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November 21, 2014

Posts by bob


Total # Posts: 2,477

6th grade writting
how many paragraphs is an essay?
May 29, 2010

chem
1 molar solution of Pb(NO3)2 you want 3mL of 0.5 Molar Pb(NO3)2 how much of the one molar solution do you mix with H2O to reach your goal
May 27, 2010

Statistics - Urgent
If there were two groups: One group who saw a yardstick before estimating its length Another group who did not see a yardstick before estimating its length Would this be a matched pairs design (a person from both groups estimates at the same time, then the next pair, etc.)? Or...
May 26, 2010

Statistics - Data Collection
Specifically for a two sample t test on difference in means with a matched-pairs design. What would the step-by-step process be for a simple random sample from the cafeteria population?
May 26, 2010

Statistics - Data Collection
If you were in a cafeteria full of students and you wanted to randomly divide 10 students into group A and 10 students into group B, what would be the least biased way to do it?
May 26, 2010

science
How can an animals structure help survive in different environments? give three examples
May 25, 2010

statistics
To reduce theft, the Meredeth Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both guilty and innocent subjects). George Meredeth decides to fire all employees who fail the test. Suppose 5 percent of the ...
May 23, 2010

math
No One was Not taking any of these,Because 33+13=46
May 21, 2010

posting box
That might be from loading and You may just not have the settings it needs
May 20, 2010

social studies
Republicans
May 19, 2010

all subjects
Yes I love it!!It gives me a bunch of help and it is VERY fun I spend HOURS o this.And Ms.Sue Is ALOT of help,She has Complete Answers And Gives you Websites if she has a good 1!Thanks A BUNCH Jiskha I LOVE this!
May 19, 2010

True False
False It should be "Many students anticipate spring break,But Luise looks forward to Winter vacation more."
May 19, 2010

QUICK! BE THE FOURTH PERSON TO CLICK TO WIN BIG $!
This was a HUGE waste of time
May 18, 2010

Africa
Gorillas are from there!!!! :)
May 16, 2010

english
OF COURSE!!!!!!
May 16, 2010

math
how many ways can 9 cars be parked in a row of 9 parking spaces?
May 16, 2010

chemistry
thank you very much DrBob!!I really appreciate this
May 15, 2010

chemistry
how many grams of oxygen is required to produce 2.0 kg of water??
May 15, 2010

science /chem
yup that's right
May 12, 2010

algebra
What should you say if you see a tall wrought-iron tower in paris, france?
May 12, 2010

5th grade
I am A 5th grader To.Blameless,Exculpated,and Simply Not Guilty.
May 12, 2010

Data Management
Oh also n is the total number of tickets which in this case is 1000000
May 10, 2010

Data Management
P(x) of 1000000 is 1/1000000 P(x) of 50000 prize is 2/1000000 P(x) of 1000 prize ia 10/1000000 P(x) of 50 prize is 200/1000000 P(x)=p Find E(x) for each one E(x)= n.p Then add all E(x) values to find the expected value of all prizes for one ticket Finally, that that total and ...
May 10, 2010

english
true but dount
May 10, 2010

Social Studies
What large city is northeast of New York City?
May 7, 2010

math
12
May 6, 2010

chemistry
A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11...
May 4, 2010

chemistry
Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.
May 4, 2010

chemistry
Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone and ethanol.
May 4, 2010

chemistry
Calculate the sodium ion concentration when 55.0 mL of 4.5 M sodium carbonate is added to 15.0 mL of 3.0 M sodium bicarbonate.
May 4, 2010

earth and space science
i like pie
April 29, 2010

chemistry
What must be the pH of a solution that is 0.067 M Fe3+ to just cause Fe(OH)3(s) to precipitate?
April 28, 2010

math
prove the following: given: ABCD is a trapezoid with bases BC and AD to prove: BX • AX = DX • CX X is the intersection of the segment going from BD and AC i need the answer in a two column proof statements Reasons 1. ABCD is a trapezoid with 1. given bases BC and AD ...
April 28, 2010

physics
In the figure below, a box of Cheerios (mass mC = 0.8 kg) and a box of Wheaties (mass mW = 2.5 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.0 N, and the ...
April 26, 2010

ACCOUNTING
if a company issued $32,000,000 of 10-year, 12% bonds at an effective interest rate of 13%, receiving cash of $30,237,139 and interest on the bonds is paid semiannually how do you calculate the first semiannual interest payment and the amortization of the bond discount?
April 26, 2010

math
38 animals
April 22, 2010

physics
It emits a sound, so the equation is Intensity = Power / 4(pi)r^2 r being the distance, 158 meters.
April 21, 2010

AP Chemistry
I decided to set up an ICE chart but I am a little confused. This is what I did: CaCl2 + K2SO4 = CaSO4 + 2 KCl I 0.020M 0.20M 0 0 C -X -X +X +2X E 0.020-x 0.20-x 0+x 0+2x Am I right in saying this? Additional information: Ksp= (CaSO4)(KCl)^2 / (CaCl2)(K2SO4) Ksp= 2.4 x 10^ -5
April 21, 2010

AP Chemistry
100. mL of 0.020 M CaCl2(aq) is added to 200. mL of 0.20 M K2SO4(aq). Calculate the equilibrium concentrations of Ca^2+ (aq) and SO4^2-(aq)
April 21, 2010

Finance
Suppose you are considering two investments, stock A and stock B. The beta of A is 1.20, and the beta of B is 0.80. Stock A has an expected return of 12% and Treasury Bills are yielding 3%. If the two stocks are fairly prices, what's the expected return on the Market Index...
April 20, 2010

College Chemistry
If you have the molecular weight of ethanol which is 46.1 and the concentration is 4.0% w/v. What is the molarity
April 20, 2010

physics
Frank stands at the base of a building. He throws a 0.12kg rock straight up at a speed of 28m/s so that it rises to a maximum height of 12m above the top of the building and then falls straight down on the roof of the building. a) What is the height of the building? b) What is...
April 18, 2010

physics
A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third season?
April 18, 2010

physics
Does a free falling object have a velocity of zero? If it does then is it zero for the initial velocity or the final velocity?
April 18, 2010

Physics Gr.11
thanks!
April 18, 2010

science
does the pumping of a soap dispenser have anything to do with boyles law?
April 18, 2010

math/substituion method
x+3y=-6 3x+9y=6
April 17, 2010

Langusge Arts
what are the metaphors in here
April 14, 2010

English
buhgtuyrvwo6qtp28 qte87p2ety q2hye89ggggggggggggggggggggggggggggggggggggs7yu8oydu8yqo9syvqwhyuivy2qgeuyv7iqwugecuyl wgehjygtw tdgyhbwvg dguywbg sduyqw gt7yqwe utys ugsv asuyw vdb syyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyys7duiw68d6vw6ed
April 14, 2010

trig
8========)--------
April 13, 2010

Chemistry
Assuming that sea water is a 3.5 wt % solution of NaCl in water, calculate its osmotic pressure at 20°C. The density of a 3.5% NaCl solution at 20°C is 1.023 g/mL.
April 13, 2010

Chemistry
How much heat is released when 75.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol °C), and the molar ...
April 13, 2010

Chemistry
Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 25.0°C to gaseous CCl4 at 76.8°C (the normal boiling point for CCl4)? The specific heat of CCl4(l) is its heat of fusion is and its heat of vaporization is
April 13, 2010

Science
When 260. mL of 1.50 x 10-4 M hydrochloric acid is added to 125 mL of 1.75 x 10-4 M Mg(OH)2, the resulting solution will be
April 13, 2010

chemistry
We want to make 100. mL of 1.0 M NaA solution by dissolving solid NaA in water. What mass of solid NaA is needed?
April 12, 2010

9th grade geometry
take 360 divided by how many slices it was cut into for the arc of each. divide 360 by that number, multiply it by pi, than multiply it by the radius. that'll give you the area of one slice, so all you have to do now is multiply the area of one slice by 3 for all 3 slices...
April 12, 2010

math riddle algebra pizzaz
living in x aisle
April 12, 2010

geometry
i have only a measuremment for one side of a triangle need to find the other to to find area how do i do this
April 12, 2010

Calculus
How did you guys get those formulas I have the same question and I have no idea how to start it
April 10, 2010

phisics
676
April 7, 2010

chemistry
Strontium-90 has half-life of 28 years. if a 1.00-mg sample was stored for 112 years. what mass of Sr-90 would remain?
April 6, 2010

MATH
IS 8 FL OZ ONE CUP
April 6, 2010

Chemisty
7,9
April 5, 2010

accounting
I am attempting to study for an exam for tomorrow and cannot figure out the equity method entries up to 2006 for this problem, can someone please help! Parent Corporation owns 80% of Subsidiary Corporation’s outstanding common stock that was purchased at book...
April 5, 2010

chem lab (webwork)
the answer is NOT d!!...i just did it and got it wrong -__-
April 5, 2010

elementary math
when finding the factors for 841 what is the largest factor you would have to test?
April 2, 2010

algebra
6 over x to the 10th times x to the 17th over 15
April 1, 2010

algebra
6 over x to the 10th times x to the 17th over 51
April 1, 2010

science
The ______ of a transverse wave is the distance between 2 crests or 2 troughs.
March 31, 2010

Geography
32. Bucharest, Romania 33. Budapest, Hungary
March 30, 2010

Statistics
How do you calculate the value of z* and t* on the TI-84 and TI-89 (the number used in confidence intervals)?
March 30, 2010

Math
I know that's the first thing that comes to mind, but my teach said that it can be done. He said that the answer is $0.05, so if someone can work backwards somehow and explain to me how he arrived at that answer I would appreciate it. :)
March 28, 2010

Math
If a bottle and a stopper cost $1.10. How much does the stopper cost?
March 28, 2010

math
X= 1
March 28, 2010

reiny
Where did you get .55? I don't need the slope I don't think. This is a pretty straightforward Q, I don't need to graph it.
March 28, 2010

another word problem!
iN 1993, THE LIFE EXPECTANCY of males was 68.6 years. In 2000, it was 71.1 years. Let E represent the life expectancy in year t and t represent the number of years since 1993. The linear function E(t) that fits this data is: E(t)=_t + _ (round to the nearest tenth) Use the ...
March 28, 2010

please help! Examples in book are different!
train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?
March 28, 2010

word problem
train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?
March 28, 2010

math
I need help! Solve by hte elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!
March 28, 2010

math
how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!
March 28, 2010

math
Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!
March 28, 2010

math substitution method
I know this! Put it in for x. So 7(28-6y) +5y=-26 use that to get y, then plug your answer for y into one of the equations to get x
March 28, 2010

math
Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!
March 28, 2010

algebra/common math
how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!
March 28, 2010

algebra
I need help! Solve by hte elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!
March 28, 2010

3rd grade
Unscramble cioponam
March 23, 2010

6th grade - English
what is the antonym for ndrvr
March 22, 2010

MATH - Can someone please help!
What is the solution of the interval notion? x less than 6 and x greater than -3
March 21, 2010

algebra
How do I solve this with the elimination method? 5x-10y=4 5x-10y=5 I need x=, and y= to get an ordered pair, but every time I mult. by a neg, everything goes away instead of just one variable! please help!
March 21, 2010

chemistry
At 300.K and 1.00 atm, assume that 25 mL of NO gas reacts with 22 mL of oxygen gas and excess water to produce nitric acid according to the following equation: O (g) H O(l) 2 HNO (g) 2 2NO(g) 3 + 2 + 2 ⎯⎯→ 3 . If all of the nitric acid produced by this ...
March 21, 2010

Math
What is the solution of the interval notion? x less than 6 and x greater than -3
March 21, 2010

algebra
how do I break this down? 4x-7 <-4 over 6 the 4x-7 is all over 6 (like a fraction) I thought I just multiply by 6 to get rid of the fraction?
March 20, 2010

algebra
YOU ARE RETART JEWBU
March 17, 2010

6th grade math
answear is x>54(11)+ 20 what is x,=81
March 16, 2010

chemistry
What are the probably products of... a) an aqueous solution of two ionic compounds b) a single compound c) two elements d) oxygen and a compound of carbon and hydrogen ?
March 16, 2010

Environmental Science
very helpful :)
March 15, 2010

math
How do I solve the equations using the elimination method: .3x-.2y=4 and .4x +.3y= 49/23 Normally I would multiply the decimals by 10 to make them whole numbers, but that fraction is really throwing me off. What do I multiply to eliminate that fraction? Please help!
March 14, 2010

Auditing
1. Which of the following matters would an auditor most likely consider to be a significant deficiency to be communicated to the audit committee? A. Management's failure to renegotiate unfavorable long-term purchase commitments. B. Recurring operating losses that may ...
March 11, 2010

Math 208
3....
March 8, 2010

Math 208
3....
March 8, 2010

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