Most popular questions and responses by steff
  1. Supply and Demand

    50) the monthly demand and supply functions for the Luminar desk lamp are given by p=d(x)= -1.1x^2 + 1.5x + 40 p= s(x)= 0.1x^2 + 0.5x + 15 respectively, where p is measured in dollars and x in units of a thousand. Find the equilibrium quantity and price.

    asked on June 6, 2011
  2. chemistry

    hi, I am wondering if benzyl acetate is polar or nonpolar? because it has a non polar benzene ring but also it has the ester bit attached so i am confused. Also i cant seem to understand the vander waal forces that are in it. if anybody could help that

    asked on December 18, 2006
  3. Supply & Demand

    42) Given the demand equation 3 + p -40=0 and the supply equation 2x - p + 10=0, where p is the unit price in dollars and x represents the quantity in units of a thousand, determine the equilibrium quantity and the equilibrium price.

    asked on June 6, 2011
  4. Derivative

    25) Suppose F(x) = g(2x^2 + 2). Find F(1) if g'(4) = -3. This is the question on my take home test. Seems to me that the question is wrong. Should it be f'(1) if g'(4) = -3? Your thoughts?

    asked on June 15, 2011
  5. Calculus (demand)

    18) The demand equation is x + 1/6p - 10+0. Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at p=50. a) 5; elastic b) 1/9; inelastic c) 7/6; elastic d) 6; elastic I choose answer A. Is that correct?

    asked on June 15, 2011
  6. Chemistry

    can anybody think of a reaction that involves benzyl acetate? formula is CH3COOCH2C6H5 i already have most of the synthesis's but i really need a reaction that involves this ester as a reactant NOT a product. thanks :) Why don't you just cleave the ester

    asked on December 20, 2006
  7. U-substitution (calculus)

    this is an example from the book. I do not understand where the 1/2 comes from in (1/2u)du. Find indefinite integral. ((.3x-.2)/(.3x^2-.4x+2))dx u=.3x^2-.4x+1 du= 2(.3x+.2)dx 1/2u(du)= 1/2 In u + c 1/2 In(.3x^2-.4x+2) + c

    asked on July 2, 2011
  8. derivative

    41) Find the derivative. h(x)= (3x^2 + 1)^3 / (x^2 - 1)^4 This is where I am at the moment.... h'(x)= (x^2-1)^4 (3)(3x^2+1)^2(6x) - (3x^2+1)^3(4)(x^2-1)^3(2x) This is what I am trying to get....(not final answer) =2x(x^2-1)^3(3x^2+1)^2[(9)(x^2-1) -

    asked on June 11, 2011
  9. chem

    what kind of intermol forces can be seen in this molecule CH3COOCH2C6H5 is it only dispersion? If you mean BETWEEN molecules, then the O of the carbonyl will be slightly negative and some hydrogen bonding could occur with another molecule. Remember a few

    asked on December 21, 2006
  10. Integration by parts

    integrate (e^x-x)^2 dx

    asked on July 13, 2011
  11. integration (calculus)

    Find the indefinite integral. ∫((e^-x-1)/(e^-x + x)^2) dx I am trying to use the substitution method. u=e^-x + x du= -e^-x+1 dx Right so far?

    asked on July 7, 2011
  12. derivative

    29) Find the derivative of the function. F(X)=2x^2(3-4x)^2 This is what I have so far. I am usually pretty good at simplifying but I am missing something here. f'(x)=2x^2(4)(3-4x)^3(-4) + (3-4x)^4(4x) Here is where I go wrong. (Answer from book)

    asked on June 11, 2011
  13. chem

    I have a really urgent question. I am wondering wheter or not esters are polar and what types of intermolular forces they have. can anybody answer this question nvm

    asked on December 19, 2006
  14. Calculus

    help! ∫((ln x^2)/x)) dx u= ln x^2 du= 2 ln x dx (?) Not sure how to set this one up?

    asked on July 7, 2011
  15. Calculus

    Am I right so far? G(x)=e^x sqrt(1+x^2) =e^x(1+x^2)^1/2 =e^x(1/2)(1+x^2)^-1/2(2x) + e^x(1+x^2)^1/2 So I used product rule, chain rule, and exponential function with base e

    asked on June 29, 2011
  16. Implicit (calculus)

    Can someone explain implicit differentiation to me like I am a kindergarten? I am not getting it. Any hints to help me understand better?

    asked on June 16, 2011
  17. derivative calculus

    Please help. f(t)=(4+√t)(4t^2-5) This is what I have so far... (4+√t)(8t)+(4t^2-5) (1/2t^-1/2) Am struggling to get this in factored form. Am working on a multiple choice take home test and nothing I am getting matches.

    asked on June 15, 2011
  18. Calculus derivative

    Find the slope and an equation of the tangent line to the graph of the function f at the specified point. f(x)=-1/3x^2+5x+5: (-1, -1/3) Answer: f’(x)=-2/3x + 5 y=-2/3x -1 I re-worked the problem and got f'(x)=5, y=5x+ 14/3 This is from a multiple choice

    asked on June 15, 2011
  19. Derivative Calculus

    I just need my answers checked. 1) Find the derivative. f(x)=3x^5/4 - 8/9x^9/8 + x^2 - 9x + 1 Answer: f’(x)= 15/4x^1/4 - x ^1/8 + 2x -9 2) Let f(x)= 7x^3 - 9x. Find f’(5) Answer: f’(x)=21x^2-9 f’(5)=516 3) Find the given limit by evaluating the

    asked on June 14, 2011
  20. science

    how do you figure out intermolecular forces in a molecule? 1. You learn (memorize) the types of forces and what causes them. 2. You go through example molecules with those forces. 3. You learn to recognize types of molecules (fats, covalent long chain,

    asked on December 19, 2006
  21. find the derivative

    3 In (√x + 7)

    asked on July 14, 2011
  22. calculus

    Just want to check and see if I am setting this up right. Let y=f(x)=x^2-6x Find the average rate of change of y with respect to x in the interval from x=4 to x=5 (5^2-6*5)- (4^2-6*4)/ 5-4

    asked on June 15, 2011
  23. reading

    where can i find the answers to a book i read ? The book is shark girl.

    asked on January 6, 2010
  1. math

    I love my mom

    posted on November 21, 2016
  2. french

    just missing some accents!

    posted on October 28, 2015
  3. find the derivative

    and help with this one... f(t)= e^7t * In (t+4)

    posted on July 14, 2011
  4. Calculus

    Thank you!

    posted on July 7, 2011
  5. integration (calculus)

    got it figured out.

    posted on July 7, 2011
  6. calculus

    Thanks. I am on my ipad and it is such a pain to type this stuff out. I get a little lazy.

    posted on June 15, 2011
  7. derivative calculus

    Thanks. I see my mistake now.

    posted on June 15, 2011
  8. derivative calculus


    posted on June 15, 2011
  9. Calculus derivative

    Thanks. I was missing the step where you plug in the -1 to get slope.

    posted on June 15, 2011
  10. derivative calculus

    Here are my options a) 10t^2+32t√t - 5 / √t b) 20t^2-64t√t - 5 / 2√t c) 20t^2+ 32t√t - 5 / 2√t d) 20t^2+64t√t - 5 / 2√t e) 10t^2-32t√t - 5 / √t

    posted on June 15, 2011
  11. Derivative Calculus

    Thanks. I will check my answer.

    posted on June 15, 2011
  12. derivative

    Should be =4x(3-4x)^3(-12x+3)

    posted on June 11, 2011
  13. Chemistry

    I found this but wasn't sure how accurate is was: 4.) There is a major effect of the nitrate ion in solution on the color emission because the nitrate ion is the oxidizing agent in the compound without it you could not produce a spectrum so there would not

    posted on February 24, 2011
  14. reading

    But i don't have the book with me.

    posted on January 6, 2010