Monday
May 25, 2015

Posts by Nancy


Total # Posts: 725

math
On a map of the Fox River, 1 centimeter represents 6.5 kilometers. If a trail by the river is actually 26.65 kilometers long, what is the length of the river on the map?
November 19, 2013

Math
Solve for x: 4(2-x)>8x+20
October 17, 2013

chemistry
What is the final volume in milliliters when 0.700L of a 46.9% (m/v) solution is diluted to 20.1% (m/v)?
October 16, 2013

Chemistry-
Okay, i thought so...I was confused since I'm using N with the units in a formula but I can't seem to find a way to cancel it out. Maybe you would know how? Formula: Z= Zwall x Area 4.18x10^14 mol s^-1 / 6.04x10^23 m^-2 s^-1 = Area 8.4x10^-6 m mol = r How would I ...
October 1, 2013

Chemistry-
If I was trying to find out the number of molecules(N) using moles x avogadro's number, what units would N have?
October 1, 2013

Chemistry
A tubular fluorescent lamp in a fully evacuated supply compartment on the international space station was originally filled with a small amount of mercury vapour. When the lamp began to flicker the astronauts complained there was a tiny hole in the tube. They measured that the...
October 1, 2013

Maths
An initial-value problem is given by the differential equation, f(x,y) = –20xy2, y(1) = 1. Use the classical fourth-order Runge-Kutta method with a step-size of h = 0.02, to obtain the approximate value of y(1.02). Give your answer to 6 decimal places.
September 29, 2013

Average deviation
If I'm asked for the average deviation, what is the unit I should use for the answer?
September 28, 2013

Chemistry
An 8.07g sample of impure Ag2O decomposes into solid silver and O2(g). If 395mL O2 is collected over water at 25C and 749.2mmHg barometric pressure, then what is the percent by mass of AgO2 in the sample? The vapor pressure of water at 25C is 23.8mmHg. Could someone help me ...
September 27, 2013

Chemistry
2 NaN3(s) = 2 Na(l) + 3 N2(g) How many grams of NaN3 are needed to produce 20L of N2(g) at 303K and 776mmHg?
September 24, 2013

Chemistry
The half life of U238 is 4.5 x 10^9 yr. A sample of rock of 1.6 g produces 29 dis/sec. Assuming all radioactivity is due to U238 find percent by mass of U 238. I have tried ln(t)/ln(0)= -kt and still cannot get the answer What I get is A) 4.5x10^9 x365x60x60x24=1.419x10^17 for...
September 22, 2013

Business math
A store had 896 swimsuits that were marked to sell at $46.99. Each suit was marked down $15.90. Find the reduced price using the formula M = S – N, where M is the markdown, S is the original selling price, and N is the reduced price.
September 8, 2013

Chemistry re-post
I took a look at this question to see if I copied it correctly, and it does NOT say how much of the solution was used. It does use mols as the unit. Dr. Bob, I am not sure what you mean by "decays into Argon." I realize that the 38 CL decays to Argon, but how would ...
July 23, 2013

Chemistry
I posted this before and am sorry to post again and take up room but it is due this week and I'd like to understand how to get the answer (no one has responded yet): question The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is ...
July 22, 2013

Chemistry
I posted this before a few hours ago without a reply yet but decided I would add more detail: question The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. ...
July 21, 2013

Chemistry
The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. What is temperature of container? I have tried calculating the decay rate of the 38cl and then plugging ...
July 21, 2013

chemistry
write a balanced equation for the chain reaction AL2O3
July 13, 2013

Statistics
is that 2C = 0.0229885?
May 18, 2013

mathematic
OK but really about part C I'm confused. I think it should be 25% or 0.25 but it is wrong!!!!
May 18, 2013

math
solve by the elimination method x + y = -2 4x - 6y = -3
May 9, 2013

Calculus
In a right triangle, if one leg (adjacent to 90 degrees) is 10cm, which is increasing at the speed of 2cm/s; and another leg is 24 cm, which is decreasing at 2cm/s. how fast is the hypotenuse changing at this time?
May 6, 2013

Trig
A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.
April 21, 2013

chemistry
A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?
April 19, 2013

chemistry
A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?
April 19, 2013

math
Put this in exponent form: (3square root of x) ( square root of x cubed)
April 18, 2013

Math
Ill just use log then I think I get tht... but how did u come to 2^x=112...?
April 18, 2013

Math
Mr.Reiny, We don't use logs yet, so how do I find it without using log?
April 18, 2013

Math
Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3square root of x) ( square root of 3 cubed) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. Thanks...
April 18, 2013

gr 11 Math
Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3square root of x) ( square root of 3 cubed) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. Thanks...
April 18, 2013

math
(3square root of x) ( square root of 3 cubed)
April 18, 2013

math
Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3¡îx)(¡îx©ø) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. ...
April 18, 2013

english
Religion is non-existent and present simultaneously in the form of preconditioning and technology, social classes are used for defining individual purpose and harmony among citizens, and drug use is the backbone for provoking happiness. Would that be a good sentence?
April 16, 2013

english
yeah but how doi make this sentence into a better sentence for the endof my into like the three main points I will be discussing. How do I end my intro?? We r not allowed to us first person.
April 16, 2013

english
There is total social stability, there is almost no disease, very low crime, high rates of happiness and acceptance of death.
April 16, 2013

english
science and technology
April 16, 2013

english
so Ms.Sue, can you help me with my last sentence of intro about what three arguments. I am going to talk about in my body paragraphs.
April 16, 2013

English..Ms.Sue(take a look here please)
hmm.. well I don't know I cant think of any more...at the end how do I put it into a level 4 sentence including what I will be writing about in the body:(
April 16, 2013

English..Ms.Sue(take a look here please)
It can be a utopia since each individual is happy..right? But that is only one can u help me wid the other 2? and putting it all in a sentence... Ms.Sue!!! This is worth 15% it is a summative:( My life stinks...I need ur guidance..
April 16, 2013

English..Ms.Sue(take a look here please)
yes I understand that, I checked the sites out and they say first step is to pick up a topic, which in this case is what I don't understand, then ask a question regarding the topic than answer the question and finally reword the answer. So can u plzzzz help me with the ...
April 16, 2013

English..Ms.Sue(take a look here please)
Discuss the society in Brave New World as a utopia. What should i make my thesis be??? Please help im so lost. It is a utopia •English - Ms. Sue, Tuesday, April 16, 2013 at 1:14pm I think a good thesis would be: Brave New World reflects a dystopia, not a utopia. •...
April 16, 2013

English
But it says.. discuss the society in Brave new world as a utopia. So don't you think the thesis should be more detailed and well structured.
April 16, 2013

English
Discuss the society in Brave New World as a utopia. What should i make my thesis be??? Please help im so lost. It is a utopia
April 16, 2013

English
Its a utopia as i saiid above
April 15, 2013

English
I have already visited those sites... I have read the book and it is a utopia. I just want a excellent thesis:( but i just cant think of one. Please help me if u can.
April 15, 2013

English
Discuss the society in Brave New World as a utopia. What should i make my thesis be??? Please help im so lost.
April 15, 2013

algebra
In the early months of some year, one site added 0.6 million new accounts every day. at this rate, how many days would be needed to add 30 million new accounts?
April 14, 2013

chemistry
The escape velocity from earth is 2.5 x10^4 miles per hour. What is this speed in m/s? (1 mile 1609 m)
April 14, 2013

math
Simplify this expression by using the properties of exponents.You may leave your answer as a number to a power. (2c)^5(2c^9)^6=
April 13, 2013

finance
You have a fairly large portfolio of U.S. stocks and bonds. You meet a financial planner at a social gathering who suggests that you diversify your portfolio by investing in emerging market stocks. Discuss whether the correlation results in Exhibit 3.10 support this suggestion
April 11, 2013

Pre-Algebra
Find 3 consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 5 times the third.
April 7, 2013

Psychology
One way to measure the validity of test would be to:
April 5, 2013

Psychology
The weather person on the evening news reports that the average daily rainfall for the last six months is 10 inches. A farmer is trying to determine how the rain might affect his crops.
April 5, 2013

Psychology
My answer is A.
April 5, 2013

Psychology
Professor Webb is interested in conducting a study on gender differences and coping with stress. He should begin his research by examining:
April 5, 2013

algebra
Thank you so much
March 31, 2013

algebra
y= -x^2-12x+28 A painter can use the formula A=2/3bh to estimate the area of space under the parabola. Calculate area in square ft under each arch ~ if there are 8 arches to be painted how many square ft must be painted ~ if 1 gallon paints 200 square ft , how many gallons ...
March 31, 2013

Math
Jimmy jumped into a lake from a 12-foot-high cliff with an initial upward velocity of 7 feet per second. Find the time in seconds it took Jimmy to enter the water. Use the model for vertical motion given by the equation h = -16 t squared + vt + s
March 28, 2013

Chemistry
this is the equetion for question 2 CaO+2NH4Cl-2NH3+H2O+CaCl2
March 20, 2013

Chemistry
1. The reaction CO+2H2-CH3OH was carried and it is found that only 332g of CH3Oh is actually produced when 407g CH3Oh was the expected yield. What is the Percent yield? 2. If 112g of CaO is reactied with an excess of NH4Cl and 64.0g of NH3 are produced, what is the percent ...
March 20, 2013

curriculum development
The size of a play/work area in the class made a noticeable difference in the time children stayed there and were engaged in complex play. The best size area is A) small and open B) large and open c) small and sheltered or d) large and sheltered. is B) large and open correct?
March 19, 2013

Exceptional children
i appreciate ure help! can u check this last one for me The final goal of a functional approach to managing prblem behavior is to a.) change the child b.) replace an inappropriate behavior with a good one. c.) change the environmet or d.) help child understand how to behave. i...
March 19, 2013

Exceptional children
Can you check my answers please Adaptive behaviors are a.) the same as fuctional skills b.) different from functional skills c.) exclude functional skills or d.) include functional skills. this is tricky for me but i'm guessing d.) include funtional skills. Does this sound...
March 19, 2013

geometry
If the measure of ÐDAB = 50°, and ÐDAC = 20°, what is ÐCAB?
March 13, 2013

Chemistry
If you have 1.90 mol of H_2 , how many grams of NH_3 can be produced?
March 5, 2013

Chemistry
If you have 1.90 mol of H_2 , how many grams of NH_3 can be produced?
March 5, 2013

Physics
Ok so F=MA thanks, I do appreciate especially since I am going to 35th reunion and went back to school. Much harder than I remembered. Again thanks
March 5, 2013

Physics
Sorry just re-learning after 30+ years.I had part of it answered however, the 4th and 5th question info was pertaining to questions 3 and 4 so I had to ask the question from the beginning. My answer was T = 1.585 s. for speed I calc 0.942/1.585s=0.594...right? my real problem ...
March 5, 2013

Physics
A 0.500 kg particle moves in a circle of R=0.0150 m at constant speed. The time for 20 complete revolutions is 31.7 s. What is the period T of the motion? What is the speed of the particle? What is the centripetal acceleration of the particle? What is the centripetal force on ...
March 5, 2013

chemistry
the equilibrium constant of the decomposition of NOCL is 1.6*10^-5. calculatethe concentration of all species at equilibrium if initially 3.52 mol of NOCL is placed in a 5.00 L container
March 4, 2013

Chemistry
The triprotic acid H3A has ionization constants of Ka1 = 6.8× 10–3, Ka2 = 8.1× 10–9, and Ka3 = 5.0× 10–12. Calculate the following values for a 0.0760 M solution of NaH2A [H+] = ? [H2A-]/[H3A]= ? Calculate the following values for a 0.0760 M ...
February 26, 2013

Chemistry
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.100 M phosphoric acid solution. pKa1 = 2.16 pKa2 = 7.21 pKa3 = 12.32 [H3PO4] = ? [H2PO4-] = ? [HPO42...
February 26, 2013

Chemistry
What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 7.22?
February 26, 2013

Chemistry
A certain indicator, HA, has a Ka value of 1.3 × 10-6. The protonated form of the indicator is blue and the ionized form is red. What is the pKa of the indicator? What is the color of this indicator in a solution with pH = 8? Blue, red, or purple?
February 26, 2013

Chemistry
This question has been bugging me for a long time. A rock contains a Pb-206 to U-238 mass ratio of .145 to 1.00. Assuming that it did not contain any Pb-206 at the beginning of its formation, determine its age. I assume from the other problems in my book that the 1/2 life is 4...
February 23, 2013

chemistry
However, when I try to find the rate constant I get 3.5. My book says 3.5^-.5. I don't know how they got this. .0069= (.010)^.5(.020)=approx 3.5 but the book says 3.5M^-1/2*s-1 Also I am wondering if there are three reactants in a problem, is there any difference how it is...
February 23, 2013

chemistry
I have a problem like this: CHCl3 + Cl2 = CCl4 +HCL This is the rate table: CHCL3 Cl2 Initial Rate .010 .010 .0035 .020 .010 .0069 .020 .020 .0098 .040 .040 .027 They want me to find the rate constant and the rate law.
February 23, 2013

Math
At a summer camp, one boy and one girl will be selected to lead the weekly activities. If there are 130 boys and 145 girls at the camp, how many different 2 person combinations of 1 boy and 1 girl are possible?
February 5, 2013

Math
On friday, a computer was priced at $800. on the following wednesday, the price was reduced by 15%. On the following friday, the price was further reduced by 20%. what percent of the original price was the final price ?
February 5, 2013

Chemistry
180
January 29, 2013

english
The reason your voice matters is because its part of the way you want to be respected, spoken to, as well as you are part of a family of individuals. The fact that you have ideas of your own and you have values and an opinion is also why your voice should be heard. You have ...
January 8, 2013

geometry
LPG is stored in highly insulated spherical vessels in most oil refineriesif.If the inside diameter of one of these tanks is 11.4ft, find it's volume. Report your answer to the nearest one-tenth of a gal. Use r=3.14 and 1 cubic ft=7.5gal
December 29, 2012

geometry
find the volume of an industrial tank in the form of a horizontal cylinder whose radius is 2.6 yd, and whose length is 8.4 yd. rr=3.14
December 29, 2012

chemistry
When compound A is heated with acid compound B forms. Ahas the formula C3H8O and B is C3H6. When Ais oxidized compound D forms that is further oxidized to carboxylic acid. What are compounds A, B, and C.
December 17, 2012

chemistry
What is the pH of a solution prepared by dissolving 1.533 g HCl in water to make 420 mL of solution
December 17, 2012

biology
Following the usual pathway of circulation blood flows from the __________ to ___________, to_____________and to__________
December 14, 2012

biology
The ___________ ____________ supplies blood from the heart to all organs except the lungs
December 14, 2012

biology
Terms like punctiform and round relate to colonial ____________while smooth and curled relate to colonial___________
December 14, 2012

biology
Traditional phylogenetic results have been challenged by the results of _________________
December 14, 2012

pre-algebra
the perimeter of a pool is 150m. the width is 1/2 its length. what are the dimensions of the pool
December 13, 2012

Chemisrty
A 10.0 g sample of ice at -14.0°C is mixed with 124.0 g of water at 81.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g°C, respectively, and the enthalpy of...
December 9, 2012

Accounting
Harris company borrowed 65,000 by giving 10 year , 6% installment note to Cuba Bank The note requires annual payments of $8832 first payment occuring on the last day of the fiscal year. the first payment consists of interest of $3,900 and principal repayment of $4932, Issued ...
December 6, 2012

Psychology
the spillover effect is best explained in terms of the?
November 17, 2012

nuclear chemistry
wouldn't you divide by the speed of light squared? nuclear chemistry - andrew, Saturday, November 10, 2012 at 8:26pm E=mc^2 10^6 J/s are being produced (1Mw) 10^6 J/s = m (3.0e8 m/s) solve for mass to find amount of mass lost in one second. ~ .0033kg
November 10, 2012

nuclear chemistry
A typical nuclear reactor produces 1mw of power per day. What is the minimum rate of mass loss required to produce this energy. Don't know where to start
November 10, 2012

chemistry
never mind I got it thanks!
November 8, 2012

chemistry
This all that I have, what other information do I need?
November 8, 2012

chemistry
I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in hydrate sample(g) 2. number of moles of water ...
November 8, 2012

math
Ashley needs $30 more in order to buy a concert ticket. she has saved money from her birthday and christmas presents. Her b-day present was 1.5 times the amount of her christmas present. Her b-day present was $60. if she saved 80% of her presents, how much does the concert ...
November 6, 2012

math
if 2 small containers and 1 large container together hold 10 cups of water, and 1 large container minus 1 small container leaves 4 cups of water, how many cups of water does the large container hold.
November 6, 2012

Business Math
Hafers, an electrical supply company, sold $4,800, 12%, 90-day note for a time extension of a bill for goods bought by Ron Prentice. On June 12, Scott discounted the note at Able Bank at 10%. What is the Maturity Value (MV).
November 6, 2012

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