Monday
December 22, 2014

Posts by John


Total # Posts: 6,393

statistics
Suppose that 98% of your customers in your market have internet access and you select a random sample of 500 customers. What is the standard error of the proportion of customers who don’t have internet access? I seem to be struggling with no standard deviation listed
May 10, 2012

english
Please read the following excerpt from an essay, and answer the question that follows. Biologically, adolescence is marked by hormonal changes that produce secondary sexual characteristics. These include breast development in females and beard growth in males. (Psychologically...
May 10, 2012

Statistics
Compute a one-way ANOVA - Give the source table, test null hypothesis at .05 level. Please explain the steps to solving this. Group 1: 26, 34, 46, 48, 42, 49, 74, 61, 51, 53 EX 1 : 484 Ex 1^2 : 25,024 n = 10 Group 2: 51, 50, 33, 28, 47, 50, 48, 60, 71, 42 EX 2 : 480 EX 2^2 : ...
May 9, 2012

math
which equation = (1,1)and(0,-1)and (-2,-5) A.y=2x-1 orB.y=x-1 0r C.y=2x+1 or D. y=x+1
May 9, 2012

Chestry
Yes chemistry
May 8, 2012

Chestry
If there are 8.8 moles of h2 and co2 in a 500 ml container at equilibrium how many moles of co and h2o would be present?
May 8, 2012

english
i have to do an english presentaion for my grade 12 class about a book that i was assigned, how can i involve the class in my presentation?, the book i had to read is called "fall on your knees"
May 8, 2012

math
oh didnt see the the last sentence
May 7, 2012

math
7 hours
May 7, 2012

math
A telephone pole casts a shadow 16 feet long at the same time that a man 6 feet tall casts a shadow of 2.4 feet. How tall is the pole?
May 7, 2012

Algebra
120 meters of fencing is used to fence 3 sides of a dog park against an existing wall. if the width of the park is w, find the length of the field in terms of w
May 6, 2012

physics
during a process, 21.6 MJ of heat is added to closed system. if the internal energy is increased by 59.6 MJ, how much work in Btu was done? is the work done on ro by the system?
May 5, 2012

algebra 2
by gruoping...!!
May 5, 2012

phi 103
I brought a pair of shoes from that store that immediately fell apart. their shoes are no good. Does this falls under Begging the question fallacy?
May 5, 2012

Chemistry!!
1) Write balanced chemical equation for the oxidation of Fe^2+(aq) by S2O6^2-(aq)? 2)Write balanced chemical equation for the oxidation of Fe^2+ by N2O 3)Write balanced chemical equation for the oxidation of Fe^2+ by VO2+
May 4, 2012

math
Solve this system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions 3a+5b=-19 5a-27b=145
May 3, 2012

English II - Animal Farm
My assignment is to find the human vice that each of the seven commandments intended to prevent in the novel, Animal Farm. First, I do not know what human vice the following two are supposed to prevent: Whatever goes upon two legs is an enemy. Whatever goes upon four legs, or ...
May 3, 2012

math
how long will $600K last, assuming it earns 6% a year with a withdrawl of 4% annually and inflation rate of 2%
May 2, 2012

math
Name the point of intersection for the following system, if it exists. Your answer will be an ordered pair, no solution, or infinitely many solutions. 4x-3y=-3 3x-y=-6
May 2, 2012

PHYSICS
a uniform stick weighing 50Newton is suspended from the ceiling while the other end of it rests on the floor and making an angle 60degree along with horizontal. the string makes a 15 degree angle with the vertical. find the minimum value of the coefficient of static friction ...
May 1, 2012

physics
a person 0f mass m = 60 kg walks along the radius from the periphery to the center of a circular platform of moment of inertia= 200kgm square and radius r = 3m. the disk is a rotating frictionless with angular velocity= 0.3 rad\s.find the angular velocity of the system when ...
May 1, 2012

Chem
If 20.0 L of a gas is cooled from 373 K to 273K, what is the new volume?
April 30, 2012

english
hey I'm a 9th grader and my english teacher give me a summative homework about rumors. He need us to write a problem that happen in school and also want us to answer or solve the problem about rumors.. I need help with it because I know nothing about rumors..
April 30, 2012

math
Name the point of intersection for the following system, if it exists. 4x – 3y = -3 3x – y = -6
April 30, 2012

@elena
nvm, i did it wrong. i already got the answer its 79% thanks
April 29, 2012

@elena
thank you so much help with the problem. i have trouble solving part b of the problem you helped me with. it told me to give it as a percentage, I got 10% but it is wrong. can you please help me Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car ...
April 29, 2012

college physics
i got it its 79% i was label some of the numbers with the wrong variables. tahnks and will keep that in mind
April 29, 2012

@elena Question !
for part b, what would be the percentage. i got 10% but it isnt right
April 29, 2012

college physics
Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car on the tracks. part a)If the train's mass is 3.8×10^5kg , how much force must he exert (find the magnitude)? part b)Compare to the weight of the train (give as %). partc) How much force...
April 29, 2012

uniben
do it urself
April 29, 2012

math
expand as a binomial series (r-p)^9
April 28, 2012

math
An exam consists of two parts, Section X and Section Y. There can be a maximum of 80 questions. There must be at least 20 more questions in Section Y than in Section X. Write a system of inequalities to model the number of questions in each of the two sections. Then solve the ...
April 28, 2012

math
When a person is swinging the amplitude (the swings"s distance above it's rest position) increases with each pump. According to Scientific magazine the amplitude increases by adding a constant when the person pumps sitting down, and by multiplying by a constant when ...
April 27, 2012

chemistry
(ppm and ppb are sooo not easy for me to get)c A saturated solution of PbCO3 contains 0.00011 g PbCO3 in 100. g of water. What is this concentration in parts per million?
April 26, 2012

chemistry
Most community water supplies have 0.50 ppm of chlorine added for purification. What mass of chlorine must be added to 134.0 L of water to achieve this level? anwser grams
April 26, 2012

chemistry
A sample of water is analyzed and found to contain 18.6 ppb of arsenic. If a person were to drink 2.0 L of this water per day for 1.4 years, what is the maximum amount of arsenic they could accumulate in their body? Assume that 1 year = 365 days anwser________ grams or arsenic
April 26, 2012

biology
1,Why do autotrophs always occupy the lowest level of ecological pyramids? 2.Explain how the growth of one population can bring about the disappearance of another population during succession? 3. Describe some common plants and animals from a tropical rain forest and a ...
April 26, 2012

chemistry
4NH3(g)+5O2(g) yield 4NO(g)+6H2O(g) Deduce the equilibrium constant expression for the reaction.
April 26, 2012

Chemistry
A 2.7 M solution of phosphoric acid (H3PO4) is to be reacted with a 7.5 M solution of sodium hydroxide to make sodium phosphate and water. How many L of the H3PO4 solution will react with 0.662 L of the NaOH solution
April 25, 2012

life orintation
8 ways in which the environment impacts communities
April 24, 2012

Mechanics problem - Newtons laws - resultant force
I have this mechanics problem. Please help me solve it. Rory, Aurora and Raoul are three lions fi ghting over a piece of meat of mass 12 kg. Each lion exerts a horizontal pull. Rory pulls with a force of 800 N. Aurora, who is 120degrees to Rory's right, exerts a force of ...
April 24, 2012

l.o
identify and describe one environmental proble that causes ill health,accidents,crises,and disasters within your community or any other community within south africa or globally
April 23, 2012

calculis
Find the equation of the tangent line to the curve y=e^2x + 4x at the point (0,1)
April 23, 2012

calculus
Find the equation of the tangent line to the curve y=e^2x + 4x at the point (0,1)
April 23, 2012

math
a cubical container is half filled with water if the volume of water in the container is 500cm3 find the length of one edge of container?
April 23, 2012

math
a rectangular tank has the measurement 60cm wide and 2000cm2 water flows into the tank at the rate of 8 liters per minutes how long will it take to fill the tank?
April 23, 2012

math
a rectangular swimming pool is 30m wide and 50m long if the 600m of water is added to the pool what is the increase in the height of the water level in centimeters?
April 23, 2012

math
A rectangular box is 16cm long and 10cm wide 960 1-cm cubes can fit into the box exactly what is the height of the box?
April 23, 2012

Physics
Anyone else from SF have to google this question, or was i the only one?
April 22, 2012

pre-calc helpppp
Find sin x/2, cos x/2, and tan x/2 from the given information. (show work please) thank you!!! cos x = − 4/5, 180° < x < 270°
April 21, 2012

pre-calc helpppp
thank you so much!!!!
April 21, 2012

pre-calc helpppp
Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. ã((1-cos50)/2)
April 21, 2012

pre-calc helpppp
Thank you!!!!
April 21, 2012

pre-calc helpppp
Evaluate the expression under the given conditions (show steps please) sin(è/2); tan è = − 5 / 12 , è in Quadrant IV
April 21, 2012

Chemistry!! Help
Consider the following equilibrium: N2O4 <=> 2NO2 You may assume that delta H and delta S do not vary with temperature. At what temperature will an equilibrium mixture of 1 atm total pressure contain twice as much NO2 as N2O4?
April 20, 2012

Chemistry!!!
Consider the rxn during the Haber Process: N2 + 3H2 ---> 2NH3 The equilibrium constant is 3.9 x 10^(5) at 300 K and 1.2 x 10^(-1) at 500 K. Find Delta H reaction and Delta S for reaction
April 20, 2012

MATH##$$&&^^**
4.16%
April 20, 2012

Physics
Thanks Elena your a life saver :)
April 20, 2012

Physics
A cube of ice is taken from the freezer at -8.8°C and placed in a 103 g aluminum calorimeter filled with 321 g of water at room temperature of 20°C. The final situation is observed to be all water at 15°C. What was the mass of the ice cube? Could someone please ...
April 20, 2012

math
6/8
April 19, 2012

math
The water in fish tank has evaporated so it was 5/8 inch below the level it should be they added water and the water level went up 3/4 inch did the water level end up above or below where it should be
April 19, 2012

science
Which of the following scales use the concept of absolute zero? I. C II. F III. K IV. R
April 18, 2012

science
Thermal energy is different from temperature because thermal energy depends on the _____.
April 18, 2012

science
A trash can is rolling down the street at 5 m/s. If the trash can has a mass of 23 kg, what is its momentum?
April 18, 2012

chem
Brandon throws a flying disc with a force of 8 N. If the disc has an acceleration of 4 m/s2, what is the mass of the disc?
April 18, 2012

science
Brandon throws a flying disc with a force of 8 N. If the disc has an acceleration of 4 m/s2, what is the mass of the disc?
April 18, 2012

english
thank you and for this one: Meredith is to be restored as captain.the infinitive is to be and is a noun?
April 17, 2012

english
so it is to use and it would be a adverb
April 17, 2012

english
okay and the second one is i have permission and its a adverb?
April 17, 2012

english
okay and the answer can only be a noun.adverb or adjective.
April 17, 2012

english
i have one more question what is the function of the italicized infinitive phrase ins the sentence. 1.I want to go with you to the store. 2.May I have permission to use the car tonight?
April 17, 2012

english
thank you ms.sue
April 17, 2012

english
what is the gerund phrase and the noun function of the gerund in the sentence 1.Her favorite pastime is entertaining friends.
April 17, 2012

Math
A math teacher is randomly distributing 15 rulers with centimeter labels and 10 rulers without centimeter labels. What is the probability that the first ruler she hands out will have centimeter labels and the second ruler will not have labels.
April 16, 2012

physics- help please !!1
A toy rocket moving vertically upward passes by a 2.2m -high window whose sill is 7.0m above the ground. The rocket takes 0.17s to travel the 2.2m height of the window part a) what was the launch speed of the rocker ? assume the propellant is burned very quickly at blastoff ...
April 16, 2012

physics
15.5
April 15, 2012

Chemistry 1201
Thanks so much!
April 15, 2012

Chemistry 1201
Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
April 15, 2012

Chemistry 1201
Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
April 15, 2012

Chemistry 1201
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)->CaO(s)+CO2(g) What is the mass of calcium carbonate needed to produce 53 L of carbon dioxide at STP?
April 15, 2012

Pre-Calc Help!!!!!!!!!!!!!!!!1
can someone help me please????
April 15, 2012

Calc Help!!!!!!!!!!!!!!!!1
tan(sin^-1(5/6)-cos^-1(1/5)
April 15, 2012

Math
Try 868
April 15, 2012

physics
An athlete thtrew a short put of mass7.52kg through a distance of 24m when we projected a short put at angle of 30. Assuming there is no air resistance, what is the initial kinetic energy of the athlete.
April 15, 2012

psyc355
30.9
April 15, 2012

psyc355
Children below the 30th percentile (in the bottom 30%) are in need of special assistance prior to attending school. What raw score marks the cut-off score for these children?
April 15, 2012

Chemistry!!!
What is the solubility of MnS, in grams per liter, in a buffer solution that is 0.120 M HC2H3O2 - 0.490 M NaC2H3O2? For MnS, Kspa=3x10^7.
April 13, 2012

Chemistry!!
A solution has [Al^3+]=8.0×10−2 M and [HC2H3O2]= 1.10 M. What is the maximum quantity of NaHC2H3O2 that can be added to 200.0 mL of this solution before precipitation of Al(OH)3 begins?
April 13, 2012

Accounting
At the beginning of April, Owl Corporation has a balance of $12,000 in the Retained Earnings account. During the month of April, Owl had the following external transactions. 1. Issue common stock for cash, $10,000. 2. Provide services to customers on account, $7,500. 3. ...
April 13, 2012

physics
Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.
April 13, 2012

Physics
a.) P=P initial + pgh 101,000 Pa + (1000)(9.8)(2.5) P=125500Pa. P=F/A 125500=F/50 6.3*10^6N
April 13, 2012

Chem...
1) what is the density of methane (CH4) at a temp. of 20C and a pressure of 684mm. 2) a gas has a density of 2.5g/L at a temp. of 20C and a pressure of 1.1 atm. what is its molar mass.
April 12, 2012

Math
As a fraction it is 60/100 but you probably need to simplify it so find a common factor of both, in this case the number 20, and divide both 60 and 100 by that to get the fraction of 3/5. 60% is equal to .6 because 100% equals 1.
April 12, 2012

Physics
The formula to use is c=f*lambda where c equals speed of a wave, f is frequency, and lambda is the Greek for wavelength. So to find the speed you multiply 9 by .654 and the answer should be 5.886 m/s.
April 12, 2012

math
I believe to find the sum of the exterior angles of a n-sided polygon is (n-2)*180 where n is the number of sides. So for a 50-sided polygon it should be 8640 degrees. For the interior angles it is (n-2)*180/n where again n is the number of sides.
April 12, 2012

Math
For a line to be perpendicular to another line you need to use m in the linear equation of y=mx+b and find the opposite and reciprocal of that number. In this case m is 3 so the opposite of 3 is -3 and the reciprocal is just flipping the fraction of -3/1 so it is now 1/-3. Now...
April 12, 2012

Physics
Where must an object be placed to have a magnification of 3.74 in front of a converging lens of focal length 14.1 cm? Answer in units of cm
April 12, 2012

Science
D because mechanical energy is basically kinetic energy and when that is greater than the force of gravity then it will not fall down.
April 12, 2012

Physics
Three identical small Styrofoam balls of mass 1.53 g are suspended from a fixed point by three nonconducting threads, each with a length of 56.4 cm and negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 31 cm. What is the common ...
April 12, 2012

algebra
For the area of a circle is πr² as you stated so all you do is set 400 equal to πr² and solve for r. 400=πr²/π 127.32=r² √127.32)= r r=11.3 Same thing for this except you use 800 instead of 400 so. 800=πr² 254.64=r²...
April 12, 2012

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