Tuesday
July 28, 2015

# Posts by jenna

Total # Posts: 531

chemistry
if 30ml of .150 M CaCl2 is added to 22.5ml of .1 M AgNO3, what is the mass of the AgCl precipitate?
October 11, 2010

write two ways to break apart each array
October 7, 2010

physics
spherical aluminum ball of mass 1.22 kg contains an empty spherical cavity that is concentric with the ball. The ball just barely floats in water.Calculate the radius of the cavity.
October 5, 2010

math
How do you write a number in expanded form?
September 30, 2010

PHYSICS-HELP!!
Two bicyclists, starting at the same place, are riding toward the same campground by two different routes. One cyclist rides 1500 m due east and then turns due north and travels another 1430 m before reaching the campground. The second cyclist starts out by heading due north ...
September 16, 2010

Physics
I have a quick question, If a ballplayer catches a ball 3.0s after throwing it vertically upward. With what speed did he throw it, and what height did it reach?
September 13, 2010

physics
thank you very much
September 1, 2010

physics
A pump is installed in the basement of a 10-storey building in order to supply the occupants with water. Each storey is 3m high. How much pressure must the pump exert on the water so that the water reaches the 10th floor with a pressure of 400 kPa?
September 1, 2010

Physics
Within a book on a desk there are billions of forces pushing and pulling on all the molecules. Why is it that these forces never by chance add up to a net force in one direction, causing the book to accelerate "spontaneously" across the desk?
August 26, 2010

Accounting
Please check my answers. Identify each of the following as either assets, liabilities, or owner's equity. 1. Petty cash- Owner's Equity 2. Mortgage payable- Liabilities 3. Furniture- Assets 4. Owner's Capital- Owner's Equity 5. Food inventory- Assets 6. Profit...
August 24, 2010

Math
Use the discriminant to determine how many real number solutions the equation has 1-7a^2=-7a-2
July 20, 2010

Math
5x^2+4x+6=0, given the graph of y=5x^2+4x+6
July 20, 2010

Math
Give the equation of the line that is perpendicular to the line y=-3+7 and passes through point (0,-6)
July 20, 2010

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

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
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
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

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

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