Questions Asked on
October 15, 2010

calculus 1
Please help !!!!! Find dy/dx by implicit differentiation. (sin πx + cos πy)4 = 65
asked by john 
math
about 7/10 of u.s. population in 1991 saying a to be true. What was the total popuation?
asked by lauren 
math
If 6x  3y= 30 and 4x= 2y then find x+y.
asked by tea 
Chemistry
You have a stock solution of 13.4 M NH3. How many milliliters of this solution should you dilute to make 100.0 mL of 0.100 M NH3
asked by Nancy 
Math
If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, it height in feet after t second is given by y=95t–16t2. Find the average velocity for the time period beginning when t=2 and lasting i) 0.1 seconds ii) 0.01 seconds
asked by Jennifer 
Probability  CHECK ANSWERS
I have an eight pack of crayons. Colors red, green, blue, orange, black, gray, pink, and purple. What is the probability of choosing the green crayon? 12.5 percent What is the probability of choosing the red, blue, or gray crayon? 37.5 percent What is the
asked by Jessica 
calculus
Find the linearization of the function below at x = π y=sin(x)/x Your answer should be a linear function of x where the coefficients are accurate to at least two decimal places. Don't understand this problem. please help..
asked by aneri 
General Chemistry
How much heat is absorbed by a 25.0g sample of gold at 25.0 degrees celcius when it is immersed in boiling water?
asked by Saw 
Biology
Are there any viruses/diseases in the tundra?
asked by Andy 
maths
In a test there were 25 multiplechoice questions. They were marked as follows: 2 marks for each correct answer 0 marks for a nonattempt 1 mark for an incorrect answer. Sarah attempted 4 5 of the questions and received 22 marks. How many questions did
asked by Jannie 
5th grade
mat ran 1/5 mile less on monday then on tuesday. he ran 1/2 mile less on wednesday than he did on monday. he ran 7/10 mile more on friday than on wednesday. if matt ran 4/5 mile on friday, how far did he run on tuesday?
asked by amira 
math
what is the mean for 22,22, 23, 25,25,26,26,26,39
asked by camille 
algebra 2
suppose you are enclosing a rectangular area to create a rabbit cage. you have 80 ft of fence and want to build a pen with the largest possible area for your rabbit, so you build the cage using an existing building as one side. make a table showing the
asked by jenny 
statistics
A company manufactures calculators in batches of 64 and there is a 5% rate of defects. What is the standard deviation for the number of defects per batch?
asked by Rebecca 
french
kindly make 7 sentences with the verb ".HABITER". THANKS.....IAM A 4TH GRADE STUDENT.
asked by mimi 
Calculus
Find the derivative of y=(2x²+x)²°°.
asked by Janey 
statistics
A company manufactures calculators in batches of 64 and there is a 5% rate of defects. What is the standard deviation for the number of defects per batch?
asked by Rebecca 
statistics
A basketball player has a 76% chance of making a free throw. What is the probability of her making 104 or more free throws in 119 trials? Round your standard normal variable to two decimal places before using the table of values.
asked by br0Ok3 
prob and stats
A coin is weighted so that the probability of obtaining a head in a single toss is 0.37. If the coin is tossed 27 times, find the following probabilities. Round your standard normal variable to two decimal places before using the table of values. (Give
asked by br0Ok3 
prob and stats
The scores on an Economics examination are normally distributed with a mean of 77 and a standard deviation of 18. If the instructor assigns a grade of A to 16% of the class, what is the lowest score a student may have and still obtain an A? (Give your
asked by br0Ok3 
prob and stats
The tread lives of the Super Titan radial tires under normal driving conditions are normally distributed with a mean of 34000 mi and a standard deviation of 1700 mi. (a) What is the probability that a tire selected at random will have a tread life of more
asked by br0Ok3 
prob and stats
–/3 points Notes Question: TanColM7 8.6.003. TKK Products manufactures electric light bulbs in the 50, 60, 75, and 100watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 774 hr and standard
asked by br0Ok3 
statistics
–/3 points Notes Question: TanColM7 8.6.003. TKK Products manufactures electric light bulbs in the 50, 60, 75, and 100watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 774 hr and standard
asked by br0Ok3 
north america
san francisco, california, a country or a city?
asked by cath 
AP Human Geography
identify when the 3 peaks of immigration occures
asked by Anonymous 
Chemistry
How many atoms of element "R" are present in 55.80 g of (AH3)4(R2O3)4 (molar mass = 478.17 g/mol)? Please help. I've tried going (g of molecule/mol)x(1 mol of molecule/ 55.80g)but I'm not really sure what to do with this.
asked by Kathryn 
calculus
Integrate x^2+5x+1dx/(2x^3+15x^2+6x+23)^1/2
asked by Frank 
math
Find the representation of the number 256 in thefollowing bases:a. Base six b. Base twelvec. Base two
asked by Anonymous 
MBA
2. Given a firmï¿½s demand function, P = 24  0.5Q and the average cost function, AC = Q2 ï¿½ 8Q + 36 + 3/Q, calculate the level of output Q which a) maximizes total revenue b) maximizes profits
asked by kanwal 
physics
As some molten metal splashes, one droplet flies off to the east with initial speed vi at angle θi above the horizontal, and another droplet flies off to the west with the same speed at the same angle above the horizontal, as inthe figure. In terms of vi
asked by natalie 
8th grade
Ryan left musuem and drove south. Gab left 3 hrs later driving 42 km/h to catch up to him. After 2 hrs gab finally caught up. find Ryan's averae speed?
asked by nancy 
COM 220
I am needing to write an outline on Immigration in the United States. Here is my thesis " While immigration has positive results to the U.S., illegal immigration laws must be enforced to reduce the negative impavt of costs and the admittance of legal
asked by P 
algebra
Graph 2y3x>4
asked by Jonathan 
english
10 simple sentences about my pet(dog)
asked by amy 
physics
A horizontal spring, resting on a frictionless tabletop, is stretched 14 from its unstretched configuration and a 1.00 mass is attached to it. The system is released from rest. A fraction of a second later, the spring finds itself compressed 3.6 from its
asked by J 
chemistry
i need someone to explain this to me as im doing a lab next week... for determining the calorimeter constant using a simple calorimeter how would one calcualte the calorie constant? i knw theres an equation involving the warm water and hot water ect ect
asked by Crickett 
college
A bag contains a mixture of copper and lead BBs. the Average density of the BBs is 9.50g/cm^3. Assuming that the copper and lead are pure determine the relative amounts of each kind of BB
asked by inny 
CHEMISTRY
At 63.5 degreesC, the vapour pressure of H2O is 23.3kPa and that of ethanol is 53.3kPa. A solution is made by mixing egual masses of H2O and C2H5OH. a. what is the mole fraction of ethanol in the solution? b. assuming idealsolution behaviour, what is the
asked by lulu78 
CHEMISTRY boiling point
0.1m aqueous solution of HCl and 0.1m aqueous solution of C6H12O6. calculate the boiling point of each i know the eq. dTb=Kbm but i have no temperatures. this is the question
asked by lulu78 
Chemistry
How do I calculate the solution of Ag(NO3)in Ca(NO3)2?
asked by Zoshk 
Maths
Person A has more than $200 than Person B. Each week, Person A receives $50 meanwhile Person B receives $65. When will A and B have the same amount of money?
asked by Babiibun 
Maths
N and M have annual savings of $15.00 and $20.00 respectively. When did they have the same saving amount? If N and M started his job in 2000 and 2002 namely.
asked by Babiibun 
IGNOU probability
Among the examinees in an examination 30%, 35% and 45% failed in Statistics, in Mathematics, and in at least one of the subjects respectively. An examinee is selected at random. Find the probabilities that a. He failed in Mathematics only b. He passed in
asked by Dharmenra 
prealgebra
What is the area of a rectangle measuring 1/3 meter by 1/5 meter. Express answer in units squared [meters2]
asked by Robin 
biology
Why do we tend to assume that natural chemicals are safe while industrial chemicals are evil? Is this correct?
asked by Anonymous 
math
Find the range, median, and mode of each set of data and write the question along with the answers in your Math notebook and submit on 13,October 2010. A. 20, 12, 6, 17, 4, and 19 B. 13, 2, 17, 18, and 5 C. 16, 16, 4, 4, 23, 21, and 21 D. 13, 14, 15, 14,
asked by sabrina 
business
why has U.S. currency increased now? and euro currency decreased? PLEASE HELP ME I HAVE A TEST !!!
asked by Sabrina 
English
Thank you for your last corrections. Here are some more sentences I'm not sure of. I included the alternatives. 1) I get angry with my brother when he behaves differently from what I expect him to (OR: differently than I expect, differently from expected).
asked by Franco 
methods of researh
you are conducting research on sex diffrences in emails.Your hypothesis is that men use more declarative statements and women use more questions. what are the advantags and disadvantages using the archival method in psychology and methods of research
asked by diane 
J&W
identify the vertex of the parabola y=4x240x+96
asked by Johnny 
Chemistry
In a simple titration experiment how and why are the results reproducible?
asked by Paul 
Science
I have my results from a simple titration experiment (sodium carbonate against hydrochloric acid) Average titre of 53.27 cm3 which i am happy with but how can i reason that my results are accurate?
asked by Charlie 
new physics
a man leaves his house for 2 hours. after walking in a straight line for two hours he is 10 miles from home. calculate the man's average speed in terms of miles per hour.
asked by eliska ware 
college English
Also, had they of done research on wills and added fact based information, than this would have made a crucial impact. Is the writing after "Also" a restritive or nonrestrictive phrase? I think that what is after "also" is restrictive but what is after the
asked by Anonymous 
physics
the mathematical relationship between velocity (v) and time (t) for a coin tossed up into the air after it leaves the thrower¡¦s hand at t = 0 with a velocity of +15.0 m/s. Assume that the positive direction is upward and the acceleration of the coin is
asked by abe 
spanish2
what is the correct verb form of yo, tu, and ustedes?
asked by pandora 
8th grade, science
What recources would be required for establishing a colony in space.
asked by unknown 
Geography/History
Incidents of Basque violence are caused by their desire for _____. 1) educational opportunities 2) improved health care 3) increased wages 4) independence I think it is 4. I just want to know if I am right. help?
asked by Katy 
caculus 1, please help
Find d2y/dx2 in terms of x and y. y5 = x6
asked by Matt 
calculus
Find d2y/dx2 in terms of x and y. y5 = x6
asked by Matt 
chemistry
the general chemical form of salicylic acid
asked by Ziyada 
english
_____ wrote humorous tales about the Gold Rush. Guy de Maupassant Frank R. Stockton Mark Twain
asked by Anonymous 
Geography/History
Multiple select. The dissolution of the Union of Soviet Socialist Republics _____. 1) had no effect on the United States 2) affected nations throughout the world 3) reduced the number of Communist nations in the world 4) increased the number of Communist
asked by Katy 
english
Every paragraph in a critique should _____. focus on an aspect of the theme mention the protagonist be centered around one main idea
asked by mike hawk 
english
what is a critic?
asked by danny g 
History/Geography
Essay question: Choose an article reporting on a site where a conflict is likely to occur in the future. Summarize the article and discuss what role, if any, culture will play in the situation. How am I supposed to write about something that MIGHT happen
asked by Kaitlin 
English
Should fact based be hyphnated?
asked by Anonymous 
math
clue#1 You will use exactly eleven baseten blocks. Clue#2 The number is less than 300. Clue#3 The digit in the tens place is one less than the digit in the ones place. Who am I? Mom of second grader, can't help her with this!! Can you explain how to
asked by Nancy 
9th grade
Use the distributive property to simplify: 25(2x + 1/5).
asked by TIM 
Physics
Two archers shoot arrows in the same direction from the same place with the same initial speeds, but at different angles. One shoots at 45.0degrees above the horizontal, while the other shoots at 60.0 degrees.If the arrow launched at 45.0 lands 225 from
asked by Kara 
English 2
(From A Separate Peace) 9. Finny's behavior in the snowball fight suggests that his life is a. one long struggle b. based on disorder and unpredictability c. governed by strong loyalties d. marked by a basic dishonesty B? Or C..not sure Thanks MC
asked by mysterychicken 
algebra
Find the perimeter of a rectangle if the given base is (x5)m, and the height is (6x+7)m.
asked by Jaja 
Modern (Abstract) Algebra
Let f:A>B, where A and B are nonempty Prove that f(S1  f(S2) is a proper subset of f(S1 S2) fo all subsets S1 and S2 of A. Give an example where there are subsets S1 and S2 of A such that f(S1)  f(S2) does not equal f(S1S2)
asked by dreww1961 
chemistry
What element has 20 protons and forms a +2 Cation?
asked by Samantha 
phi 445
diversity may not be as good with less representation in foreign countries. American companies may not want to go into another country if the benefit of cheaper business costs weren't there. How do you think this would effect us?
asked by meshelle 
Modern (Abstract) Algebra
Let f:A>B, where A and B are nonempty Prove that f(S1  f(S2) is a proper subset of f(S1 S2) fo all subsets S1 and S2 of A. Give an example where there are subsets S1 and S2 of A such that f(S1)  f(S2) does not equal f(S1S2)
asked by dreww1961 
math
You can use the prime factorization of a number, written as the product of powers of prime numbers, to find the number of factors the number has. First, express the number as a product of powers of prime numbers; for example, 36=2^2 3^2 (that is 2 squared
asked by m 
Physics
The compass in a plane indicates that the plane is heading due east, with an airspeed of 250 km/h (Vpa). A steady wind is blowing with a magnitude of 75km/h, which increases the velocity of the plane, relative to the ground. If the plane is going along a
asked by Jon 
Physics
A physics book slides off a horizontal tabletop with a speed of 1.10m/s . It strikes the floor in 0.350s . Ignore air resistance. The height of the tabletop above th floor is .600m.The horizontal distance from the edge of the table to the point where the
asked by Kara 
Math check
Factor each expression: x^2144/x+4 times x^216/x+12 This is what I got: (x+12)(x12)/x+4 times (x8)(x+2)/x+12 How is the answer x^216x+48
asked by Heather 
Math
How do you factor x^2
asked by Heather 
Math Check
2x^25x3/3x^25x2 times 2x^2+11x+5/x^2+3x10 this is what I have: (x3)(2x+1)/(x2)(3x+1) times (2x+1)(x+5)/(x2)(x+5) How is the answer x3/3x+1
asked by Heather 
algebra
the sum of the four angle measures of any convex quadrilateral is 360 degrees. if a certain convex quadrilater has angle measures of 60, 2y10, and 10y+5 degrees, what is an expression for the degrees measure of the fourth angle?
asked by ashley 
Composition
Which topic do you think would be easier to research for an argument essay? Deforestation or Recycling?
asked by Elizabeth 
phi 445
What are the principles behind the ethics of care?
asked by meshelle 
Calculus
Find the equation of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2 = 25(x^2y^2) at the point ( 3 , 1 )
asked by Kevin 
work
b)5 men can do equal amount of work as 8 women. If 3 men and 5 women combinely do job in 10 days, then how many woman required to finish it in 14 days?
asked by Anonymous 
trig
given cosine (2/5) and pie
asked by Hey 
English
I'm in 7th grade and I'm doing a lesson plan for the book because of winndixie. For the final project I'm going to have students create a diorama that represents the primary or secondary themes in the book. From an adults perspective What do you think the
asked by Monica 
child development
how to help depressed mothers and babies
asked by denny 
calculus
Find the derivative of y=(s^3+12)^(1/6)
asked by jordyn 
physics 111
A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 10.0 N force directed 25.0° below the horizontal. 1) what's the work done by the applied force? in joules 2)whats the work done by the normal force exerted by the
asked by blake 
Physics
A 20.0 kg crate is pushed across a rough floor for a distance of 90.0 cm. When the force pushing the block is equal to 80.0 N and applied at an angle of 18.0 below horizontal to the block, the block moves at a constant speed of 2.10 m/s.
asked by Diana 
Physical Education
Help I need a mnemonic to remeber the following words Family Peers Role Model Fashion Media Cost Status Disability Age Race Gender Availability Location Access Time Illness Health Problems
asked by Moira 
Physics
A 20.0 kg crate is pushed across a rough floor for a distance of 90.0 cm. When the force pushing the block is equal to 80.0 N and applied at an angle of 18.0 below horizontal to the block, the block moves at a constant speed of 2.10 m/s. What is the net
asked by Diana 
elementary math
show that 1,078 and 3,315 are relatively prime
asked by Anonymous 
statistics
how do you get thesampling and confidence intervals for this problem sample scores of 1,2,3,4,5 and 95 percent confidence interval about the sample mean
asked by Inez 
finance
A small chemicalcompany is negotiatimg a loan from Manhatten Bank and Trust. The small chemical company needs to borrow $500,000. The bank offers a rate of 8 1/4 % with a 20% compensating balance, or as an alternative 9 3/4% with additional fees of $5,500
asked by vanessa 
Physics
A physics book slides off a horizontal tabletop with a speed of 1.10m/s . It strikes the floor in 0.350s . Ignore air resistance. The height of the tabletop above th floor is .600m.The horizontal distance from the edge of the table to the point where the
asked by Sam 
Physics
A cable passes over a pulley. Because of friction, the tension in the cable is not eh same on opposite side of the pulley. The force in one side is 110 N, and the force on the other side is 100 N. Assume that the pulley is a uniform disk of mass 2.1kg and
asked by Rod 
geometry
AB is 9cm and AC is 19cm calculate the lenght of BC if the angle is a 90 degress
asked by tia 
maths
a car uses 25 litres of petrol to travel 200 miles. how many litres of petrol will the car use to travel 450 miles?
asked by tia 
math
write down the value of (4xy) degress
asked by tia 
math
expand and simplify 4(3k2)+3(4k)
asked by tia 
math
mr jones buys a new car for $50,000. the car decreases in value at the rate of 30% each year. find the value of the car after two years.
asked by tia 
English
I am writing an essay and looking for some other ways to say however, therefore, and in conclusion. Thanks!!
asked by Kayla 
chemistry
Which one of the gollowing represents the theoretical yield, in grams, of precipitate for the double displacement reaction if 25.0 mL of 1.75 M aqueous calcium nitrate is added to 15.0 mL of 1.50 M sodium phosphate?
asked by Tammy 
math
Calculate the lower quartile (QL) in the following data set: (8, 6, 13, 8, 3, 15, 12, 5).
asked by patrick 
calculus
The tangent line to the graph of y = h(x) at the point (6, 9) passes through the point (6, 2). Find the following values. (a) h(6) (b)h '(6)
asked by Sophie 
Chemistry
A mixture of gases collected over water at 14C has a total pressure of 1.198 atm and occupies 72 mL. How many grams of water escaped into the vapor phase?
asked by Megan 
Calulus
Consider the following function. f(t) = 3t2 − 3 (a) Find the average rate of change of the function below over the interval [3, 3.1]. (b) Compare this average rate of change with the instantaneous rates of change at the endpoints of the interval. (at t =
asked by Sophie 
Calculus
Find the derivative by the limit process. 6/√(8x)
asked by Sophie 
Chemistry
What will be the final temperature if 2000g of copper at 95 degrees loses 10 kcal of heat?
asked by Ray 
Chemistry
What will be the final temperature if 2000g of copper at 95 degrees loses 10 kcal of heat?
asked by Kelly 
algebra
the sum of three numbers is 60. One number is ten more than a second number. It is also twice the third. Find the numbers. The three numbers are
asked by Anonymous 
calculus
Find the derivative by the limit process. 6/√(8x)
asked by Nina 
Chem
Aviation fuel is significantly more expensive per gallon than diesel fuel. Why then is aviation fuel still used in Planes?
asked by Nathalie 
statistics
Starting with the data values 70 and 100, add three data values to the sample so that the mean is 96, the median is 97, and the mode is 97
asked by Becky 
physics
If a proton is accelerated from rest through a potential difference of 1500 V, find its final velocity. proton mass = 1.67 x10−27 kg
asked by angela 
Chemistry Help
If it takes three "breaths" to blow up a balloon to 1.2 L, and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 L balloon? i am trying to use v1/n1=v2/n2 but i am stuck, can u help? thank you
asked by Samuel 
health
why is it important to consider the components of the social ecology framework in community and public health?
asked by davon 
math
total profit made by McDonald’s in 2002.
asked by Angie 
physics
boy pulls a toy cart of mass 2 kg with a force of 3 N at an angle of 60° with respect to the horizontal road. What is the acceleration produced by the cart?
asked by kimberly 
Psychology
A decription of the central themes and stratigies ofpositive Psychology
asked by Mea 
statistics
suppose you have a set of blood pressures with a mean of 80 diastolic, and standard deviation of 5 points. assuming a normal distribution of blood pressures what two values should 95% of all blood pressures lie? please show all calculations. thank you very
asked by please help in panic modemary 
statistics
Sat scores l around the nation tend to have a mean score around 500, a standard deviation of about 100 points and are approximately normal distributions. a person who scores 600 on the sat 1 has approximately what percentile rank within the population?
asked by please help in panic modemary 
physics
What dominant mode of heat transport exchanges heat from food in the refrigerator to the cooling coils?
asked by jim 
physics
Consider three layers of a wall. The first layer is plaster 1.0 cm thick (R = 0.033 SI units), the second layer is fiberglass insulation 8.9 cm thick (R = 2.97), and the outside layer is wood 3.0 cm thick (R = 0.33). What is the heat loss through one
asked by jim 
physics
The natural greenhouse effect raises the surface temperature at the surface of the Earth by about 20 or 40 k?
asked by jim 
physics
Since the industrial revolution, the Earth's average surface temperature has Answer a. risen about 1 K. b. has risen about 3 K. c. has risen about 5 K d. Has not changed significantly.
asked by jim 
physics
Doing work on a gas always implies Answer a. adding internal energy. b. adding heat. c. changing the volume. d. adding potential.
asked by jim 
physics
If 250 moles of gas are compressed to 0.75 of an original volume at a constant temperature or 295 K, how much heat must have gone into the environment? Answer a. 176 kJ. b. 205 kJ. c. 112 kJ. d. 122 kJ.
asked by jim 
physics
If we apply 300 kJ of heat to 2500 moles of air at constant pressure, what is the change in internal energy? Answer a. 214 kJ. b. 100 kJ. c. 180 kJ. d. 75 kJ.
asked by jim 
English
Can you please check if the following corrections are OK? Thank you very much for helping me. 1) I think my socks bring luck. 2) Italian teenagers like wearing large dark shades (better: sunglasses), designer clothes and baseball caps with a peak (and
asked by Franco 
physics
In a fully random distribution, we can determine the most probable state from what two quantities? Answer a. The number of particles and the net momentum. b. The number of particles and the total energy. c. The net momentum and the total energy. d. the
asked by jim 
physics
How is entropy calculated in the general case? Answer a. By determining the amount of heat absorbed. b. By multiplying P times Î”V and summing over small increments. c. By summing over momenta and positions. d. By summing over probabilities of
asked by jim 
physics
0.5 mol of salt (NaCl) is dissolved in 4.5 mol of water. What is the increase in entropy? Answer a. 13.5 J/K b. 84 J/K. c. 9.8 J/K. d. 2500 J/K.
asked by jim 
physics
Why is there a minus sign in the formula Î”p/Î”t = âˆ’Î”EP/Î”s? Answer a. Objects are accelerated to higher kinetic energy. b. Objects seek zero motion. c. Objects are accelerated toward higher potential. d. Objects are accelerated away
asked by jim 
Chem
What is the volume occupied by 24.4 g of argon gas at a pressure of 1.31 atm and a temperature of 464 K? n=24.4g P=1.31atm T=464 Find V i tried working it out and i got 7091.98 and is inncorrect can i get some help?
asked by Amy 
physics
What does the concentration of field lines represent? Answer a. The direction that a positive test charge will be pushed. b. The direction that a negative test charge will be pushed. c. The strength of the force on a positive test charge. d. The strength
asked by jim 
physics
What does the concentration of field lines represent? Answer a. The direction that a positive test charge will be pushed. b. The direction that a negative test charge will be pushed. c. The strength of the force on a positive test charge. d. The strength
asked by jim 
physics
What is the quantum particle of the electric field? Answer a. The proton. b. The electron. c. The photon. d. The neutron.
asked by jim 
Physics
A certain force made a 5.0 kg mass accelerate at 4.0 m/s^2. This same force made another object accelerate at only 0.8 m/s^2. Find the mass of the second object. I have no idea how to do this. Do i use m=1/a? What do i do?
asked by Emily 
Math
in the sieve of Eratosthenes for numbers less than 100, explain why after we cross our the multiples of 2 3 5 and 7 the remaining numbers are primes.
asked by Emmy 
Physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless
asked by Jordan 
HS Physics
Please help...I know the direction is up, but I can't figure out the magnitude, except that its label is kg · m/s, I think. A 0.400kg ball is dropped from rest at a point 1.80 m above the floor. The ball rebounds straight upward to a height of 0.730 m.
asked by Tzana 
Physics
A toboggan (with a mass of 15.0 kg) is being pulled by two people who are each holding their own rope, horizontally with an angle 35 degrees off the direction of travel. They are each pulling with a force of 40.0 N, against a friction force of 20.0 N. a)
asked by Britney 
chem
Name each of the following ionic compounds containing a polyatomic ion. (Type your answer using the format copper(II) chloride for CuCl2.) 1. NaNO3 can u explain? thanks
asked by sara 
physics
A horizontal force of 20 N acted on a 10 kg mass at rest. The force accelerated the mass over a rough surface so that the mass had a speed of 6.0 m/s after 5.0 seconds. How much friction was acting on the mass?
asked by Liz 
Calculus
If 12x − 52 ≤ f(x) ≤ x2 + 4x − 36 determine lim x→ 4 f(x) = What theorem did you use to arrive at your answer?
asked by Trevor 
Math
1. Look at the two monomials below. 9u3v2w4 15u4v4w3 What is the least common multiple (LCM) of the monomials shown above? 3u3v2w3 45u4v4w4 45u3v2w3 3u4v4w4
asked by Michelle 
Math
I'm doing proportions, and I'm kinda confused with this one problem.. x/3=1/5. the way I do proportions is by cross multiplying, so I get 3=5x? I don't know what my answer would be?
asked by anthony 
Chem
A heliox deepsea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium. What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.0 atm? This is a new chapter were covering and i have no idea how to do
asked by marsha 
calculus
If f(1) > 0 and f(3) < 0, then there exists a number c between 1 and 3 such that f(c) = 0. Is this true or false? Please and thank you
asked by sara 
chem
Name each of the following ionic compounds containing a polyatomic ion. (Type your answer using the format copper(II) chloride for CuCl2.) 1.Sn(SO4)2 thanks
asked by sara 
physics
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a
asked by Sarah 
Math
What does it mean by: Show that the "value of 3x^26x+5" cannot be less than 1. ?
asked by Emily 
Help me please with physics
A 25kg mass is on a level, rough surface where the force of friction is a constant 15 N. A horizontal applied force of 65 N acts on the mass. The mass is initially at rest. a) what speed does the mass have after 4.0 seconds? b) what speed does the mass
asked by Nicole 
math
A theater has 850 seats, 60% of which are in orchestra. How many seats are not in the orchestra?
asked by tasha 
jessie
hi im doing a post lab sheet for chem class. and im having a little trouble. we did an experiment where we put a mixture into a bath and checked to see how long a color would leave from the mixture. i have temperature 12.6 C > 285.6 K Time 816 sec but im
asked by chem 
Chemistry
Please read to the bottom  This help was wonderful and absolutely correct, I'm asking a bit more regarding the same question, please read below. Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe
asked by Dexter 
CHEM
Could you please tell me if these are right? Write an equation for the following reactions. Write the correct formulas of the reactants and products. Then correctly balance each equation. A.) Potassium and oxygen gas react to form potassium oxide. I got
asked by Chris 
Chemistry
Please read to the bottom  This help was wonderful and absolutely correct, I'm asking a bit more regarding the same question, please read below. Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe
asked by Dexter 
Economics
Which government bodies influence national fiscal policies that potentially affect the housing market?
asked by Bill 
chemistry
How will the relative number of moles of Mg and O be affected if the following procedural errors are made? Briefly explain (1) the crubile is not brought to constatn mass before the Mg is added. (2) water is not added after the first heating of Mg, and the
asked by mariex3 
mathmath
A study conducted by the Metro Housing Agency in a midwestern city revealed the information below concerning the age distribution of renters in the city. (Round your answers to four decimal places.) Age Adult Population, % Group Who Are Renters, % 2144 53
asked by jack 
social studies
can some one help me with the concept of agentification. beacause I had write a paper about the tax aministration which had to become a tax authority. but I had to use the theory of agentification
asked by sie 
Organic Chem
Classify each as a lewis acid or lewis base... A)H20 B)O2 C)Cu2+ D)SO3 E)AlCl3
asked by Adam 
Chemistry
An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons? a. 1 b. 2 c. 3 d. 4 I really don't get this because I thought energy levels went like 2, 8, 18, 32, and 50,
asked by timmy123 
ap chemistry
what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.
asked by brian 
physics
A 11.0 box is released on a 37 incline and accelerates down the incline at 0.25 .What is the coefficient of kinetic friction?
asked by Anne 
Physics
A football is thrown with an initial upward velocity component of 15.0m/s and a horizontal velocity component of 18.0m/s . How high does it get above the ground? How much time after it is thrown does it take to return to its original height? How far has
asked by Sam 
physics
A flatbed truck is carrying a heavy crate. The coefficient of static friction between the crate and the bed of the truck is 0.66.What is the maximum rate at which the driver can decelerate and still avoid having the crate slide against the cab of the
asked by Anne 
physics
A carton lies on a plane tilted at an angle theta 29 degrees to the horizontal, with a friction of uk .12.If the carton starts from rest 7.90 up the plane from its base, what will be the carton's speed when it reaches the bottom of the incline?
asked by Anne 
Chemistry
zink and sulfur Express your answer as a chemical formula. I entered Zn+2,S2 and it said this to me There is an error in your submission. Make sure you have formatted it properly.
asked by Lisa 
Physics
A 20kg box rests on a rough floor. It takes a horizontal force of 40 N to keep the box sliding at a steady speed. Suppose a force of 100 N is applied to the box. What speed would thr box have after sliding for 3.0m?
asked by Nita 
ap chemistry
i am having trouble writing the half reactions and the balanced equation for the galvanic cell Ag(s) AgI(s)  I−(aq)  Cl−(aq) AgCl(s) Ag(s)
asked by brian 
college
A newly discovered planet is found to have a circular orbit, with a radius equal to 11 times the radius of Earth's orbit. How long does this planet take to complete one orbit around the Sun?
asked by vera 
physics
a 1200kg car is moving at a steady speed of 25 m/s down a level road. The engine is exerting a steady force of 800N. What is the force of resistance the motor is overcoming?
asked by Leanda 
Food
Main mineral supplied by dairy products?
asked by Anna 
Food
main nutrient suppkied by meat and alternatives is carbohydrates?
asked by Anna 
American History
public opinion is ordinarily used in reference to the whole society. this perspective is
asked by Anonymous 
physics
For my question about the carton's speed must I do each step you laid out or just the last one? I got the wrong answer. Thanks for your help.
asked by Anne 
physics
a soccer player kicks a stationary ball giving it a speed of 20m/s at an angle of 15degrees to the horizontal. what is the maximum height reached by the ball?
asked by ruby 
physics
A 11.0 box is released on a 37 incline and accelerates down the incline at 0.25 .What is the coefficient of kinetic friction in units uk? What is the friction force impeding its motion in N?
asked by Anne 
physics30sh
a 1000 kg car engine exerts a force of 3000 N while the car accelerates from 20 m/s to 30 m/s is 5.0 seconds. How much force of resistance does the car experience?
asked by Michael 
physics
Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21. What is the minimum value of the coefficient of static friction that will keep the snow from sliding down in
asked by Anne 
physics
Part B Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21. As the snow begins to melt, the coefficient of static friction decreases and the snow eventually
asked by Anne 
physics
Part C Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21 degrees. If the edge of the roof is 11.0 above ground, what is the speed of the snow when it hits the
asked by Anne 
Us History
In a well developed paragraph respond to the following. After reading about yellow journalism, explain how the media may or may not influence American foreign policy? Basically, what affect can the media have on the government’s decisions? Be sure to
asked by Sammi 
physics
calculate the force on an airplane which has acquired a net charge of 180 C and moves with the speed of 180 m/s perpendicular to the earth's magnetic field 5.0 x 10^5 T.
asked by Anonymous 
Organic chem
Classify each as a lewis acid or lewis base... A)H20 B)O2 C)Cu2+ D)SO3 E)AlCl3 Lewis acids are electron pair acceptors. Lewis bases are electron pair donors. Look at H2O, for example. .. H:O: .. H This molecule has no "holes" to accept an electron. Would
asked by Adam 
physics
The tension at which a fishing line snaps is commonly called the line's "strength." What minimum strength is needed for a line that is to stop a salmon of weight 85 N in 9.0 cm if the fish is initially drifting at 2.5 m/s? Assume a constant deceleration
asked by Anonymous 
physics
For the question about friction force impeding motion. I'm sorry I tried what you wrote and did not get the correct answer. Its' not your fault. I am doing university phys and have never taken it before. I am little confused about what to do. Could you put
asked by Anne 
Business
Communist Prison Camp In such prisons the total regimen, consisting of physical privation, prolonged interrogation total isolation from former relationships and sources of information, detailed regimentation of all daily activities, and deliberate
asked by Rob 
calculus
If f is continuous on [1, 1] and f(1) = 4 and f(1) = 3, then there exists a number r such that r < 1 and f(r) = π. Can this be true or false? Please and thank you
asked by sara 
calculus
If f has domain [0, infinity) and has no horizontal asymptotes, then lim_(x>infinity) f(x) = infinity or lim_(x>infinity) f(x) = infinity. Can someone please clarify whether this statement is true or false? Thank you
asked by Tersa 
calculus
Can someone please help explain these two questions for me. For the first one my guess is that it is infinity and for the second question it would be at 0. Find the limit. lim_(x>infinity) (x^(3)  2x + 3)/(4  5 x^(2)) Locate the discontinuities of the
asked by Tersa 
U.S. Government
I need help answering the following in paragraph form. Which one of these two philosophies do you think the Supreme Court should follow: judicial activism or judicial restraint. I just need help figuring out where to go when answering. Thank you.
asked by Susie 
English
Wolunteering at an orphanage. I have worked at an orphanage. There were a lot of work to do. I talked with children there and helped them with math. I taught them English, too. I was happy because I could help others. (Would you check the passage above?)
asked by rfvv 
English ErR
Please check it Shaharzad is very brave and daring woman. She put her life on the death line to prove her point. Everyone has courage to do some thing better with their own selves. but it require ton of nerve and dare to do better for some one else .But
asked by mujahid 
English
Working at a nursing home. I have volunteered at a nursing home. There were some work to do. I talked and listened to elderly people. I also cleaned the rooms at the nursing home. I was glad because I could help elderly people. (Would you like to check the
asked by rfvv 
English
1. She will wear a dress to the party. 2. She will wear a dress at the party. (Which preposition is right?)
asked by rfvv 
CHEMISTRY
Dr BOB can you explain this to me. I am so struggling with this subject. NO one has helped me on this one yet can anyone help me? during a typical breathing cycle the CO2 concentration in the expired air rises to a peak of 4.6% by volume. Calculate the
asked by lulu78 
physics
My answer for this question A 11.0 kg box is released on a 37 degreesincline and accelerates down the incline at 0.25 m/s^2. What is the coefficient of kinetic friction? My answer was 68.2 and it was incorrect.
asked by Anne 
CHEMISTRY
Lysozmyne is an enzyme that breks bacterial cell walls. A solution containing 0.150g of this enzyme in 210ml of solution has an osmotic pressure of 0.217kPa at 25*C. What is the molar mass of Lysozmyne? I cant find the chemical formula anywhere. I have
asked by lulu78 
Chemistry
Write a formula for the ionic compound that forms between each of the following pairs of elements. 1. aluminum and oxygen Express your answer as a chemical formula. AlO and Al2O3 and Al2O3 the 2 was the bottom right cornor and I got this message Use
asked by Lisa 
English
Can someone please help to come up with a thesis statment for the "Great Gatsby" i wanna talk about alluring apperience and Gatsby's quest for the american dream
asked by rainy 
ap chemistry
would the half reactions for Ag(s) AgCl(s) Cl−(aq)  Cl−(aq) Hg2Cl2(s) Hg(§¤)be Ag+Cl+e==> AgCl 2Cl+3Hg==>Hg2Cl2+Hg+e
asked by brian 
chemistry
10.0 mg of a certain protein were dissolved in water to make a solution of 3.50 mL at 28.0o C. If the osmotic pressure is 1.30 torr, what is the molar mass of the protein?
asked by lizz 
matn
x=33 The solution is x=
asked by wendy 
Math (surveying)
I am having a really hard time figuring this problem out. I need to see how it is worked. THANKS!
asked by Kasey 
Physics
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 ×
asked by Max 
HCA 230
describe different coping and support strategies for dealing with stress related medical issues. Include the following strategies action facilitating support and nurturing support. I just need to figure out what are some stress related medical issues??
asked by mari 
Physics
Onefourth of length L is hanging down over the edge of a frictionless, table. The rope has an uniform, linear density (mass per unit length), lambda, and the end already on the table is held by a person. a) How much work does the person do when she pulls
asked by Leshawn 
chemistry
Write a balanced chemical reaction to show the dissociation of solid magnesium chloride (MgCl2) in water, indicate states of the reactants and products
asked by Jessica 
chemistry
write a balanced chemical reaction for the reaction of aqueous magnesium chloride with aqueous potassium phosphate to form solid magnesium phosphate (Mg3(PO4)2) and aqueous potassium chloride (KCl). Indicate the physical states of the reactants and
asked by Jessica 
Mathematics
If 45 = 2/5 what is 1/5?
asked by MARIANNE 
Quantitative Literacy  MAT106 VG
Pick four cities and divide them into pairs. Use the Internet to find the length of the circle between the first pair of cities. You might try using the site Great Circle Mapper or a similar Web site to help you. Estimate the great circle path between
asked by TANYA 
Math
What does it mean 2x is divisible by 6? that 2x can be divided by 6. so 6 / 2x
asked by Amy 
surveying math
I need help with this problem and I need to show my work. Can anyone help me? A vertical angle of 40 is recorded between A and B. The slope distance, after meteorological corrections, is 806.388 m. What is the horizontal distance between A and B?
asked by Kasey 
math
a patrol boat took 2.5 hours for a round trip 12km upriver and 12km back. the speed of the current was 2 km/h. what was the speed of the boat in still water? ps: i just need to know how to make equations from the question above. it's supposed to create
asked by lawrence 
Physics
A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 15.5 m long. The bowler hears the sound of the ball hitting the pins 2.50 s after the ball is released from his hands. What is the speed of the ball? The speed of sound
asked by Lynmarie 
Economics
Question 3: Suppose an individual has the following utility over consumption: u(x) = x 1 2 . The individual currently earns $2,500 per month, which is spent to finance consumption. Suppose the individual is ofered a job with a new internet company. The new
asked by dhanani 
English
1. The old lady moved me. 2. I was moved by the old lady. (#1 is an active voice sentence. Right? #2 is the passive form of#1? Am I right? Do you use the active form frequently?)
asked by rfvv 
Chemistry
Nitric acid is a component of acid rain that forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid. Write a balanced chemical equation for this reaction. Express your answer as a chemical
asked by Lisa 
Calculus ll  Arc Length/Simpson's Rule
Use Simpson's Rule with n=10 to estimate the arc length of the curve. Compare your answer with the value of the integral produced by your calculator. x = y + y^(1/2), 1 ≤ y ≤2
asked by Morgan 
statistics
sat scores around the nation tend to have a mean score around 500, a standard deviation of about 100 points and are approximately normal distribution. a person who scores 600 on the sat has approximately what percentile rank within the population. show all
asked by please help in panic modemary 
implicit diffirentation
y4 + xy = x3 – x + 84 (a) Find dy/dx at the two points on the graph with xcoordinate 0. Hint: Set x=0 in the equation and solve for y to find the two points.
asked by pav