Friday
October 31, 2014

Posts by mark


Total # Posts: 1,256

social studies
The oldest wonder was built around 2550 B.C. what is it?
August 29, 2007

Critical Thinking
why are you asking for help. Read the assignment and you should be able to come to your own conclusions instead of taking the easy way out. What are you learning if you have to ask for answers? Is this an online course?
August 23, 2007

Math
Hi, how would we solve a problem like this? The path of the ball for many golf shots can be modelled by a quadratic function. The path of a golf ball hit at an agle of about 10 degrees to the horizontal can be modelled by the function : h= -0.002d^2+0.4d where h is the height ...
May 25, 2007

Chemistry
1.Arrange the following oxides in the order of increasing basicity. -Al2O3 -B2O3 -CaO -Ga2O3 -In2O3 -RaO 2.Arrange the following oxides in the order of most basic to most acidic. -Al2O3 -Cl2O7 -Cs2O -N2O5 -Na2O -P2O5 -SO3
April 23, 2007

calculus
The base of a solid is a circle of radius = 4 Find the exact volume of this solid if the cross sections perpendicular to a given axis are equilateral right triangles. The equation of the circle is: x^2 + y^2 = 16 I have the area of the triangle (1/2bh) to be equal to 2sqrt(12...
April 22, 2007

calculus
The base of a solid is a circle of radius = 4 Find the exact volume of this solid if the cross sections perpendicular to a given axis are equilateral right triangles. I have the area of the triangle (1/2bh) to be equal to 2sqrt(12) (1/2 * 4 * sqrt12) I don't know what to ...
April 22, 2007

Math
I'm trying to use DeMoirre's Theorem to compute and express this in rectangular form. Here's the expression: (-1 + i)^5 The ^ means it's to that power. It's to the fifth power. Any help would be appreciated. Figured it out myself. 4 - 4i is the answer.
April 17, 2007

Socail Studies
What 20th-century conflict was dubbed the "forgotten war" despite 54,246 U.S. deaths? That would be Korea... this is an excellent site: (Broken Link Removed) It shou be the The Korean War. You might want to double check.
March 29, 2007

Math
Below are the grades of 50 students on a marketing test.
March 27, 2007

Math
11. (3 pts) The results of a survey for an airline are shown below Traveler
March 26, 2007

Physics
First, you should have appreciated that there is no such thing as negative work (you can't "undo" work by doing work in a different direction). This immediately eliminates answers b and c. The remaining answers rely on your clear understanding of the definition/...
March 26, 2007

Math
In an experiment, a pair of dice is rolled and the total number of points observed. (a) List the elements of the sample space (b) If A = { 2, 3, 4, 7, 8, 9, 10} and B = {4, 5, 6, 7, 8} list the outcomes which comprise each of the following events and also express the events in...
March 25, 2007

PLEASE HELP SOLVE RIDDLE
What is odorless, colorless, weightless. When put in a drum it makes it lighter.
March 23, 2007

PLEASE HELP SOLVE RIDDLE
A Stalagmite
March 23, 2007

chemistry - kinetics
The activation energy for the isomerization of methyl isonitrile is 160 kJ/mol. Calculate the fraction of methyl isonitrile molecules that have an energy of 160 or greater at 500 K? 510 K? What is the ratio of the fraction at 510K to that at 500K? I missed this lesson today ...
March 6, 2007

Science
An archaeologist finds an old piece of wood. The carbon-12 to carbon-14 ratio 1/16 the ratio measured in a newly fallen tree. Estimate the age of the piece of wood
March 6, 2007

chemisty
fefghgeetw
March 1, 2007

math
(2w-1)^2=4(w-3)^2 Expand both sides of the equation, then simplify: 4w^1 - 4w + 1 = 4w^2 - 24w + 36 ...... ..... w = 7/4
February 26, 2007

Math
What is the product of 5x^2 and 3x^5? exponents add, so 15x7
February 23, 2007

Math
The expression (3x+4) (2x-6) is equavalent to? 3x(2x-6)+4(2x-6) multipy out brackets to give: 6x^2 - 18x + 8x - 24 collect like terms to get: 6x^2 - 10x - 24
February 23, 2007

AP U.S. History 1920's immigration
Fu(k schooll
February 21, 2007

science
Having a hard time understanding "representative particles". ie. which are atoms, compounds etc. For example, what is the representative particle for sodium fluoride? carbon monoxide? Atoms are the smallest unit of an element. Molecules are composed of two or more ...
February 20, 2007

Chemistry and Balancing
Mr Pursley. i was wondering if you would be kind enough to explain to me the process of balancing equations I undestand some of the rules but I continue, to make simple mistakes. Would you kindly offer some assistance please, via email. To help me get through this plateau. ...
February 14, 2007

ETH123
What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? Please refer to this post, recently answered: http://www.jiskha.com/display.cgi?id=1170193455 =)
February 8, 2007

SCIENCE
What type of bonding holds the compound, sodium cyanide, together? The CN bond is covalent. The Na to CN bond is, in most minds, an ionic bond. The electronegativity of C is about 2.1 and that of Na is about 1; therefore, with a difference of about 1 it is polar covalent. ...
February 7, 2007

CHEMISTRY
Given assumed valencies: H=1, N=3, & C=4 i am now required to draw the structural formulae of HYDROGEN CYANIDE and CYANOGEN. H:C:::N is the Lewis electron dot structure. If you want to use "sticks" as a bond instead of two electrons, one stick stands for two ...
February 7, 2007

SCIENCE CHECK
Pleas check the following for me... "A drop of oil (vol 0.051cm ) is released on to the surface of a pond where it covesr an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. Calculate the diameter of an oil molecule...
February 6, 2007

chemistry
0.0351 is the actual answer.
February 5, 2007

CHEMISTRY
I am given a list of apparatus, liquids & solids and am trying to convert aluminium selenide from solid to geseous states does the following sound correct?... Aluminum selenide (in the round-bottomed flask) reacts with water (coming from addition funnel which is connected via ...
February 4, 2007

CHEMISTRY
What is the true meaning of dimerize and trimerize - neither of these words are found in any dictionary and hence, are not actually in use: scientific jargon perhaps, but not proper English. Also, if it is in proper use, in the UK, is it spelt dimerise & trimerise ending in SE...
February 4, 2007

Chemistry
How would I explain how I arrived at the following EF in words?
February 3, 2007

help me unscramble this word
G E D Y R A A
January 25, 2007

eth
research to determine if the group colonized or if it immigrated to the United States. Did the group face prejudice, segregation, racism or any combination of the three? If so, how and why? Include your research findings in your essay. You may search through chapters of the ...
January 24, 2007

eth
Imagine yourself as a current member of that group, and consider the question, “Would I want to immigrate to the United States, and why?” Think about what opinion you would have of the immigration process, including naturalization, the costs, fingerprinting, etc. ...
January 24, 2007

eth
Should United States government policy favor certain kinds of immigrants? o Should [citizenship] preference be given to the neediest applicants? The most talented? The most oppressed? The richest? o Should applications from certain countries be given priority? Please let us ...
January 24, 2007

Science
What are the formulas for lithium bromide? http://www.webelements.com/webelements/compounds/text/Li/Br1Li1-7550358.html where can i find the formula for cupric nitride,and magnesium chloride also. and what are the formulas for the compounds formed by Fe2+,Cl- how do you figure...
January 7, 2007

Pre-Calculus
One model for the population P of bacteria in a sample after t days is given by P(t) = 1000 - 19.75t + 20t² - 1/3t³ Whoops accidently hit post question a)what type of function is P(t) b)when is the bacteria population increasing c) When is it decreasing
December 29, 2006

ANALOGIES
i lied i dont know
December 11, 2006

SCIENCE.... just need a web
Do you know a website that I could find something about humidity? THANKS A LOT !!!! What exactly do you need to know about humidity? type in "humidity", except more specific, on google. http://en.wikipedia.org/wiki/Help:Contents
December 6, 2006

Science
What has a physical and chemical change at the same time, apart from a candle burning wood.
December 5, 2006

Math Word Problem
A turtle crawls a hill 2 feet and slides back 1 foot each attempt. How many attempts will it take to reach the 14 foot hill? Please explain. Thanks
December 4, 2006

biology: chitinase
In an experiment I did, Serratia marcescens grew really well in the Sherry cooking wine I used. Is this because the chitinase that the Serratia marcescens producing binds the carbs with the alcohol?
December 1, 2006

egg weight
Anyone know the weight of an egg. I need it to do some calculations for my science project. IT depends on the size of the egg. Eggs vary from 35 grams (small egg) to 75 grams (AA large).
November 30, 2006

Math
How do I use pythagorean theorem if I already know what c is, but I am missing one of the legs? If you know the length of one of the legs, a (besides the hypotenuse, c), then use b^2 = c^2 - a^2 and solve for the unknown leg length, b. This only works IF it is a right triangle.
November 28, 2006

Social Studies . HELP!!!
What are some foods in Jamestown? Thanks! Are you asking about present Jamestown, Virginia? Or about the colony of Jamestown in 1607? Please clarify your question and we'll be glad to help you find your answer. i need to know all you know about jamestown or at least where ...
November 19, 2006

Algebra
solve (3,5) and (9,8)
November 3, 2006

Chemistry
why does inoinzation energy tend to decrease from top to bottom within a group? i'm not sure, but i think it has something to do with the size of the element The electrons involved in ionization, that is, the outermost electrons, are farther away from the nucleus, and are ...
October 31, 2006

math
what is n! ? It stands for n factorial. For example, if n = 3, then 3! is 1 x 2 x 3 = ??
October 31, 2006

math
the radius of a circle when the numeric values of the circumference and the area are equal Start with what you know. If you know the formula the area of a circle, and the formula for the circumference of a circle, then you can set them equal to each other...from there you ...
October 31, 2006

math
only cube that is one less than a square. answer is from 1-31 actually, wouldn't any fraction's cube be less than its square? i.e.: (1/2)^3 = 1/8 (1/2)^2 = 1/4 1/8 < 1/4 julie the answer is from 1 to 31 not a fraction 8 its cubed root is 2 and 3 squared = 9
October 30, 2006

math
what is 45 times 20 900 900 Do you have a calculator? Do you know how to do multiplication by hand? Tell us what you don't understand. You need to learn how to do this instead of relying on someone to give you the answer.
October 24, 2006

where is the oldest surviving parliament?
The roots of parliaments are many and diverse. The oldest surviving parliament is generally regarded as being the Althing in Iceland, but a break in its function in the 19th century means that the longest continuous parliament is the Tynwald of the Isle of Man. Among the ...
October 12, 2006

Spanish
Hey, I have to write a 200-250 word paper on my life in the future as a famous person. I am in a magazine, and i have to write about how my life, career, and family are. I have recieved help from others, and I was hoping someone could double-check my work before I turn it in ...
September 27, 2006

Algerbra
solve for x ac+x=xy have all terms with x on one side ac=xy-x take x as common factor ac=x(y-1) now solve for x 25a^2 - 9b^4 can u please help me solve and check these equations
September 26, 2006

Spanish
Hey, I have to write a 200-250 word paper on my life in the future as a famous person. I am in a magazine, and i have to write about how my life, career, and family are. I would appreciate it if someone could proofread my Spanish. Thanks! SPANISH: La revista de prensa rosa, In...
September 26, 2006

mathematics
what is the factor of x^4-x^2+16 and x^4-7x^2y^2+9y^4 Replace x^2 with b. This would make x^2 turn into b and x^4 turn into b^2.
July 28, 2006

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