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December 21, 2014

Posts by Steff


Total # Posts: 35

find the derivative
and help with this one... f(t)= e^7t * In (t+4)
July 14, 2011

find the derivative
3 In (√x + 7)
July 14, 2011

Integration by parts
integrate (e^x-x)^2 dx
July 13, 2011

Calculus
Thank you!
July 7, 2011

Calculus
help! ∫((ln x^2)/x)) dx u= ln x^2 du= 2 ln x dx (?) Not sure how to set this one up?
July 7, 2011

integration (calculus)
got it figured out.
July 7, 2011

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?
July 7, 2011

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
July 2, 2011

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
June 29, 2011

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?
June 16, 2011

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?
June 15, 2011

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?
June 15, 2011

calculus
Thanks. I am on my ipad and it is such a pain to type this stuff out. I get a little lazy.
June 15, 2011

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
June 15, 2011

derivative calculus
Thanks. I see my mistake now.
June 15, 2011

Multiple choice options
added
June 15, 2011

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
June 15, 2011

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.
June 15, 2011

Calculus derivative
Thanks. I was missing the step where you plug in the -1 to get slope.
June 15, 2011

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 test and this ...
June 15, 2011

Derivative Calculus
Thanks. I will check my answer.
June 14, 2011

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 derivative. ...
June 14, 2011

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) - (4)(3x^2+1)} Am really ...
June 11, 2011

derivative
Should be =4x(3-4x)^3(-12x+3)
June 11, 2011

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) =4x(3-4x)^3(-12+3) Thanks ...
June 11, 2011

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.
June 6, 2011

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.
June 6, 2011

reading
But i don't have the book with me.
January 6, 2010

reading
where can i find the answers to a book i read ? The book is shark girl.
January 6, 2010

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 be an emission ...
December 16, 2008

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 nights ago you asked ...
December 21, 2006

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 and make the ...
December 20, 2006

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 thru example molecules with those forces. 3. You learn to recognize types of molecules (fats, covalent long chain, dipoles, etc).
December 19, 2006

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
December 19, 2006

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 would be super A little ...
December 18, 2006

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