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October 25, 2014

Posts by David


Total # Posts: 1,685

geometry
If p is an interger and 3 is the remainder when 2p+7 is divided by , then p could be what?
March 3, 2010

Math
A farmer has a dog, two geese and three bags of corn. He comes to a river. The boat to ferry him across the river can only hold the man plus two of his six possessions at a time. The farmer knows that if he is not right there the dog will eat a goose or a goose will eat the ...
March 2, 2010

math
(3n^4)^4 = 3d^3 x d^9 = 5e^4 x 6e^5 = thanks
February 28, 2010

Literature
In "A Pair of Silk Stockings," are a symbol of
February 27, 2010

11th grade
Factor f(x) = x^4 + x^3 – 8x^2 + 6x + 36 completely. Show all steps.
February 24, 2010

chemistry
When the glucose solution described in part A is connected to an unknown solution via a semipermeable membrane, the unknown solution level rises. Based on this information, what can be said about these two solutions? a.) The unknown solution had the lower concentration. b.)The...
February 24, 2010

chemistry
When the glucose solution described in part A is connected to an unknown solution via a semipermeable membrane, the unknown solution level rises. Based on this information, what can be said about these two solutions? a.) The unknown solution had the lower concentration. b.)The...
February 24, 2010

chemistry
nevermind i got it
February 24, 2010

chemistry
In the reaction A to products, A is found to be 0.489 M at t=72.0 s and 0.468 M at t=82.2 s What is the average rate of the reaction during this time interval? Do I take the Ln (0.468/0.489) = -0.04395 / 10.2 = 4.3 * 10^3. yet the comp says its wrong. i have to put it to two ...
February 24, 2010

chemistry
A 355g sample of a saturated solution of KNO3(s) in water is prepared at 25.0 degrees C. If 50g H2O is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0 degrees C, what mass of KNO3(s) will recrystallize? i have no idea where to start...
February 22, 2010

chemistry
Nope he has not responded
February 21, 2010

chemistry
How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made. (Putting...
February 21, 2010

chemistry
so would the answer be 4.8 * 10 ^ -2?? if its fewer?
February 21, 2010

chemistry
How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made
February 21, 2010

chemistry
How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made
February 21, 2010

Statistics
How do you know the p-value on megastat. On minitab It looks like it gets a different p-value than megastat. I got a number from megastat of 2.35E10 and on minitab it was 0.000.
February 21, 2010

math
Without finding the exact answer, select which of the following numbers is the best estimate of each sum or difference and justify your choices: -2/3, 0, 2/2/3. a. 1/9 + 2/5 – 1/3 – 3/4 I am confused on where to begin on this question.
February 21, 2010

chemistry
How many milliliters of glycerol, C3H8O3(d=1.26g/mL), must be added per kilogram of water to produce a solution with 4.85 mol % C3H8O3? Kinda lost -.-;
February 21, 2010

chemistry
If a hydrate of the formula decomposes when heated to produce HCl, what change would you expect to occur when a piece of blue litmus paper is held in the path of the vapor released? [Litmus paper is paper impregnated with an acid-base indicator that is blue in the presence of ...
February 20, 2010

chemistry
sorry would i multiply the moles of O2 by the 1(0.208) to get hte concentration which is proportional to the molarity?
February 20, 2010

chemistry
Okay, so this is how I think I should set it up? can you confirm it at least. Anyways I would try to find moles of O2 using ideal gas law (1.00 atm)(0.283)/(0.0821)(298) = n moles O2. then I would multiply 0.208 by the 1 L of water?? Then divide the moles of O2 / by L of water...
February 20, 2010

chemistry
Under an O2 pressure of 1.00 atm, 28.31 mL of O2 dissolves in 1.00 L H2O at 25 degrees. Determine the molarity of O2 in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O2 in air is 20.80 \%. (Have no idea how to go through with...
February 20, 2010

chemistry
oh. that's the complete opposite of what i thought. thanks
February 20, 2010

chemistry
An ideal liquid solution has two volatile components. In the vapor in equilibrium with the solution, the mole fractions of the components are (a) both 0.50; (b) equal, but not necessarily 0.50; (c) not very likely to be equal; (d) 1.00 for the solvent and 0.00 for the solute. ...
February 20, 2010

chemistry
Under an O2 pressure of 1.00 atm, 28.31 mL of O2 dissolves in 1.00 L H2O at 25 degrees. Determine the molarity of O2 in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of O2 in air is 20.80 \%. (Have no idea how to go through with...
February 20, 2010

chemistry
nope. have to contact my teacher about this.
February 20, 2010

chemistry
How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH? Ok...I got 480, and the systems says there's a rounding error. I did it again and I got 480. Someone help me?
February 20, 2010

biology 102
I've already done it, thank you. Was wondering if there were any other predictions.
February 19, 2010

biology 102
A prediction (educated guesses as to what the potential results may be) for each experiment listed below: 1) knee-jerk reflex 2) pupillary reflex (shield left eye, shine bright light into right eye, observe pupils) 3) 2-point threshold 4) temperature discrimination 5) ...
February 19, 2010

MATH
a<9. Not sure about the graph 3a<19+8 3a<27 a<27/3 a<9
February 17, 2010

Math
That's what I got.
February 17, 2010

Chemistry
Explain how to make a 1 Normal solution H3PO4.
February 17, 2010

Chemistry
What is the normality of 10 ml of an acid that took 25 ml of 0.25 N NaOH to reach pH 7?
February 17, 2010

Chemistry
You were using H3PO4 to make an acid solution. What is the equivalent weight of H3PO4
February 17, 2010

Chemistry
if you have 100 mg of CaCl2, how many moles of Cl do you have
February 17, 2010

CHEMISTRY
what is 0.00225 in two sigs? i hate sig figs -.-. thank you though.
February 12, 2010

CHEMISTRY
I calculated using the proportion and got 0.00025, and it was wrong. Then I used 9 ppb times 1000000 ml/ 1 ppb = 9000000, and used the proportion setup and still got it wrong.
February 12, 2010

CHEMISTRY
1.) A water sample is found to have 9.0 ppb of chloroform,CHCL3. How many grams of CHCL3 would be found in a glassful (250 ML) of this water?
February 12, 2010

chemistry
The second one is correct. Regarding the first one though, I calculated the grams to 6.8 g of C2H5OH. I don't quite understand the next step (regarding the density, etc)
February 12, 2010

College Math : Linear Algebra
Well I guess no one can help. :/ Oh well, I'll figure it out
February 9, 2010

College Math : Linear Algebra
Suppose A is a square matrix satisfying the equation A^3 - 2I = 0. Prove that A and (A - I) respectively are invertible. (the hint is to find an explicit equation for A^-1. To prove A is invertible, this is what I did although I don't that it's right: A^3 - 2I = 0 A(A^...
February 9, 2010

long-term
What other challenges do case workers face when working with placement of the elderly in long-term care facilities?
February 9, 2010

calculus
How large does N have to be in order to approximate the integral of cos(x^2) from 0 to 1, using the Midpoint Rule, with error at most 10^(-6)?
February 5, 2010

algebra
Find an equation of the porabola described. - Vertex(0,0);directrix x + 1 = 0
February 4, 2010

programming
I am working on a project called VB Auto Sales I am working in CH 2. I have just about completed the assignment but I am unable to group two separate sections. Assignment Modify the project from the Chapter 1 VB Auto Center case study, replacing the buttons with images in ...
February 4, 2010

Visual Basic
I should say I cannot get the special notices to work with the colors.
February 4, 2010

Visual Basic
I am working on a project called VB Auto Sales I am working in CH 2. I have just about completed the assignment but I am unable to group two separate sections. Assignment Modify the project from the Chapter 1 VB Auto Center case study, replacing the buttons with images in ...
February 4, 2010

Chemistry (Grade 11)
A radioactive sample of 141Cs has a half-life of 32.5 days. In a sample that contains 8.00*10^7 nuclei of 141Cs, how many beta particles per second will be emitted? A 19.8 B 1.7*10^6 C 71 076 D 1185 E 2.47*10^-7 The 141 supposed to be a superscript text, but firefox won't ...
February 3, 2010

6th Grade Science : Newtons First Law of Motion
Explain the idea of streamlining, as it applies to a skydiver.
January 30, 2010

6th Grade Science : Newton's First Law of Motion
Explain the idea of streamlining.\, as it applies to the skydiver. If you have the following textbook: Scott Foresman Science, 6th Grade good for you! Look on pages B102 - B105.
January 29, 2010

6th Grade math
Use prime factorization.
January 28, 2010

6th Grade math
The Odgen School marching band has 91 musicians. If there are 7 student musicians in each row, how many rows are there?
January 28, 2010

Maths
That would make more sense! Many thanks
January 28, 2010

Maths
Please could I have some guidance and advice on the following question? A multiple choice question has 4 options, A,B,C and D. The numbers of students choosing the options are in the ratio 3:1:2:14. I need to calculate the number of students choosing each option, (there are ...
January 28, 2010

shapes
if i had just a regular triangle and then it turned 90 degrees how would it look
January 27, 2010

11th grade math
secondary largest possible answre is Answer: x⋅(38-2⋅x)2 Answer: 8.06181572077
January 21, 2010

11th grade math
had this same probem for college pre-calculue couldnt solve B any other way but guess and check/logic x=4.5
January 21, 2010

6th Grade Grammar
Underline the form of to do or to have in the sentence. Today, many do their best to learn about Einstein's work. Also, what does the "to do" and the "to have" mean?
January 20, 2010

HSM210
Mrs Sue, Sorry to keep bothering you ! I have once more corrected the four answers . Do you mind checking them again. I so hate these assignments as I have such a hard time. Thank you so much for looking over my answers for me. 8. The victims’ rights movement developed ...
January 19, 2010

math
how do you solve for x using logs: [(a + b)^x]/b^x I am not sure of the steps to get there.
January 19, 2010

HSM210
Mrs Sue I corrected the answers that you said I had wrong in my assignment . Do you mind checking these for me again to see if I corrected them . Thank you so much for your help. 1. The Supreme Court has a greater obligation to protect the rights of victims than those of ...
January 19, 2010

HSM210
Mrs Sue do you mind checking my answers for me please? I have been working on this assignment for several days. The following activity helps you sharpen your skills in recognizing deceptive reasoning. The statements below are derived from the viewpoints in this chapter. Beside...
January 19, 2010

Chemistry
does postassium nitrate have a high or slow conductivity
January 12, 2010

Chemistry
sorry i mean which reactant
January 12, 2010

Chemistry
if 8.50grams CH4 reacts with 15.9grams of oxygen gass which of the prdocut is the excess and which is the limiting.
January 12, 2010

Chemistry
i got the mass of aluminum chloride to be 42.7
January 12, 2010

Chemistry
in 25grams of aluminium oxide reacts with 50grams aquoues hyrdogen chloride what is the mass of aluminum chloride produced?
January 12, 2010

6th Grade Math
Thanks!!!
January 11, 2010

6th Grade Math
Estimate a range for each sum. 3.89 + 42.71 + 12.32 I don't understand what to do for "estimating a range".
January 11, 2010

earth science
what are the landscape regions that the hudson river flows through
January 7, 2010

chemistry
how do you balance the equation __Al+__CuO=>__Al2O3+__Cu
January 4, 2010

Business
Mr Jones intends to retire in 20 years at the age of 65. As yet he has not provided for retirement income, and he wants to set up a periodic savings plan to do this. If he makes equal annual payments into savings account that pays 4% interest per year, how large must his ...
December 23, 2009

ELLS
Do you know anything about English Language Learners?
December 23, 2009

6th grade Math
thanks!
December 15, 2009

6th grade Math
The gas tank of your parents car holds 12.9 gallons of gas. Because their car averages 27.8 miles per gallon, how many times will they have to fillup the gas tank to drive to cincinnati and back? From Detroit, Michigan to Cincinnati, Ohio = 264.1 miles.
December 15, 2009

Math
6
December 13, 2009

Calculus
a) prove that the function x^3 + 9x^2 +33x assumes the value -8 at least once b)using the mean value theorom or rolle's theorom - no other methods will be accepted - prove carefully that x^3 + 9x^2 + 33x takes on the value -8 at most once
December 10, 2009

Math -- 6th Grade
Thank you drwls!
December 8, 2009

Math -- 6th Grade
The sum of two decimal numbers is 5.3. Their difference is 1.7, and their product is 6.3. What are the two numbers? Does the product have anything to do with getting the answers?
December 8, 2009

6th grade Math
Thank you Bob!
December 8, 2009

8th grade math
55 mhp to 70 mhp
November 27, 2009

physics
CBA
November 22, 2009

Economics
U.S. antitrust enforcement policies have focused on 1) Enforcing market codes of ethics 2) Preventing "golden parachutes" 3) preventing price fixing arrangements 4) forcing firms to produce output at the point where P=MC 5) breaking up any firm with more than 10 ...
November 20, 2009

comm arts
when do you use homophone besides or except? Ican attend the meeting if it is scheduled any day of the week ..... Friday. What shoul I use. except or besides? Thanks
November 17, 2009

Algebra
trnslate to na algebraic expression a number divided by 15
November 11, 2009

math
solv the inequality: 1. 7-3x [is less than or equal to] 22 ---> x [is greater than or equal to] -5 2. 4x-2/3 [is greater than or equal to] 1/3 ---> x [is greater than or equal to] 3/5 are these correct??
November 4, 2009

chemistry
Q1) 5 liters of Butane gas (C4H10) is reacted with plenty of oxygen at 27 oC and 1 atm to produce carbon dioxide and water vapor. Calculate the following: 1- The volume of CO2 produced at 1 atm and 400 oC. 2- The mass of H2O vapor produced. 3- The mol % of the products. Given...
November 2, 2009

9th grade
@bobpursley so you mean we have to do a factor tree for 1000 numbers?!
November 1, 2009

math
Find an angle between 0 and 2Ð that is coterminal with given angle. 1. -7Ð /3 2. 10 3. 51Ð /2
October 26, 2009

math
Find an angle between 0 degree and 360 degree that is coterminal with given angle. a. 361 degree b. -100 degree c. 1270 degree
October 26, 2009

council
what is a good speech of secretary and vice presidents: this is what secretary it does attend council meetings take pictures at school functions distribute and collect surveys at school funtions and from classrooms participate in council activities vice president attend ...
October 21, 2009

math
27 / (5+4) * 19 = 27 / (9) * 19=3*19=57. Mom is right.
October 21, 2009

math
it is: -y/x* (2x+y)/(2y+x) let me now if you need more details.
October 21, 2009

Social Studies
thank you!
October 20, 2009

Social Studies
Yes. Can anyone help me?!?!?!?!? Help!!!!!!!!!!!!!!
October 20, 2009

Social Studies
I did but i can not find anything.
October 20, 2009

Social Studies
I need help finding a current event. The topic is A Famous Person Who Has Done Some Type Of Charitable thing. The article can be anywhere from last thursday to today. Thank You!
October 20, 2009

math115
The electricity costs of a buisness increased from $15,000 in one year to $16,000 the next. To the nearest whole percent what was the rate of increase?=7% Write the following as a common fraction or mixed number write in lowest terms 5.035 = 5 7/200
October 20, 2009

math115
thank you
October 20, 2009

math115
Let me try it this way I am dividing 30/49 by 16/21 or 30/49 dividing by 16/21= 45/56
October 20, 2009

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