Saturday
December 20, 2014

Posts by Rebecca


Total # Posts: 852

calc - yet another
If C is the curve y = x^2/2 + 1 from (0, 1) to (2, 3), then the line integral over C 3x ds = sorry for all the questions!
December 7, 2014

calc
If D is the solid region in the first octant bounded above by the paraboloid z = 1 − x2 − y2 and below by the xy-plane, the volume of D is: so i set this up integrating over dz dr dtheta and got pi/2 but the answer i spi/8
December 7, 2014

calc
4. Compute ∂z/∂r + ∂z/∂s if z = sin u cos v, u = (r + s)2, and v = (r − s)2.
December 7, 2014

calc
i figured this one out!
December 7, 2014

calc
3. If f(x, y)=5 − 4x3 + 8y2, find a unit vector ~u for which the directional derivative D~uf(1, 1) is zero. im not sure how to do this one
December 7, 2014

calc
ok so now i get that i did the integral wrong,. it should be 2e^t(sint+cost) but I get 2(e^pi -1) for sqrt2??
December 7, 2014

calc
I have another question (studying for finals, haha) Let ~r(t) = et cost ~i + et sin t~j be parametric equations of a curve C. Find the length of C from t = 0 to t = π. so the equation I am using is the integral from a to b (in thsi case 0 to pi) of the magnitude of r'...
December 7, 2014

calc
Give the equation of a plane containing the points (1, 0, 0) and (1, 2, 1) and parallel to the line whose equations are x = y, z = so i found n to be <0,1,2> then i used the equation n(r-ro) and got y-x+2z. the answer is x-y+2z =1. how do they get =1 and why is it x-y ...
December 7, 2014

programming urgent
so i have two arrays . I need to figure outh how to multiply each value of the first array by each value in the second array. how doy ou do thtisT? thanks
December 6, 2014

phys
virtual, upright, and diminished. I know this is the answer. Would someoen be able to explain why
December 4, 2014

phys
n object is placed 40 cm from a lens of focal length -10 cm. The image is virtual or real? inverted or upright? diminshed or enlarged?
December 4, 2014

calc
I get 618.6666 pi but it is wrong
December 2, 2014

calc
I have asked a couple questions about surface integrals but I was not able to fully understand what the person who answered was saying and/or their answer was not correct. If someone could please help me with this problem that would be great! evaluate the surface integral ...
December 2, 2014

calc
what is r ? the answer doesn't have r in it
December 2, 2014

calc
Evaluate the surface integral. double integral ydS S is the part of the paraboloid y = x2 + z2 that lies inside the cylinder x2 + z2 = 1
December 2, 2014

Chemistry
If 25.00 mL of 6.00 M HCl is transferred by pipet into a volumetric flask and diluted to 5.00 L, what is the molarity of the diluted HCl? a) 0.75 M b) 0.055 M c) 1.20 x 103 M d) 48.0 M e) 0.0300 M grams of solute/molar mass of solute/liters of solution?
November 20, 2014

Science
False
November 10, 2014

Science
Climate change studies suggest the worst impacts will be felt by the wealthiest people.
November 10, 2014

Science
The cost of renewable energy is currently about the same or less than traditional coal generated power.
November 10, 2014

Science
What is the central theme of the “As Cheap as Coal” portion in Section 8.1 of your text?
November 10, 2014

Science
Nuclear plants rely on a massive industrial infrastructure using fossil fuels. The answer can be found in Section 8.3 of your text.
November 10, 2014

Science
Which statement is true regarding nuclear energy?
November 10, 2014

Rational Functions
Write an equation for a rational function whose graph has the following properties: x-intercept of 3 y-intercept of -3 vertical asymptote of x=-2 horizontal asymptote of y=2
October 6, 2014

Physics
A 4.55 kg steel ball is dropped onto a copper plate from a height of 10.0 m. If the ball leaves a dent 2.80 mm deep in the plate, what is the average force exerted by the plate on the ball during the impact?
October 3, 2014

reading
What is an illustrated list?
September 18, 2014

Business
Which statement about Sarbanes-Oxley Act is true?
September 11, 2014

statistics
Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F occurs? The hint is to use Demorgan's laws
September 10, 2014

algeba
1/Q + 1/P = 1/B Solve for B. Can you tell me how to start this problem off?
August 27, 2014

College Algebra
A and B share a $21 pizza. B eats 2/3 as much as A. How much should they each pay. Hint: There is still some pizza left.
August 27, 2014

Alegbra
A & B Share a $21.00 pizza. B eats 2/3 the amount that A eats. How much should each person pay? There is some pizza left. I am thinking a+2/3b=$21.00 1 2/3 b =$21.00 b=$21.00divided by 1 2/3 b= 8.43 a= $12.57
August 27, 2014

Algebra
A phone company charges $30 per month for a long distance plan plus a charge of $.05 per minute. What would the monthly charge be for someone who talked two and a half hours?
August 8, 2014

Math
Financial aid students must pass 2/3 of their courses each term in order to continue their aid. If a student is taking 18 hours, how many hours must be passed?
July 20, 2014

Math
The entire can needs to be painted, including the top and bottom. If the diameter of the lid (x) is 5 cm, and the height of the can (y) is 9 cm, what is the approximate total surface area that will need to be painted?
June 17, 2014

Physics
Q: Japanese honeybees have a unique defensive mechanism against their natural predator, the giant hornet. When threatened by a hornet attacking the nest, worker bees will work together to surround the hornet, and then vibrate to create heat. If enough bees work together, the ...
May 8, 2014

Chemistry
You can purchase hydrochloric acid in a concentrated form that is 37.0 hcl by mass and has a density of 1.20g/mL. Describe how exactly you would prepare 2.85 L of 0.500 M HCL from the concentrated solution.
May 7, 2014

chemistry
I have two questions regarding enthalpy of reactions: 1.) Care must be taken when dissolving NaOH pellets in water because the temp. can rise dramatically. Taking NaOH as system, what can be deduced about the signs of the entropy of system and surroundings? Am I correct in ...
May 2, 2014

Chemistry
Based on the cell reaction: Zn(s)+Cu2+(aq)→Zn2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 55.0g of copper is plated out? Wmax=______ J
April 14, 2014

Chemistry
So I multiply Eu3+(aq)+e−→Eu2+(aq) by two so there is two e- in both half reactions. I also remember that I need to add H+ and OH- onto one or both sides depending if the reaction is acid or basic. How do I determine that?
April 14, 2014

Chemistry
Given the following half-reactions and associated standard reduction potentials: AuBr−4(aq)+3e−→Au(s)+4Br−(aq) E∘red=−0.858V Eu3+(aq)+e−→Eu2+(aq) E∘red=−0.43V IO−(aq)+H2O(l)+2e−→I−(aq)+2OH&#...
April 14, 2014

Chemistry
A voltaic cell utilizes the following reaction: 2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq). What is the emf for this cell when [Fe3+]= 3.70M , PH2= 0.95atm , [Fe2+]= 7.0×10−4M , and the pH in both compartments is 4.05? Express your answer using two significant figures...
April 14, 2014

World Civilization
1. In 1789, the National Assembly revoked the privileges of the aristocracy. This occurred in reaction to A. a peasant uprising. B. Louis XVI's withdrawal of troops from Paris. C. discontent among the poor people of Paris. D. the storming of the Bastille 2. What was ...
April 11, 2014

World History
1 - B 2 - D 3 - B 4 - C 5 - B 6 - C 7 - C 8 - A 9 - D 10 - C 11 - C 12 - B 13 - D 14 - D 15 - B 16 - C 17 - A 18 - A 19 - C 20 - A
April 11, 2014

World History
1. In 1964, a loose union of Palestine refugees led to the formation of the Palestine Liberation Organization (PLO) under Yasir Arafat. What was the aim of the PLO? A. Driving Israel from East Jerusalem B. Establishing a Pan-Arab League C. Evicting Israel from Palestine D. ...
April 11, 2014

Contrasting East & West
1 - D 2 - D 3 - C 4 - A 5 - C 6 - B 7 - A 8 - B 9 - C 10 - C 11 - D 12 - D 13 - D 14 - A 15 - C 16 - D 17 - A 18 - B 19 - A 20 - B
April 11, 2014

Contrasting East & West
1. In 1938, British Prime Minister Chamberlain declared a final act of appeasement A. after Hitler attacked Poland. B. when Hitler's claim on the Sudetenland was accepted. C. immediately following the Nazi occupation of Austria. D. after Hitler's forces occupied the ...
April 11, 2014

pen foster literacy
When using the Internet as an information source what u should remember
March 31, 2014

Chemistry
Okay... I already know that. I plugged in all the numbers and I get 8.2*10^22, which is not the right answer. Can someone show the work for the problem please?
March 25, 2014

Chemistry
The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k=1.6×108M−1s−1 at 4∘C. If the tropospheric concentrations of OH and CF3CH2F are 8.1×105 and 6.3×108 molecules ...
March 25, 2014

Chemistry
The concentration of Ca2+ in a particular water supply is 5.7×10−3M. The concentration of bicarbonate ion, HCO−3, in the same water is 1.7×10−3M. What masses of Ca(OH)2 and Na2CO3 must be added to 5.6×107L of this water to reduce the level ...
March 25, 2014

Algebra One
If r = 9 units and h = 7 units, what is the volume of the cylinder?
March 15, 2014

Statistics
Prev Up Next (1 pt) Suppose that in the year 2000, the cost of a compact car averaged $ 12600 and that in 2003, the cost averaged $ 14100. Assuming that the relationship between year t and cost c is linear, develop a formula for predicting the average cost of a compact car in ...
March 8, 2014

Physics
The answer is Vc/r = 0.380 m/s at 63.3 degrees south of west
February 23, 2014

Physics
A canoe has a velocity of 0.480m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.510m/s east relative to the earth. Find the magnitude of the velocity (V(C/R)) of the canoe relative to the river. Also, find the direction of the velocity of the ...
February 23, 2014

Math
Nissan Appliances bought three dozen camcorders at a cost of $5,040. The markup on the camcorders is 30% of the selling price. What was the original selling price of each camcorder?
February 22, 2014

Help finding a good speech topic
Obesity Cyberbullying Drinking and Driving
February 19, 2014

finance
the target capital structure for QM industries is 45% common stock, 5% preferred stock and 50% debt. If the cost of common equity for the firm is 18.9%, the cost of preferred stock is 10.7% and the before tax cost of debt is 7.7% and the firm's tax rate is 35% QM's ...
February 9, 2014

Wave
Henry is right. The answer is A, period.
February 8, 2014

Chemistry
How much heat energy, in kilojoules, is required to convert 63.0g of ice at −18.0 ∘C to water at 25.0 ∘C ?
January 26, 2014

physics
A ray of light goes through the centre of a semicircular glass disk, n = 1.58, and onto a wall (x = 19.4 cm, y = 5.06 cm). What is the incident angle, θ?
January 22, 2014

Government
What was the Court's reasoning in Marbury v. Madison?
December 5, 2013

density
Suppose two worlds, each having mass M and radius R, coalesce into a single world. Due to gravitational contraction, the combined world has a radius of only 3/4R. What is the average density of the combined world as a multiple of p0, the average density of the original two ...
December 1, 2013

Physics (algebra-based)
A child holds a candy bar 13.4 cm in front of the convex side-view mirror of an automobile. The image height is reduced by one fifth. What is the radius of curvature of the mirror? Answer in units of cm. I did 1/5=-image distance (i)/13.4-->i=-2.68 1/f=1/-2.68+1/13.4---->...
December 1, 2013

math
Marta's weekly pay for selling large screen televisions is determined by the formula S= $275 + 80n where s is her pay in dollars, and n is the number of large televisions she sells that week. If Marta's pay last week was $835, how many large screen televisions did she ...
November 25, 2013

sience
is coal renewable or non renewable
November 25, 2013

Government
What is the state-level equivalent of the president?
November 15, 2013

Government
Which is NOT a factor that reinforces America's two-party system? 1.)Broad ideological consensus limits the appeal of radical parties. 2.)The winner-take-all system makes it harder for third parties to gain popularity. 3.)The two-party system was preferred by the Founding ...
November 14, 2013

Government
well thank you! (:
November 13, 2013

Government
Which is not an argument in support of hate crimes legislation? a. Hate crimes legislation sends a message that the United States does not support bigotry. b. Hate crimes legislation ensures that perpetrators of these crimes receive serious punishment. c. Hate crimes are meant...
November 13, 2013

chem
What is the pH of 1.00 L of the buffer solution that contains 0.100 M HF and 0.120 M NaF after 0.020 mol of HNO3 is added? The Ka of HF is 3.5×10−4, and so pKa = 3.46.
November 11, 2013

Government
Explain the following quote "Liberty may be endangered by the abuses of liberty as well as by the abuses of power.". I have to answer questions about this, but I have no clue what it means..
November 5, 2013

physics
a projectile launched speed of 31.1m/s at angle 71.2 degrees above horizontal fill in table time 0 vx m/s 10.0m/s vy 29.4m/s ax? ay?
October 6, 2013

math
Quadrilateral ABCD has a perimeter of 26 and sides of integer lengths. If AB=m and BC=CD=DA=n, then what is the difference between the greatest and least possible values of n? A) 7 B) 6 C) 5 D) 4 E) 3
September 14, 2013

Physics
A particle starts at the origin at t=0 with an intial velocity of 5.0m/s along the positive x axis. If the acceleration is (-3.0,4.5) m/s^2, determine the velocity and position of the particle at the moment it reaches its maximum x coordinate. You can't use a calculator.
September 6, 2013

Maths Urgent please help
Sir Donald Bradman had scored 6996 runs in 69 completed test innings. he had one more innings to play. How many runs did he need to score in his final innings in order that his test batting average was greater than or equal to 100? You must write down the inequality that you ...
May 16, 2013

math
thank you
May 4, 2013

math
does that help please help me with this
May 4, 2013

math
the 10 is on one of the lines of the polygon then a line from the center goes from the center to the edge of polygon inside with a doted line
May 4, 2013

math
Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07
May 4, 2013

math
Find the area of the regular polygon. Round your answer to the nearest tenth. Question 18 (2 points) Find the area of the regular polygon. Round your answer to the nearest tenth. a 673.3 inches squared b 483.2 inches squared c 336.6 inches squared d 966.4 inches squared the 10...
May 4, 2013

Life orientation
Hiv and aids
May 3, 2013

Life orientation
Describe the life style disease/behavior and explain factors that contribute to the disease.
May 3, 2013

Science
During an experiment, you find that you can dissolve 3.6 g of a substance in 300 mL of water at 25°C. How much of the substance would you predict that you could dissolve in 600 mL of water at the same temperature? Can somebody help me with this? I don't get it.
April 25, 2013

Math
Kevin has 18 unit cubes. How many different rectangular prisms can be built using all the cubes
April 21, 2013

maths
A bomber takes off and flies at 500kph. A fighter, setting out 2 1/2 hrs later flies at 750kph. How long will it take for the fighter to catch the bomber, and how far will the bomber have travelled at this time?
April 16, 2013

maths
A bomber takes off and flies at 500kph. A fighter, setting out 2 1/2 hrs later flies at 750kph. How long will it take for the fighter to catch the bomber, and how far will the bomber have travelled at this time?
April 16, 2013

maths
A bomber takes off and flies at 500kph. A fighter, setting out 2 1/2 hrs later flies at 750kph. How long will it take for the fighter to catch the bomber, and how far will the bomber have travelled at this time?
April 16, 2013

Math- Probability HELP
Tom Cruise is reported to be 5'7.8" tall. Male heights are normally distributed with a mean of 70 inches and a standard deviation of 2.8 inches. Find the probability that; 1) A randomly selected male is Tom Cruise's height or smaller. 2) Three randomly selected ...
April 7, 2013

Biology HELP
How would the production of gelatinase help a pathogen be more virulent?
April 7, 2013

maths
The percentage of sugar in a solution of sugar and water is 9%. If 4 litres of this solution is diluted by adding 500mL of water, what is the percentage of sugar in the new solution?
April 7, 2013

grade 12 life orientation
Please help me ,i need answers.
March 30, 2013

ap calculas
derivative of (-x^3+3)(3x+2)^3
March 25, 2013

ap calculas
derivative of (2x^3+5)cos2x^5
March 25, 2013

Physics
An unknown material is submerged in a fluid with an index of refraction of 1.33. If a ray of light is incident on the block at 45-degrees and the angle of refraction is 30-degrees. What is the index of the unknown material?
March 6, 2013

INTRODUCTION TO CATERING
visual
March 6, 2013

math
carl has a box with a length width and height of 12 inches. she needs a box that is 4 inches longer, not as high, yet still has exactly the same width and volume. what are the new dimensions? which box requires more material to construct? PLEASE HELP ME!! :(
February 20, 2013

reading
The answer is 'C'. This is the only choice containing a "loaded" phrase that conveys an emotional portrayal. Read this choice again and note the mental image it creates.
February 19, 2013

Physics
What is the electrostatic force between a +1x10^-6C group of charges and another -2x10^-6 C group of charges located 0.3 m apart?
February 12, 2013

Physics
What is the electrostatic force between two ballons, each having 0.000005 C of charge, when they are 0.5 m apart?
February 12, 2013

Science
Laith notices that the air in his science classroom is much warmer than the air in his math classroom. Which statement describes how the air particles are different in his colder math classroom? A. They move faster on average B. They are vibrating C. They have less average ...
February 5, 2013

History
One major concern people had was that --------- were controlling politics at the expenseof the public good. Fill in the blank with one of these terms: Labor unions, Grover Cleveland, Chester Arthur, wealthy men, or James Garfield. I think that it is either Labor Unions or ...
January 21, 2013

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