Tuesday
February 9, 2016

# Posts by Mark

Total # Posts: 1,467

calculus
Let C be the curve which is the intersection of the half-cone S1 = {(x,y,z)|z=sqrt(x^2 + y^2} and the paraboloid S2 = {(x,y,z)|2z=3-x^2-y^2}. Find C. a)Make a 3-D sketch to show S1, S2, and C b) Show that at each point on C the normals to these two surfaces are perpendicular ...
October 5, 2008

geography - weather and climate
i need to draw a labelled diagram and explain why depressions bring cloud and rain. do you know any good sites that would help me and explain it simply for me to understand. thanks!
October 4, 2008

math
Mr.Jackson is preparing bags of treats to give trick or treaters on Halloween. He has 48 pieces of candy and 60 pieces of gum.He uses all the candy and gum, and he puts the same ratio of candy to gum in each bag. What is the largest number of bags he could have made.
October 1, 2008

calculus
Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@, obtain an integral ...
September 22, 2008

Calculus
Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@, obtain an integral ...
September 22, 2008

calculus
Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@, obtain an integral ...
September 21, 2008

calculus
wow thx a lot man
September 20, 2008

calculus
the path of a particle in the xy-plane is vector r = (cos2t, sint) for t for all [-pi/2, pi] where t represents time. Sketch the path. Is it a smooth curve? How do i sketch the path? do i just plug in random points between [-pi/2, pi]? how would i connect it together? and how ...
September 20, 2008

Calculus
the path of a particle in the xy-plane is vector r = (cos2t, sint) for t for all [-pi/2, pi] where t represents time. Sketch the path. Is it a smooth curve? How do i sketch the path? do i just plug in random points between [-pi/2, pi]? how would i connect it together? and how ...
September 20, 2008

calculus
A particle traces the path vector r = (t^3, t+3, t^2 -4t) where t represents time; it flies off on a tangent when t=1 and then moves in a straight line with constant speed. Find its position when t=4. Do I just plug the 4 into the t's in vector r?
September 20, 2008

college
Find limit X approaches 1 for ((5-X)^.5 -2)/((2-X)^.5 -1) e-mail address: mark.hultgren@ca.usda.gov Thank you.
September 15, 2008

HELP!
WHY ARE GAS PRICES RISING?
September 6, 2008

Calculus
a) Prove that |A|^2 = A•A for every vector A. (Note, the A's are vectors) b)Use this to show that if |F(t)| is constant for t for all (a,b), then F'(t)•F(t) = 0 for t for all (a,b). (Note the Fs are vectors)
September 6, 2008

Algebra Help
1. You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a$38,250 small business loan. These loans must be repaid in full within 10 years. a) What ...
September 4, 2008

health
health concerns fron 1990 to 2010 for 9th grade heath class homework
September 4, 2008

Calculus I
This post was also placed at freemathhelp, on the calculus board with titled, "Calculus I". No work is shown at either location. Sad.
September 2, 2008

cultural diversity
Women are considered the social minority in the United States because they belong to this group, and are sometimes subject to prejudice and discrimination
August 28, 2008

Math
1.)Write the ratio of 20 to 18 in lowest terms 2.)Find the supplement of <A. m<A =72 degrees. 3.)Place the following numbers in ascending order. -2/5, 1/6, 7/8, -5/9, 3/4
August 18, 2008

Math
A=30?
August 18, 2008

accounting
a credit to the overhead account
August 12, 2008

Marketing
I am writting a marketing plan essay and need to describe sales support but I cannot find a clear definition to start from. Help?
July 31, 2008

Organization Behavior
Thank you
July 19, 2008

Organization Behavior
what is a customer base description?
July 19, 2008

Physics
A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is its acceleration? A. 0.21 B. 0.46 C. 0.64 D. 0.78 E. 0.97 acceleration= change in velocity/change in time and the velocity= change in displacement /change in time Velocity=28...
July 16, 2008

Physics
Displacement is which of the following types of quantities? A. vector B. scalar C. magnitude D. dimensional My answer is A. vector...I just want to confirm this is the correct answer.
July 16, 2008

religion
consider the interrelatedness of everything in the cosmos as it is expressed in many indigenous religions. How do you think the importance of these relationships developed? What spiritual purpose do you think they serve for indigenous peoples?
June 17, 2008

SOCIAL STUDY
WHY SHOULD WE GO TO A FILED TRIP.
May 27, 2008

geometry
Find each side's area then add them up Do you know the formulas for the areas of a triangle and a rectangle?
May 27, 2008

Physics
I don't necessarily need an answer here... just a step in the right direction. If you drive into a wall at 5 m/sec, rebound at 1 m/sec, and make contact with the wall for .15 sec, with what force did the wall exert on the car? (mass = 220 kg) I can't really put my ...
May 27, 2008

Algebra
Think about it this way: 3 < 6, so would -3 < -6? No, -3 > -6. No, it doesn't change because an equation by definition is not an inequality.
May 26, 2008

gen 105
How Do You Create A Table That Lays Out A Day-by-day Plan To Use As A Job Aid For Employment Search, Spanning 3 Weeks?
May 21, 2008

What is the relevance of international strategy to businesspeople
May 17, 2008

chemistry
Describe the role of each of the following types of bonds in a polyamide: a) covalent bonds b) amide bonds c) hydrogen bonds
May 10, 2008

Math - Trig
Hi I have a Trig question that i dont understand, can someone please explain how to solve for it using cosine law?? A Clock with a radius of 15 cm has an 11 cm minute hand and a 7 cm hour hand. How far apart, to the nearest centimetre, are the tips of the hands at each time? a...
April 30, 2008

marketing
April 17, 2008

Vending Machines
How does Vending machine connect to our culture and customs?
April 16, 2008

Algebra
A carpenter drills 5 equally spaced holes in a 56 3/4" long piece of wood. The two end holes are an equal distance from the center. If each hole is 7 1/2 inches apart, what is the distance from each end of the wood to the nearest ens hole? Please explain Thanks, Mark
April 15, 2008

Algebra
Brett made muffins for his grandmother, but he gave his friend Steve 1/8 of the muffins. Then Brett saw Dori and gave her 1/3 of what he had left. Then he saw Shiela and gave her 1/7 of what he had left. By the time he arrived at his grandmothers house there were only 12 ...
April 15, 2008

algebra
The 2842-seat performing arts center has three sections-orchestra, mezzanine, and balcony. The mezzanine has one-sixth fewer seats than the orchestra. How many seats are in the balcony if the orchestra has 1,218 seats? Please show me how to set up the equation.... thanks
April 15, 2008

algebra
Im feeling like an old parent. Please help. Charles is one-third as old as his father. In six years, Charles will be three-sevenths as old as his father. If Charles is less than 18 years old, how old is Charles' father?
April 15, 2008

math
Factorise completely: 1)3g-3t+2mg-2mt 2)3x squared + 2x-8 3)3x squared-27
April 7, 2008

Science
I am trying to find examples of how the human body uses diffusion and osmosis. I have tried searching using various combinations, but have been unable to find any examples. Any suggestions on where I might look to find examples? Thanks
April 6, 2008

math
Hi i need help on solving this question. The population, P(t) of a city is modelled by the function P(t)=14t^2 + 650t + 32000 When will the population reach 50000? I want to know what we are looking for, and how to get to that answer. Tnx
April 3, 2008

functions
hi i was wondering what would be the domain and range restrictions that to the function f(x)=(-1/3)x^2+8, and how to find them, because i dont get it. tnx
March 17, 2008

Science
wind,waves,running water.
March 5, 2008

latin
ei spectant pueros in illos ludo
March 3, 2008

Physics
I have tried to solve this problem in multiple ways, but i keep getting it wrong please help A 48.0 {\rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 1.50 turns each second. The distance from one hand to the other ...
March 3, 2008

Chem
How many moles of copper sulfate, CuSO4 are in a o.671 g sample? How do I start on this?
March 3, 2008

Chem
So the charge for the tartrate anion is -2......But is it possible for me to figure that out with the formula itself? Or is it something that I have to look up.....I saw the link...
March 3, 2008

Chem
What is the formula mass in amu of KNaC4H4O6 *4H2O Is it 282.09 amu? What is the charge on the tartrate anion? How do I do this?
March 3, 2008

prefix and suffix
when you_________ somthing you give it beuty im in 6th grade awnser fast please
March 2, 2008

Math- consecutive intigers
500000000 * 5555555=?
February 18, 2008

Chemistry
How much volume in liters will 100.0 grams of oxygen occupy at 100 degrees celcius and 100 atm pressure?
February 15, 2008

chem
delta T = Kf*molality Plug in 5.00 C for delta T, 1.86 for Kf and calculate molality. Then molality x kg solvent x molar mass = grams. You know molality, kg solvent, and molar mass. Calculate grams. molar mass? where did u got the molar mass from ?
February 5, 2008

chem
delta T = Kf*molality Plug in 5.00 C for delta T, 1.86 for Kf and calculate molality. Then molality x kg solvent x molar mass = grams. You know molality, kg solvent, and molar mass. Calculate grams. molar mass? where did u got the molar mass from ?
February 5, 2008

chem
How many moles of ethylene glycol must be dissolved in 500 g of water (Kf = 1.86) to lower the freezing point to -5.00 0C?
February 5, 2008

math
Consider the following binomials. A=(x^2+5x) B=(6x+30) Part 1: Factor each binomial by finding the GCF. Then, add the two factored binomials to make a single expression. Part 2: Now add the original forms of binomial A and B together to make a trinomial. Factor the trinomial. ...
February 2, 2008

math
Consider the following binomials. A=(x^2+5x) B=(6x+30) Part 1: Factor each binomial by finding the GCF. Then, add the two factored binomials to make a single expression. Part 2: Now add the original forms of binomial A and B together to make a trinomial. Factor the trinomial. ...
February 2, 2008

math
When a figure is drawn in quadrant 2, and you reflect it over the x axis, do you reflect in quadrant 1 or four? I think you reflect it in quadrant 4. Also, where would you reflect it over the x axis when the original figure is in quadrant 1? And y axis?
February 2, 2008

math
Consider the following binomials. A=(x^2+5x) B=(6x+30) Part 1: Factor each binomial by finding the GCF. Then, add the two factored binomials to make a single expression. Part 2: Now add the original forms of binomial A and B together to make a trinomial. Factor the trinomial. ...
February 2, 2008

math
Simplify the expression 6x x 2x^3 x 3x^2y^2/3x^3 x x^4y. I'm confused. The only thing I did was simplify 3x^2y^2/3x^3 to x^1y^2. I need help with the problem.
February 2, 2008

math
When a figure is drawn in quadrant 2, and you reflect it over the x axis, do you reflect in quadrant 1 or four?
February 2, 2008

math
The old lion cage at the zoo was a square, with sides x meters long. For the part of the zoo's 50 birthday celecration, the zoo expanded the length and width. The expression for the total area of the new cage is (x^2+18x+81) square meters. Part 1:Robert thinks that the ...
February 2, 2008

math
So, do you add the product to 32.25? If so, I rounded the sales tax to 2.34 and added 2.34 to 32.25 and I got 34.59.
February 2, 2008

math
Sneakers were on sale for 25% off their original price. Lola bought a pair of sneakers that had an original price of $43. She also paid a slaes tax 7.25% on the sale price of the sneakers. How much did Lola pay for the pair of sneakers? Round to the nearest cent. So far, I ... February 2, 2008 math Damien sets up a bucket to catch raindrops. The bucket can hold only 1 gallon. If each raindrop is made up of about 1/90 fluid ounceof water, how many raindrops will the bucket be able to hold? I need help with this question. I know that 1 gallon=128 fluid ounces. I need a ... February 2, 2008 English Thanks, I have read it through, it just doesn't all connect so easily for me. I get that the conversation with his mom is important and all, but I don't necessarily see why all the other conversations with people from the Iliad made him learn a lesson. Blech. My brain ... January 27, 2008 English The Odyssey By Homer -- Book 11 What lesson does Odysseus learn about himself? How has it strengthened his resolve to return to Ithaka? January 27, 2008 Earth science a fault is observed in a road cut, but there is no obvious rock units to correlate on either side of the fault to determine relative movement. How might you determine or even infer whether the hanging wall has moved up or down relative to the footwall December 30, 2007 Microeconomics Consider a competitive firm that produces tomatoes. The total fixed costs are$10 and TVC is related to output according to the followin scheduele Quantity TVC 0 0 1 45 2 85 3 120 4 150 5 170 1)Compute ATC and MC 2) What is quantity if P=40 3)what is quantity if P=30 4)What is...
December 11, 2007

Research Paper
My topic was Jim Crow Laws. I have to write a 5 page research paper. ANY criticism would help. This my first one so its pobably very bad. Could you reveiew my first paragraph and my thesis statement: In 1890, a new Louisiana law required railroads to provide “equal but ...
December 8, 2007

calculus
is (x)/(x^2-9) an even or an odd function?
November 19, 2007

chemistry
Rank the following compounds in order of increasing acid strength (1 = weakest, 4 = strongest) HClO HClO3 HClO2 HClO4
November 18, 2007

chemistry...
ah please ignore, i got it!!
November 16, 2007

chemistry...
thanks for the last help, i got the right answer!! i got this wrong... (answer is supposed to be 0.165 but i put 0.0652) A sample of Na2CO3 weighing 0.2863 g is dissolved in 50 mL of water and an endpoint is reached when 32.83 mL of HClO4 has been added. Calculate the molarity...
November 16, 2007

chemistry
ahhh im confused!! Calculate the pH of a solution formed by mixing 372 mL of a solution containing 4.4 x 10-6 M NaOH with 286 mL of 6.0 x 10-2 M NaOH. Report your answer to 2 decimal places.
November 16, 2007

chem
is a formate ion (HCOO-) an acid or a base? how would you know?
November 16, 2007

chemistry
thank you!!
November 12, 2007

chemistry
An aqueous solution of ethanol is 3.05 M in ethanol, CH3CH2OH. Calculate the mole fraction of ethanol if the density of the solution is 0.964 g mL-1.
November 12, 2007

algebra
what if it was something like: 2.038x = 5.381x?
November 12, 2007

algebra
x = 2.077(0.481x) x = 0.999x how would i solve for x?
November 12, 2007

religion
Frankfurter puts together several accounts of monstrous ritual. Account for the similarities between these accounts. HELP
November 10, 2007

Physics
A solid cylinder (radius = 0.150 m, height = 0.120 m) has a mass of 7.00 kg. This cylinder is floating in water. Then oil ( = 725 kg/m3) is poured on top of the water until the situation shown in the drawing results. How much of the height of the cylinder is in the oil?
November 6, 2007

religion--verse explaining
i think it is more profitable to look at all the attributes of spirtual malpractise in given cultures, and when we do so we find a set of oppositions that maintains remarkable consistency as a set, despite variations between cultures. can someone explain what this verse means...
November 1, 2007

Religion--thesis statement help!
Majority is where evil exists and the individual is distinctly evil, and minority is when evil does not exist, rather the actions one does can be considered evil through explanation. i need to write a strong thesis statement agreeing with the minority view
November 1, 2007

religion
Unruly Evil by david pocock can anyone explain to me what is being said in this text. I do not understand it at all, and our prof will not help us understand it either. I need help majorily!
October 31, 2007

Religion
Unruly evil by David Pocok - what does pocock mean by unruly evil? - for pocock, how is evil related to order and to explicability
October 31, 2007

biology
how does cellulose adapt to its function!? i think it has something to do with there being a strong cell wall. however im am unsure. please could somebody help me thanks
October 25, 2007

Geography
Do you feel suburbia is a sustainable way of life?
October 16, 2007

Physics
Cheers bob thats a great piece of kit. Mark
October 13, 2007

Physics
Hi can someone advise whether my methodology is right on this with a potential energy of 589 kJ per tonne, 100 tonnes of water per second are delivered to a turbine. Assuming all the potential energy of this water is used to drive the turbine how much power will be delivered ...
October 13, 2007

Physics
Thanks Bob I had assumed a uk tonne at 1016 kg Mark
October 13, 2007

Physics
Hi Can someone check and advise on this potential energy of 2 tonne of water held 120m above a flood plain by a dam. potential energy = 2032 kg (2 Tonne) x 9.81 ms x 120m pe = 2392070.4 Joules Convert to kilojoules 2392070.4 / 1000 pe = 2392 kJ (To four significant figures) ...
October 13, 2007

Computers
Sort an array of ten 30 character items into ascending order of surname. Each line contains a name in the form e.g. Mr J Smith, Dr John R Smith or John Smith. There are no field or record delimiters, qualifications, suffixes, double-barrelled names or similar complications. ...
October 12, 2007

Mathematics
Four people are standing in a line, each facing forwards. They are not allowed to move, turn their heads or speak (except to give the answer). The fourth is behind a partition wall and can neither see nor be seen by the other candidates. Each is wearing a backpack of unknown ...
October 12, 2007

Science
How do I tell how many electrons are in an element?
October 10, 2007

chemistry
how many moles of x in 33.3g of substance?
October 4, 2007

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