Thursday
August 28, 2014

Posts by Joan

Total # Posts: 181

Algebra
The vertex of a graph is (2,-2) is it a minimum, yes or no?
June 12, 2014

Pre-Calculus
Find a quadratic function f such that f(1)=3, f(2)=5/2, f(-1)=1 I came out with 3 a+b+c=3, 4a+2b+c=5/2, a-b+c=1. And I know that I should do synthetic division but I am stuck.
January 8, 2014

Sorry but i forgot to pose what subject it was.
December 16, 2013

Reiny and steve do this for me please
1. Consider the functions f(x)=1/(x)+4 and g(x)=2/(x). Graph f and g on the same grid. a) Determine the points of intersection of the two functions. b) Show where f(x)<g(x). c) Solve the equation 1/(x)+4=2(x) to check your answer to part a). d) Solve the inequality 1/(x)+4&...
December 16, 2013

chemistry calculations
when 2.750 g of the oxide of lead is heated to a high temperature,it decomposes to produce 0.0640 g of oxygen gas and 2.686 g of some new lead oxide compound.How can you use this data to determine the formula of the new compound?
December 4, 2013

Physics
Children sled down a 45 m long hill inclined at 26 degrees. At the bottom, the slope levels out. If the coefficient of friction is 0.1, how far do the children slide on the level ground?
September 23, 2013

Physics
Children sled down a 45 m long hill inclined at 26 degrees. At the bottom, the slope levels out. If the coefficient of friction is 0.1, how far do the children slide on the level ground?
September 23, 2013

English
B. Dangerous. The Dangerous equipment in the mills was unsafe for the workers, yet small children were forced to climb around and under it every day. It makes sense :) Have a great day!
September 23, 2013

English
I would say C. Outrage. Mother Jones was outraged that the owners wouldn't say anything about child labor because the mill owners controlled stock in their newspaper. Therefore, she decided to act on her outrage to get them a little publicity. Being enthusiastic would have...
September 23, 2013

science
any one who knows the answers to these questions 3 4 12 17 18 19 21
August 24, 2013

Statistics
PROBLEM 6 answer is The result is not statistically significant, so we conclude that the sons are taller than their fathers, on average.
August 10, 2013

Statistics
PROBLEM 9 The conclusion of the test is The treatment had a bad effect. is the right answer
August 10, 2013

mathematics
Hi, I'm not sure if I'm giving the correct answer for this problem. The question states; The values of computers in the years after its purchase date are listed in the following table. Year 0=1500, Year1=1200, Year2=1100,Year3 +1000, Year 4 = 800, Year 5 =400, Year 6= ...
July 9, 2013

chemisty
how many grams of sucrose must be dissolved in 1.5kg of water ot produce a solution which has a freezing point of -2.40 degrees C?
April 14, 2013

geometry
what is tan-1 3.5= to
March 26, 2013

math
find tan 30 degrees and tan 45 degrees using the 45-45-90 triangle therom and 30-60-90 triangle theorm
March 25, 2013

science
For a given area of land, the average rate of creep is 14 mm per year. How long will it take the area to move 1 m?
March 25, 2013

hs geometry
to find the height of a tree, a student 53 inches in height measures the length of the tree's shadow and the length of his own shadow. The student casts a shadow 63 inches in length and the tree casts a shadow 67 inches in length
March 17, 2013

English 102
Where do I find a Word Processor program in MLA format?
February 26, 2013

problem solving
three digit odd number divisible by 9 digits in consecutive order and digit in hundreds place is greater than the digit in the ones place?
January 28, 2013

Physics
A car is traveling at 10 m/s. By what factor does the car's kinetic energy increase if its speed is doubled to 20 m/s?
November 27, 2012

Physics
A 17kg child slides down a 2.7m -high playground slide. She starts from rest, and her speed at the bottom is 1.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?
November 27, 2012

PHYSICS 1 ..
as she pick up her riders a bus driver traverses four successive displacements represented by the expression (-6.30 b)i-(4.00 b cos 40)i-(4.00 sin 40)j+(3.00 b cos 50)i-(3.00 b sin 50)j-(5.00 b)j here b represents one city block,a convenient unit of distance of uniform size; i...
November 25, 2012

UNIVERSITY PHYSICS 1
how did u get -12.4i and 4.87j
November 24, 2012

UNIVERSITY PHYSICS 1
November 24, 2012

UNIVERSITY PHYSICS 1
November 24, 2012

UNIVERSITY PHYSICS 1
as she pick up her riders a bus driver traverses four successive displacements represented by the expression (-6.30 b)i-(4.00 b cos 40)i-(4.00 sin 40)j+(3.00 b cos 50)i-(3.00 b sin 50)j-(5.00 b)j here b represents one city block,a convenient unit of distance of uniform size; i...
November 24, 2012

PHYSICS
The cutting tool on a lathe is given two displacements, one of magnitude 4 cm and one of magnitude 3 cm, in each one of five situations (a) through (e) diagrammed in the figure below. Rank these situations according to the magnitude of the total displacement of the tool, ...
November 20, 2012

PHYSICS
while exploring a cave, a spelunker starts at the entrance and moves the following distances in a horizontal plane. she goes 75.0 m north, 250 m east, 125 m at an angle theta equal to 30.0 north of east, and 150 m south. find her resultant displacement from the cave entrance.
November 20, 2012

PHYSICS
how did you get (108.25,62.5) and (0,-150)
November 19, 2012

PHYSICS
while exploring a cave, a spelunker starts at the entrance and moves the following distances in a horizontal plane. she goes 75.o m north, 250 m east, 125 m at angle theta =30.0 north of east, and 150 m south. find her resultant displacement from the cave entrance.
November 19, 2012

Physics
Air molecules create an upward force that impacts the free fall of objects on the surface of the Earth, differing form the way an object would fall in vacuum. Question: What kind of objects should be used for experimentation if we want to limit the impact on our experimental ...
September 16, 2012

physics
A car accelerates from 10.0 m/s to 30 m/s at a rate of 3.5 m/s2. How far does it travel while accelerating?
August 26, 2012

Learning
i think D
August 7, 2012

chemistry question on fats
for ground beef i got 62.5% of fat and 11.44 (cost/pound of fat free meat) for frank i got 46. 2% 11.13(cost/pound of fat free meat) for salami 73.5 % 61.38 (cost/pound of fat free meat) for balaoni 22.58% 12.89 cost
August 6, 2012

chemistry question on fats
Materials and Equipment Water Inlet Water Outlet Extraction Thimble Cooling Cell Flask Siphon Cup Procedure Obtain a Whiley extractor unit (see Figure next page) from the stockroom and a sample of bologna, salami hamburger or frankfurter meat from your instructor. Note the ...
August 6, 2012

chemistry question on fats
. This experiment separates meat into an acetone-soluble part and an acetone-insoluble part. The calculations are based on the principal components of meat being fat (acetone soluble) and protein (acetone insoluble or fat-free meat in report sheet). More realistically, the ...
August 6, 2012

chem lab question
for ground beef i got 62.5% of fat and 11.44 (cost/pound of fat free meat) for frank i got 46. 2% 11.13(cost/pound of fat free meat) for salami 73.5 % 61.38 (cost/pound of fat free meat) for balaoni 22.58% 12.89 cost
August 6, 2012

chem lab question
is this what you wanted?
August 6, 2012

chem lab question
Materials and Equipment Water Inlet Water Outlet Extraction Thimble Cooling Cell Flask Siphon Cup Procedure Obtain a Whiley extractor unit (see Figure next page) from the stockroom and a sample of bologna, salami hamburger or frankfurter meat from your instructor. Note the ...
August 6, 2012

chem lab question
1. This experiment separates meat into an acetone-soluble part and an acetone-insoluble part. The calculations are based on the principal components of meat being fat (acetone soluble) and protein (acetone insoluble or fat-free meat in report sheet). More realistically, the ...
August 6, 2012

world history
Describe how Reconstruction was brought to an end by white terror and the Compromise of 1877. Had the process of Reconstruction been effective? Why, or why not?
August 3, 2012

coding
What is the difference between ICD-9-CM codes and MS-DRGs?
May 19, 2012

Science
An astronaut is walking in space and his jetpack runs out of fuel. How can he use his empty pack to get back to the space station?
May 8, 2012

math
solve for x 4(2x-1)= 2x+35
April 27, 2012

health
How can is the importance of health documentation on patient services can affect reimbursement ?
April 15, 2012

Italy
What are some famous restaurants and hotels in Italy? Could you tell me more about their history?
March 19, 2012

trig
when sin theta+cos theta=square root of 2,find the solution of sin^3 theta+cos^3 theta
March 17, 2012

Chemistry
I meant 0.85% and 0.70% ...sorry
February 15, 2012

Chemistry
How much distilled water must be added to .85% solution Of NaCL to make a 70% solution of NaCl
February 15, 2012

physics
How much heat is required in order to change 5 g of ice at -15 degree to steam at 150 degree?
February 7, 2012

physics
A 20 g sample of aluminum at 85 degree is dropped in 500g of water. The resulting temperature of aluminum and water is 25 degree. What is the initial temperature of water?
February 7, 2012

physics
A uniform steel chain 20 m long and with a mass of 5 kg per m, hangs vertically. Compute the work required to wind it up
January 24, 2012

physics
a 400 kg crate is to be lifted a height of 20 m in 30 s. Compute the work done and the power consumed in lifting the crate
January 24, 2012

trigonometry
From the top of a hill 700 ft high an observer notes that the angles of depression of two successive markerstones on a level ground, which leads straight away from the hill are 5 degree and 15 degree respectively. Find the distance between the two markerstones.
January 18, 2012

Finance
listing the different sources of short-term financing. Discuss the characteristics of each source and explain why a company might choose one over the other.
November 17, 2011

chemistry
3. The solubility of BaSO4 at 25C is 9.04 mg/L. Based on this, how many grams and moles of BaSO4 remained dissolved in the 100 mL of solution? What percent of your yield does this represent?
October 23, 2011

help science
which has moroe bouyancy when dpped in water ? iron ? aluminiom ?
September 28, 2011

social studies
who is meant by stupa ?
September 28, 2011

science
what is mixed cropping ?
September 28, 2011

maths
how to prove sss conguence ?
September 28, 2011

english
how to write article review ?
September 28, 2011

chemistry
What is the maximum mass of H2 formed, when 0.380 g of aluminum are reacted with 55.0 mL of 8.00 M HCl? The other product is AlCl3
September 26, 2011

chemistry
Europium has two stable isotopes, 151 Eu (150.9198 u) and 153 Eu (152.9212 u). The atomic mass given for Eu is 151.9640 u. What is the percent abundance of 153 Eu ??
September 26, 2011

chemistry
use given to get gfw. 36/.1503= {the 36 if from C=1283 and 15.03 comes from % given} then equals to 239.5gfw (gfw) * (% unknown){unknown 100-15.03} so, 239.5 * .8497 = 203.5 then divide by 4 because of the X4 = 50.875 about 50.9 V-Vanadium. Answer: V4C3. is this correct ?????
September 26, 2011

chemistry
The compound X4C3 contains 15.03% carbon. What is the chemical symbol for X ?
September 26, 2011

chemistry
Europium has two stable isotopes, 151 Eu (150.9198 u) and 153 Eu (152.9212 u). The atomic mass given for Eu is 151.9640 u. What is the percent abundance of 153 Eu ??
September 21, 2011

chemistry
7.25 g of iron were reacted with sulfur until the product reached a constant mass of 13.50 g. If the experimental molecular mass of the product was measured as 572 u, what is the molecular formula of the product? What is the actual molecular mass of the product?
September 21, 2011

chemistry
7.25 g of iron were reacted with sulfur until the product reached a constant mass of 13.50 g. If the experimental molecular mass of the product was measured as 572 u, what is the molecular formula of the product? What is the actual molecular mass of the product?
September 21, 2011

chemistry
What is the maximum mass of H2 formed, when 0.380 g of aluminum are reacted with 55.0 mL of 8.00 M HCl? The other product is AlCl3
September 21, 2011

chemistry
8750 g of a compound which contains only carbon, hydrogen, and nitrogen were burned in oxygen to produce, 2.1930 g of N2O4 , and 2.2900 g of water. What is the empirical formula of the compound? (Hint: do carbon by difference)
September 21, 2011

chemistry
The compound X4C3 contains 15.03% carbon. What is the chemical symbol for X ?
September 21, 2011

chemistry
Write the balanced equation for the combustion of C2H5(NH2)CO2H . The nitrogen is converted to N2O4
September 21, 2011

chemistry
How many grams of Al(NO3)3 are needed to prepare 25.0 mL of a 0.750 M aqueous solution.
September 21, 2011

Calculus (Urgent!!)
Hello everyone, I need help with the following problems. Find the partial derivative of the following: 1) f(X1, X2) = X1^1/2*X2^3/4 2) f(x1,x2,x3) = ln(x1)x2 + 3x3 3) f(x,y) = 3x + 4y 4) f(x,y) = x^1/2 +x/y + y/x Find the maximum of the following function: 1) f(x1,x2) = 5x1 - ...
September 1, 2011

Physics
A bomb free of outside forces is traveling north when it explodes into exactly three pieces. (Ignore any gas molecules from the explosion that go off in miscellaneous directions.) One piece continues to travel north, while another moves straight up relative to the ground. It ...
July 5, 2011

literary
What is the term in literature that describes a story that appeals to kids and adults, but for different reasons. E.g. the original batman series.
July 1, 2011

chemistry
water and ammonia have different molar heats of vaporization. the best interpretation at the molecular level is that water molecules
May 30, 2011

physics
A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16 × 1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.21 × 1014 Hz. Calculate the speed at which the galaxy is receding ...
May 18, 2011

Physics doppler effect
A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the approaching whistle is 523 Hz, and drops to 491 Hz after the ...
May 16, 2011

Physics doppler effect
A radar device emits microwaves with a frequency of 4.73E+9 Hz. When the waves are reflected from a van moving directly away from the emitter, the beat frequency between the source wave and the reflected wave is 751 beats per second. What is the speed of the van? (Note: ...
May 16, 2011

physics
John is listening to a horn. He knows the frequency of the horn is 300 Hz when both he and the horn are at rest. If he hears a pitch of 330 Hz, there are clearly several possibilities. For each of the following statements, indicate whether it is correct or incorrect. Both can ...
May 16, 2011

Management
What are the differences between threats and opportunities in a business organization? Give two examples of each one in detail.
May 16, 2011

Physics
A simple pendulum suspended in a rocket ship has a period To. Assume that the rocket ship is near the earth in a uniform gravitational field. Determine for each of the following statements whether it is correct or incorrect. If the length of the pendulum is doubled, the new ...
May 4, 2011

physics
A massless spring with spring constant 16.7 N/m hangs vertically. A body of mass 0.220 kg is attached to its free end and then released. Assume that the spring was unstretched before the body was released. How far below the initial position does the body descend? please show ...
May 4, 2011

physics
The figure below represents a periodic wave. Each increment on the equilibrium line is 760 cm. What is the wavelength for this wave (in m)?If the wave in the figure above has a frequency of 60 Hz, what is the wave's speed?
May 2, 2011

physics
A pendulum consists of a mass m = 0.12 kg hanging from a flexible string of length L. The string is very thin, very light, and does not stretch. It makes small oscillations, with a period of 0.663 s. What is the oscillation frequency of the pendulum? What would the period of ...
April 29, 2011

Probabilility/Statistics
You have \$5000 to invest. Two options: (1) 67% chance of making a return of \$1000 or getting nothing. (2) 50% chance of making \$300 and 50% mking \$700?
April 25, 2011

calculus
The function f is continuous on the closed interval [0,2] and has values that are given in the table below x = 0| 1 | 2 ____________ f(x) = 1| k | 2 The equation f(x) = 1/2 must have at least two solutions in the interval [0,2] if K = ? The answer is 0, but there is also a ...
April 20, 2011

Stats
With normal approximation method and technology, is it necessary to use the one sample z test for proportion for large sample sizes instead of the binomial formula?
April 1, 2011

chem!
i cant figure this one out! :( a balloonist is preparing a trip in a helium balloon. the trip begins in early morning at a temp of 15 degrees Celcius. By mid afternoon, the temp has increased to 30 degrees C. assuming the pressure remains constant at 1.00 atm, for each mole of...
March 21, 2011

chemistry
a balloonist is preparing a trip in a helium balloon. the trip begins in early morning at a temp of 15 degrees Celcius. By mid afternoon, the temp has increased to 30 degrees C. assuming the pressure remains constant at 1.00 atm, for each mole of helium, calculate: 1. the ...
March 20, 2011

Physics
What current would flow in an ordinary 115 V household circuit, if a 1430 W hair drier and a 1000 W microwave oven were operating simultaneously on this line?How much current would the hair drier and microwave from the previous question draw, if they were connected to the 115 ...
March 13, 2011

Physics
Three resistors (14.4 Ω, 21.7 Ω, 14.1 Ω) are connected in parallel across 98 V. What is the total resistance for this circuit? What is the voltage drop across the 21.7 Ω resistor? What current is flowing in the 14.1 Ω resistor? What is the total ...
March 13, 2011

Physics
An electrical motor is designed to operate on 34 V at 1.3 A. How much resistance must be connected in series to this motor, if you wish to plug it in to a 120 V outlet?
March 13, 2011

math
3. Suppose a ladder is 12 ft. long. The base of the ladder is 5 ft. from a wall, and the top of the ladder is leaning against the wall. How far above the ground is the tip of the ladder?
March 8, 2011

math
i'm not sure what a 1/5 is of 200. or 3/4
January 26, 2011

math
ivested \$1,500 in the stock market on january 1, she lost 1/3 of it by the end of january and 2/5 of the remaininbg amount by the end of february. how nmuch did she have left?
January 26, 2011

science
what unknow liquid with a density of 10g/mi and volume of 10 mi what is the object mass
January 19, 2011

Physics
Two objects collide and bounce off one another. After the collision, object m1 = 1.67 kg moves off at 14.5 m/s at a heading of 327 degrees. Object m2 = 1.66 kg moves off at 8.9 m/s at a heading of 211 degrees. Initially, m2 was traveling at 11.8 m/s at a heading of 318 degrees...
January 16, 2011

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