jhon
Popular questions and responses by jhon
math
cotx+tan2x=cotxsec2x prove
asked on February 14, 2013 
English
Which adjective best describes the community's attitude toward Mari Djata's inability to walk in Sundiata? A. fearful B. indifferent C. sympathetic D. mocking B?
asked on January 12, 2015 
Chemistry
How much energy in kilojoules is released when 25.0 g of ethanol (C2H5OH) vapor at 93.0 C is cooled to 10 C? Ethanol has mp = 114.1 oC, bp = 78.3 oC, ΔHvap = 38.56 kJ/mol, and ΔHfus = 4.93 kJ/mol. The molar heat capacity is 112.3 J/(K.mol) for the
asked on September 7, 2014 
chem
A 0.069 gram sample of a metal reacted with HCl and produced 45.31 mL of H 2 gas at 25¡ÆC and 1 atm pressure. The metal is known to react with HCl according to the following reaction, 2 M + 6 HCl > 2 MCl 3 + 3 H 2 What is the molar mass of the metal?
asked on October 31, 2014 
Math
A radioactive substance decays exponentially. A scientist begins with 130 milligrams of a radioactive substance. After 20 hours, 65 mg of the substance remains. How many milligrams will remain after 24 hours?
asked on July 28, 2019 
Chemical Engineering
How much acetone liquid (in mls) is required to produce a vapor concentration of 200 ppm (parts per million) by volume in a room of dimensions 3 x 4 x 10 meters? The temperature is 25oC and the pressure is 1 atm. The following physical property data are
asked on September 7, 2010 
math help
Mr. Donahue needs 4 1/2 pounds of flour to make 5 loaves of bread. He bought a 50pound bag of flour that costs $64.99. About how much will Mr. Donahue spend on flour for a loaf of bread? A $1.17 B $5.85 C $6.50 D $58.49 how is this answer A
asked on January 18, 2016 
i need your help damon
Jill’s room is 12.5 feet long and 11.5 feet wide. She made a scale drawing of the room with a scale of 0.5 inch = 2 feet. What is the perimeter of Jill’s room in the drawing? A. 12 inches B. 24 inches C. 48 inches D. 96 inches
asked on January 14, 2016 
logic
Camilo, Diego, Esteban transport on their bikes apples, the way was splitted in two parts to handle the weight. In the first step for each 6 apples that carries Camilo diego carries 5 Esteban 4, in the second step for each 2 apples tath carries Camilo,
asked on January 10, 2014 
Social studies
How did the Qin dynasty lose the Mandate of Heaven? A.through invasions by nomadic herdsmen the emperor's army couldn't defend against B.through natural disasters the government was unable to cope with C.through famine caused by many years of drought
asked on February 8, 2019 
Science
An athlete runs on a circular track 7m.calculate the distance and displacement covered by him after 3 rotations?
asked on September 12, 2016 
MATH
A number has three distinct digits. The sum of the digits equals the product of the digits. How many threedigit numbers satisfy this condition?
asked on September 3, 2016 
Algebra
Find 8 values of c that make the following expression factorable. x^2+3x+c. How did you know?
asked on March 7, 2018 
physical science
A sample of tin (Cp = 0.227 J/g•°C) is placed in a freezer. Its temperature decreases from 15.0°C to −10.0°C as it releases 543 J of energy. What is the mass of the sample? Round your answer to three significant figures.
asked on June 30, 2017 
economics managerial
total revenue equation TR = 5000Q – 5Q2 and total cost equation C = 500 + 3Q2 Calculate this firm’s profit maximizing price, quantity, total revenue, total cost, and total
asked on April 20, 2016 
damon i need your help again
Julie deposited $300 into a simple interest savings account that earns 1.34%. If no money is added or withdrawn from the account, about how long will it take for the interest to equal the deposited amount? A. 8 months B. 1 year C. 7 years D. 75 years
asked on January 14, 2016 
i really need help but dont know how to do it
Taylor made a scale drawing of his room using a scale of 0.25 inch = 1 foot. On the drawing, the length of his room is 3.25 inches and the width is2.75 inches. What is the area of Taylor’s actual room? A. 36 square feet B. 48 square feet C. 143square
asked on January 14, 2016 
physics
a 20 kg traveler's bag is being pulled along the floor with a force of 50 NF. the force is applied on the handle forming an angle of 30 degree with the horizontal. neglecting friction,what is the acceleration og the bag? How much force is exerted by the
asked on November 29, 2014 
chem
Fe + O2>Fe2O3 How many grams of iron are required to convert 80 mL of oxygen at STP?
asked on November 4, 2014 
Young Harris College
How much energy is needed to heat 8.50 g of ice from 30.0 C to 70.0 C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(mol.K) for ice and 75.3 J/(mol.K) for liquid water. I got 19.24kJ but it isn't correct!!
asked on September 7, 2014 
math
Many people are trying to reduce their carbon footprint. Amrita’s carbon footprint this year was 85% of last year’s footprint. If her carbon footprint this year is 34 tonnes,what was her carbon footprint last year? PLZ NEED HELP
asked on November 22, 2013 
physics
A motorboat travels due north at a steady speed of 3.0 m/s through calm water in which there is no current. The boat then enters an area of water in which a steady current flows at 2.0 m/s in a southwest direction, as shown in the next picture. Both the
asked on August 16, 2012 
garyson
A person rides up a lift to a mountaintop, but the persons ears fail to pop –that is, the pressure of the inner ear does not equalize with the outside atmosphere. The radius of each ear drum is 0.40×10ˆ2m. The pressure of the atmosphere drops from
asked on December 24, 2011 
chemistry
Molecular shape of BrF3 by VSEPR theory
asked on August 30, 2010 
Algebra
Write the number 7.1\times 10^{4}7.1×10 4 in standard form.
asked on September 2, 2019 
Math
34÷ 45=_
asked on January 9, 2018 
math
Compare each pair of numbers. Use . greater than 3/5 and 5/8
asked on October 17, 2017 
Algebra
A cashier has only one dollar bills, quarters,and dimes. List all the ways you could receive $2.50 in change $1 Bills Quarters Dimes Ex. 2 2 0
asked on September 12, 2017 
econ
Which best describes interest?
asked on April 26, 2017 
math
In five games, you score 16, 12, 15, 13, and 17 points. How many points must you score in the sixth game to have an average of at least 15 points?
asked on October 27, 2016 
science,physics
a 5kg bomb exploded into two fragments .If one fragment with 3 kg moves in a direction with 5m/s then what is the velocity of the second fragment of mass 2kg
asked on September 13, 2016 
history
what about Mohawk interactions with the europeans
asked on April 18, 2016 
computer Science
1. Create a program which will allow the user enter ten numbers. The program is to count how many numbers were above 50. Hint: You will need to incorporate a Selection (If…then) statement.
asked on January 25, 2016 
math help
Jordan earns $11.35 per hour and works 40 hours per week. He then earns a 20% pay raise. How much money will Jordan now make each week? A $363.20 B $454.00 C $463.08 D $544.80 how is this d
asked on January 18, 2016 
math help fast
During an oil change, each car needs 4 1/2 quarts of oil. Each 5quart container of oil costs $14.99. Before tax, how much will the oil cost Mr. Richards for both cars in a year? A $44.97 B $80.94 C $89.94 D $107.93 why is this c
asked on January 18, 2016 
math help
Mr. Richards has two cars that he changes the oil in every four months. During an oil change, each car needs 4 1/2 quarts of oil. Each 5quart container of oil costs $14.99. Before tax, how much will the oil cost Mr. Richards for both cars in a year? A
asked on January 18, 2016 
math help
Mr. Donahue needs eq177745_s1 pounds of flour to make 5 loaves of bread. He bought a 50pound bag of flour that costs $64.99. About how much will Mr. Donahue spend on flour for a loaf of bread? A $1.17 B $5.85 C $6.50 D $58.49 how is this on A please
asked on January 18, 2016 
math help
Mrs. Williams is going to purchase a plastic cover for her outdoor fish pond. The area of the fish pond is 25 m2. However, she must purchase a cover that is 12% more than the pond area in order to cover the entire edges of the pond. The plastic cover costs
asked on January 18, 2016 
math help
Hayley wants to purchase tile for the floor in a rectangular room that measures 15 feet by 14 feet. The tile costs $4.25 per square foot. Sales tax is 6.5%. What will be the total cost to cover Hayley’s floor with tile?
asked on January 18, 2016 
math
A new automobile costs $23,782, but after one year it is worth $17,668. What is the approximate percent of decrease in the value of the automobile?
asked on January 14, 2016 
Math
An electric dentist chair lifts ruth,110,0.3 meters in 10 seconds what is the power developed by this chair?
asked on December 2, 2015 
ALGEBRA
A rectangular garden is 30 ft wide. If its area is 2700 ft{}^2, what is the length of the garden?
asked on September 19, 2015 
trigonometry
find the radius of a circle in which a 59 foot chord subtends an angle of 12 degree at the center
asked on September 16, 2015 
chemistry
Hess¡¯ law says that when we add reactions together we can also add the enthalpies. Given the following set of reactions, use Hess¡¯ Law to calculate the enthalpy of the reaction given below. N2H4 + H2 ¡æ 2 NH3 ¥ÄH¡Æ = ? N2 + 3 H2 ¡æ 2 NH3
asked on April 26, 2015 
chemistry
The following experimental data were obtained for the reaction; 2 NO + 2 H2 ¡æ N2+ 2 H2O Rate/105M/s [NO]/102M [H2]/102M 0.50 0.50 0.20 2.00 1.00 0.20 0.25 0.25 0.40 Write a rate law in agreement with the data. Rate = What is the value and units of
asked on February 1, 2015 
physics
a 20 kg traveler's bag is being pulled along the floor with a force of 50 NF. the force is applied on the handle forming an angle of 30 degree with the horizontal. neglecting friction,what is the acceleration og the bag? How much force is exerted by the
asked on November 30, 2014 
chemistry lab
If a portion of your aspirin sample had broken down, how would that effect the total amount of base used? What would the effect be on the percentage of aspirin in your sample?
asked on October 25, 2014 
physics
If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr
asked on October 12, 2014 
chemistry
If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr
asked on October 12, 2014 
logic
a team of Andres Bruno carlos Daniel and Esteban participated in a tennis doubles tournament so two of one team play against other two It is known that Andres participated in a game Bruno in 2 carlos in 2 Daniel in 3 and Esteban in 4 then the amount of
asked on February 17, 2014 
logic
CLaudia has 4 task to do go to the market, study, clean , sport it is known  go to the market if study  study if she does not clean  if she does not clean then she goes to the market a 15% b 12% c 10% d 24%
asked on February 17, 2014 
logic
a survey of three marks of soda has of 100 people 83 drinks at least 1 of 3 marks 54 just drink 1 19 drinks 2 of 3 between the people the % that drink the 3 are a 15% b 12% c 10% d 24%
asked on February 17, 2014 
logic
100 days after a sunday will be a day a Sunday b Tuesday c thursday d monday
asked on February 17, 2014 
logic
In a soccer tournament between four teams A,B,C,D wich was free for all the scores were A 4 points B 4 points C 3 points D 1 point In this tournament the winner gets 2 points, the draw 1 point the looser 0. It is known that each team has a goal so. 1 The
asked on February 17, 2014 
logic
in a bike competition with 21 laps was observed that 13% quit before 5 laps, 17% quit later than 5 laps but less than 15, and the others 210 finished the competition the number of bikers that quit before the 5 lap were: a) 27 b) 39 c) 43 d) 56
asked on January 10, 2014 
logic
the rectangle represented the AB side is 4cm the side BC is 6 cm i want to build a triangle taking the AB segment and the third vertice inside the triangle so his area becomes higher than 8 cm*cm. the area in cm*cm of the region of the rectangle in which
asked on January 10, 2014 
logic
the rectangle represented the AB side is 4cm the side BC is 6 cm i want to build a triangle taking the AB segment and the third vertice inside the triangle so his area becomes higher than 8 cm*cm. the area in cm*cm of the region of the rectangle in which
asked on January 10, 2014 
classical mechanics
A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 20.0 cm. The two vertical pipes are open at the top, and the difference in water level between
asked on January 3, 2014 
Logic
Claudia has four home works to do, go to the market, study for the exam, clean the room, and practice sports, she knows that: she goes to the market if she studies for the exam. she studies for his exam if she does not clean his room if she does not
asked on January 3, 2014 
math
Please show all of your work in the space below. Please present and organized and complete solution. A garden will be made up of a parallelogram, a rectangle and a triangle. The garden must have an area of 500m square. Draw two possible gardens. Determine
asked on November 22, 2013 
physics
a pitching machine throws a baseball at a batter with an initial velocity of 22.0 m/s at an angle of 30 degrees to the horizontal. the ball is 1.60 m above the ground when it is pitched. a) if the batter hots the ball at the same height as it was launched
asked on October 4, 2012 
calculus(related rates)
Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 6.5 meters. If the
asked on May 5, 2012 
math
a drawing of a deck has a scale of 1 inch to 5 feet. the actual deck is 18 feet long.how long is the deck in the scale drawing?
asked on May 3, 2012 
calculus
the dimensions of a closed rectangular box are measured as 30 in, 40 in.. and 60 in.. with a maximum error of 0.2 in. in each measurement. use differentials to estimate the maximum error in calculating the volume of the box
asked on April 1, 2012 
calculus
find the approximate change in z when the point (x,y) changes from (1,1)to (1.01, 0.90) f(x,y) = xe^(y) + ye^(x)
asked on April 1, 2012 
Chemistry
If a 2.6 g of weak diprotic acid were dissolved in 100 mL of water and a 10 mL aliquot of this solution required 21.6 mL of 0.1 M NaOH to reach the first endpoint, what are the equivalent and formula weights of H2A? I think I first need to find the moles
asked on February 16, 2012 
English
Is it self plagerism if I take the same argument or main idea from a paper that I wrote last semester and use that same principle/argument/main idea/thesis in another paper for the next semester if it's is completely rewritten with different words and
asked on December 27, 2011 
Computer Science (MATLAB)
Given an arbitrary one dimensional vector v imputed by the user for example v='Helllllloooooo' or v='Helo' I was able to append empty characters onto any one dimensional vector that the user can enter so that way the total length of the vector is a
asked on November 14, 2011 
Computer Science (MATLAB)
I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value
asked on November 1, 2011 
Computer Science (MATLAB)
I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value
asked on November 1, 2011 
Computer Science (MATLAB)
Given a vector of values of zeros and ones such as [1 0 1 0 0 0 1 0] I'm asked to, given a probability provided by the user, use that probability to change the values in the vector using that probability. For example given the vector [0 1 0 0 0 1 0 0 0 1]
asked on October 18, 2011 
English
Hi, I'm writing a paper for English and my professor crossed off the authors name in one of quotes for the citation of my rough draft as if it was suppose to be there. Something like xxxxxxxxxxxxxxxxxxxxxx (john 59) and she crossed off john as if I wasn't
asked on October 10, 2011 
science
the last question i do not get can one of y´all help me out lisa is working on a science project her task is to answer the question ¨does rogooti(which is a commerical hair product) affect the speed of hair growth control group: independent variable:
asked on September 1, 2011 
science
can you tell me a website on elements
asked on January 28, 2011 
science
Can you give me awebsite about phase change?
asked on January 17, 2011 
science
Can you give me a website about attoms
asked on January 15, 2011 
science
Where can I find some information about nourvis system and endocrine system?
asked on December 27, 2010 
Normal distribution
The breaking strength of cable is known to be normally distributtes with a mean of 4000 kg and a standard deviation of 25 kg.The manufacturer prefers that at least 95% of his product meet a strength requirement og 4050 kg.is that requirement being met?if
asked on December 22, 2010 
social studies
Where can I find some information about native americans
asked on December 12, 2010 
9 th grade geomitry
how do you do 19= n  9 ??????
asked on September 9, 2010 
Perimeter
Draw a figure with a perimeter of 24, using 11 squares
asked on April 18, 2010 
Perimeter
Draw a figure with a perimeter of 24 squares, using 21 squares
asked on April 18, 2010 
7th grade english
Is it possible to find a antonym for a noun
asked on December 29, 2009 
physical science
How much work is done by the gravitational force on an object of mass 9.40 kg that is initially at rest when it falls down for a time of 1.85 seconds. Ignore air resistance
asked on December 21, 2009 
sociology
How does conflict theory and functionalist theory apply to conditions and compensations of the workers in Barbara Ehrenreich's "Nickle and Dimed"?
asked on October 20, 2009

algebra
It’s really hard
posted on April 15, 2019 
Social studies
That's you're correct! It helps alot!
posted on February 8, 2019 
math
Hello, I'm sorry but I got a 6/17 and this is totally not okay. I was checking my answers and totally changed them because of this and it did not work at all. These answers are completely wrong
posted on May 8, 2018 
ENG1010
b
posted on March 18, 2018 
algebra
solve 4(7x  4) = 124
posted on November 20, 2017 
Math
a 100 pound person would weigh 20 pounds on lo, a moon of jupiter. a person weighing 150 pounds would weigh 25 pounds on the moon. use ratio tables to determine which moon would make a person weigh the most
posted on November 15, 2017 
Physics
fdf
posted on August 27, 2017 
Social Studies
he is right
posted on April 25, 2017 
English
If a writer wanted to put emphasis on the person doing an action, which of these statements would be the best choice? A) active voice B) passive voice C) subjunctive mood D) interrogative mood
posted on April 8, 2017 
Language Arts
thanks i play mincraft
posted on March 29, 2017 
LA HELP/CHECK!
yes these are all correct
posted on March 27, 2017 
math
yes its true
posted on January 30, 2017 
geometry
Given m = 10 and n = 9, the ratio of n to m is 10/9. True False
posted on January 24, 2017 
math
Actually it is 2.07 because 17.97+25.49 is 43.46 and 43.46+0.33 is 43.79 then subtract 50.00 and 43.79 then you divide 6.21 from 3 and you will get 2.07
posted on December 8, 2016 
history
happyness
posted on April 18, 2016