Saturday
August 23, 2014

Posts by Rob


Total # Posts: 333

Computer Science
Using the operations push(E obj), peek(), pop(), empty() give a Java implementation of the method // Reverses the elements in the stack //and returns the result. // The stack passed as an argument to //reverse() will be // destroyed upon return. public static StackInt reverse...
March 11, 2010

calculus
This limit represents the derivative of some function f at some number a. Select an appropriate f and a. 1f(x) = x4, a = 4 f(x) = x1/4, a = 4 f(x) = x1/4, a = 256 f(x) = ãx, a = 256 f(x) = ãx, a = 16
February 24, 2010

calculus
plzzz help!!!
February 24, 2010

calculus
A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the velocity and speed when t = 9. f(t) = t ^-1 - t
February 24, 2010

calculus
Consider the function below. g(x) = 2 - x^3 (a) Find g'(0). (b) Use it to find an equation of the tangent line to the curve y = 2 - x^3 at the point (0,2).
February 24, 2010

College Physics
1/2 P(intitial)
February 8, 2010

trig
find the exact value of cos(theta) if the terminal side of angle(theta) contains the point (-3,5)
January 31, 2010

8th grade
a rabbit can climb one or two steps at a time on a ten step staircase, but he never goes back down. In how many different ways can the rabbit climb a flight of ten steps
January 26, 2010

Trigonometry
A little boy is flying a kite. The string of the kite makes an angle of 30 dgrees with the ground. If the height of the kite is h equals 15 m, find the length (in meters)of the string that the boy has used.
January 24, 2010

Trigonometry
i dont know..i just need help.
January 24, 2010

Trigonometry
A pole with a height of 60 ft. has a shadow of length of 34.64 ft at a particular instant of time. Find the angle of elevation of the sun at this point of time.
January 24, 2010

american government
what two actions could congress take to undo a supreme court ruling that a federal law is unconstitutional? explain the advantages and disadvantages of each action?
January 21, 2010

AMERICAN GOVERNMENT
EXPLAIN PRESIDENTIAL SUCCESSION STEPS.
January 19, 2010

AMERICAN GOVERNMENT
THREE CONSTITUTIONAL REQUIREMENTS TO BECOME PRESIDENT OF THE U.S.?
January 19, 2010

AMERICAN GOVERNMENT
LIST 6 MAJOR ROLES OF THE PRESIDENT?
January 19, 2010

AMERICAN GOVERNMENT
LIST FOUR FACTORS AFFECTING VOTER TURNOUT?
January 19, 2010

physics
9.8
January 17, 2010

american government
LIST FOUR FACTORS AFFECTING VOTER TURNOUT?
January 13, 2010

Chem answer check
Do these look right? What shape does an ammonia (NH3) molecule have?trigonal pyramidal In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none In a polar bond, electrons are? completely transferred What determines the polarity ...
November 24, 2009

Algebra
factor the expression csquared + 10c + 25
November 9, 2009

Algebra
csquared + 10c + 25 factor the expression...
November 9, 2009

Programming
Here is the source code for the Kitty class: public class Kitty { String name; int age; public Kitty(){ } public void setName(String n){ name = n; } public String getName(){ return name; } public void setAge(int a){ age = a; } public int getAge(){ return age; } } 1) The array ...
October 28, 2009

physics
Sorry i see the mistake I made for m the acceleration would be negative since its moving down
October 10, 2009

physics
from the FBDs wouldnt u get for M: Fy = N-WM=Ma Fx=T=Ma for m: Fy= T-Wm=ma Fx= T-W=ma then solve for a in M of Fx and sub a into m of Fx to get T?
October 10, 2009

Geometry
I need to invest on that calculator thanks Kerri
September 10, 2009

Geometry
that explains it better thanks Reiny
September 10, 2009

Geometry
what is the formula or how did you get that answer?
September 10, 2009

Geometry
The sides of a square each measures 4 ¾ inches. Find the area of the square as a fraction or mix number. (Do not use decimals)
September 10, 2009

Grammar
Are the following sentences punctuated correctly? Although, there is no definite evidence of malignancy, a biopsy should still be performed. He is incidentally, allergic to contrast material. Surgery, is not in my opinion indicated at this time.
July 18, 2009

Grammar
Are the following sentences punctuated correctly? The lung exam showed no rales, rhonchi or wheezes. She has a history of cough, not productive, that keeps her awake at night. The patient is a well-developed, well-nourished, badly sunburned cantankerous white male.
July 18, 2009

science
because it has a lot of gas in it??
June 6, 2009

science
which of the following is formed from molten rock that contains large amounts of gasses?? A: Rhyolite B: granite C:basalt D: pumice
June 6, 2009

Algebra
How do I do radical 7/10... my answer was 4 radical 3 over 6... is that correct?
May 10, 2009

MATH
24 pages
May 10, 2009

College Chemistry
[H30+] = 10^-(pH goes here) A log is an exponent. Since pH is a negative log, it's an exponent with a negative sign on it (with an implied base of 10).
April 26, 2009

Econ
In which of the following circumstances would a buyer be indifferent about buying a good? a. The amount of consumer surplus the buyer would experience as a result of buying the good is zero. b. The price of the good is equal to the buyer's willingness to pay for the good. ...
March 30, 2009

Econ
A result of welfare economics is that the equilibrium price of a product is considered to be the best price because it a. maximizes total revenue for firms and maximizes the quantity supplied of the product. b. maximizes the combined welfare of buyers and sellers. c. minimizes...
March 30, 2009

science
what do the tropic of capricon, tropic of cancer lines, artic, an antartic circles represent?
March 26, 2009

science
how were the latitudes of the tropic of cancer, tropic of capricorn, Arctic circle, and Antarctic circle determined?
March 26, 2009

science
heyy my friend rob needs help can u help him too?
March 26, 2009

math
Given: They collected 49 + 72 + 108 + 121 = 350 lbs of cans. So, the KNOWN part of the question is, “These folks collected 350 lbs of cans.” Answer: 10 I say the answer, 10, is really, “10 cents per pound.” Therefore, the UNKNOWN part of the question is, &#...
March 17, 2009

4th grade math
Sixty-five hundredTHs is 0.65 (0.065 would be sixty-five thousandths).
January 13, 2009

rehabilitation
under what circumstances is it easy to turn your will and life over to the care of god
January 7, 2009

Algebra
I have to solve the following equation: x+y=9 xy=54 I changed the first equation to y=9-x to solve for y. I got x(9-x)=54 and then 9x-x^2=54. I then changed 9x-x^2= 54 to -x^2 +9x-54=0. I got stuck around here, can someone explain...
January 2, 2009

math
hi i was wondering how would you find the equation of a parabola with it's vertex at -2,0, and with no directrix or focus given. the parobala opens toward the left. the two choices in my multiple choice answer sheet that sound the most logical would be x+2=-1/8y^2 and x-2=...
November 29, 2008

Trigonometry
cos2x(2cosx+1)=0 x=?
November 17, 2008

calculus I
thanks!!
October 19, 2008

calculus I
Find the tangent line approximation to 1/x when x=1 How do i find tangent line approximations??? my prof hasn't gone over this and i don't understand how to do it.
October 19, 2008

Caculus I
If f is decreasing and f(20)=10, which of the following must be incorrect? Explain. a. (f^-1)'(20)=-3 b. (f^-1)'(10)=12 how do i work this problem? i'm kind of confused about inverse functions.
October 19, 2008

6th grade advanced math
14
October 19, 2008

history
what items would you carry on a trip in the 15th century?
October 5, 2008

chemistry
dfgdfgdfsgd
September 8, 2008

calculus
Given f(x)=2x^3-7 find f^-1(x) and then find f^-1(-2) I though that this meant inverse function. x=2y^3-7 x+7=2y^3 (x+7)/2=y^3 ((x+7)/2)^(1/3)=y so this meant f^-1(-2) = 1.35721 The professor posted the answer as being 6. I'm not sure if I misunderstood the question or if ...
August 24, 2008

Math
For a period of time as an alligator grows, its mass is proportional to the cube of its length. When the alligator's length changes by 15.8%, its mass increases by 17.3kg. Find its mass at the end of this process.
August 19, 2008

Science
An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT? A) a ball striking a wall, in which the force of the ball on the wall is equal...
July 18, 2008

Science
Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...
July 18, 2008

HELP! ASAP! SPANISH!
i am writing a poem for spanish and in the poem we have to say a phrase about an animal. i have a crocodile. what is a good phrase that i can say in spanish about a croc? thanks sooo much!
May 18, 2008

history
in 1920 the republicans did something they hadn't done in a very long time. What was it?
April 28, 2008

Physics
List at least two major potential asvantages of power production by fusion rather than by fission.
April 25, 2008

Physics
Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.
April 25, 2008

Physics
If a pair of carbon atoms were fused, and the product were to emit a beta particle, what element would be produced?
April 25, 2008

Physics
Mixing copper and zinc atoms produces the alloy brass. What would be produced with the fusion of copper and zinc nuclei?
April 25, 2008

Physics
Which process would release energy from gold, fission or fusion? Which would release energy from carbon? From iron?
April 25, 2008

RECETAS
jugo de naranja? vas al supermarche
April 25, 2008

chemistry
How many grams of NaOH are present in 5.0 mL of a 1.0% (m/v) NaOH solution?
April 25, 2008

chemistry
thank you! Irvine is bomb Chem 1C is a bummer lol
April 7, 2008

Physics
Who was the scientist that invented the uncertainty principle ? Was it Heisenberg?
April 4, 2008

Physics
An electron and a proton are traveling at the same speed. Which one has the longer wavelength?
April 4, 2008

Physics
In the photoelectric effect, what determines the number of ejected electrons?
April 4, 2008

Physics
In the photoelectric effect, what determines the kinetic energy of the ejected electrons?
April 4, 2008

Physics
Which laser beam carries more energy per photon? red, yellow, green, violet? I think red. Am I right?
April 4, 2008

languages
are there any free downloadable courses that I could teach myself Arabic with? I can't seem to find any good ones.
March 28, 2008

math-patterns
Each number adds a digit: Example 6,38,932,1087,12437,123456,1234567,12345678,123456789, ect... The pattern is not the number itself, but how many numbers in each... Good Luck!
February 14, 2008

Chem
1)Br- + MnO2 + 3H2O Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + 48H2O Mn2+ + 32H3O+ + 6BrO3- 4)4Br- + 3MnO2 + 18H2O 3Mn2+ + 12H3O+ + 4BrO3- 5)Br- + 3MnO2 + 3H3O+ 3Mn2+ + BrO3- + 3H2O I got the first one. Is that right?
December 12, 2007

Chem
Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. 1)Br- + MnO2 + 3H2O --> Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ ---> 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + ...
December 12, 2007

Chem
Calculate the Go for the oxidation of 5 moles of tin in the following balanced reaction. 16HCl + 2KMnO4 + 5Sn ---> 5SnCl2 + 2MnCl2 + 2KCl + 8H2O
December 12, 2007

Is this how you derive the formula for arc length?
For a smal change in x, dx: ds² = dx² + dy² ds = sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy² * dx²/dx²)] s = INTEGRAL of sqrt[(1 + dy² * 1/dx²)] dx s = INTEGRAL of sqrt...
December 4, 2007

accounting
what is the most important step in the acounting cycle
December 1, 2007

Calc-Derivatives
I asked this before and did not get a response so I am trying again. (Note, I didn't know how to type the symbol for pi) What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in front of the r^4 and...
November 28, 2007

calc
What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in front of the r^4 and so you would just use the power rule.
November 28, 2007

Calc
Can this be factored: 6/5x^1/5 - 12/5x^-4/5 I am trying to find the values for X which will make this equal to zero. My factoring looks like this but not sure it is right 6/5x^1/5(1-2x^-1) so I get X= 0 and X=2
November 25, 2007

social studies
who does John Hancock resemble, and how?
September 30, 2007

Physics
Can two equipotentials ever cross one another? Explain via analogy to a topographical map Can two equipotentials be tangent to one another? What is the analogous situation in the case of a topographical map? What is your thinking on this? I will be happy to critique your ...
July 8, 2007

Physics
For a resonance tube apparatus (open ended on one side) with a total tube length of 1.00 meter, on a day when the speed of sound is 340 m/s, how many resonance positions will be observed as the piston position is varied for a frequency of 500 Hz? and 1000 Hz? Use the n as the ...
July 1, 2007

Physics
Why should a tuning fork be set into oscillation by striking it with a soft rubber mallet rather than with a hard metal mallet? Striking it with a hard mallet excites higher order modes rather than mainly the fundamental. That is because a hard mallet impact causes steep ...
July 1, 2007

Physics
Does centripetal force acting on an object in uniform circular motion do work on the object? For work, force must be in the direction of movement. Please stop posting under differing names.
June 18, 2007

chem expirement!
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of ...
May 17, 2007

chem experiment:
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of ...
May 17, 2007

Calc Help
I need to find dq2/dpb and dqb/dpa qa=2500+(600/pb+2)-40pa qb=3000-100pb+(400/pa+5) a and b are subscripts.
April 29, 2007

Calc Help
Marginal Cost = 30sqroot(x+4) with fixed costs of $1000. Marginal Revenue = 900. find profit or loss from production and sale of 5 units. how many units will result in a max profit? what is the max profit? Can someone please help. Trying to review for my final and really stuck...
April 29, 2007

Calc Help
demand = (p+1)sqroot(q+1)=1000. Find elasticity of demand at a price of $39 per unit. I am really struggling with this problem is there anyone that can help me? i am not familiar with the terminology, but if you are trying to solve for p, it is not that hard (p+1)√(p+1...
April 29, 2007

algebra
A bicyclist rode into the country for 5hr. In returning her speed was 5 mi/h faster and the trip took 4 hr. what was her speed each way? What equation would I use to solve this problem i have no idea Let V be her speed going out, so V+5 will be her speed coming back. Let the ...
March 23, 2007

calculus
i'm having trouble with a problem in my calc class...it isn't really calculus yet since we're still in the review section but it goes somethign like this: ( don't have it in front of me) a rational function is defined by: R/(x-K) where R and K are constants. ...
March 15, 2007

Calc Help
Find two functions that this could be the derivative of: y'=4x+7 Remember the derivative of any constant is zero. take its antiderivative i suppose... y= 2x^2 + 7x + any number
March 7, 2007

Calc Help
An agency charges $15 per person for a trip for groups of no less than 30 people. But for each person above the 30, the charge (for everyone!) will be reduced by $0.15. Write a revenue function for the agency usin x as number of people above 30. What size group will maximize ...
March 7, 2007

Calc Help
The daily sales, S, in thousands of dollars, is a function of the money, x, spent on advertising (in thousands of dollars) according to: S(x)= -x^3+9x^2+6/6. Find the x-coordinate of the point of diminishing returns. How much money is spent on advertising when you reach the ...
March 7, 2007

Calc Help
f(x)=x^4-16x^2. Is this function concave up or down at x=-2? I will be happy to critique your thinking.
March 7, 2007

Calc Help
Find the 4th derivative of y=4x^3-(2/x). Reads: 4x to the third minus 2 divided by x. I will be happy to critique your thinking. We dont do homework or tests.
March 7, 2007

Calc Help
Differentitate y= x^2(sqroot4x-3). Do not simplify. Reads: x squared times the square root of (4x minus 3)
March 7, 2007

Organic Chemistry
What is the product formed from a reaction of butanal and sodium hydroxide? cyclopentanone and sodium hydroxide? acetophenone and sodium hydroxide? Thanks. You want to look up information about the Aldol condensation.
March 6, 2007

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