Friday

March 6, 2015

March 6, 2015

Total # Posts: 518

**Math 157 **

how many polygon arrangements does a semi-regular tessellation have?
*July 3, 2010*

**Chemistry**

A cubic piece of metal measures 6.50 on each edge. If the metal is nickel, whose density is 8.90 , what is the mass of the cube?
*June 14, 2010*

**chemistry**

Data obtained from lab (neutralization): H2SO4: C =1.0mol/l V = 30 mL Initial temp. = 24.1 NaOH c= 1.0mol/L v= 50 mL initial temp. = 23.9 Final temp. of H2SO4 & NaOH = 32.9 Assume specific heat capacity of both these substance is equal to water's = 4.19 Calculate the molar...
*June 12, 2010*

**Chemistry 30**

According to the data booklet Cu(NO3)2 and Sn(s) are spontaneous Cu2+ being a strong reducing agent and Sn(s) being a strong oxidizing agent but according this lab: d2l.adlc.ca/content/ADLC-Depts/ScienceSH/SCN3796-5cBl-08Feb10/chemistry_30/mm/m3/m3_l3_testing_predictions/...
*June 10, 2010*

**Math 157**

The chart on the next page is an example of a quality control chart. Samples of parts and products are drawn from an assembly line and checked against engineering specifications. Write a short report describing the various features of the chart and the performance of the ...
*May 28, 2010*

**Chemistry **

That's really easy. you do 250/100 which is 2.5 then, you multiply that to the mass of KCl and get 90g like what the other person said.
*May 26, 2010*

**math/area**

On grid paper I have a capital letter I three cubes across to make the top of letter I, three cubes in the middle, and three cubes across the bottom? So, how would I figure out the area?
*May 19, 2010*

**Math**

Yesterday someone posted my exact question, but I can't find the answer. What is area/perimeter of capital letters: I, U, and J? I know that area= lxw P= add up all the sides The area part is hard to figure
*May 19, 2010*

**Math**

number 9 is D
*May 16, 2010*

**math**

The Rental Depreciation Problem. The owner of a rental house can depreciate its value over a period of 27 ½ years, meaning that the value of the house declines at an even rate over that period of time until the value is $0. a. By what fraction does the value of the ...
*May 7, 2010*

**english**

ur welcome emilio
*May 3, 2010*

**english**

Search on the internet for more details about earthquakes.
*May 3, 2010*

**english**

An earthquake is a violent shaking of the Earth's crust that may cause destruction to buildings and results from the sudden release of tectonic stress along a fault line or from volcanic activity.
*May 3, 2010*

**Math**

Suppose r(x) = 8(x)^(1/2) represents revenue and c(x) = 2(x)^2 represents cost, with x measured in thousands of units. Is there a production level that maximizes profit? If so, what is it?
*April 28, 2010*

**Elementary math for teachers**

Scoring in Golf. A golfer played 8 rounds on a tournament course with the following scores (par is the expected score for a round; negative numbers represent the number of strokes under par for the round, and positive numbers represent the number of strokes over par for the ...
*April 27, 2010*

**History WWII**

Can you help me put the following events in order: -hitler declares austria part of germany -naie terrorize jewish on "kristallnacht -france and GB agree to defend Poland -hitler and stalin sign a friendship treaty -the leaders of GB, France, Italy and Germany meet -nazi ...
*April 27, 2010*

**math**

write 40% two different ways
*April 22, 2010*

**Geometry**

BD is a perpendicular bisector of triangle ABC. XZ is a perpendicular bisector of triangle WXY. Triangle ABC is similar to triangle WXY with a scale factor of 1:3. Part I. Find BD, AB, WZ, XZ and WX. Part II. What is the scale factor of the perimeters of triangle ABC and ...
*April 6, 2010*

**math**

find the volume of the solid whose base is bounded by y=e^(-x), y=3cos(x), and x=0 and whose cross sections cut by planes perpendicular to the x-axis are squares the answer is 3.992 units cubed but can someone explain to me how to get this answer using integrals?
*April 5, 2010*

**science**

where in the renal tubule is potassium and sodium reabsorbed by the blood?
*April 4, 2010*

**chemistry **

thank you :)
*April 2, 2010*

**chemistry **

How many electrons are transferred in the production of 6.06×10^−4 mol H2(g) from water?
*April 2, 2010*

**Science**

You throw a ball upward and then it falls back down. How does the velocity of the ball change as it rises and falls?
*March 29, 2010*

**Chemisrty**

okay so if the molar mass of Na3PO4 is 164. a multiply that by 0.1 and then multiply that by o.25 ??
*February 22, 2010*

**Chemisrty**

how do i solve for XXXX
*February 22, 2010*

**Chemisrty**

what mass of sodium phosphate is required to make 250mL of 0.10mol/L solution?
*February 22, 2010*

**Chemistry**

How many electrons and how many protons are in the ion Cr6+?
*February 19, 2010*

**Calculus 2**

Find the volume of the solid obtained by revolving the graph of y=x(sqrt(1-x^2)) over [0,1] about the y-axis. How do you write the integral?
*February 17, 2010*

**Chemistry**

The phosphoric acid in a 100.00 mL sample of a cola drink was titrated with 0.1476 M NaOH. The first equivalence point was detected after 13.32 mL of base added, and the second equivalence point after 28.65 mL. Calculate the concentration of H2PO4- in mol/L. (Hint: if only ...
*January 29, 2010*

**English**

Is "in 1978" and adjective phrase then?
*January 24, 2010*

**English**

What is the modifier of the prepostional phase and what kind of prepostional phrase is it? Adverb or Adjective? 1. Its invention in 1978 revolutionized technology. 2. The microwave oven was invented in 1946.
*January 24, 2010*

**math**

There is an 8 square box, I have to put the numbers 1-8 in the eight boxes, BUT no consecutive numbers can be by each other, and cannot be by each other vertically, horizontally, or diagonally. How can the numbers 1-8 fit in there when they can't be by each other. I tried ...
*January 20, 2010*

**Chemistry**

Thanks!
*January 9, 2010*

**Chemistry**

A car air bag requires 70. L of nitrogen gas to inflate properly. The following equation represents the production of nitrogen gas: 2NaNsubscript3 -> 2Na + 3Nsubscript2 The density of nitrogen gas is typically 1.16g/L at room temp. Calculate the number of grams of ...
*January 9, 2010*

**math**

i need help with this question.any help would be appreciated. 1.A company designs jackets that have stripes of equal width but different color.The background color of the jackets is different than the color of any of the stripes. How many different color patterns can the ...
*January 5, 2010*

**Calc II**

For the following question, we need to find the length of the polar curve: r= 2/(1-cosx) from pi/2 </= x </= pi dr/dx= -2sinx/(1-cosx)^2 therefore the length would be expressed as follows: the integral from pi/2 to pi of (sqrt)[(2/(1-cos))^2 + (-2sinx/((1-cosx)^2))^2 ...
*December 13, 2009*

**The Bell Curve**

In The Bell Curve, Richard Herrnstein and Charles Murray argued that the nation cannot come to terms with its massive social problems until it confronts the role of intelligence. "How bright someone is, is the single variable that has the largest impact on income and ...
*December 7, 2009*

**Calc II**

Perform long division on the integrand, write the proper fraction as a sum of partial fractions, and evaluate the integral: (integral of) 2y^4dy/y^3 - y^2 + y - 1 After long divison I get: (integral of)2ydy + 2(integral of)dy + (integral of) 2/y^3 - y^2 + y - 1 I keep getting ...
*December 6, 2009*

**calc II**

Express the integrals as the sum of partial fractions and evaluate the integral: (integral of) (x^2)dx/(x-1)(x^2 +2x+1) My work: The above integral is equal to x^2dx/(x+1)^2 (A/x-1) + (B/x+1) + (Cx+D)/(x+1)^2 = x^2 A(x+1)^2 + B(x-1)(x+1) + (Cx+d)(x-1) = x^2 Ax^2 + 2Ax + A + Bx...
*December 6, 2009*

**math**

3^3+4.2x8 divided by .2-(this is 3 to the third power)
*December 2, 2009*

**foreign language**

(La pintura) envía el mensaje de que hay algo más profundo de la personalidad detrás de todo el mundo que en la superficie.
*November 29, 2009*

**psychology**

Spinal cord regeneration: Given what you know about axons and dendrites (which constitute the spinal cord), do you think the findings of regeneration in rats will apply to humans? What about humans whose spinal cords are crushed, rather than severed? What about people like ...
*November 20, 2009*

**Social studies**

I need the same thing, but i can't find it. help!!!
*November 6, 2009*

**Genetics**

Given the sequence of bases in the sense strand of DNA shown below, please answer the following questions. 5'-ATGTTTCCCCAGAAGAGGTATGGGAAAAAGATTTGA-3' a. Show the sequence of bases in the messenger RNA encoded by this gene. I'm not sure what this means. I looked up...
*November 4, 2009*

**Algebra 3**

how would I write this in quadratic form? 4x to the eighth power plus 4x to the fourth power plus seven.. I am so confused..
*November 1, 2009*

**biology**

what are they differenves between eprokaryotes& prokaryotes?
*October 21, 2009*

**6th Grade Science**

hi do you know any answers about 6th grade science i am learning about right now is centimeter and millimeter if you can help me that is great Thank You
*October 19, 2009*

**College Physics (repost)**

A 4.1 kg block is attached to a spring with a force constant of 550 N/m , as shown in the figure. Find the work done by the spring on the block as the block moves from A to B along paths 1 and 2. W=? How do your results depend on the mass of the block? Specifically, if you ...
*October 12, 2009*

**Physics**

A 4.1 kg block is attached to a spring with a force constant of 550 N/m , as shown in the figure. Find the work done by the spring on the block as the block moves from A to B along paths 1 and 2. W=? How do your results depend on the mass of the block? Specifically, if you ...
*October 12, 2009*

**Genetics**

Show the F1 and F2 progeny phenotypic and genotypic ratios of the following dihybrid cross involving unlinked purebred Mendelian traits (tall plants, long stems X dwarf plants, short stems) under the following conditions: a. the alleles for tall plants and long stems are ...
*October 7, 2009*

**math**

Max, James, and Brett were playing basketball. One of them broke a window, and the other two saw him break it. Max said, "I am innocent." Jamess said, "Max and I are innocent." Brett said, "Max and James are both innocent." If only one of them is ...
*October 5, 2009*

**chem**

A chemist requires some 3-hexanone for a reaction, but only has some 3-hexene available. Explain using chemical reactions, how the 3-hexene could be converted to 3-hexanone. Include the conditions needed for each step. (You will need two steps).
*October 5, 2009*

**MLA in-text citations**

A professor gave us an assignment based on one of three websites. The website I chose has multiple pages, each with a title, but none of the pages have titles. When citing a fact or quotation from a certain page, should I use the page's title in the in-text citation?
*October 4, 2009*

**Physics!! **

got it! 11.879!!! Thanks didn't see the g on the .2....awesome!!!!
*September 30, 2009*

**Physics!! **

3.794 is wrong too sqrt(2(.2)(36))
*September 30, 2009*

**Physics!! **

now i getting 3.878 and it still wrong...=-(
*September 30, 2009*

**Physics!! **

This is what I done before I end up getting v=26.5887 and for some reason it's wrong =(. I not sure why though.
*September 30, 2009*

**Physics!! **

An elevator's cable snaps and its emergency brakes start gripping at the secondary line in order to slow its descent. The elevator and passengers weigh 389 kgs together and fall under the influence of gravity (9.81 m/s2). The coefficient of friction between the brakes and ...
*September 30, 2009*

**social studies,word unscrambler**

the and thats your andsexfdjwfdk
*September 28, 2009*

**algebra**

3+1/7x +5x=453/7
*September 28, 2009*

**Genetics**

A flowering plant with orange petals is self-crossed to yield the following phenotypes: red flowers- 30 orange flowers- 62 yellow flowers- 33 Choose symbols and designate the genotypes of each of the above phenotypes. I am pretty sure that the above data suggests incomplete ...
*September 23, 2009*

**Genetics**

Two traits (stem length and seed color) are simultaneously examined in a cross of two pure-breeding pea plant varieties. A tall green plant is crossed with a dwarf yellow plant, and the resulting F1 plants are self-crossed. A total of 640 F2 progeny are phenotypically ...
*September 23, 2009*

**Calculus**

I'm having trouble with the following problem: Find the volume of the solid generated by revolving the region about the given line. The region is in the first quadrant bounded above by the line y= sqrt 2, below by the curve y=secxtanx, and on the left by the y-axis. Rotate...
*September 22, 2009*

**math**

How do you write (2x3)x5=30 without changing the number sequence?
*September 21, 2009*

**Calculus**

Thank you!
*September 10, 2009*

**Calculus**

Can someone look over my work and tell me if my steps look correct? I'm trying to correct some problems that looked wrong. Instructions: Find the total areas between the given curves. 1. x= (y^3) and x=(y^2) on the interval [0,1] (integral from 0 to 1 of) ((y^3)-(y^2))dy...
*September 10, 2009*

**Calculus**

I still keep getting 4. At this step: area= int (3-2y^2-y^2) dy = int (3(y^2-1) dy shouldn't it be int(3(1-y^2)? I did this: 3int(dy)-3int(y^2)dy= 3y- (3(y^3)/3) = 3y-(y^3) from 1 to -1... filling those in, I get 4. Am I still making a mistake?
*September 10, 2009*

**Calculus**

We're doing a lab in my Calc II class and I'm stuck on this question. I tried to do it by looking at instructions for a similar question in the book, but it made me more confused. Here is the question and my work: Find the area of the region enclosed by the lines and ...
*September 10, 2009*

**science**

How would you describe how tissues form your heart?
*August 24, 2009*

**science**

How would you describe a muscle cell?
*August 24, 2009*

**Science**

How would you describe a bone cell?
*August 24, 2009*

**calculus**

I am studying for a final exam and in our review packet we have this question, which I am having trouble with: lim (x-->0) ((e^x)+x)^(1/x) I tried this problem two ways. The first was with L'Hopitals rule... lim(x-->0) (1/x)((e^x)+x)^(1/x-1) * (e^x+1) but that doesn...
*May 20, 2009*

**math**

what is the function rule for input x 1,2,3,4,5,6 and output y 1,3,5,7,9,11 Thank you very much!
*May 18, 2009*

**math**

what is the function rule for input x 1,2,3,4,5 and output 3,2,0,-1,-2
*May 18, 2009*

**math**

I really need help. Please help. Solve for x: log(subscript)3(3x+1)-log(subscript)3(x-1)=2
*May 17, 2009*

**Calculus**

For the function f(x)=10-4(x^2), find a formula for the lower sum obtained by dividing the interval [0,1] into n equal subintervals. Then take the limit as n->infinity to calculate the area under the curve over [0,1]. I only need help with the first part. I don't really...
*May 5, 2009*

**unit rate**

how do u find the unit rate
*April 14, 2009*

**Health**

it can help by showing u unhealthy thingsand can prevent younger child from getting obbese by making the parents more aware of unhealthy foods idk im only in 6th grade
*April 14, 2009*

**unit rate**

ok im having trouble with unit rates i cant seem to get them can sum 1 help me or like giv an example to me so i can do the rest of my hw and understand it
*April 14, 2009*

**unit rate**

find the unit rate 175 calories in 12 ounces
*April 14, 2009*

**unit rate**

find the unit rate $920 for 40 hours
*April 14, 2009*

**science**

wen u stop beathing
*April 14, 2009*

**college**

What is the difference between Mahayana and Theravada Buddhism?
*March 9, 2009*

**journal article about running**

i need to find a peer reviewed journal article pertaining to my chosen behavior modification project, which is to start running regularly. the article should be at least 3 pages in length and must include empirical research.
*February 26, 2009*

**year 8 art**

thanks for your help but im sorry im still stuck i don`t understand how to start the story off. ive got to write about what i think is happening in the paintings ive looked on the sites everyone has been kind enough to find . its the mona lisa and the michaelangelo im ...
*December 29, 2008*

**year 8 art**

ive got the flu and i have loads of homework to do and i am strugging with this one for my art homework i have got 4 pictures of paintings. 1/Michaelangelo, creation of Adam, 2/ Botticelli, Birth of Venus , 3/ Mona Lisa , 4/ George and the Dragon. I need to tell a short story ...
*December 29, 2008*

**hcc**

how do the masses iof electrons compare with the masses of protons?
*October 29, 2008*

**grammar**

I meant, is the date 1901 a proper noun?
*September 23, 2008*

**grammar**

Is the date "1901" a proper know?
*September 23, 2008*

**Biology**

Why does it make a difference if you measure metabolic rate in terms of O2/animal or O2/g?
*September 3, 2008*

**Ethnic Diversity**

Yeah im confused! lol i just needed some help for info. its 2 years later after yall got the help now im needing it ha
*September 2, 2008*

**biology**

why are animals shaped differently in cooler climates than in warmer ones?
*August 21, 2008*

**Math**

Can someone help me with this I am very confused When managing a business, it is important to take inventory of where your money is spent. You have a monthly budget of $5,000. Refer to the table below and answer the questions that follow. Round your answers to the nearest ...
*June 29, 2008*

**Data management**

A coin was tossed 1000 times in an experiment to decide whether it really had an equal chance of coming up heads or tails. The decision was made in advance to declare the coind NOT FAIR if the observed outcome of the experiment had less than a 5% chance of happening. Would the...
*June 10, 2008*

**Data Management Help!**

A coin was tossed 1000 times in an experiment to decide whether it really had an equal chance of coming up heads or tails. The decision was made in advance to declare the coind NOT FAIR if the observed outcome of the experiment had less than a 5% chance of happening. Would the...
*June 7, 2008*

**Data Management, Math**

Chebyshev's Theorem states that withing 2 standard deviations (regardless of the mean) that 95% of data is contained. There is also a theorem that states the minimum % of data that will lie between 2 standard deviations. Chebyshev's Theorem states that regardless of ...
*June 7, 2008*

**statistics**

mu=78 population std deviation=12 Normal Distribution n=16 alpha level=.05 * compute the power of the hypothesis test if the program has a 3-point effect. I came up with 83.88 % * compute the power of the hypothesis test if the program has a 6-point effect. I looked at the ...
*June 3, 2008*

**math**

The base is 25/16.
*June 2, 2008*

**math**

Wouldn't that be a decimal answer. Oh, and yes -3/2 is an exponent.
*June 2, 2008*

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