Friday
October 24, 2014

Posts by b


Total # Posts: 274

Algebra
Belle is swimming in the lake and is 230 feet from shore. She starts to head back to shore at arate of 2ft/s. Ten seconds later, Max hops in a row boat and rows towards Belle at a rate of 5 ft/s. How many seconds will Bell have been swimming when Max reaches her?
October 16, 2014

Algebra
Please help I am lost on this one and another one i posted
October 16, 2014

Algebra
A car leaves Denver at 30 km/h traveling south. Two hours later, another car leaves Denver traveling south at 40 km/ h. How many hours had the first car been traveling when the second car catches up?
October 16, 2014

Algebra
The length of a rectangle is 3 times the width. If the length is increased by 4 cm and the width is decreased by 1cm the parimeter will be 102 cm. find the dimensions of the original rectangle. I don't know the equation, please show the work. Not just the answer. So I can ...
October 16, 2014

math
Four ways to determine a plane: 1) two parallel lines 2) two intersecting lines 3) three noncollinear points 4) a line and a point not on the line
October 9, 2014

math factoring
factor 2x^4+12x^3-18x^2-108x
October 5, 2014

chemistry
If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?
September 28, 2014

MATH
How do i find the center of a circle using 3 points. Also need to find the radius and the equation of the circle.... My 3 points are (2,8) (-4,6) (1,-1) I found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And...
September 25, 2014

Please Help! Math
How to find the center and radius of a circle using 3 points... My 3 points are (2,8) (-4,6) (1,-1) I found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And the Equation of the perpendicular bisector of the ...
September 25, 2014

business
. You've written a check to Goodwill Supply, and the check has been lost. What should you do? A. Stop payment on the first check; then write a second one. B. Send a counter check to Goodwill. C. Write another check immediately. D. Call Goodwill and tell them you'll ...
September 22, 2014

office
A
September 19, 2014

office
Which of the following organizations would most likely use an unabridged dictionary? A. The English department at a large university B. An automotive dealership C. A large retail department store D. A pediatrics hospita
September 19, 2014

Algebra help
I know how to get the slope. In my answer key it has the solution of -1\3x +10/3 What i don't get is how they got the +10/3 part
September 17, 2014

Algebra help
Find an equation of the line L, where L is perpendicular to y=3x and passes through the point (1,3) Please help I'm not sure what formula to use or how to work out this problem
September 17, 2014

Algebra
Use a graphing utility to approximate the real solutions if any, of the given equation rounded to two decimal places. x^3-9x+1=0
September 17, 2014

math
Are the two solutions to x (2x+1) = 1 found by setting x = 1 and 2x + 1 = 1? Explain your reasoning. What are the solutions to this equation? Show how you arrived at your answer. Create an equation for your classmates to solve that requires factoring.
July 3, 2014

math
84
June 26, 2014

aLGEBRA
5/4X+7/12=1/3X-1/6
May 14, 2014

math
ABCD is a rectangle. If AC = 2(5a + 1) and BD = 2(a + 1), find the length of each diagonal.
May 9, 2014

Chem.
At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?
April 1, 2014

English IV
Help Please! Choose the function of the italicized infinitive phrase shown below. (stars indicate italicized infinitive phrase) Meridith is *to be restored as captain.* Answer Options: Function of infinitive: Adjective, Adverb, or Noun. (I chose adverb & got it wrong)
February 20, 2014

Chemistry:Important!!!!!!!
Thank you! I was just missing the step of multiplying by atomic mass! :)
February 10, 2014

Chemistry:Important!!!!!!!
A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield
February 10, 2014

office finances
the answer is B. stub
December 28, 2013

Social Studies
idk pls help
December 23, 2013

engineering
No idea. But i want to know. Does anyone have an idea??
December 19, 2013

Finance
The spot exchange rate for the Canadian dollar is Can $1.14 and the six-month forward rate is Can $1.17. Calculate whether a U.S. dollar or a Canadian dollar is worth more.
December 17, 2013

chemistry
Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?
December 8, 2013

chemistry
Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2  3CO2 + H2O
December 8, 2013

chemistry
Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog. The reaction is: 2NaOH + Al + 6H2O  2NaAl(OH)4 + 3H2 (note: balance the reaction first) What mass of ...
December 8, 2013

algebra 2
3x+3y
December 1, 2013

mahs
(2a+8b)
December 1, 2013

chemistry
What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2
November 10, 2013

chemistry
What mass of ammonia is produced when 1.48 L of nitrogen (at STP) react completely in the following equation? N2 + 3H2 --> 2NH3
November 10, 2013

BioChem
In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that contains 2.50 × 102 ...
October 30, 2013

Biochem
In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that contains 2.50 × 102 ...
October 30, 2013

General chemistry
123
October 16, 2013

Stats
The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task...
October 2, 2013

fractions
a recipe calls for 1/4 teaspoon of salt. to make three times the amount how much salt is needed?
September 24, 2013

chemistry
density = mass/volume mass = 6.4 grams volume = 28.61 mL - 27.80 mL = 0.81 mL density = 6.4 grams/0.81 mL density of Fe = 7.9 g/mL
August 29, 2013

Precalculus
Thank you!! I combined the terms when I isolated the LCD and received the following: a^2 +5a - 2a - 10 = 3a^2 + 15a etc..until I received: 2a^2 + 12a + 10 = 0 I wasn't sure what step to complete in order to obtain -5/2 as my final answer.
August 29, 2013

Precalculus
Is a+5 the proper LCD to isolate from the equation in order to obtain -5/2?
August 29, 2013

Precalculus
Solve for a. a/a+5 - 2 = 3a/a+5
August 29, 2013

Pre-Calculus
How to write this conic section in standard form? 3y^2 = 108 - 12x^2
June 5, 2013

Pre-Calculus
How to write this conic section in standard form? 3y^2 = 108 - 12x^2
June 5, 2013

Physics
its a mystery
May 24, 2013

chem
a grocery store sells vinegar in 1Lbottles. based on your results, how many grams of acetic acid are in a bottle?
May 13, 2013

math
use r=3/2, nowhere does it say r is an integer. 64,96,144,216,324,486
May 12, 2013

physics
23.4444444444444444
May 11, 2013

math
The buying and selling commission schedule shown below is from a well-known online discount brokerage firm.? Taking into consideration the buying and selling commissions in the schedule find annual rate of interest earned by each investment? Transaction Size Commission Rate $0...
May 2, 2013

Physics
Tut tut, your supposed to do your own MIT exam questions, not ask other to do them for you.
April 27, 2013

Chemistry
Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?
April 19, 2013

Chemistry
Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?
April 19, 2013

Chemistry
Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)
April 19, 2013

social studies
How can you remember facts about the revolutionary war
April 16, 2013

Chemistry
How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)
April 4, 2013

Chem
(Sp Heat)(Change in Temp)(Mass)=
April 4, 2013

Chemistry
The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.
April 3, 2013

Chemistry
How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?
April 3, 2013

Legal aspects of health Information management
Im wondering, too!
March 22, 2013

Chemistry
What is the hydroxide ion concentration of a 0.370M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1=5.6x10^-2 and Ka2=5.1x10^-5
March 19, 2013

Chemistry
What is the concentration of CO3^-2 in a 0.028M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11
March 19, 2013

PHYSICS
A bottle containing 4 kgof water at a temperature of 15°Cis placed in a refrigerator where the temperature is kept at 2°C.How much heat is transferred from the water to cool it to 2°C?
March 18, 2013

math
A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second selection is made.
March 3, 2013

Cosmology
The abundance of irregular galaxies across clusters
March 1, 2013

bioelectricity
Let Pk, Pna and Pcl be permeabilities of squid axon membrane for potassium, sodium and chloride, respectively. During the rest, the ratios of permeabilities are given by Pk:Pna:Pcl = 1.0 : 0.043 : 0.44 During the peak of an action potential these ratios become Pk:Pna:Pcl = 1.0...
February 19, 2013

bioelectricity
Cl equil-v: Only chloride may cross a membrane separating two compartments. At a temperature of 26∘C, the concentrations of chloride ions are: intracellular: 70 extracellular: 485 What is the equilibrium potential? Give a numeric answer within 1%, in mV.
February 19, 2013

Bioelectricity
K equil-v: Only potassium may cross a membrane separating two compartments. At a temperature of 30∘C, the concentrations of potassium ions are: intracellular: 280 extracellular: 110 What is the equilibrium potential? Give a numeric answer within 1%, in mV.
February 19, 2013

Bioelectricity
Na equil-v: Only sodium may cross a membrane separating two compartments. At a temperature of 28∘C, the concentrations of sodium ions are: intracellular: 100 extracellular: 485 What is the equilibrium potential? Give a numeric answer within 1%, in mV.
February 19, 2013

bioelectricity
At a temperature of 10∘C, the concentrations of ions are: IonIntracellularExtracellular Na61485 K28010 Cl51485 The transmembrane potential is -30 mV. How many ion species (Na, K, or Cl) are NOT in equilibrium?
February 19, 2013

bioelectricity
Assume that frog muscle cell membrane is permeable to Na and K only. The membrane permeabilities for Na and K are Pna and Pk respectively. At 16∘C, the resting membrane is -91 mV. What is the ratio of permeabilities Pna/Pk? For frog muscle, intracellular and ...
February 19, 2013

math
Ryan estimates that he uses 2/3 cup of syrup each time he eats pancakes. How many times will he be able to eat pancakes without running out of syrup if he has a giant bottle of syrup that contains 48 cups. Do you multiply 48x2/3 and get that he will be able to eat 32 pancakes?
February 13, 2013

Physics
A mountain-climbing expedition establishes two intermediate camps, labeled A and B in the drawing, above the base camp. What is the magnitude Δr of the displacement between camp A and camp B?
January 31, 2013

Chem
how to prepare a 250 mL solution of .15 M K2SO4 with a volumetric flask
January 15, 2013

Grammar
Need thesis stAtement for persuasive research paper on cs lewis
January 10, 2013

Physics
Car A is traveling at 18 m/s and car B at 25 m/s. Car A is 300m behind car B when the driver of Car A accelerates his car with an acceleration of 1.80m/s^2. How long does it take car A to overtake car B?
January 8, 2013

math
List order of numbers from least to greatest is the following correct? 1 3/7 1 2/4 1 8/14 1 3/4
January 8, 2013

physics
If the hockey puck lies on the ice and is struck by a hockey stick with a force of 2.60e+03 N, what is the acceleration of the hockey puck
January 1, 2013

HISTORY HELP ME
oh thats cool way to show feelings
December 19, 2012

HISTORY HELP ME
i think it d
December 19, 2012

HISTORY HELP ME
28. Which answer best describes how some enslaved African Americans expressed their emotions? (4 points) They didn’t believe in public emotional displays, so they would often express themselves only to the tribal chief. They participated in sports like archery and ...
December 19, 2012

math
Estimate each quotient 535.6/35?
November 27, 2012

Physics
A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.
November 24, 2012

Physics
An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?
November 23, 2012

Chemistry
(a)What is the bond order of the diatomic molecule BN? (b) Is BN paramagnetic? (c) Rank the following compounds in order of increasing bond energy: B2, N2, BN. (d) Rank the following compounds in order of increasing bond length: B2, N2, BN.
November 18, 2012

Science
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?
November 18, 2012

Chemistry
Rb<Se<Cl
November 18, 2012

Chemistry
right!!!
November 18, 2012

Chemistry
right!!!
November 18, 2012

Chemistry :'(
right!!!
November 18, 2012

Chemistry :(
(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg
November 18, 2012

Chemistry
-430.5
November 17, 2012

chemistry
equation?
November 17, 2012

chemistry
-430.5
November 17, 2012

chemistry
equation please
November 17, 2012

math
what is 14.76 rounded to the nearest hundredth?
November 16, 2012

science
-430.5
November 16, 2012

physics
blocks 1 and 2 of masses 2 kg and 4kg, respectively, are connected by a light string, as shown above. These blocks are further connected to a block of mass 3kg by another light string that passes overr a pully of negligible mass and friction. Blocks 1 and 2 move with a ...
November 13, 2012

Physics
At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of 92 N at an angle of 30 as shown in the figure below. The box of books has a mass of 22.0 kg, and the coefficient of kinetic friction between the ...
November 5, 2012

Chemistry
If the theoretical yield of a reaction is 18.6 grams & 7.6 grams were collected the.experiment, what is the percent yield
November 5, 2012

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