Sunday
September 21, 2014

Posts by D


Total # Posts: 290

grade 9 science
a student wants to estimate the population size and density of birch trees in a woodlot measuring 100 m by 100 m. On a diagram of the woodlot, she splits the area into a 10 by 10 grid and randomly selects 10 sample quadrants - (0,0), (1,4), (2,6), (3,9), (4,3), (5,5), (6,1), (...
September 10, 2012

d
the school auditorium has 8 rows of seats, divided in three rows. Each section has 15 seats. How many seats are there in total?
September 5, 2012

health
The lower thigh muscles are rectus femoris, vastus lateralis and medialis. Located in the back of your leg are the hamstrings. These muscles help you run, jump, and walk!
August 22, 2012

Macroeconomics
D Marginal Cost
July 10, 2012

statistics
In a survey of 400 college students, 40 were left-handed. Treating the sample as if it were random and using 0.015 as the standard deviation of the sampling distribution of the sample proportion, what is the lower bound of a 95% confidence interval for the population proportion?
May 18, 2012

marketing
Unit 5 Individual Project Deliverable Length: 4-5 body pages, 1 PERT chart, 1 Gantt chart Details: Using your current work organization (or an organization of interest) as the subject matter, research the elements of business and prepare an APA formatted paper that: Analyzes ...
April 22, 2012

Calculus
2) 2*x*e^(-4) 3) 2*x*e^(sin(x))+x^2*cos(x)*e^(sin(x)) 1) e^(x)*sin(x)^2+2*e^(x)*sin(x)*cos(x)
April 20, 2012

maths
a) 1/6,1/7,1/8,...
April 20, 2012

Science
idk!!
April 8, 2012

simple subject
What is the simple subject in: The black and white Schnauzer barked all day long.
March 27, 2012

math
0.009615
March 26, 2012

biology
Why is a denaturing solution used in the Southern blotting technique?
March 9, 2012

physics
DOnt know
February 29, 2012

chemistry
32.2
February 29, 2012

math
how many line segments are in the word FAME?
February 28, 2012

algebra
how do you solve -x+2y=2
February 8, 2012

Physics C
A point charge of 5.5 µC is located at the center of a spherical shell of radius 30 cm, which has a charge −5.5 µC uniformly distributed on its surface. Given: ke = 8.98755 × 10^9 Find the electric field for a point inside the shell a distance 12 ...
February 1, 2012

World Civ
What were the social and administrative foundations of the absolute power of Ming Quing emperors?
February 1, 2012

World Civ
What were the social and administrative foundations of the absolute power of Ming Quing emperors?
February 1, 2012

World Civ
How did advances in military technology change warfare in 16th century Japan? How was the strategic balance of power reflected in the government created by Tokugawa leyasu?
February 1, 2012

World Civ
Why were so many people living in the European countryside dependent on aristocracy? (during and before the agricultural revolution in Europe)
February 1, 2012

geometry
Quadrilateral QRST is a square. If the measure of QR is 3x – 6 and TS is 6 - x. Find the area of the square.
January 20, 2012

english
Actually, can you just post your email address, and then we can figure stuff out through email?
January 9, 2012

english
When you get the answers to the final....please post them!
January 9, 2012

english
Explain your changes?
January 3, 2012

home economics
When were the Home Economics Courses dropped or greatly reduced by the school system in Ontario.
November 27, 2011

Calculus 1
If you have 280 meters of fencing and want to enclose a rectangular area up against a long, straight wall, what is the largest area you can enclose?
November 22, 2011

Physics
Air in a balloon does 25 J of work while absorbing 81 J of heat. What is the change in internal energy?
November 19, 2011

Ashford
Beth gives Megan $2 allowance a week. Then she takes Megan shopping and allows her to select what she wants to buy. If the item desired costs more than $2, Megan's mother suggests she save her money until she has enough saved to pay for the desired item. When Megan ...
November 1, 2011

Maths Grade 8
fart
October 26, 2011

Algebra
Rewrite -81/(-88) as multipulcation
October 23, 2011

Algebra
whats the answer for 14(3-7x)=-(9+2x) with simple steps on how to do it
October 16, 2011

specific heat capacity
figured it out.
September 26, 2011

specific heat capacity
How much heat would be required to heat 1 gram of pure liquid water from 10C to 20C? How would i approach this problem?
September 26, 2011

math
how do yo convert hte ratio 120:200 to a fraction in simpliest form
September 24, 2011

Math
Jake says that adding 0 does not change a sum. Is he correct? explain.
September 20, 2011

Math
Ms. Poole, my PE teacher, asked the 100 seventh in my school if they could swim. Half the boys and two thirds of the girls said yes. Seventeen boys said no. How many seventh graders know how to swim?
September 13, 2011

Chemistry
When 1.0 g of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 g/mL a) How many megajoules are released when 3.0 of gasoline burns? b) If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 3.0 gal ...
September 12, 2011

chemistry
When 1.0 g of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 g/mL a) How many megajoules are released when 3.0 of gasoline burns? b) If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 3.0 gal ...
September 10, 2011

american history
what is one reason colonist came to america
August 24, 2011

Chemistry
A sample of 0.43 moles of a metal M reacts completely with excess chlorine to form 18.23 grams of MCl. How many moles of Cl are in the sample of MCl that forms?
July 30, 2011

criminal law
thank you Ms. sue
July 22, 2011

criminal law
Describe current parole and mandatory release policies
July 22, 2011

statistics
d
July 21, 2011

math
Simplify: (3-7x)/8+(2x+3)/8
July 5, 2011

geometry
Given the quadrilateral ABCD with the following vertices A(-4, 0), B(10, 0), C(10, 10), and D(0, 14), find its area.
June 6, 2011

geometry
Consider the following. newskills15 Solve for BC (the the nearest hundredth).
June 6, 2011

Precalculus
Consider the following. f\(x\) = 5tan(1/3 x + pi/2) The period of the function above is ...
June 6, 2011

geometry
In ΔABC, angleB = 46°, angleC = 28° and AB = 50. Find BC (to the nearest hundredth).
June 6, 2011

chem
calculate the amount of heat (kcal) released when 50.0 g of water at 100degrees Celsius hits the skin and cools to a body temperature of 37 degrees Celsius.
June 2, 2011

chemistry
calculate the volume of sulfur dioxide produced when 27.9 mL O2 reacts with carbon disulfide to produce carbon dioxide and sulfur dioxide at STP
May 25, 2011

physics
(c) Tube (c) is again filled with water. A1 and A2 are the same as in part (b). Two pistons apply different forces to the water in the tube so that the water in the right side of the tube is a height h = 0.43m above the height of the water in the left side of the tube. If F2...
May 1, 2011

e-commerce
The business plan should include the concepts and ideas covered during the past several weeks. The following points need to be addressed in your business plan for the establishment of an e-commerce site: The e-commerce infrastructure Marketing concepts for the e-commerce ...
April 28, 2011

Math 116
Use all available methods (in particular, the Conjugate Roots Theorm if applicable) to factor the polynomial function completely, making use of the given zero, f(x)=x^4+x^3+4x^2+196x-2205; -7i is a zero.
April 8, 2011

calculus
A missile is fired at an angle of 75 from the horizontal. At one point, its speed was 900 mph. Find its horizontal velocity in miles per minute
April 1, 2011

math
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume...
March 6, 2011

chem
Magnesium burns in air to produce magnesium oxide, MgO, and magnesium nitride, Mg3N2. Magnesium nitride reacts with water to give ammonia. Mg3N2(s) + 6 H2O(l) → 3 Mg(OH)2(s) + 2 NH3(g) What volume of ammonia gas at 24°C and 753 mmHg will be produced from 4.46 g of ...
March 6, 2011

Physics Mehanics
A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. (Hint: Consider the stick to be a thin rod and use the conservation of energy ...
February 24, 2011

Physics Mehanics
In the figure below, wheel A of radius rA = 11 cm is coupled by belt B to wheel C of radius rC = 23 cm. The angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s2. Find the time needed for wheel C to reach an angular speed of 110 rev/min, assuming the...
February 24, 2011

Physics Mechanics
Thanks a lot. Your answer are both right. Thank you so very much.
February 23, 2011

Physics Mechanics
Particle A and particle B are held together with a compressed spring between them. When they are released, the spring pushes them apart, and they then fly off in opposite directions, free of the spring. The mass of A is 3.00 times the mass of B, and the energy stored in the ...
February 23, 2011

Physics Mechanics
Thank you so much drwls. You're a life saver. Thanks a lot! :)
February 20, 2011

Physics Mechanics
A banked circular highway curve is designed for traffic moving at 57 km/h. The radius of the curve is 211 m. Traffic is moving along the highway at 48 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the ...
February 20, 2011

Physics
Suppose that the terminal speed of a particular sky diver is 170 km/h in the spread-eagle position and 315 km/h in the nosedive position. Assuming that the diver's drag coefficient C does not change from one position to the other, find the ratio of the effective cross-...
February 20, 2011

Precalc
Its #2 which is 3 because you add all the degrees of all the parenthesis and add them up and that's ur answer
February 20, 2011

Science
Its 133.88 degree Celsius.. Hope it helps :)
February 20, 2011

Physics
In a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 3.5 kg book is pushed from rest through a distance of 0.87 m by the horizontal 25 N force from the broom and then has a speed of 1.58 m/s...
February 20, 2011

Algerbra 1
4.50
February 10, 2011

Chem (but i think its physics)
203lbs= 902.94N 110ft= 33.528m 902.94*33.528*3=90 822J 90822J* 1Calorie/(4184J) = 21.7
February 3, 2011

Chem (but i think its physics)
Ok so this problem appeared in my online chem homework, but it looks alot more like a physics problem. I have no idea how to do it A 203 lb man eats an order of French Fries consuming 250 Cal of food energy. Afterwards he feels guilty and decides to work off the excess ...
February 3, 2011

8th grade science
what voltage produces a current of 500 amps with a resistance of 50 ohms?
January 19, 2011

chemistry
Sorry Doc but the satallite is 30 miles above the earth and the question states there and back. please check again.
January 13, 2011

Chemistry
What is the molality of a solution of sucrose(molar mass=342) dissolved in water that is 25% sucrose by mass?
January 9, 2011

chemistry
Which of the following properties increase with increasing atomic number for fluorine and chlorine? I. melting point of the elements (yes) II. boiling point of the hydrogen halides i'm not sure about II because HF has the highest boiling point but fluorine and chloride fit...
December 31, 2010

chemistry
Which of the following properties increase with increasing atomic number for fluorine and chlorine? I. melting point of the elements (yes) II. boiling point of the hydrogen halides i'm not sure about II because HF has the highest boiling point but fluorine and chloride fit...
December 31, 2010

chemistry
At 100 degrees celsius, the ratio of the average kinetic energy of oxygen molecules, O2, to the average kinetic energy of methane molecules, CH4, is: A) 4:1 B) 1:4 C) 1:2 D) 1:1 I think it's D because the kelvin temperature is the same for both collection of gases, and ...
December 31, 2010

physics
at what angle with respect to the horizontal should the shot put be launched if the starting height is 2.0m to have the greatest range?
December 11, 2010

12th grade
Firm A offer 40,000 salary with $2,000 increase evey year. FIRM B offer 38,500 salary with 5% increse every year. After how many year he will make same money?
December 6, 2010

Chemistry
Before 1962,dimes minted in the US contained the precious metal silver.A 2.08 gram dime is dissolved in nitric acid and reacted with saturated sodium chloride solution. This process precipitates all the silver in the dime as 342mg of AgCl(s). How many moles of silver did the ...
December 6, 2010

Chemistry
Before 1962,dimes minted in the US contained the precious metal silver.A 2.08 gram dime is dissolved in nitric acid and reacted with saturated sodium chloride solution. This process precipitates all the silver in the dime as 342mg of AgCl(s). How many moles of silver did the ...
December 6, 2010

earth
A cold front traveling at an average speed of 35 km/h eastward is 280 km due west of you. Appoximately how long will it be before your location experiences a sudden temperature drop?
December 3, 2010

Algebra
120
December 2, 2010

test
235U 92
November 29, 2010

Chemistry
Example: 235U 92
November 29, 2010

algebra
how can 2 boys weighing 100lbs each and a man weighing 200lbs cross the river in a boat that only holds 200lbs safely?
November 20, 2010

English
There is
November 20, 2010

5th grade
if 5/17 of region is shaded what part is not?
November 11, 2010

Calculus
A particle moves in a straight line with velocity t^-2 - 1/9 ft/s. Find the total displacement and total distance traveled over the time interval [1,4]. I found out that the total displacement is .4116 But I cannot find the total distance traveled.
November 11, 2010

Physics
where did the 3x/5 come from
November 7, 2010

AP Chemistry
What is the Dumas Method in regards to the molas mass of a gas?
November 4, 2010

AP Chemistry
The molar mass of a volatile liquid (one which vaporizes easily) can be determined by a the DUMAS METHOD.' In this process a small amount of the liquid (a few drops) is placed in a clean flask. The mouth of the flask is covered with a piece of foil that has a small hole (...
November 4, 2010

physics
balls
October 31, 2010

chem
What is the pH of 0.2 M HN3?
October 31, 2010

physics
idk
October 21, 2010

History
when i said even the hebrews tried to secure their race i meant before the world wars.
October 17, 2010

History
LBN means white in akkadian and they were a peaceful people. Hitler decided to take the sigma doubled as his symbol as it dealt with what he thought he was being the furor after the king named sin. which was also akkadian. Illuminati have thier roots in this in tales dealing ...
October 17, 2010

History
Anglo saxons get thier start in akkadian for LBN or palestine which is lebanon so i am led to think. It deals with old ritualistic root philosophies on the beginning of the histories of the civilizations which was the dragon then the beast then the lamb like beast. Sargon ...
October 17, 2010

Chem
5. The LC50 for fluorine is 0.29 mg/m3. What is this in ppm at 25 oC and 1 atm pressure? How does this compare to the PEL?
October 17, 2010

College Chem
Recycling of PET soft drink bottles involves heating with methanol and an acid catalyst to liberate ethylene glycol and dimethylterphthalate (methyl ester of pthalic acid). These can then be used as monomers to make new PET products. Write an equation for this recycling reaction.
October 4, 2010

College Chem
How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned? C7H8 + 9O2 ==> 7CO2 + 4H2O 1 gallon toluene = about 3,785 mL density = about 0.867 g/mL mass toluene = 3785 mL x 0.867 g/mL = 3282 grams. moles toluene = grams/molar ...
October 4, 2010

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