Tuesday
October 21, 2014

Posts by Jessica


Total # Posts: 2,637

Mathematics
A farmer keeps hens and rabbits on his farm. One day, he counted a total of 70 heads and 196 legs. How many more hens than rabbit does he have? Explain your working please. Your help is greatly appreciated.
January 15, 2012

math
Sandy decided to give one-fourth of her CDs to Jenn. Then she gives one-half of the remaining CDs to Bob. If she is left with 6 CDs,how many CDs did she have to begin with?
January 3, 2012

Math
A wall hanging is x inches wide and has a height of 4x inches. If the perimeter is 40inches, what is the height in inches? Please help!
December 31, 2011

Pre-Cal
Find the area of each circular segment to the nearest tenth, given its central angle, x, and the radius of the circle. x= pi/8, r=7
December 28, 2011

math
the shorter leg of a 30-60-90 triangle is 9.4 inches long. find the perimeter.
December 19, 2011

Math
Haha, Steve is correct, I apologize for the guesswork. :/ It's g(x)= 1/3 -4/3x. Going off the work Reiny did, I am still rather clueless, so considering it's only two problems, I guess I'll just have to do some guesswork myself. Thank you for the help, though!
December 19, 2011

Math
I am not exactly sure of what I'm supposed to do in the following question: Describe and correct the error, given the functions f(x)=3x - 5 and g(x)=1/3 - 4/3. The first equation is as follows: g(-3)= 1/3 - 4/3 (3) =1/3 - 4 = -3 2/3 The second equation is: f(1)= 1/3 - 4/3(...
December 19, 2011

chemistry
A sample of cesium metal reacted completely with water, evolving 47.0 mL of dry H2 at 31°C and 769 mmHg. What is the equation for the reaction?
December 13, 2011

physics
A student investigates skateboarding down a slope. She times how long it takes her to skateboard between two lines on a sloping pavement. She varies the distance between the two lines and records her results in a table. Distance s/m time t/s Distance 2 Time 2.32 Distance 4 ...
December 11, 2011

physics
A student investigates skateboarding down a slope. She times how long it takes her to skateboard between two lines on a sloping pavement. She varies the distance between the two lines and records her results in a table. Distance s/m time t/s 2 2.32 4 4.23 9 8.22 11 9.53 The ...
December 11, 2011

philosophy
can anyone tell me is there any strong response aganist norcoss argument that if it wrong to kill puppies, so it is also wrong to support farming factory
December 8, 2011

philosophy
WHat is the strongest response against norcoss argument on puppies, pig and people
December 8, 2011

Physics 201
Suppose the mass of the wing is 0.258g and the effective spring constant of the tissue is 4.00E-4 N/m. Distance d1 = 3.03 mm and distance d2 = 1.76 cm. If the mass m moves up and down a distance of 2.08 mm from its position of equilibrium, what is the maximum speed of the ...
December 5, 2011

english
Am doing Autism and I have to give farther information. Thanks The cognitive part: I have...(1) Selecting attention, I have they absorve things..(2) Concrete processing, i dont have anything for this one. (3) Rote memory: I putted recalling.
December 4, 2011

english
How can you have Motivation, Forecast and Orientation in speech intorduction? like show the audience pictures etc?..thanks!
December 4, 2011

physics
a rod supports a 2.35 kg lamp. a)what is the magnitude of the tension in the rod? b)calculate the components of the force that the bracket exerts on the rod.
December 4, 2011

English
Am doing a project about Autism, what are the Cogngntive and pscohosocial of Autism and where can I find them? Thanks!
December 3, 2011

grammer
what is the adverb and verb for the sentence The players spent all day there.
December 1, 2011

math
The gcf(a,b)=495 and cm(a,b)=31,185 Find possible values of a and b if a is divisible by 35 and b is divisible by 81
November 29, 2011

V/CV OR VC/V PATTERN
v/vc
November 29, 2011

Chemistry
Oops, sorry I meant .004 under initial moles of RNH2 not .001. Regardless I get an answer of 9.84 instead of 10.81
November 26, 2011

Chemistry
For part b of problem 2, I used ..RNH2 + HCl--> RNH3 + Cl I.+.001..+.002...0......0 C.-x......-x.....+x....+x E+.001-x..+.002-x..+x...+x Is this correct? My issue with these problems is that I don't know when to use the variables (like +x and -x for the C in ICE) or ...
November 26, 2011

Chemistry
Regarding your first post, I believe I used aspirin as the weak acid. In a previous problem which was related to these problems, it stated "aspirin is a weak acid with a Ka of 3.0x10^-5"
November 26, 2011

Chemistry
Sorry, one more question. For .........RNH2 + HCl ==> RNH3^+ + Cl^- initial...0....................... added...........0 added..........2.0 added..........4.0 etc change..................... the initial RNH2 is 0? Shouldn't it be the initial moles in the problem (....
November 26, 2011

Chemistry
For problem 1, if it were changed to 20 mL of the .07222M aspirin solution and 5mL of .2M NaOH, how would solving it differ? I tried ...........HA + NaOH ==> NaA + H2O initial..0014444.................. add..............001............ change...-.001.-.001.....+.001...+.001...
November 26, 2011

Chemistry
1.Calculate the pH of a solution prepared by mixing 20mL of the .07222M aspirin solution with 10mL of .2M NaOH. 2. Calculate the pH for the titration of 40mL of .1M solution of C2H5NH2 with .1M HCl for a)0 mL added and b)20 mL added c)40 mL added d)50mL added. Kb= 6.4x10^-4
November 26, 2011

Chemistry
For the ICE box, you are supposed to use the molarity of the aspirin. I did not realize that. Thank you so much for your help!
November 26, 2011

Chemistry
The answer that was in my answer key was 2.83 but I got 3.48. Is there something wrong in the calculations?
November 26, 2011

Chemistry
Aspirin is a weak acid with a Ka of 3.0x10^-5. Find the pH of a solution by dissolving .65g of aspirin in water and diluting it to 50mL. You can use RCOOH to represent aspirin. Molecular weight of aspirin is 180g/mol
November 26, 2011

e-business
In about 100 words, explain what kinds of features of characteristics a midsize business would seek in its electronic commerce software that would not matter to a smaller business.
November 25, 2011

math
How many ml of a 34% sugar solution must be mixed with 2 ml of a 54% sugar solution to make a 38% solution?
November 20, 2011

Mathematics
Given that a√b^2-c = 5k, find the value of: 1. k when a = 3, b = 6 and c = 20 2. c when a = 4, b = 7, and k = 11 Explain your working please
November 16, 2011

physics
A shopper in a supermarket pushes a loaded 31 kg cart with a horizontal force of 12 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 3.6 s, starting from rest? Answer in units of m
November 14, 2011

physics
A shopper in a supermarket pushes a loaded 31 kg cart with a horizontal force of 12 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 3.6 s, starting from rest? Answer in units of m
November 14, 2011

Chemistry (Follow up post - Dr.BOB22)
The first link seems to be broken.
November 13, 2011

Chemistry (Follow up post - Dr.BOB22)
Oh, I'm sorry. I wasn't really trying to put them together. I just wanted you to see what I understood about ionization. And then ask my question. Do you think you could help me understand lasers and plasma arcs connection to ionization levels? or point me to a website...
November 13, 2011

Chemistry (Follow up post - Dr.BOB22)
Ionization is when an electron is removed from an atom and ionization energy is the energy required to do this. "Electrons stream from the negative electrode to the positive electrode. In the process of moving from one electrode to the other they knock electrons in the ...
November 13, 2011

Chemistry
Thank you. My apologies for the repeated postings.
November 13, 2011

Chemistry
I have an assignment to 'Research ionization energy levels and come up with 3 real world applications' and was told to look up lasers, plasma arcs and neon lights. Hours later, (lol) I'm still having a little trouble. Is there any way someone can explain the ...
November 13, 2011

CHEMISTRY
Ionization is when an electron is removed from an atom and ionization energy is the energy required to do this. "Electrons stream from the negative electrode to the positive electrode. In the process of moving from one electrode to the other they knock electrons in the ...
November 13, 2011

CHEMISTRY
I have an assignment to 'Research ionization energy levels and come up with 3 real world applications' and was told you look up lasers, plasma arcs and neon lights. Hours later, (lol) I'm still having a little trouble. Is there any way someone can explain the ...
November 13, 2011

CHEMISTRY
I have an assignment to 'Research ionization energy levels and come up with 3 real world applications' and was told you look up lasers, plasma arcs and neon lights. Hours later, (lol) I'm still having a little trouble. Is there any way someone can explain the ...
November 13, 2011

Chemistry
I'm still having a little trouble. Is there any way you can explain the connection between lasers, plasma arcs and neon lights?
November 13, 2011

Chemistry
Do these three things have ionization energy levels? To be honest, I'm not quite sure how ionization works.
November 13, 2011

Chemistry
I have an assignment to 'Research ionization energy levels and come up with 3 real world applications'. I'm not so sure how to do this. Any help would be appreciated.
November 13, 2011

college physics
What distance will a 10 hp motor lift a 2000 lb elevator in 30 s? What was the average velocity of this elevator during the lift?
November 11, 2011

Physics
An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque ...
November 11, 2011

Mathematics
If a piece of wood is 5 cm longer than a second piece, and 3/4 of the second piece is equal to 3/5 of the first, what is the length of the second piece? Explain your workings
November 9, 2011

Mathematics
Thanks
November 9, 2011

Chemistry
Classify the possible combinations of signs for a reaction's ∆H and ∆S values by the resulting spontaneity. A) Spontaneous as written at all temperatures. B) Spontaneous in reverse at all temperatures. C) Spontaneous as written above a certain temperature. D) ...
November 9, 2011

Chemistry
Calculate the pH of 100.0 mL of .0200 M pyruvic acid and .0600 M sodium pyruvate Calculate the pH of 100.0 mL of .0200 M pyruvic acid and 0.0600 M sodium pyruvate with 0.250 millimoles of H3O+ added.
November 8, 2011

math PLEASE HURRY
there are 24 students in a science class. Mr. Sato will give each pair of students 3 magnets. So far, Mr. Sato has given 9 pairs of students their 3 magnets. homw many more magents does Mr. Sato need so that each pair of students has excatly 3 magnets.
November 8, 2011

math
a developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 336 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed and what are the dimensions that give this maximum...
November 8, 2011

algebra
I have no clue where to begin on this problem. Can some one help me please. One demographer believes that the population growth of a certain country is best modeled by the function P (t) =15 e^.08t, while a second demographer believes that the population growth of that same ...
November 8, 2011

Chemistry
Calculate the pH of the following 0.0500 M H3AsO4 and 0.0500 M NaH2AsO4?
November 8, 2011

Chemistry
Calculate the pH of the following 0.0500 M H3AsO4 and 0.0500 M NaH2AsO4?
November 8, 2011

chemistry
Calculate the pH of a solution made with 0.0600 M carbonic acid, H2C03 and 0.0300 M NaHCO3.
November 8, 2011

Chemistry
Calculate the pH of a solution made with 0.240 M H3PO3 and 0.480 M NaH2PO3.
November 8, 2011

6th grade math
A: 5/100 is exactly 0.05, not less. 0.05 is 5%, not 50% B. 0.7 is exactly 1/7, but 1/7 is not 10%. 10% is 1/10 C. 2/10 is 20%, not 25% and 0.9 is 90%, not 25% D. 0.3 is not 36%, it's 30%. 36/10 is 3.6, not 36%, which is 0.36. None of them seem correct. D':
November 6, 2011

science
On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?
November 3, 2011

physics
The drawing shows a hydraulic system used with disc brakes. The force vector F is applied perpendicularly to the brake pedal. The pedal rotates about the axis shown in the drawing and causes a force to be applied perpendicularly to the input piston (radius = 9.39 10-3 m) in ...
November 1, 2011

u.s. court system part 1
answers to penn foster exam-40600900
October 30, 2011

finance
how long will it take to double my investment with 2500 at 4% annually
October 29, 2011

Physics
A rocket, 8975 kg, traveling at 1255 m/s East explodes into two pieces. if one piece, 2450 kg, moves at 750.0 m/s due south, what is: the mass of the second piece? the momentum of the second piece? the velocity of the second piece?
October 27, 2011

statistics
In 2006, the General Social Survey asked, "Do you see yourself as someone that tends to be lazy?" For this question, 20 people said that they definitely did out of 1513 randomly selected people. What is the 95% confidence interval for the proportion of all Americans ...
October 27, 2011

Physics
A proton, moving in negative y-direction in a magnetic field , experiences a force of magnitude F, acting in the negative x direction. a) What is the direction of the magnetic field producing force? b) Does your answer change if the word proton is replaced by electron? I get a...
October 25, 2011

Chemistry
What caroxylic acid and alcohol is needed to produce isopentyl propionate?
October 24, 2011

Word Problem
A developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 212 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed?
October 24, 2011

BEDMAS with decimals
30.8
October 24, 2011

Physics
An isolated segment of wire of length L=4.50 m carries a current of magnitude i=35.0 A at an angle theta=50.3 degrees with respect to a constant magnetic field with magnitude B= 6.70E-2 T. What is the magnitude of the magnetic force on the wire? a) 2.66 N b) 3.86 c) 5.60 N d) ...
October 24, 2011

Chemistry
What carboxylic acid and alcohol is needed to produce isobutyl propionate?
October 24, 2011

Chemistry
What carboxylic acid and alcohol is needed to produce propyl acetate?
October 24, 2011

Chemistry
What caroxylic acid and alcohol is needed to produce isopentyl propionate?
October 24, 2011

Physics
Suppose that the magnetic field o fthe Earth were due to a single current moving in a circle of radius 2988 km through the earth’s molten core. The strength of the Earth’s magnetic field on the surface near a magnetic pole is about 6.00E-5 T. About how large a ...
October 23, 2011

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the ...
October 23, 2011

Physics
Please help me with these choose the best answers since I'm not sure of my answers. A current element produces a magnetic field in the region surrounding it. at any point in space, the magnetic field produced by this current element points in a direction that is a) radial ...
October 23, 2011

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the ...
October 23, 2011

Physics
Please help me with these choose the best answers since I'm not sure of my answers. A current element produces a magnetic field in the region surrounding it. at any point in space, the magnetic field produced by this current element points in a direction that is a) radial ...
October 23, 2011

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the ...
October 23, 2011

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the ...
October 23, 2011

Physics
1)A wire is carrying a current, i, in the positive y-direction. The wire is located in a uniform magnetic field, B, oriented in such a way that the magnetic force on the wire is maximized. The magnetic force acting on the wire, FB, is in the negative x direction. What is the ...
October 23, 2011

Mathematics
Determine the quadratic equation whose solutions are: 3 and -2. Explain your solution
October 21, 2011

Mathematics
In 11 years, the age of Russel will be half of the square of the age he was 13 years ago. Find his present age. Explain your solution
October 21, 2011

Physics
Two long parallel wires separated by a distance, d, carry currents in opposite directions. If the left-hand wire carries a current i/2, and the right-hand wires carries a current i, determine where the magnetic field is zero.
October 20, 2011

geometry
DEFG is an isosceles trapezoid. Find the measure of E.
October 20, 2011

math
a candy sells chocolate fudge for $4.50 for the first pound and $2.50 for each additional pound. how many pounds could be purchased with $29.00?
October 18, 2011

physics
At the airport, you pull a 18 kg suitcase across the floor with a strap that is at an angle of 41° above the horizontal. Find the normal force and the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction ...
October 18, 2011

math help me please!!!!!!!!!!!!!!!!
no affence esha but actually for that answer i would say thats wrong cause if you add it correctly its actually 1,442
October 18, 2011

Chemistry Lab
Suppose for the reaction of Cu(NO3)2 + NaOH, you have not added enough sodium hydroxide to precipitate all the copper as copper hydroxide Cu(OH)2. a)How could you tell that not all the copper had precipitated? b)what effect would this have on the final yield?
October 18, 2011

Calculus
I get 2(sqrt3/2)(1-(3/4)1^(4/3)) But that's not the answer.
October 13, 2011

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis and whose cross-sections perpendicular to the y axis are equilateral triangles. I asked this same question for the y-axis around the x-axis (Thanks for the explanation) but I ...
October 13, 2011

Calculus
I don't see any error, but webwork just says y= , I can't enter anything besides what y is supposed to be. The slope I took was a method I found in my book but it only says that, how to take the slope, and I don't even know if I had that right. But I cant enter ...
October 13, 2011

Calculus
Webwork asks me to enter an answer for y=
October 13, 2011

PLEASE I really need help!!!
I dont know what to do for this problem.
October 13, 2011

Calculus
Find the equation (in terms of x and y) of the tangent line to the curve r=3sin3(theta) at theta=pi/4. I dont know if I'm taking the right approach for this question but her goes what I did: I found the slope I got (9(-1/2)(sqrt3/2)+3(sqrt3/2)(1/2))/(9(-1/2)(1/2)-3(sqrt3/2...
October 13, 2011

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis and whose cross-sections perpendicular to the y axis are equilateral triangles. I asked this same question for the y-axis around the x-axis (Thanks for the explanation) but I ...
October 13, 2011

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis and whose cross-sections perpendicular to the y axis are equilateral triangles. I asked this same question for the y-axis around the x-axis (Thanks for the explanation) but I ...
October 13, 2011

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis around the x-axis. What I did was: V=ç(0,1)pi(1-x^3)^2 dx v=pi(x^7/7-x^4/2+x) and I evaluated it for one since 0 is just going to be 0. and I got 9pi/14 The answer ...
October 13, 2011

Calculus
Find the volume of the solid obtained by rotating the region bounded by y=x^3, y=1, and the y-axis around the x-axis. What I did was: V=ç(0,1)pi(1-x^3)^2 dx v=pi(x^7/7-x^4/2+x) and I evaluated it for one since 0 is just going to be 0. and I got 9pi/14 The answer ...
October 13, 2011

English
I was wondering if you could help me revise this? Questions plague the mind of many readers of why exactly Tessie Hutchinson was stoned in Shirley Jackson’s, “The Lottery”. This gruesome tale tells of an innocent woman stoned in a small village of 300 people. In...
October 11, 2011

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