Monday
February 20, 2017

# Posts by Devin

Total # Posts: 187

chemistry
Lewis dot of free radical cf2cl and hoco
December 5, 2011

chemistry
Lewis dot of free radical cf2cl and hoco
December 5, 2011

chemistry
The average out door concentration of carbon monoxide ,co at 15 c and 1 atm of pressure is about 900 micrograms per cm^3 . What is this concentration expressed : on ppm scale ? And on the molecules /cm^3scale?
December 5, 2011

chemistry
Ln(100)/1)=(0.693/t^1/2)(t). ??? Don't get it
December 5, 2011

chemistry
Sorry don't understand it is 99 percent
December 5, 2011

chemistry
If the radiicativr decay of nuclear explosion contains 90 Sr , with a half life of 28.1 years how long will it take for 99 of this radioaioot to decay
December 5, 2011

chemistry
How many grams of na cl are required to make 500ml of a 0.65 percent w/v
December 5, 2011

Algebra1
A CELL PHONE ORDDERS 500 NEW PHONES FROM A MANFACTURE.IF THE PROBABLITY OF A PHONE BEING DEFECTIVE IS 2.6% PREDICT HOW MANY OF THE PHONES ARE LIKELY TO BE DEFECTIVE.ROUND TO THE NEAREST WHOLE NUMBER
December 5, 2011

Engineering
A 2kg piece of gold metal at 90 C is placed in 5 liters (=5kg) of water at 30 C. Determine the final temperature (Tf).
November 16, 2011

math
Please show me the steps to solve this problem: The total shipping weight of two crates is 358 pounds. One crate weighs 124 pounds more than the other. What does eah crate weigh?
October 12, 2011

Math
explore the significance of the coefficient "a" in determining the shape of the graph of y=a|x|.[
October 5, 2011

Math
explore the significance of the coefficient "a" in determining the shape of the graph of y=a|x|.[
September 13, 2011

english
Crossword puzzle Try to have_________ in length and form of your sentences. 7 letters
August 9, 2011

english
Crossword puzzle Substitute lively__________ for boring, "tired" words. Has 7 letters
August 9, 2011

social studies
I need information on Obama's budget proposal and the House's budget proposal to compare and contrast. I am having trouble finding valid, easy-to-access information on both sides. Help please?
May 24, 2011

math
what does method mean
May 23, 2011

College Algebra
I figured it out. 40 minutes. Thanks anyway
March 30, 2011

College Algebra
Charlie can grade exams in 2 hours. It takes Mark 6 hours to grade the same exams. If they work together, how long will it take for them to grade the exams?
March 30, 2011

Calculus
I'm supposed to find the volume of this, I've tried it multiple times. I can't seem to get one of the possible answers. y=x+2, y=16-x^2, x=-2, x=2 A. 50.67 B. 51.67 C. 8.44 D. 16.89 E. 101.33 F. 152 Thanks for any input!
February 24, 2011

Physics
An Atwood's machine consists of masses m1 and m2, and a pulley of negligible mass and friction. Starting from rest, the speed of the two masses is 3.80 m/s at the end of 3.16 s. At that time, the kinetic energy of the system is 77.0 J and each mass has moved a distance of ...
February 24, 2011

Calculus
So, I need to graph (with my calculator) this out, and then find the area, and finally the volume. y=(x-1)^1/2, y=0, x=2, x=5; about the x-axis I ended up with some crazy answer like 15π/2, and I believe that's incorrect (but it might be right, idk). Any input?
February 17, 2011

physics
A 6.15 kg block slides 1.49 m down a frictionless incline that makes an angle of 60.0° with the horizontal. What is the total work done on the block
February 17, 2011

Math
When the waiter was asked to slice the 16-inch (in diameter) pizza into exactly 4 slices of equal size, he decided to do so using concentric circles rather than radial slices. Determine the radii of each of the three cuts he had to make.
February 14, 2011

Math
Let f(x)=ax^5+bx^3+cx+9, where a,b, and c are constants. If f(6)=17, determine the value of f(-6).
February 14, 2011

Math
Three brothers divide 17 candy bars. The oldest child gets 1/2, the middle child 1/3, and the youngest child 1/9. So that they do not have to cut any bars, Mom provides an extra one. The oldest child then takes 9 candy bars, the middle child 6, and the youngest 2, and they ...
February 14, 2011

Math
The letters A,B,and C represent three different digits. Determine the number ABC if ABC + ACB ---------- BCA
February 14, 2011

physics
A 70 kg painter is painting the wall of a building. He stands on a horizontal board of length 4.7 m and mass 15 kg, suspended from vertical ropes attached to each end. If the painter stands 2.0 m from one end of the board, what would the tensions in the ropes be? Near rope: ...
December 11, 2010

ms. dixon
December 7, 2010

AP Chemistry
What is the structure for PCl3Br2 and 3 isomers?
November 19, 2010

Geometry
If the length of arc of measure 80 is 12 pi inches long, find the radius of the circle
November 17, 2010

Chemistry
Vinegar is a solution of acetic acid (C2H4O2) in water. Its concentration is 5.0%(w/w) and its density is 1.01 g/mL. That was the information given before the question, then it asked for the molarity of vinegar and I got .84mol/L
November 16, 2010

Chemistry
How many milliliters of pure acetic acid (density = 1.05 g/mL) would be required to prepare 1.00 L of the solution?
November 16, 2010

physics
A pendulum has a length of 1m. What is the period of this pendulum? What is the frequency of this pendulum? You measure the period of a pendulum and get 25s. What is the length of the pendulum?
November 8, 2010

physics
If a 0.1 kg mass is suspended at rest from a spring near the Earth's surface, the distance that the spring is stretched is measured to be 1.0 cm. What is the spring constant of the spring (remember the MKS units)? A mass of 2 kg is attached to a spring with constant 18 N/...
November 8, 2010

Psychology ; the mind at work
1.)C 2.)D 3.)B 4.)D 5.)C 6.)A 7.)B 8.)B 9.)A 10.)D 11.)C 12.)D 13.)C 14.)A 15.)A 16.)D 17.)B 18.)B 19.)B 20.)C
October 21, 2010

Chemistry
What is the percentage yield for a reaction if you predict the formation of 21 grams of C6H12 and actually recomvered only 3.8 grams? is the answer 18% 3.8g/21g x 100% pls verify.
October 17, 2010

physics
ok i wont have time this is due at 1
October 13, 2010

physics
ok so its 15.53 n
October 13, 2010

physics
The final formula should read FinalKE= InitialKe-ChangePE-Wfriction hope this helps anyone doing this problem for homework!
October 9, 2010

North & Central America
what are two ways to describe a location
September 8, 2010

math
After many attempts and variables, I came up with this: You start off with 3x5=15 Then, square the 6=36 Add 15+36=51 Take 51+54 which equals 105 and lastly, 105 minus 5 equals... 100!
August 30, 2010

child development AED 202
Do you know of any health issues that may be different between early and middle childhood? They actually have to be put on two different slides.
June 26, 2010

child development AED 202
Thank you so much for the suggestions.
June 26, 2010

child development AED 202
I have my powerpoint presentation all set up. I am just having a hard time with health issues that are appropriate to each developmental issue. The assignment wasn't clear as to what kind of health issues and I don't know how these issues would differ between the two ...
June 26, 2010

child development AED 202
develop a presentation for early childhood and middle childhood groups that addresses health issues appropriate for each developmental level
June 26, 2010

chemistry
h2SO4(aq)+2NAOH(aq)--->NA2SO4(aq)+2H2O(L) how to solve this
May 31, 2010

pre-cal
g(x)=-4/x; x=-5, x=-5+h Determine the average rate of change of the function between the given values of the variable.
April 27, 2010

algebra
how would solve this math question 5/8x - 6 3/8x = 1 1/2
April 14, 2010

algebra
2. As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. a. The sales representative here tells you they also have two floor plans available, but they only have 38 homes still for ...
March 31, 2010

algebra
1. Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city. a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan ...
March 31, 2010

social studies
green eggs and ham
March 24, 2010

Chemistry
Which of the following are correct symbols and charges? Could be as many as 5. 1. Na- 2. Ag+ 3. O2- 4. Ag- 5. NO3- 6. Cu2+ 7. F+ 8. Cl2-
March 21, 2010

psychology
Explain how having a negative self-schema affects one’s social interactions. How does social intelligence affect one’s responses in any given situation? How might a person’s self-guides impact his or her perspective on the world?
March 19, 2010

math
Short projectile motion question A German rocket from the second world war had a range of 3000meters reaching a maximum height of 1000meters. Determine the rockets maximum velocity
March 12, 2010

math
one side of a right triangle has 2cm less than the hypothuse, and 7cm more than the third side what is the lenghnt of each side
March 12, 2010

math
why did the indian wear feathers in his hair
March 2, 2010

the distance of a region north or south of the equater in degrees is called?
February 9, 2010

geometry
UR MOM
December 1, 2009

physics
estimate the rotational kinetic energy of earth, assuming it to be a solid sphere of uniform density
November 28, 2009

Com 140
How would you approach a classmate to recive more info about the assignment using tone, audience, content and purpose?
November 5, 2009

Social Studies
How are the natural resources of the Northeast led to jobs for the New Englanders?
October 14, 2009

Spanish
What is wrong with the statement? El va de Miami a Buenos Aires. Esta tomando un vuelo nacional.
September 15, 2009

math
explain how to write20 over 40 as a unit rate
September 9, 2009

math
explain how to write20 over 40 as a unit rate
September 9, 2009

tech 2
factor x^2+10x+9
June 5, 2009

math
what is greater 2 feet or 26 inches
February 23, 2009

weather/science
I had to create a chart of air temperature, pressure, and was the pressure rising or falling. One of my questions about it is "were there any values that you could predict ahead of time?" can someone help me with this question please?
February 22, 2009

math
what is the meaning of mean median mode range
February 10, 2009

Algebra 1
9x-8y=42 4x+8y=-16
February 3, 2009

fort wayne evansville south bend
January 25, 2009

MATH
x-4=3x+12 -12 -12 x-16=3x -x -x -16=2x x=-8
December 9, 2008

Math
i have that worksheet, on the first one you need to divide 174/3 the second one divide 6.30/6
October 19, 2008

math
September 24, 2008

Animal Farm
give me an example for a hyperbole
August 26, 2008

Physical Sciance
Calculate the density for a rectangular block using the following measurements, Length: 2.70cm, Width:1.10cm, Height: 9.09cm, Mass: 72.17g. Round your answer for density to 2 decimal places. Include the correct unit for density.
February 26, 2008

Economics
In a regression analysis, suppose there is, in fact, no seasonal pattern to sales, and the trend line is estimated using dummy variables to account for seasonality. What effect would this have on the estimation? My guess is that it wouldn't affect the estimation....am I ...
January 29, 2008

science
If 8 paper clips are placed on one side of the balance 2 cm from the fulcrum,where should 4 paper clips be placed on the other side?
January 2, 2008

Abstract Algebra
Let H={a+bi a,b is a element R, a^2+b^2=1} be a subset of the non zero complex numbers C*. Prove that H<C* under complex multiplication using the one-step subgroup test. Also describe the elements of H geometrically.
December 7, 2007

Biology
I need help with classification Organism Kingdom Phylum Class Order Family Genus Species Crabs (Hermit and Fiddler) Animalia Arthropada Mussel Animalia Mollusca Shrimp Animalia Arthropada Fish (Striped Bass) Animalia Chordata Jellyfish Animalia Cnidaria Sea Weed Plantae I need...
September 30, 2007

science
used for first focusing on a microscope
September 19, 2007

pre-cal
to find the distance AB across a river, a distance BC= 309m is laid off on one side of the river. It is found that B= 105.4 degrees and C= 12.2 degrees. Find AB To find the distance AB across a river, a distance BC= 309m is laid off on one side of the river. It is found that /...
June 5, 2007

math-ish
What words does tcnaio make unscrambled? Try these: http://www.ssynth.co.uk/~gay/anagram.html http://wordsmith.org/anagram/ http://www.unscramble.net =) action atonic tonica cation
May 23, 2007

Algebra 2
I need help-exam tomorrow! Although it is too late for your exam, in the future, we need specifics to provide help plus time to respond. We are volunteers and are not available 24/7. I hope this helps you in submitting future questions. Thanks for asking.
May 22, 2007

physics
1- a pipe of diamter 1cm carreiers water flowing at 1m/s. the end of the pipe is bplugged and there is a small holeon the top as shown which is 1mm diameter. How high does the water go? *=hole ()____________*___() 2. you're indoors, with a door 1m wide and 2.5m high. the ...
December 5, 2006

making dot arrays
What do we call the numbers that cannot be arranged into 2-row arrays?
August 21, 2006

science