Monday
April 27, 2015

Posts by mark


Total # Posts: 1,301

math
yes. it passes the vertical line test AND the horizonal line test.
December 10, 2008

history
were there other times when the US used the atomic bomb, other than ww2?
December 10, 2008

history
was the US trying to intimidate the uSSR by displaying the power of the atom bomb? why? are there any supporting documents?
December 10, 2008

calculus
find dy/dx of sqrt(x+y)+sqrt(xy)=6
December 8, 2008

Social Studies (specifically American Goverment)
What could be some future challenges for freedom of religion in the 1st amendment?
December 6, 2008

calculus
at a given instant the legs of a right triangle are 5cm and 12 cm long. if the short leg is increasing at the rate of 1cm/sec and the long leg is decreasing at the rate of 2cm/sce, how fast is the area changing
December 4, 2008

Physics
What are some possible uses for gelled methanol and why was it never used as a fuel in transportation?
December 4, 2008

Chemistry
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The product is 180.16gH2O=10....
November 23, 2008

physics
Answer: 39.32746882 meters. How: KE = 1/2massxvelocity^2 = massxheightxaccelerationofGravity. Your velocity is 100km/h = 27.777..., so: 1/2(27.777...)^2 x mass = (385.8024691 m^2/s^2)xmass. (385.8024691m^2/s^2)m = mh(9.81m/s^2). Mass and all units except meters cancel when you...
November 22, 2008

Chemistry
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The product is 180.16gH2O=10....
November 22, 2008

physics
A Calorie with a capital C is 1 kilocalorie. 1c=4.184 J, so 1kc=4,184 J. 235 C X 4,184 J = 983,240 J. 1 W is 1 J/second. Divide 983,240 J by 74 J/s, to get 13287.02703 seconds. Divide that by 3600 seconds/hour to convert to hours. Answer in short: 13287.02703 s = 3.690840841 ...
November 22, 2008

8th Grade
your moms
November 20, 2008

math
In triangle ABC, line AB is congruent to line BC. If m angle A is 45, find m angle B.
November 17, 2008

math
In triangle ABC, angle C is congruent to angle A, line BC=2x-5, line AB=x+5 and line AC=x+10. Find x. The problem didn't have a triangle drawn so i drew it myself. I tried many equations but when i substitute it it didn't work.
November 16, 2008

chemistry
DATA Empty Evaporating dish and watch glass: 33.6g Evaporating dish, watch glass and NaHCO3: 35.08g Evaporating dish, watch glass and product: 34.65 NaHCO3(s) + HCL (aq) ----> NaCl(s) + H2O(L) + CO2(g) 1. Determine the mass if the sodium bicarbonate reacted? 2. Calculate ...
November 13, 2008

chemistry
My answers are 6 and 5 respectively. I'm confident that they're correct, but thanks for your time.
November 9, 2008

chemistry
Sorry, you're right. It is the lowest for the second.
November 9, 2008

chemistry
Atomic hydrogen produces well-known series of spectral lines in several regions of the electromagnetic spectrum. Each series fits the Rydberg equation with its own particular n sub 1 value. Calculate the value of n sub 1 (by trial and error if necessary) that would produce a ...
November 9, 2008

calculus
find the derivative of the function g(x) = (1 + 3x)^6(5 + x - x2)^8
November 7, 2008

social studies
Name Missouri's second largest city which also has French roots
November 5, 2008

Finite Math
Find the value(s) of the function, subject to the system of inequalities. Find the maximum and minimum of P = 10x - 16y subject to: 0 ¡Ü x ¡Ü 5, 0 ¡Ü y ¡Ü 8, 4x + 5y ¡Ü 30, and 4x + 3y ¡Ü 20 50, 0 -96, 0 -67.5...
November 4, 2008

g
doubling time is the time it takes for a country's population to double in number
November 3, 2008

g
Why is doubling time so low in African countries?
November 3, 2008

Books
I am writing a novel, i estimate i will finish pretty soon, within a year or two: I am an Amateur writer- how do i go about trying to publish this book?
October 30, 2008

math
Simplify. 10 lb 30 oz
October 27, 2008

Math
Complete the statement, using a metric unit of weight. A television weighs 30______.
October 27, 2008

math
Box A has 3 red marbles and2 yellow marbles. Box B has 2 red marbles and 1 yellow marble. If you have to pick a re marble to win a prize and you can not look in the box, which box would give you the best chance of winning the prize?
October 22, 2008

math
If you have a rectangle that is 8cm by 6cm and you cut it diagonally, what other 4 geometric shapes can you create
October 19, 2008

Physics
YOu are creating a transverse wave in a rope by shaking your hand from side to side. Without changing the distance that your hand moves, you begin to shake it slower and slower. What happens to the frequency? it decreases?? 2. For incomplete cancellation to occur, opposite ...
October 17, 2008

english
a place where goods are manufactured is called a what?
October 14, 2008

math
Teresa has 4 flower pots in 4 different designs. She likes to display her flower pots in different positions on her window sill. How many different ways can she place her flower pots? Do you 4x4=16 4x3=12 4x2=8 4x1=4 and then 16+12+8+4
October 10, 2008

MATH
I don't think that answer is right. 60 minutes in a hour 72x60= 4320 an hour 24 hours in a day 4320x24=103680 a day 103680x30 days=3110400 a month Then go back and do 103680 a day x365 days a year=37843200 37843200 a year x 72 year=2724710400 Let me know what you think and...
October 9, 2008

calc
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

Calculus-partial derivatives
Let Z = f(u,v) where u=xy^3 + e^3 and v = (x^2)y. Obtain expressions for Zx and Zy in terms of fu and fv. I don't understand the "in terms of" part. How do I do this question? thank you
October 5, 2008

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

physiology
a d d
September 16, 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

International business
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
The answer is actually brick-and-mortar, not offline business
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

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