Saturday
February 13, 2016

# Posts by mark

Total # Posts: 1,470

math problem
- Mr. Hermann, a stamp collector , sold 2 stamps for \$5000 each. Based on his cost , he made a 25% profit on one stamp and lost 20% on the other stamp. What was Mr. Hermann's total loss on the two transactions? - There are five chidren in the Roberts family. Amy and Ariel ...
March 13, 2013

Pleass Help With MATH
Read this story to answer the following questions: Diego is building an architectural rendering of a house. For a portion of the roof, Diego cuts and folds a net for a triangular prism. the base of the prism is an isoceles triangle. the triangle has a base of 24 inches and a ...
March 6, 2013

3rd math
2 53 x7 371 No rick is not correct because 53x7=371
March 6, 2013

mAth
story: Diego is building an architectural rendering of a house. For a portion of the roof, Diego cuts and folds a net for a triangular prism. the base of the prism is an isoceles triangle. the triangle has a base of 24 inches and a height of 5 inches. the distance between the ...
March 6, 2013

Statistics
The rate of chlamydia infection was reported as 2.78% in a recent year. Under certain conditions, a preliminary screening test for the chlamydia bacterium is correct 96% of the time. One person is randomly selected from the population. find the true positive. Can someone ...
March 6, 2013

stats
okay, so I think the true positive is 96%, but what about the true negative, false positive and the false negative?
March 6, 2013

stats
The rate of chlamydia infection was reported as 2.78% in a recent year. Under certain conditions, a preliminary screening test for the chlamydia bacterium is correct 96% of the time. One person is randomly selected from the population. find the true positive. Can someone ...
March 6, 2013

Math
He spent 2/3 of his money. The movie cost 6. How much does he have left
March 5, 2013

physics
A softball bat is rotating at 460 rotations per minute at contact with the ball. What is the angular velocity in radians?
February 25, 2013

physics
A skater rotates 760 degrees clockwise, stops, and rotates counterclockwise for 340 degrees. What is her angular distance? Angular displacement?
February 25, 2013

physics
A softball player swings her bat through her full range of motion of 392 degrees in 0.3 secs. What is the angular velocity of the bat? What is the average acceleration of the bat?
February 25, 2013

physics
In order for a ski jumper to attain maximum projectile distance she must reach a velocity of 30m/s. of the runway of the takeoff ramp is 70m long, how quickly ust she accelerate?
February 25, 2013

physics
A freestyle skier hits the take off ramp with an initial velocity of 17.5 m/s with a purely vertical take off (90 degrees). What is the peak height that the skier will reach?
February 25, 2013

physics
A shot-­‐putter releases the 16 lbs. shot at an angle of 41 degrees. If the shot travels a horizontal distance f 34 m to reach its peak at midflight, how high did the shot go and what is the displacement of the resulting vector at midflight?
February 25, 2013

physics
A cyclist has a final velocity of 30 m/s after coasting down hill for 2 seconds. If the cyclist underwent a constant acceleration of 7.5m/s2 during the descent, what was his initial velocity at the top of the hill?
February 25, 2013

geography
what is exsolation?
February 24, 2013

Physics
A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?
February 24, 2013

Math
The sides of the triangle at right are formed by the graphs of 3x+ 2y = 1, y = x − 2, and −4x+ 9y = 22. Is the triangle isosceles? How do you know?
February 12, 2013

Math
75/15 = 5. So each baseball weighs 5 ounces. 15/5 = 3. Three baseballs weigh 15 ounces.
February 11, 2013

Math
Josh borrows some money on which he makes monthly payments of \$125.43 for 3 years. If the interest rate is 5.4%/a compounded monthly, what will be the total amount of all of the payments at the end of the 3 years?
February 11, 2013

Math
Maria bought 5 cans of tennis balls. Each can contained 3 tennis balls. How many tennis balls did Maria buy altogether?
February 11, 2013

Algebra
There are 4 children and 17 adults.
February 10, 2013

Math
Explain It Why is 10-0=10, but 0/10=0? Explain
February 10, 2013

chem
The ΔHvap of a certain compound is 34.68 kJ·mol–1 and its ΔSvap is 93.60 J·mol–1·K–1. What it the boiling point of this compound?
February 10, 2013

math
taylor was having a party.she invited 20 friends to her party, if each person shook hands with every other person .how many handshakes would there be? please explain,thanks
February 10, 2013

chemistry
OK thanks.... In the question, and in the example in the textbook there was no example of using an ICE table. Tables make assigning values so much easier
February 10, 2013

chemistry
Sorry I should have left that out, it's just the formula HCOOH(aq) <-----> H^+ (aq)+ HCOO^-(aq)
February 10, 2013

chemistry
HCOOH(aq) <-----> H^+ (aq)+ HCOO^-(aq) The equilibrium constant (Ka) for Reaction 3 at 25 °C is 1.80 × 10−4 mol dm−3. Calculate the equilibrium concentration of hydrogen ions if the concentration of formic acid at equilibrium is 0.00500 mol dm−3
February 10, 2013

science
Oh yeah! Those values apply to this equation: HCOOH(aq) <-----> H^+ (aq)+ HCOO^-(aq)
February 10, 2013

science
The equilibrium constant (Ka) for Reaction 3 at 25 °C is 1.80 × 10−4 mol dm−3. Calculate the equilibrium concentration of hydrogen ions if the concentration of formic acid at equilibrium is 0.00500 mol dm−3. (Show all of your working and give your ...
February 10, 2013

The perimeter of the square is 2cm longer than the perimeter of the triangle.Write an equation for the perimeter of the square and then determine the length of each side of the square. Thank you in advance.
February 7, 2013

Math
Red beads = 16 Yellow beads = 16-8 = 8 Green beads = 16 +7 = 23 16 red, 8 yellow, 23 green is 16+8+23 = 47 total beads
February 5, 2013

English
choosing a conjunction and the relationship it expresses: ------you buy a rare manuscript, make certain of its authenticity. I used "Before" but it would be "time" or Should I use "If" and it would be "condition" This is so confusing!!!
January 29, 2013

Chemistry
I'm asked to tell which of the following peptide segments is most likely to be part of a stable Alpha Helix at physiological pH? Only 1 can be chosen 1. gly-gly-gly-ala-gly 2. gly-arg-lys-his-gly 3. pro-leu-thr-pro-trp 4. lys-lys-ala-arg-ser 5. glu-leu-ala-lys-phe 6. glu-...
January 27, 2013

Chemistry
You have 475 mL of an 0.47 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.00?
January 19, 2013

finance
1. The U.S. ﬁnancial system is composed of: (1) policy makers, (2) a monetary system, (3) ﬁnancial institutions, and (4) ﬁnancial markets. Indicate which of these components is associated with each of the following roles: a. accumulate and lend/invest ...
January 19, 2013

finance
ATM Banc has the following liabilities and equity categories: Deposits \$9 million, Other liabilities \$4 million, Owners’ capital \$2 million. . a. What would be the bank’s total liabilities and capital if owners’ capital were half the size of other liabilities? b...
January 19, 2013

arithmetic
change 12/23 into a decimal to the nearest hundreth's
January 16, 2013

statistics
January 15, 2013

statistics
these numbers are wrong. did you change the numbers??? where are you getting this data???
January 14, 2013

math
which digits are in the ones place of a number multiplied by 5? a.0 or 1 b.0 or 5 c.2 or 4 d.2 or 5 Is it b????
January 14, 2013

math
which digits are in the ones place of a number multiplied by 5? a.0 or 1 b.0 or 5 c.2 or 4 d.2 or 5 Is it b????
January 14, 2013

January 10, 2013

many children have more than one figure towards whom they direct attachment behavior. These figures are not treated alike but there is a strong bias for a child to direct attachment behavior mainly towards one particular person. Bowlby used the term "monotropy" to ...
January 10, 2013

what does reseach show about the child;s relationship with the primary parental figure when the child has additional attachments to other people?
January 10, 2013

English-Native speakers
Thank you ;)
January 8, 2013

English-Native speakers
Can someone please make this sentence more "English"? THE ROLE OF ILLUSTRATIONS IN CHILDREN'S BOOKS WRITTEN BY GERMAN WRITERS AND RELEASED AFTER 1950. This is supposed to be the title
January 8, 2013

Ms. Sue (History)
The Europeans raised their own tariff which caused a trade protection war. The American merchants had enormous surpluses and no market to sell their goods. This would cause a fall in prices and industrial instability. Am I on the right track?
December 20, 2012

History
Why was the Fordney-McCumber Tariff of 1922 a BAD thing for the U.S. Economy? There seems to so many and I would like to know the most important ones.
December 20, 2012

math
draw the shape of an ice-cream cone wrapper when it is slit from the edge to the center point and flattened out
December 14, 2012

Math
Find the positive number such that 1/2 of the number multiplied by 1/3 of the number, multiplied by 1/6 of the number is equal to the number itself.
December 12, 2012

English
I need to correct the verb in this sentence. If we would have had the engine tuned, I'm sure we would not be stranded on the highway now. Is this correct? If we had had the engine tuned, I'm sure we would not be stranded on the highway now.
December 11, 2012

Algebra
Can you explain how you got those answers, Raj? Thank You!
December 5, 2012

Algebra
-Alfonso can write 100 practice problems for the math team in 20 hours, Beauregard can write the same number of problems in 30 hours, and Clyde can write the number of problems in 40 hours. Working together, at what time will the three of them finish writing 100 practice ...
December 5, 2012

Chemistry
7.40 g of liquid methanol, CH3OH, are placed in an empty 20.0 L container at 45.0°C. What will be the pressure in the container when equilibrium is established? Assume the temperature remains constant and the volume of any liquid is negligible. The vapor pressure of ...
December 4, 2012

math
how many gallons would a hole 100ft deep by 6ft wide hold
December 3, 2012

English
Thank you very much, Ms. Sue
November 28, 2012

English
"Understanding the cause for Bartleby's reason to be an introvert and to offer polite refusals when asked to do something would suggest he deserves either sympathy or disdain." I need to reword the whole thesis using different words but meaning the same thing. I ...
November 28, 2012

English
"Understanding the cause for Bartleby's reason to be an introvert and to offer polite refusals when asked to do something would suggest he deserves either sympathy or disdain." Thank You Ms. Sue, That was my thesis for a paper and I need to reword it, could you ...
November 28, 2012

English
Could you help me rephrase this sentence? "Understanding the cause for Bartleby's reason to be non-social introvert and to offer polite refusals when asked to do something would suggest whether he deserves sympathy or disdain."
November 28, 2012

English
Could you help me rephrase this sentence? "Understanding the cause for Bartleby's reason to be non-social introvert and to offer polite refusals when asked to do something would suggest whether he deserves sympathy or disdain."
November 28, 2012

history
Do you think that the Korean War was merely a civil war in which the United States supported one side, or should it be considered an international war in which the United States used the United Nations to further its anticommunist policies?
November 28, 2012

English-Native speakers
I can't use that. It is paraphrasing :/ I'll leave it that way "than if they were conducted today"
November 28, 2012

English-Native speakers
Need help with one sentence structure. I don't know if I am going to be able to explain it good. It goes like this "the measures will have to be much more drastic than if they were conducted today" I need help with this part "than if they were conducted ...
November 28, 2012

math
4 different ways
November 27, 2012

Physics
A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)
November 27, 2012

Please, help. I need to create a comic that illustrates and explains what life would be like without 2 organ systems: muscular and digestive. I have an idea for digestive (you can live without gallbladder). I need to explain what is happening inside and outside the body, and ...
November 22, 2012

psychological statistics
Create a sample frequency distribution for one of the variables. Choose either a simple or grouped frequency distribution and explain your choice
November 19, 2012

Physics
An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
November 19, 2012

Physics
An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
November 18, 2012

math
A mother wnats to invest \$6,000 for her son's future education. She invests a portion of the money in a bank certificate of deposit which earns 4% and the remaainder is a savings bond that earns 7%. If the total interest earned after one year is \$360.00, how much money was...
November 17, 2012

English
Hello! Any interesting ideas on how to present new vocabulary? The topic is smoking. Some of the words are:addicted,to promise,to give up and so on. There are 10 unknown words. What to do? :/ There are 22 students (17 years old) and they are learning English for only 3 years
November 17, 2012

Physics
A circular disk of radius 30 cm is rotating with an angular velocity of 2 radians / s. What is the tangential velocity of a point on the rim of the disk? What is its centripetal acceleration?
November 17, 2012

Physics
A 980 kg car traveling at 20 m/s rounds a curve of radius 40 m. What is the friction force that must act on the car to keep it in its circular path?
November 16, 2012

English
Hello! How to present smoking as a topic to students? There are 22 students (17 year olds) and they are learning English for 3 years.So any kind of discussion has to be excluded. I would really like to come up with something interesting! At the end of the lesson I am going to ...
November 16, 2012

Physics
A 3 kg ball is traveling in a circle of radius 2 meters with a tangential velocity of 2 meters/second. Find the centripetal acceleration of the ball and the centripetal force acting on it.
November 14, 2012

math problem
--There is a layer of ice four inches thick covering a small pond when the weather arrives and it begins to smelt. It smelts 1/16 inch the first day, 1/8 inch the second day. 1/4 inch the third day, and keeps doubling the amount melted each succeeding day. all the ice will be ...
November 11, 2012

Physics
A 500 kg cannon rests on wheels that are free to roll. The cannon fires a 2 kg cannon ball horizontally with an average force of 400 N. What is the acceleration of the cannon ball? What is the recoil acceleration of the cannon
November 9, 2012

Geometry
BC has endpoints B(5,9) and C(-4,-3). Find the coordinates of the midpoint of BC.
November 6, 2012

Psychology
Why did early Psychologists NOT focus on "the mind" it was too complex it was genetically determined it was largely unconscious it was unobservable it was environmentally determined
November 5, 2012

Psychology
In order to treat a specific phobia, this therapy would be best Antidepressant drugs Systematic desensitization Implosion therapy Psychoanalysis Aversion therapy
November 5, 2012

English
We express our love for each other by exchanging gifts. (for each other) Is that a prepositional phrase? What is (by exchanging gifts)
November 1, 2012

Math
Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 5 times. Is that correct?
October 23, 2012

Math
Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 5 times. Is that correct?
October 23, 2012

Math
Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 9 times. Is that correct?
October 23, 2012

math
Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 9 times. Is that correct?
October 23, 2012

Math
Need Help!! Find the measure of the small angle between the hands of a clock at 8:16 a.m. I keep getting different answers
October 23, 2012

math
reduce 16/180 to lowest terms
October 16, 2012

maths
find volume and curved surface area of a cone of radius 6.00cm and perpendicular height 8.00cm
October 16, 2012

chemistry
the level of water in a graduated cylinder is 52.7 ml. After a solid object weighing 100 g is added, the level is 87.4 ml. What is the density of this object?
October 14, 2012

Econ
I have spent a few hours on this question. Can anyone help? The demand for Healthy Wheat Cookies is downward sloping, while the supply is upward sloping. Healthy Wheat Cookies are a normal good produced mainly from wheat and sugar. The government recently put a price floor on ...
October 13, 2012

English
Seals balance balls on their noses on command. Is command the object of the prep. on
October 10, 2012

Physics
A freight train has a mass of 1.5*10^7 kg. If the locomotive can exert constant pull of 4.5 *10^5N, how long does it take to increase the speed of the train from res to 80.0km/hr? a)467s b) 444s c)527s d) 425s e) 496s
October 9, 2012

Math
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October 8, 2012

Physics
A typical laboratory centrifuge rotates at 4100 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. (a) What is the acceleration at the end of a test tube that is 11 cm from the axis of rotation? dropped from a height of ...
October 7, 2012

Chemistry
When investigating heat of solution of NaoH& NH4No3, what is the heat of solution of the two cpds?
October 6, 2012

English
There is a control on the television set for making the picture a little less brighter. Is the sentence correct or is it a little less bright
October 4, 2012

English
We found it hard to understand why Randy had spoken as rude as he did in response to a simple question. is rude correct or is it rudely and why
October 4, 2012

Eglish
Thanks Ms. Sue
October 2, 2012