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August 23, 2014

Posts by Dan


Total # Posts: 883

algebra
I was wondering if my answer is right. Let f (x)=(x+10)^2. Find x so that f(x)=72 (x+10)^2=72 x^2+20x+100=72 x^2+20x+28=0 x=(-20+-sqrt(400-112))/2 x=-10+6*sqrt(2)
April 25, 2010

algrebra
Solve by applying the quadratic Formula: all radicals should be simplified as far as possible. Show your work. a^2 -12a + 35 =0
April 25, 2010

algebra
Yes you helped me a lot. Thank you for showing me in steps how to solve this question
April 25, 2010

algebra
How do you complete the square by filling in the two blanks so as to produce a true equation. x^2 - 12x + ---- = (x - -----)^2
April 25, 2010

Brain Teaser
When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and ...
April 15, 2010

math
Question from the Classroom: 10 A student claims that the equation Ö(-x) = 3 has no solution, since the square root of a negative number does not exist. Why is this argument wrong?
April 13, 2010

math sets
Explain whether the set {0, 1, 2} is closed with respect to addition on whole numbers.
April 13, 2010

math 213 #18
A student claims that every prime greater than 3 is a term in the arithmetic sequence whose nth term is 6n + 1 or in the arithmetic sequence whose nth term is 6n – 1. Is this true? If so why?
April 13, 2010

Math 213
Examine several newspapers and magazines and describe at least three examples of functions that appear. What is the domain and range of each function?
April 13, 2010

Chemistry
Identify the balanced net ionic equation for the reaction 2Na3PO4(aq) + 3CaCl2(aq)¨ 6NaCl(aq) + Ca3(PO4)2(s)
April 8, 2010

Chemistry
How many moles of NaBH4 are needed to generate one mole of B2H6 if the reaction gives an 80% yield? 3NaBH4 +4BF3 ¨ 3NaBF4 + 2B2H6
April 8, 2010

Chemsitry
What is the phase of a compound at 600 mmHg and 32oC if it melts at 35oC when pressure is 760 mmHg? Its triple point occurs at 200 mmHg and 36oC.
April 8, 2010

Chemistry
How many moles of PCl3 can form from a mixture of 5 mol of P and 6 mol of Cl2 according to the equation 2P + 3Cl2 ¨ 2PCl3
April 8, 2010

Chemistry
Alum is a hydrated compound containing 45.5% water. How many moles of water are contained in one mole of this hydrate. Data for alum M= 474 g∙mol-1
April 8, 2010

Algebra 2
it says (3i*ã5)2
April 1, 2010

Algebra 2
Thanks Reiny How ado I simplify? (3iã5)^
April 1, 2010

Algebra 2
Can someone help me with this?? Simplify... ã-45 x ã-20 = is it?? ã-45*-20 ã-900 3ã-30
April 1, 2010

ice cream
Suppose you have a friend named Ed. He and his four friends are having ice cream. There are only three flavors available at the ice cream store they are visiting: chocolate, vanilla, and strawberry. One of Ed’s friends, Stacey, eats chocolate exclusively. How many ...
March 30, 2010

math
A drawing of diagonals for four different polygons is listed below. What is the number of diagonals for a 100-sided polygon?
March 30, 2010

solving polynomial equations
thanks and one more thing -4=c-3/6-1-c/8+c/12
March 27, 2010

solving polynomial equations
please help 3(n+1)=5(n-3) thank you
March 27, 2010

4th grade math
R^2 + R^2 + 16R + 64 = 144 solve for R.
March 25, 2010

math
Convert the polar equation r-3cosx = 5sinx in Cartesian equation form.
March 22, 2010

math
How do you convert polar coordinates to Cartesian coordinates? And vise versa.
March 19, 2010

trig
How do you convert polar coordinates to Cartesian coordinates? And vise versa.
March 19, 2010

math
Two forces of 7 lb. and 14 lb. act on a body at right angles to each other. Find their resultant. Find the angle their resultant force makes with the force of 14 lb.
March 17, 2010

math
According to Sal's map he is is 6 units away from the grocery. The grocery store is 5 units away from the coffee shop. The coffee shop is 1 unit away from Sal's house. How is this possible?
March 16, 2010

Chemistry
Which test for iron(II) ions is conclusive?
March 16, 2010

Duval
Explain the importance of understanding inventory valuation methods in dertermining the quality of the profit
March 9, 2010

Physics
7.8hz
February 26, 2010

English
Midsummer Night's Dream: The fourth act opens with Bottom at center stage. What is your opinion of Bottom's character? How might he be the antithesis, or opposite of Theseus's character?
February 15, 2010

math
Examine three elementary schol textbook and report on how the introduction of the topic of GCD and LCM differ in the diffrent textbooks?
February 9, 2010

Chemistry
An element has bcc packing with a body-centered cubic unit cell. Its density is 19300 kg/m3 and the unit cell volume is 3.17 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures. The element rubidium has bcc packing with a body-centered cubic...
February 8, 2010

Finance
I need to identify the ROI and NPV of the wireless order-tracking system. Here is the information it gives me: - The aquisition cost is $35,000 paid at the time of installation. - It reduces the wait staff by one person: Figure $10 per hour, or 2020 hours per year + 18% ...
February 5, 2010

US History
I need to pick a term paper topic involving American History. I want to do something about a controversy during a war time, but I don't know what to pick. Maybe something during the Vietnam War or the Gulf War? Where could I find thesis ideas or do you have any suggestions?
February 3, 2010

Geometry.
A spherical water tank has a diameter of 10 feet. How much water does it hold when half full (use 3.14 for , and round to the nearest hundredth)?
January 24, 2010

Trigonometry
If the sine of an angle is 3/5 and the angle is not in quadrant 1, what are the remaining five trigonometric values for that angle?
January 24, 2010

Math
How would you graph the inequality x > -5
January 24, 2010

Math
How would you graph the inequality x > -5
January 24, 2010

science
I AM IN YEAR THREE I NEED SOME HELP IN MATERIALS (SCIENCE)
January 4, 2010

geomitry
a sperical water tank is being filled with the diamiter of 10 feet how much water does it hold half full use 3.14
December 15, 2009

critical thinking
how will thinking critically influence the way I read? how will thinking critically influence the way I write? how will thinking critically influence the way I process information?
December 9, 2009

sci275
how can the government be involved in conservation efforts?
December 8, 2009

chemistry
An engine goes through the following cycle with 2.60 moles sample of a diatomic gas. I. an isothermas expansion from point a to point b. II. a constant pressure compression from point b to point c. III. an adiabatic compression from point c to point a. We are given point a has...
December 7, 2009

chemistry
An insulated beaker with negligible mass contains liquid water with a mass of 0.255{kg} and a temperature of 76.0{C} How much ice at a temperature of -19.9 C must be dropped into the water so that the final temperature of the system will be 32.2? Take the specific heat of ...
December 7, 2009

HCA220
I answered several question for an assignment and I need help to understand how I got it wrong. The assignment dwelt medical terms. The following three were marked wrong. Please help! Use the word bank below to build the medical word that corresponds to each definition in ...
November 30, 2009

environmental science
can you name one terrestrial resource issue?
November 29, 2009

environmental science
why is sewage a problem and how have human activities contributed to this problem?
November 20, 2009

Chemistry problem
What is the expected freezing point of a 3.50 m aqueous solution of BaCl2 (Kfp=1.86C/m)? What is the boiling point (Kbp=0.512C/m? & which is affected to the greater extent, the boiling point or the freezing point?
November 12, 2009

Simple Chem Help
fill in the blank. The freezing point of a solution is_____ and the boiling point is ___________ than that of a pure solvent. lower...higher?
November 12, 2009

calculus
Water is leaking out of an inverted conical tank at a rate of 60000 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 90 meters and the diameter at the top is 40 meters. If the water level is rising at ...
November 10, 2009

Chemistry
I thought I put it as soluble, because I broke it up to 2Ti+(aq)and SO42–(aq. Correct me if I'm wrong. Is the rest okay?
November 7, 2009

Chemistry
Could some please tell me if I did these problems correctly? (I know that I did not Cancel common aqueous ions yet) Question: Write the net ionic equation for the following 1)Mixing solution of barium acetate and sodium phosphate 2)Mixing solution of thallium sulphate and ...
November 7, 2009

Physics
hahaa.. funny. I had to show the calculations for each step. So are you suggesting that I just state that this proves the Conservation of Energy?
November 6, 2009

Physics
This is a four part question, I need help with the fourth part. 1. I found the Gravitational Potential Energy of a gymnast at her maximum height above a trampoline to be 400J. 2. I found the Kinetic Energy of her just before she makes contact with the trampoline to also be ...
November 6, 2009

5th grade
4/5-7/8/10-7/10+1/2=6/10+1/5=8/10
November 6, 2009

college physics
A 190 g air-track glider is attached to a spring. The glider is pushed in 9.8 cm and released. A student with a stopwatch finds that 14 oscillations take 18.5 sec. What is the spring constant?
October 30, 2009

algebra
7.3xgreater than or less than -87.6
October 27, 2009

pre-algebra
mr conner's students made kites in science class. he brought a 500-yd bolt of twine to tie to the kites. if he wants to give each student a piece of twine 331/3 yards long. what is the maximum number of pieces of twine mr. conner will be able to make from the bolt of twine?
October 27, 2009

pre algebra
w+9/14 greather than or equal to 5/14
October 27, 2009

pre-algebra
-1.04
October 27, 2009

pre-algebra
x/-2.5<-1.54 solving ineualities with rational numbers'---how do i do this?
October 27, 2009

science 8th
give an example of a chemical formula.
October 27, 2009

math
5^6-2=
October 25, 2009

college
A proton is traveling to the right at 2.5×10^7m/s . It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What are the speeds of each after the collision?
October 18, 2009

physics
Ball 1, with a mass of 100g and traveling at 12 m/s , collides head on with ball 2, which has a mass of 340g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic? What are the final velocities of each ball if the collision ...
October 18, 2009

math
how do i simplifu 2r^2 +r +r^2 and 3(r+s) - 2r
October 17, 2009

English
Selfish in a sense that most of us fall upon reacting against the injustice of the world upon reacting against the injustice of the world. should there be an "s" at the end of fall?
October 15, 2009

lit
how do you convert mg/ml to mg/100mol
October 14, 2009

physics
A 1100 kg sports car accelerates from 0m/s to 33m/s in 13s What is the average power of the engine?
October 12, 2009

physics
An elevator weighing 2400 N ascends at a constant speed of 5.0 m/s. How much power must the motor supply to do this?
October 12, 2009

physics
What minimum speed does a 150g puck need to make it to the top of a 3.6m -long, 23 degree frictionless ramp?
October 12, 2009

physics
How much work must you do to push a 13 block of steel across a steel table at a steady speed of 1.3 for 3.7 ? what is the Wnet and P?
October 12, 2009

physics
A 710 kg car drives at a constant speed of 23m/s . It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car (a) on level ground? (b) up a hill with a slope of 2.0?
October 12, 2009

physics
With what minimum speed must you toss a 160 ball straight up to hit the 15 -high roof of the gymnasium if you release the ball 1.7 above the ground? Solve this problem using energy.
October 12, 2009

11th grade
An improper fraction is usually something over something. The numerator in a improper fraction is usually larger than the denominator. =10*12+5/12 =125/12 =31/3
October 10, 2009

Alg
I have to simplify this: (y^(1/4)*Z^4)^(-4/5) My answer: (2z)^(1/2)/4z^4 Correct? Simplify (3-2SQRT2)(SQRT6-5) I have no idea how to foil this one.
October 9, 2009

Algebra
I have to simplify this: (x^(1/2) * z^(-4/5)^4 My work: x^2/z^(16/5) Correct? Simplify (3+5SQRT2)(4+SQRT10) I have no idea how to foil this one.
October 8, 2009

Physics
My Prof. used the equation ---- (G*Me)/((Re+h)^2)=g' He said to solve for h which is what I did but it didn't work. Suggestions?
October 6, 2009

Physics
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 7.0×10−3 less than that at sea level. What is the observatory's altitude?
October 6, 2009

Physics
A 300 ball swings in a vertical circle at the end of a 1.2-m-long string. When the ball is at the bottom of the circle, the tension in the string is 13 . What is the speed of the ball at that point?
October 6, 2009

biology
what can be a represent as a necleus in a room. and WHY
October 5, 2009

SraJMcJin
Hello, I was wondering if you could read my essay and tell me what you think i could do to improve on it. The problem is, I do not want to put it on the internet, so is there a way I can email you my essay?
October 5, 2009

algebra
(4c+2)+(5c) = 92 9c + 2 = 92 9c = 90 c = 10 So there are 10 chairs in each row Alexi set up a total of 42 chairs including the extra 2. Martin set up a total of 50 chairs. 42-(2*4) + 50-(2*5) = ?? 92 - 18 = ???
October 4, 2009

English+Essay
Also whats a good way to end your paragraphs? do i just restate what i wrote?
October 4, 2009

English+Essay
If I start the introductory paragraph to: As a candidate for National Honor Society membership, I believe that I exemplify the high standards expected of its members. Would I need to add on more to it to make it a little bit longer? I was thinking about adding this to it: I ...
October 4, 2009

English+Essay
I have to write an essay, but I have no idea how to start it. It says that my essay has to be MLA formatted, and only 3/4 to 1 page long. 2 page is the longest it can be and must be double placed. Using MLA format, there's is no way for me a write a proper essay with that ...
October 4, 2009

math
There are two machines that produce aluminum cans. The newer machine can produce 7200 cans in 200 minutes. It takes the older machine 300 minutes to produce that many cans. If the two machines work together, how long will it take them to produce 7200 cans? i did 200x+300x = ...
October 1, 2009

math
The length of a rectangle is four times its width. If the perimeter of the rectangle is 50cm. find its area. how do i set this up?
October 1, 2009

math
Justin's gas tank is 1/4 full. After he buys 9 gallons of gas, it is 5/8 full. How many gallons can Justin's tank hold? How would i set that up?
October 1, 2009

math
1. Jina purchased a prepaid phone card for $15. Long distance calls cost 11 cents a minute using this card. Jina used her card only once to make a long distance call. If the remaining credit on her card is $11.04 , how many minutes did her call last? I got 3.96 minutes is that...
October 1, 2009

social studies
a big one. as one might expect whensomeone moves into you bnackyard with tyechnology youve never seen
September 19, 2009

AP English
well, first, God is someone to be afraid of, although loves and thanked too, for pouring his wrath for sinners on His son who died willingly, saving and covereing the sins of anyone who beleives in Him... (this is because Lincoln was a christian..) other than that, its really ...
September 19, 2009

math
ur answer is odd numbers welcome for noing da awnser(:!!!!! WELCOME EVERYONE!!!!!
September 17, 2009

math
yay :p thanks
September 5, 2009

math
(4)^2(8) - 12 (16)(8) - 12 128 - 12 = 116 ??
September 5, 2009

math
can you check if answer is right? a^2b -c when a=4 b=8 and c=12
September 5, 2009

Math
typo # 4 answer = -5,9
September 1, 2009

Math
Hello I did my math homework, but I need someone to check if I did it right or not. 1. A = z>=4 B = z<7 Write A or B and A and B using interval notation Answer: A or B = (-infinity, infinity) A and B = [4,7) 2. Write the algebraic expression for the following: 8 is less ...
September 1, 2009

physics
I can't fully understand Fermat's principle of least time (the modern version)
July 27, 2009

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