial and a fraction of -12/35 did i work this problem right
September 24, 2010

math
4-(-3)+1/2-2/(-2) am having trouble with this problem. I got a 8.5 decimal are a fration of 8 1/2 am I right? are how do i come up with the solution
September 24, 2010

biology
When considering the incresing complexity of atoms, molecules, cells, and tissues, you may notice that each step characteristics that were absent in the previous level. These characteristics, called emergent properties, demonstrate that the whole organism is more than the sum ...
September 21, 2010

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | Next>>

Search
Members