Questions Asked on
May 12, 2012

CHEMISTRY
A mixture of Xe, Kr, and Ar has a total pressure of 6.7 atm. What is the mole fraction of Kr if the partial pressures of XE and Ar are 1.6 atm and 2.8 atm? Did anyone get .343 ?
asked by John 
chemistry
write the steps of complete ionization of carbonic acid and hydro sulfuric acid.
asked by ryan 
statistics
a company manufactures batteries in batches of 18 and there is a 3% defect rate. Find the standard deviation for a number of defects per batch?
asked by tara 
functions
a car is spinning at a rate of 4.3pi radians/s. how many rotations will it make in an hour?
asked by kerry 
Chemistry
For the reaction below, Kp = 1.16 at 800.°C. CaCO3(s) CaO(s) + CO2(g) If a 25.0g sample of CaCO3 is put into a 10.2L container and heated to 800.°C, what percent of the CaCO3 will react to reach equilibrium?
asked by Andrew 
Physics
A cannon fires a projectile into the air at an angle of 60degrees above the horizontal. The projectile falls back on the ground at a distance d from the cannon and its maximum height is h. Ratio d/h is equal to:
asked by Zess 
CHEMISTRY
A Sample of gas originally at 25 degrees C and 1 atm pressure in a 2.5 L container is allowed to expand until the pressure is .85 atm and the temperature is 15 degrees C. What is the final volume of gas? Did anyone get 2.6 L
asked by John 
Compound interest
Hello My teacher skipped over this and I have no clue how to do this or the equations. Help would be wonderful thank you If 6000 dollars is invested in a bank account at an interest rate of 10 per cent per year, find the amount in the bank after 15 years
asked by someone 
statistics
8. Compare the mean for the heights of males and the mean for the heights of females in these data. Compare the values and explain what can be concluded based on the numbers. Comparing the mean of height between male and female shows that the average
asked by jeanne 
chemsitry
the ph of a .030M C2H5 COOH solution is 3.20. What is this acids Ka?
asked by ryan 
business
What keys or tips can raise suspicion about the validity of arguments, presented verbally and in writing? Not sure if I understand correctly...
asked by twg 
Math
A rectangular solid has a base area of 43.3 sq inches and a height of 50 inches a triangular prism has a base in the shape of an equilateral triangle and a height of 50 inches. the volumes for both shapes are equal. find the side of the equilateral
asked by Joshua 
Please Help:D
Given a square, what is the locus of points equidistant from the sides?
asked by My Name Is Bob 
Calculus!
Which is the standard form of the equation with p = 26, O=3pi/4 ? the O before the =3pi has a diagonal slash through it.
asked by kelsey 
Math
If the larger of two numbers is divided by the smaller, the quotient and the remainder are 2 each. If 5 times the smaller number is divided by the larger, the quotient and the remainder are still 2 each. find the two numbers.
asked by Arshia 
Information Literacy
1When choosing your search strategy for a search engine, it's best to A. enter the least important word first. B. ignore alternate spellings. C. combine keywords into phrases by using quotation marks. D. use verbs, articles, and capitals My answer C 2 To
asked by Moha 
Math
Score Percentile Score Percentile Score Percentile Score Percentile 3.5 0.02 1 15.87 0 50 1.1 86.43 3 0.13 0.95 17.11 0.05 51.99 1.2 88.49 2.9 0.19 0.9 18.41 0.1 53.98 1.3 90.32 2.8 0.26 0.85 19.77 0.15 55.96 1.4 91.92 2.7 0.35 0.8 21.19 0.2
asked by Need Help!!! 
CHEMISTRY
If 33.7 ml of 0.210 M KOH is required to completely neutralize 27.0 ml of a HC2H3O2 solution, what is the molarity of the acetic acid solution? HC2H3O2(aq)+ KOH(aq)>KC2H3O2(aq)+H2O(l)
asked by Michael 
Math
I need help atleast an equation to get started please A lab assisstant wants to make five liters of 27.8% acid solution. If solutions of 50% and 13% are in stock, how many liters of each must be mixed to prepare the solution.
asked by Janine 
Information Literacy
1To determine the best place to begin your online research, you should first A. identify keywords and search terms. B. formulate your research question. C. choose several verbs and modifiers to help define your search. D. settle on a single, concise
asked by Moha 
Science please help!
A lamp connected to a battery lights up. If a second, identical lamp is connected to the battery in parallel, the current drawn from the battery will _____ , and compared to the original brightness of the first lamp, both lamps will be _____ . will the
asked by matthew 
accounting
1.On December 15, 2012, Pascal declared a cash dividend of $2.00 per share to stockholders of record on December 31. The dividend is payable on January 15, 2013. Pascal has issued 1,000,000 shares of common stock, of which 50,000 shares are held in
asked by ashley 
Life orientation
How smoking is a human factor tha may cause ill health,accidents,crises or disaster?
asked by Tsakani 
math
The number of bacteria in a culture is modeled by n(t)=1710e071t (a) The initial number of bacteria is (b) The relative rate of growth of this bacterium population is (c) The number of bacteria after 3 hours is (d) After how many hours will the number of
asked by someone 
Math 8th Grade
I would greatly appreciate it if someone would please be kind enough to take the time and show me how to work these problems. Thank you very much Solve by finding y and graph using the slope and yintercept: 3xy=1(My answer y=3x+1)which is wrong could
asked by Please help me 
Algebra 2
How would I find the sum of the geometric series given? 1/5  1/25 + 1/125
asked by Greg 
chemistry
write a balanced chemical equation for the dissociation of solid magnesium hydroxide in water?
asked by ryan 
Information Leteracy
1) which of the folowing is true regarding doing an online search for information A if your serch turns up no hits,you need to use a more specific keyword B you'll get better result if you choose a single, general keyword C Using one or two specific
asked by Bita 
math
A box with no top is to be constructed from a piece of cardboard whose width measures x cm and whose length measures 6 cm more than its width. The box is to be formed by cutting squares that measure 2 cm on each side from the four corners, and then folding
asked by amanda 
us history
Which was not one of the causes of the Great Depression? (Points : 5) excessive income taxes speculative stock purchases risky banking practices severe drought
asked by ahmed 
CHEMISTRY
Is CF4 an example of a central atom with an expanded octet?
asked by John 
math
For this problem my equation is Y=70+110e^kt but i keep getting it wrong any suggestions? A roasted turkey is taken from an oven when its temperature has reached 185 Fahrenheit and is placed on a table in a room where the temperature is 75 Fahrenheit. (a)
asked by someone 
ALG 2 (exponents)
Write log'2' 8 = 3 in exponential form?
asked by Greg 
Math
For this problem my equation is Y=70+110e^kt but i keep getting it wrong any suggestions? A roasted turkey is taken from an oven when its temperature has reached 185 Fahrenheit and is placed on a table in a room where the temperature is 75 Fahrenheit. (a)
asked by someone 
Math
he number of bacteria in a culture is modeled by n(t)=1710e071t (a) The initial number of bacteria is (b) The relative rate of growth of this bacterium population is (c) The number of bacteria after 3 hours is (d) After how many hours will the number of
asked by someone 
Math
The cars in a car service use a total of gallons of gasoline per week. If each of the cars uses the same amount of gasoline, then, at this rate, which of the following represents the number of gallons used by 5 of the cars in 2 weeks? A. 10CG B. 2G/5C C.
asked by John 
math problem
Bacteria grow in a nutrient solution at a rate proportional to the amount present. Initially, there are 250 strands of the bacteria in the solution which grows to 800 strands after seven hours. Find the time needed for the bacteria to grow to 1600 strands.
asked by gwapa 
Physics
a charged particle is in point (2, 3, 8) and has a charge Q1 = 5x1010C. Another particle is at (5,7,0) and has a charge Q2 = 3x1010C. Calculate how much work needed to move the first particle to the point (0, 7.2) using the electric field
asked by Filip 
Physics
Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?
asked by Tanner 
CHEMISTRY
CaC2 (s) + 2 H20 (g) > Ca(OH)2 (s) + C2H2 (g) The complete reaction of 22.7 g of CaC2 requires consumption of ________g of H2O. I did 22.7 g CaC2* (2/64 mols CaC2) = .709 Right?!?!
asked by John 
11TH Geometry
With the image of O(2,1) after 2 reflections. one across the line y=5 and line x=1
asked by Megan 
solid mensuration
If a match box has inside dimensions of 2 in. by 1 ¼ in. by 5/8 in., find the useful capacity of the box. The cover is made with open ends so that the box can slide into it, the fit being snug. If the match box and cover are made of thin slices of wood
asked by xzknij 
precalculus algebra
Diane is a manager at a small movie theater. On Wednesday, she sold twenty adult and children’s tickets. Adult tickets are $3 each. Children’s tickets are $2 each. On Wednesday, the theater made $125 from ticket sales. How many adult tickets were sold?
asked by amy 
math
The Pythagorean Theorem gives the relationship between the sides of a right triangle. The following identities show the relationships between the trigonometric functions of a particular angle. sin2 θ + cos2 θ = 1 tan2 θ + 1 = sec2 θ 1 + cot2 θ = csc2
asked by rick 
science
if i use 30 ul from a total volume of 600ul to get 40ug/ml. So to get the total ug only, do i take 40ug/ml*.030ml*(600ul/30ul)=total ug
asked by eng 
sciencebiology
can anyone help me by finding which enzymes are present in carbohydrates? is it salivary amylase(tyalin)
asked by sandra 
solid mensuration
the area of the total surface of a polyhedron weighing 64 lb. is 340 sq. in. what is the surface of a similar polyhedron made of the same material and weighing 1000 lb. ? thank you!!
asked by sara 
English
Hello. I will really appreciate some help. 1)Do you think it's possible and natural to use "unsuccessfully" in the following position: "They have been trying to solve the problem in the new project, but unsuccessfully"? 2)Do you think the article is a must
asked by Ilma 
managerial economics
Some of the fields have large enough quantities of both oil and natural gas that coordination must achieved for the production of both rather than oil alone as in our examples. Will fields with both oil and gas have greater difficulties in unitization than
asked by tip 
physics
i need three project topics in physics. Help please
asked by Joanna 
algbra 1b
can someone tell me if i have the answer correct a. Suppose a market research company finds that at a price of p = $40, they would sell x = 27 tiles each month. If they lower the price to p = $15, then more people would purchase the tile, and they can
asked by nell 
Soanish8th grade Help!
I'm trying to conjugate this in the past tense tú/presentarse would I conjugate it in past tense like this (tú te presentaste) Something looks wrong with it
asked by Jake 
Art and Writing Therapist
I just have a few questions. Ok so the main point of being a Art/Writing Therapist is ...... when you talk to teenagers, children or adults about their problems in their life and you help them by writing and create art like for example when a regular
asked by Laruen 
CHEMISTRY
Determine the pressure in atm for a 10 g of CO2 sample contained in a sealed 10 L tank at 50degrees C? Did anyone get 26.5 atm?
asked by John 
CHEMISTRYHELP
The electronegativities of the elements are H=2.1, O=3.5, F=4.0, S=2.5, Cl=3.0. Determine (calculate) the electronegativity diffrences for the following molecules and explain how they are arranged in the order: H2, O2, HCl, HF, H2O and position them in the
asked by Bran 
solid mensuration
104. A fly stationed at a point on the circumference of the base of a cylindrical tower of radius 12 ft. finds that he can just see a distance flagstaff by walking along the tangent line to the base either a distance 8 ft. in one direction or a distance 5
asked by apolonio 
chemistry
how do you write the ionization reaction and the acid ionization constant expression for the third ionization of phosphoric acid in water? Can you explain the main concepts that are involved in this?
asked by ryan 
English  ms. sue
ms sue i trying to find a movie, song that i compare with rosemary. i not know what movie character enter in as ray of hope and show them light in movie.
asked by Mohammad 
Math
first three terms of a geometric sequence are the same as the 1st, 9th and 11th terms of an arithmetic sequence, respectively. What is the common ratio in the geometric sequence ? Thanks!
asked by Matthew 
Writing
I need to write and essay answering this question but I cant find a good article. Please help. "What responsibilities does the individual play in selecting food choices? Should the individual in turn bear the full expense that the health care industry
asked by Jeury 
math
the printed matter on a 18 by 22 centimeter page of a book must cover 96 square centimeters.If all margins are to be the same width, how wide should they be?
asked by amanda 
MATH
Solve by finding y and graph using the slope and yintercept: 3xy=1 xy=3 3x8=y Use the pointslope form of an equation to write the following in slope intercept form: m= 3 point: (4,2) m= 3/8 point: (3,5)
asked by Please Please Help 
math
the arc length and central angle of a circle are 10cm and 80degrees respectivly. what is the length of the radius?
asked by celina 
algebra
using product rule, power rule, negative rule using scientific notation. 5.4*10^6/2.7*10^4=5.4/2.7*10^6/10^4=2*10^2
asked by plz help 
physics
A 2630kg car drives up a hill 769 meters high in 41.0 seconds. Calculate the power exerted
asked by Matt 
Health
Writeacher, could you please check if everything is OK? Thank you very much. 1) My classmates always keep me from work (from the lesson??). I was on the phone with the bank when we were cut off. 2) I was so cross with my boss that I hung up on him.Peter
asked by Mike 
factoring math
factor 16sin^2a+81
asked by sasha 
Health
Could you please check if these questions are all possible? Thank you, Writeacher. 1)Focus on the first Hanoverians and answer briefly the following questions. What were the first political parties in Britain, where did they descend from and who sided with
asked by Mike 
Chemistry
Na (s) + 1/2F2 (g) = 2NaF (s) Are the reactants at higher or lower energy than the products and is the reaction endothermic or exothermic? I feel that the reaction is exothermic, but can't determine higher or lower enery?
asked by Bran 
Chemistry
The electronegativities of the elements are H=2.1, O=3.5, F=4.0, S=2.5, Cl=3.0. Determine (calculate) the electronegativity diffrences for the following molecules and explain how they are arranged in the order: H2, O2, HCl, HF, H2O and position them in the
asked by Bran 
Probability
In a raffle there are four winning tickets from 12, What is the probability from six tickets there are two winners? Thank you in advance.
asked by William 
Information Literacy
which of the following is true regarding doing online search for information
asked by moha 
chemistry
2 questions please: The highest positive oxidation number that chlorine can exhibit an any compound is +7, whereas its most negative oxidation number is 1. Write the electron configuration of chlorine and explain why these are limiting oxidation numbers
asked by Derrick 
Information Literacy
which of the following is true regarding doing online search for information A. If your search turns up no hits, you need to use a more specific keyword B. You'll get better results if you choose a single, general keyword . C. Using one or two specific key
asked by Moha 
English
Hello. I'll be very grateful if you help me with a few questions. 1)Would you use the article in the context: "he became (the?)French president", "he became (the?) president of France"? 2)Which preposition is correct in the following context: "England
asked by Ilma 
CHEMISTRY
A Sample of gas originally at 25 degrees C and 1 atm pressure in a 2.5 L container is allowed to expand until the pressure is .85 atm and the temperature is 15 degrees C. What is the final volume of gas? Did anyone get 2.6 L
asked by John 
CHEMISTRY
Are these listed in the correct order of increasing average molecular speed? NH3
asked by John 
CHEMISTRY!
Pure copper has a density of 8.933 g/cm^3. What is the volume of a 5 g block of copper? I did D=M/v Flipped the formula to V=M/D V= 5g/8.933 (g/cm^3) so that equals .56 cm^3 Right?!?
asked by John 
math(geometry)
find the altitude on hypotenuse if a=6cm and b=8cm?
asked by Hoema 
algebra
evaluate the expression. Assume h does not equal 0 h^o=
asked by plz help 
chemistry
write a balanced equation for the reaction between sulfuric acid and calcium metal
asked by ryan 
chemistry
how do you identify the base in this reaction? h2o(L) + CH3NH2(aq) yields OH(aq) + CH3+(aq)
asked by ryan 
chemistry
what is the base ionization constant expression for ammonia?
asked by ryan 
science
if i use 30 ul from a total volume of 600ul to get 40ug/ml. So to get the total ug only, do i take 40ug/ml*.030ml*(600ul/30ul)=total ug
asked by eng 
algebra
evaluate the expression. Assume h does not equal 0 h^0=
asked by plz help 
Math
Bob takes 45 minutes each day for lunch. He does not get paid for the lunch break. How many hours does he work in a 5day workweek if he checks in at 8:00 a.m. and checks out at 5:15 p.m. each day?
asked by Mike 
adv functions
a pie is cut into 8 equel slices. if a person wants 0.75(pie sign) centimetre of crust, about how many pieces should they take?
asked by chris 
MATH
which two points of a trignometric function will always give an average rate of change of 0?
asked by shab 
math
If a^x=b^y=c^z and b^2=ac then find value of y.
asked by Shobhit 
solid mensuration? help.
Window glass formerly was made by gathering a lump of molten glass on the end of a hollow rod blowing it into the form of a large hollow cylinder about 6 ft. long and 1 1/2 ft. in diameter. This was cut longitudinally and then placed in an oven and heated
asked by sara 
solid geometry...
find the area of the earth's surface within the Arctic Circle; that is, in latitude north 66° 32' N. thank you! :D
asked by sara 
Chemistry
If 9.03 x 1021 molecules of a compound having general formula CnH2n+2 weigh 1.71g, what is the molar mass of the compound? Give its molecular formula
asked by Susan 
Science!
Always forms virtual images at the same distance behind the optic as the object is in front of it. I thought it was concave but im not sure if concave lens form a virtual images when its infront of the optic
asked by matthew 
math
a pie is cut into 8 equel slices. if a person wants 0.75(pie sign) centimetre of crust, about how many pieces should they take?
asked by chris 
french
i need a sentence for controle
asked by jessie 
Technology
Design the defining diagram, hierarchy chart and the algorithm that will determine the percentage sales commission earned on loyalty customers' purchases from a customer file.
asked by Devi 
economics
Movie attendance dropped 8 percent as tick prices rose a little more than 5 percent. What is the price elasticity of demand for movie tickets? Could price elasticity be somewhat overestimated from these figures? That is, could other things have changed,
asked by Ashaki 
Algerbra
Multiply 7/5 * (6/7)
asked by Sue 
algebra
solve 9< 4x  4< 3
asked by Sue 
HELPCHEMISTRY!
Na (s) + 1/2F2 (g) = 2NaF (s) Are the reactants at higher or lower energy than the products and is the reaction endothermic or exothermic? I feel that the reaction is exothermic, but can't determine higher or lower enery?
asked by Bran 
English
What punctuation is correct for this sentence? Comma or SemiColon? But these weren’t simply mashed; they were formed delicately by my mother’s hands But these weren’t simply mashed, they were formed delicately by my mother’s hands
asked by Teddy 
solid mensuration
103. A billiard ball, aimed at a point A on the edge of the cushion of a horizontal billiard table, rolls along a line making 18 degrees with the cushion. If the cushion over hangs so that its edge is 4 cm. above the table and the diameter of the ball is 5
asked by apolonio 
math
Hello, I'm having a hard time fingering our this question. Not really sure what formula to use. Thanks in advance! For a five year period, Ned deposited $800 each quarter into an account paying 5.6% annual interest compounded quarterly. (a) How much money
asked by lynn 
poems
does anyone know a poem about seashores and it has to be aroung grade 6 level thank u?
asked by smiley 
math
The probability that a votingage adult in 2004 voted in the presidential election was 0.57. Five votingage adults in 2004 were randomly selected. Find the probability that exactly 2 or the 5 adults voted in the presidential election.
asked by Timothy 
child care management
A teaching method that uses computers to help children learn is called ?
asked by jennifer 
Algebra 2
Simplify: (8x^8 y^27) ^1/3 I need a little help learning how to work this problem out
asked by GREG B. 
statistics
A group meeting is attended by 16 delegates. (a)If a 6person negotiation panel is selected at random from the 16 delegates, what is the probability the negotiation panel consists of 3 delegates from Atlantis and 3 delegates from Zedonia?
asked by matt 
Statistics
In 1972, there were 3.4 trillion cigarettes purchased worldwide, and in 1984, there were 4.3 trillion cigarettes purchased worldwide(in trillions) in the year x, where x=0 represents the year 1972. (a) Which of the following linear equations could be used
asked by Kwame 
track and field
is a speed of 6.5 on a tredmill for five minutes equal to a good mark for a seventh grade girl to get 67 seconds in the 4 by 400?
asked by Kennedy 
RR
simply (r^6)^5 (r^6)^5=
asked by plz help 
statistics
suppose the replacement times for washing machines are normally distributed with mean 8.6 years and standard devistion of 1.6years. a. what percentage of washing machines have replacement times less than 7 years? b. find the probability that a washing
asked by tara 
algebra
simply. Assume m,n=0 (5m^4n^2)^3
asked by plz help 
algebra
evaluate 176A^2 when A=9 176A^2=
asked by plz help 
math
calculate 10^1.27 how do i do this?
asked by hannah 
algebra
evaluate a^4when a= 2 a^4=
asked by plz help 
algebra
express using a positive exponent 1/k^w 1/k^w=
asked by plz help 
algebra
multiply and simpify y^4*y^6*y^7=
asked by plz help 
algebra
divide and simplifyr r^7/r^3= divide and write expression using positivr exponent.
asked by plz help 
algebra
what's the simplied form of (5m^4n^2)^3
asked by plz help 
algebra
write the following using a positive exponent, simplify the expression and simplify6^2. write using a positive exponent. do not evaluate
asked by plz help 
math
a/51/5=6
asked by amanda 
math
3x+8 over 5 + 7/5= 7x over 4
asked by amanda 
math
using the product rule: 5.4*10^6/2.7*10^4=5.4/2.7*10^6/10^4=2*10^2 solve plz.
asked by plz help 
english language arts
hii! so is this sentence a metaphor or a hyberbole? The cloud was a thick blanket of ashes. thanks!
asked by Anonymous 
Health
At the dining halls I work out all employees must wear hats or hairnets and gloves at all times no exceptions! At all the restaurants I have ever eaten at I have never seen waiters or waitresses wear gloves or hairnets/hats ever! I feel as if this a huge
asked by Dylan