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October 23, 2014

Posts by jessica


Total # Posts: 2,639

chemistry
what is the specific heat capacity of substance X when 34.80 g of X is heated from a starting temperature of 20.5 C to 40.9 C by 2.54 kJ of energy
March 31, 2011

Physics
A submarine has run into trouble and is stuck at the bottom of the ocean. Several people are on board and must make their way to the surface without any diving gear. The air pressure aboard the submarine is 3.100 atm. The air temperature inside the submarine is 10.01 ¢XC ...
March 29, 2011

chemistry
Using the activity series, write a balanced chemical equation for the following reactions: 1. iron metal is added to a solution of copper (II) nitrate 2. zinc metal is added to a solution of magnesium sulfate 3. hydrobromic acid is added to tin metal 4. hydrogen gas is bubbled...
March 27, 2011

Applications
Determine the median of the following numbers25,28,22,27,25,20/30,23,27, and 29
March 23, 2011

physics
A car is driven 110 km west and then 25 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)? ...km ... degrees south of west
March 20, 2011

english
im studying for test and I am supposed to write about "what are gender roles, how do they effect,, influence, inform our conceptions of masculinity and feiminity. I especially dont get the femininty and masculinity part. Thanks and I appreciate ur help!
March 19, 2011

chemistry
find the concentration of HCL if the pH of the solution is 0.50
March 17, 2011

Perform the indicated operations
x/4-5/6=3/6
March 16, 2011

chemistry
4.72 moles of sulfur trioxide molecules contain how many oxygen atoms? i know the answer is 8.53 x 10^24 but i do know how my professor got it **this is one of my practice exam question!
March 14, 2011

Physics
If you have two tables and in Table 1, is using the indirect method and you have the measurements, 11.37 and 12.57 cm. In Table 2, is using the direct method which has the measurement of one item out of 100 with the measurements of 0.642, 0.741, and 0.683 cm. What is the ...
March 14, 2011

pre algebra
Multiple the first equation by -1: -y=-x+2 Add it from the second one to get: y=4x+1 +(-y=x+2)= 0=3x+3 Subtract 3 from both sides: -3=3x Divide by 3 x=-1 Plug it in for one equation: y=(-1)-2 y=-3
March 14, 2011

chemistry
1652 x (3.82 moles/4 moles) = 1577.66
March 13, 2011

Science - Physical
Earth's magnetic field induces some degree of magnetism in most of the iron objects around you. With a compass you can see that cans of food on you pantry shelf have north and south poles. When you pass the compass from their bottoms to their tops, you can easily identify ...
March 13, 2011

Accounting
American Food Services, Inc., leased a packaging machine from Barton and Barton Corporation. Barton and Barton completed construction of the machine on January 1, 2011. The lease agreement for the $4 million (fair value and present value of the lease payments) machine ...
March 10, 2011

Accounting
On June 30, 2011, Georgia-Atlantic, Inc., leased a warehouse facility from IC Leasing Corporation. The lease agreement calls for Georgia-Atlantic to make semiannual lease payments of $585,423 over a three-year lease term, payable each June 30 and December 31, with the first ...
March 10, 2011

Math/Algebra
y^2-4y-12=0 Please help. :)
March 8, 2011

wxmaxima help math mate!
so what will the arEA BE?
March 8, 2011

wxmaxima help math mate!
one expression is y=log(-100493/40000)x the x is next to the (-100493/40000) same with the other expression y=atan(-100493/40000)x, y=exp(100493/40000x) approximate the region bounded by the given curves. be sure to specify a range of x and y that results in a good picture of ...
March 8, 2011

math
A right circular cone is inscribed inside a sphere. The right circular cone has the radius of the base of 4 inches and the height is greater than 2 inches. The sphere has a radius of 5 inches. What is the ratio of the volume of the cone to the volume of the sphere? Leave your ...
March 6, 2011

CALCULUS WXMAXIMA HELP PLEASE!
y=log(100493/40000x), y=atan(-100493/40000x), y=exp(100493/40000x) approximate the region bounded by the given curves. be sure to specify a range of x and y that results in a good picture of the region. you need two integral to represent the area
March 4, 2011

College algebra
25a-20ab+4b=
March 3, 2011

earth
describe the relationship between mass movement and gravity?
March 2, 2011

algebra 2
What is the quotient: (–3x3 + 16x2 + 13x – 6) ÷ (3x – 1) ?
March 1, 2011

parent
The general trend of American's attitudes toward the unmarried has been from an attitude of _____ in the 1950s to an attitude of ______ in the 2000s A.) Non-acceptance; acceptance B.) Neutrality; non-acceptance C.) Non-acceptance; neutrality D.) Neutrality; tolerance
February 28, 2011

maths
jo-jo had two mice, every month the number of mice doubled. in how many months would there be 2048?
February 28, 2011

Math
For some reason when posted the answers show differently. Here are all the answers, which are correct: 1.0.057 2. 68% 3.r is not significant at 5% or at 1%. 4.0.820 = 82.0% 5.y = 1.7 + 1.9x 6.14.97 7.Kelly 8.r is not significant at 5%. 9.Positive linear relationship 10.70th ...
February 26, 2011

Math
1. Question : Find the area under the normal distribution curve between z = 1.52 and z = 2.43. Student Answer: 0.929 0.436 0.493 0.057 Instructor Explanation: See section 12.6 of the textbook. Points Received: 1 of 1 Comments: 2. Question : The area under a normal ...
February 26, 2011

Physics 2(Plz Help! :) :) ;))
A bullet leaving a rifle at an angle of 45 degrees travels a distance of 10 Km determine: A). The muzzle velocity B). What angle would you have to shoot the same bullet to go HALF the distance? Lower angle
February 24, 2011

Physics(I Have No Idea!!) :)
A ball is thrown at 30 m/s horizontally off a building. it lands 100 meters from the base of the building. How high is the building?
February 24, 2011

English
thank you so very much!
February 24, 2011

English
Add it How are these words alike? add more. made,play,train...
February 24, 2011

CALCULUS 3
Use the triple scalar product to determine whether the given points lie in the same plane. A(1, 2, 3), B(3, -4, 8), C(7, -1, 1), D(5, 5, -4)
February 24, 2011

10th
Economics involves many graphs and tables and determining supply and demand based upon these. If you are not strong in math you may be better off to seek another course that does not involve math (or science since you stated that is also not a strong area). An example may be a...
February 23, 2011

Chemistry
what was the first sample in the ChemQuandry and where is it used
February 23, 2011

physics
430.7692308
February 22, 2011

Algebra 2
How do I solve polynomial equation by finding all complex roots? The problem is: factor each expression and find all complex roots of x^3+64 I got as far as x^3+64=(x+4)(x^2-4x+16) Now how do i find the roots of (x+4) and the roots of (x^2-4x+16) Thanks
February 22, 2011

Physics
A stone is thrown from a 50m high cliff and lands 5 seconds later, 40m from the base of the cliff. At what speed and angle was the stone thrown?
February 22, 2011

math
Francisco has $2000. He invested part at 7% and the rest at 12%. If his annual return was $215, how much did he invest at each rate?
February 21, 2011

calculus
y = log7(x^2 - 6x - 2) this is base seven is the answer 2x-6/(x^2-6x-2)
February 21, 2011

Physics-Optics
A point source of light illuminates an aperture 4.00m away. A 18.0 cm -wide bright patch of light appears on a screen 2.00m behind the aperture. I have been trying to use the equation w=(2*wavelength*distance)/aperature width. However, I am not given wavelength and the type of...
February 21, 2011

chemistry
Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to prepare 1.1 L of a 0.10 M solution of OH^ -.
February 19, 2011

science!
how is nickel used in glass?
February 18, 2011

calculus wxmaxima
i found it but like i understand what youre saying i just dont know how to plug it in wxmaxima is it possible if you can show me thanks very much
February 16, 2011

calculus wxmaxima
does anyone know how to approximate the are and circumfrence of the region bounded by the given curves y=cos(x^2 +(100493/100000)), y=1+x-X^2 i already did the area but i need help with the circumference
February 16, 2011

u.s. history
How did the South, with fewer supplies and resources, manage to stall a Northern victory for four years?
February 16, 2011

calculus wxmaxima
WEll THANKSSSS ALOTTTTTTTTTTTTTTTTT!
February 16, 2011

calculus wxmaxima
okay so i put y=1+x-X^2 found the derivative 1-2*x then i pluged that in into sqrt(1+1-2*x)^2) then i did the romberg thing so is this right i got -1.4336 for this one
February 16, 2011

calculus wxmaxima
okay so for the first f(x) i plug in cos(x^2 +(100493/100000))find the derivative then do i do the same for y=y=1+x-X^2 ?
February 16, 2011

calculus wxmaxima
i understand but i just dont know how to plug it in wxmaxima is it possible if you can show me thanks very much
February 16, 2011

calculus wxmaxima
Thank you very much but i am still confused with the arc length or the circumference
February 16, 2011

calculus wxmaxima
does anyone know how to approximate the are and circumfrence of the region bounded by the given curves y=cos(x^2 +(100493/100000)), y=1+x-X^2
February 16, 2011

AP CALC
A temperature of a 10m long metal bar is 15C at one end and 30C on the other end. Assuming that the temperature increases linearly from the cooler end to the hotter end, what is the average temperature of the bar? Also, explain why at least one place on the bar must have this ...
February 15, 2011

calculus
Find the area bounded by the x-axis ,the curve y= 1/x+2, x=0,y=0, and x=5
February 15, 2011

calculus
use the approximations ln 2=0.693 and ln= 1.609 together with the properties of natural logarithms to calculate an approximation to ln 40
February 15, 2011

Math
Solve by the elimination method 7x-y=17 x+7y=31 What is the solution of the system?
February 14, 2011

Spelling/Grammer
_____ of the nature center is one of the year's goals. What is the answer... from the word box? _______________________________________ WORD BOX _______________________________________ 1. Persuasion 2. Discrimination 3. Expansion 4. Opposition 5. Constitution 6. Narration ...
February 14, 2011

exponents
how do i find the value of exponents
February 14, 2011

Physics
10
February 13, 2011

english
what are you supposed to do with this?
February 13, 2011

Clinical Procedures
nevermind its b
February 13, 2011

Clinical Procedures
What is used to improve the quality of a blood specimen? a) an anticoagulant b) additives c) a tube with a red stopper d) a tourniquet my answer is c. please help!
February 13, 2011

Clinical Procedures
What is one of the most used piece of laboratory equiptment? A. Refridgerator B. health hazard C. MRI machine D. X-ray machine my answer is A. but i cant find the answer anywhere in my book. Please help!
February 13, 2011

statistics
Health Club Schedule The time per workout an athlete uses a stairclimberis normally distributed with a mean of 20 mins and a standard deviation of 5 min. An athlete is randomly selected. Find the probability that the athlete uses a stairclimber between 20 and 28 mins.
February 11, 2011

Science
n could be nuclear
February 10, 2011

algebra
During the month of february, the depth,d, of snow in inches at the base of one ski resort can be approximated by adding 7 to twice the number of days, t, since Jan. 31.
February 10, 2011

Algerbra 1
Shane and Kate are preparing to go on long car trips with their families. Shane bought 8 books and 2 CDs for $73.60. Kate bought 3 books and 4 CDs for $69.85. Both totals were withour tax. All of the books were the same price and all of the CDs cost the same. How much did a ...
February 10, 2011

Clinical Procedures
Why should a recording in the medical record never be erased or obliterated? A. It makes it harder to read the chart. B. The patient may not recieve the proper care. C. It will invalidate the legal value, which would be important in any litigation. D. It's better to write ...
February 10, 2011

Clinical Procedures
On which type of route can a miroorganism travel from one place to another? A. Botulism B. Universal Precaution C. Vector D. Fungi i am torn between A and D. however my answer is A. please help!
February 10, 2011

Chemistry
So, the soulubility for Kno3 IS 245 of 100 grams in water. The solubility for CuSo4 is 180 grams over 100 grams of water. How would you solve that?
February 9, 2011

Chemistry
Determine the number of grams of water which are required to dissolve a mixture of 25 g of KNO3 and 2.0 g of CuSo4 * 5H20 AT 100 Degrees celscius?
February 9, 2011

Science
Determine the number of grams of KNO3 which will dissolve in 100 grams of H20 at 100 degrees celscius?
February 9, 2011

science
a roller coaster has an average speed of 5.0 m/s. if the roller coaster ride last 40 seconds, what distance does it travel?
February 9, 2011

Math
No it was a typo sorry
February 8, 2011

Math
How do you solve for 4y+8=1-5(3y-10)!
February 8, 2011

Chemistry
Could you break that down a little? I don't completely understand.
February 7, 2011

Chemistry
Gold can be recovered from sea water by reacting the water with zinc, which is refined from zinc oxide. The zinc displaces the gold in the water. What mass of gold can be recovered if 2.00g of ZnO and an excess of sea water are available? 2ZnO + C -> 2Zn + CO2 2Au^+3 + 3Zn...
February 7, 2011

Chemistry
The energy used to power one of the Apollo lunar missions was supplied by the following overall reaction: 2N2H4 + (CH3)2N2H2 + 3N2O4 -> 6N2 + 2CO2 + 8H2O For the phase of the lunar module ascended from the surface of the moon, a total of 1200kg N2H4 was available to react ...
February 6, 2011

MATH
Adam was walking down the stairs at his work one day. Adam began on the top step and had already gone down seven steps when he saw Reanna on the ground floor beginning to come up the stairs. Reanna goes up two steps for every one step Adam goes down. Adam was shocked to see ...
February 6, 2011

Algebra 1
I agree with Amy.
February 6, 2011

insurance form preparation
what is a type of insurance policy outling the benefits to be paid for each type of service normally based on the usual and customary rates (UCR) for each community? A. disability insurance B. SSDI C. Free-for-service D. SSI my answer is C. please help!
February 5, 2011

insurance form preparation
What form should be attached to a CMS-1500 form submitted to a secondary insurance company? A. a copy of the CMS-1500 sent to the primary insurance company. B. An Explanation of Benefits (EOB) C. a copy of the patient's medical treatment record. D. a copy of the patient&#...
February 5, 2011

calculus
∫[3√3:(2x^2-3x),]
February 4, 2011

Accounting Ethics
Please, please, please help me I do not understand the material!! This is for a 30 point checkpoint that was due Wednesday. I haven't gotten far because I don't get the stakeholder impact analysis. I got 95% on the appendix B matrix about consequentialism, deontology, ...
February 4, 2011

Accounting Ethics
Please, please, please help me!! I got 95% on the appendix B matrix about consequentialism, deontology, and virtue ethics. I also understand the 3 approaches to decision making the 5-question, Pastin's and Moral Standards approaches, but do not understand this assignment ...
February 3, 2011

Ethics Accounting
I got 95% on the appendix B matrix about consequentialism, deontology, and virtue ethics. But do not understand this assignment about stakeholder impact analysis. Can someone please get me started? Describe, in 200 to 300 words, how you might conduct a stakeholder impact ...
February 3, 2011

Business Ethics
I got 95% on the appendix B matrix about consequentialism, deontology, and virtue ethics. But do not understand this assignment. Describe, in 200 to 300 words, how you might conduct a stakeholder impact analysis of Scenario 1 of Appendix B using each of the stakeholder impact ...
February 2, 2011

Algebra 2
i am trying to solve the equation. I have to find 2 more roots of the X^4 equation
January 27, 2011

Algebra 2
my roots are (1+isq.root2)(1-isq.root2) I then used long division: X^4-4X^3+4X^2-9/X^2-X-4 I got the answer X^2-8X+32 with a remander of 119. Where did I go wrong?
January 27, 2011

algebra 2
2X^4-9X^3+13X^2-X-5=0 Given that one root is 2+i, solve the equation. So far I have it set up like this: 2X^4-9X^3+13X^2-X-5/X^2-4X+5 I don't know how to get the answer, I know that I have to use long division but when I started to try it I kept getting weird answers. ...
January 27, 2011

algebra 2
2X^4-9X^3+3X^2-X-5=0 Given that one root is 2+i, solve the equation. So far I have it set up like this: 2X^4-9X^3+3X^2-X-5/X^2-4X+5 I don't know how to get the answer, I know that I have to use long division but when I started to try it I kept getting weird answers. Please...
January 27, 2011

Algebra-check me
pretax bill in first city = $x : Tax = 5% pretax bill in second city = x-1000: Tax = 4% .. 0.05x+0.04(x-1000)= 387.50 0.05x+0.04x-40=387.50 0.09x=387.50+40 0.09x=427.50 /0.09 x= $4750 Bill in first city
January 27, 2011

Algebra
A theater group made appearances in two cities. The hotel charges before tax in the second city were $1,000 lower than in the first. The tax on the hotel bill was 5% in the first city and 4% in the second. After the trip, the total tax paid on accommodation expenses was $387....
January 27, 2011

math
Perimeter is 2L+2W=P L=length W=width P=perimeter Just plug it in.
January 27, 2011

algebra 2
oh I get it thanks
January 27, 2011

algebra 2
my bad the original equation is: 2X^4 - 9X^3 + 13X^2 - X - 5 = 0
January 27, 2011

algebra 2
2X^4-9X^3+3X^2-X-5=0 Given that one root is 2+i, solve the equation. So far I have it set up like this: 2X^4-9X^3+3X^2-X-5/X^2-4X+5 I don't know how to get the answer, I know that I have to use long division but when I started to try it I kept getting weird answers. Please...
January 27, 2011

Algebra
Compute the value of the discriminant and give the number of real solutions to the quadratic equation. 2x^2+5x-7=0 Discrimnant= number of real solutions=
January 27, 2011

Algebra
Find the midpoint M of the line segment joining the points C = (-4,-5) and D = (2,-1). I got (-1,-3) can you check me? Thanks
January 27, 2011

Biology
What is the relationship between an increase in light intensity and photosynthetic rate in leaves from a corn plant? How does this relationship compare with the tomato plants?
January 27, 2011

Chemistry
I understand how to balance equations when the full equations are given to me but I don't understand how to write a single replacement reaction. Help Me??
January 24, 2011

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