Sunday
September 14, 2014

Number of results: 48,883

Pre-Calc
Can you show me how to find the rectangular equation of r=2costheta + 3 sin theta All I need is an example to work off I was absent today from Pre-Calc and I have homework to do and no explanation with them-Please help with this one Thank you
October 3, 2011 by Leah

Studying for Calc
I have a quiz on derivatives coming up and I really want to do well, but i'm not sure how to go about studying calc. i have no trouble studying for other subjects, but i'm doing poorly in calc and i need to make some changes in my study habits. any suggestions? i usually work ...
October 7, 2008 by Elizabeth

MATHS
A CONE WAS CONSTRACTED FROM PLASTIC, HAVE A HEIGHT OF 20cm (PART C). THE LID IS MADE UP OF HEMISPHERE HAVE RADIUS 0F 5cm (PART A) AND PYRAMID HAVE VOLUME OF 81,667cm³. THE LID FITS EXACTLY OVER THE CONE. A) CALC. THE VOL. OF PART A. B) CALC. THE VOL. OF PART C. C) CALC. THE ...
August 9, 2010 by MTHOMBENI BAFANA

Pre-Calc/Calc
Which set of parametric equations corresponds to this rectangular equation? y=2x-(x^2 / 10) A. x=4t, y=4t-(t^2 /10) B. x=2t, y=8t-(4t^2/10) C. x=2t, y=4t-(4t^2/10) D. x=.5t, y=2t-(t^2/10) E. x=t, y=t-(t^2/10)
April 17, 2013 by Chris Math Hw Help

Calc
Can someone help me with this calc problem? lim as x->0 (tan^3 (2x))/(x^3)
January 8, 2009 by Nick

help chem!:/
a) Calc. PH of 0.010 M HF and 0.030 M KF e) calc. PH Zn(OH)2 in wAter
March 15, 2012 by ALISON

Pre Calc
Does this: sqrt 3x-4=(x-4)^2-3 Multiply out to: x^4-16x^3+90^2-211x+173 I then need to put it in the graphing calc and see what the roots are.
September 10, 2009 by muffy

calculus (limits)
lim h>0 sqrt(1+h)-1/h not sure how to factor this; not allowed to use L'Hopital's Rule. (that isn't taught at my school until Calc II & I'm in Calc I).
January 22, 2011 by John

Calc
The total area enclosed by the graphs of y=10x^2-x^3+x y=x^2+19x Please Please help me solve this. I have done it amny times, but getting it wrong
January 25, 2011 by John

Pre Calc
please h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 2 5 7 6 7
December 7, 2009 by Jo

Pre Calc
March 15, 2009 by MW

Pre calc
January 25, 2013 by Joe

solve using identities for all angles (dont use multiple angle method)show work please cuz i am so confused. 2sin2x-3sinx=0
April 24, 2012 by Kimberly

Calc or Pre calc
I am having trouble doing this problem. I know how to do indefinate integrals, but I don't know how to do definate integrals. Can you show me how to do this. Evaluate 5 (x^3-2x)dx 2
May 14, 2008 by jennifer

Calc
find the limit as t approaches x of ((1/t)-(1/9))-(t-9).. help please thank you
February 10, 2013 by Anonymous

calc
May 1, 2013 by Anonymous

if 2x^2+2x+ xy =2 and y(2)=-5 find y'(2) by implicit differentiation
July 28, 2013 by Anonymous

Calc
The linear approximation at x = 0 to f(x) = \sqrt { 3 + 3 x } is y = Please Help!
August 5, 2013 by Anonymous

Logx16=-2 how do you solve this?
December 10, 2013 by Anonymous

Find the derivative of f(x) (csc(2x^2+1)^4
June 26, 2014 by Sarah

Math
If (a,-3) is a point on the graph of y=x^2+4x, what is the value of a? so far i have -3=x^2+4x i can do the problem on my graphing calc but we can't use a graphing calc on the test so i need to know how to do it by hand. what do i do next?
January 20, 2010 by Karen

Pre-Calc
I'm stuck on a pre-calc problem. I need to find y as a function of x, where the constant c is a positive number for In(y-1)+In(y+1)= -x+c express your question as ln[(y-1)(y+1)] = -x+c change that to exponential form e^(-x+c) = (y-1)(y+1) e^(-x+c) = y^2 - 1 y^2 = e^(-x+c) + 1 ...
May 9, 2007 by Sarah

Math
Please someone help with my pre calc question!
February 11, 2013 by Anthony

calc
Integrate 1/(ln(x)); f(e^e)=1 please provide step! confused because of f(e^e)!
May 8, 2013 by Sunny

Limit as x approaches zero (1/x-1/tanx)
June 26, 2014 by Sarah

Please help-I'm stuck really bad Thank you for any help you can provide What are the roots of the equation x^2 -4x + 3 = 0 x^2 - 4x = 3 x^2 +2(-2)x + -2^2 = -3 = -2^2 x^2 + -4x + 4 = 1 (x + -2)^2 = 1 qrt (x+-2)^2 = sqrt 1 x+-2 = plus or minus 1 therefore x=1 x=3 roots are 1 ...
September 6, 2011 by Sheila

calc
integral (x^2+x-1)/(x+1) dx can you please explain maybe not step by step but not just the answer please thanks
January 24, 2013 by kmac

Pre-Calc
May 22, 2011 by Emily

Pre-Calc
November 1, 2012 by Gaby

calc: avg value
Find the average value of the function "f(x) = x^2 sqrt(1+x^3)" on the interval [0,2]. and this is what i did.. please check for mistakes. thanks :D f(x) = x^2 sqrt(1+x^3), [0,2] f ave = (1/(b-a))*inegral of a to b for: f(x) dx f ave = (1/(2-0))*integral of 0 to 2 for: x^2 ...
July 2, 2007 by COFFEE

Calc
What is the equation of the tangent line of the one-family of curve x^2 + y^2 = 25 at P(4, 3) ?? help please
December 14, 2009 by Janice

pre calc
Simplify- (x^2+2x)/(x^2-x) *I got x(x+2) for the numerator and I couldn't get the denominator, but it was wrong help please
February 23, 2010 by Karissa

AP Calc
PLEASE ANSWER! PLEASEEEE! what is the antiderivative of sin (x + (1/x)) THANK YOU TIMES A MILLION!!!!
January 3, 2011 by APpreciative student

calc
Can someone please show me how to find the integral of sin squared x?
February 27, 2011 by lo

PRE CALC
May 15, 2011 by esora

pre-calc
cos x+sec x=2 if you could please show all work
November 20, 2012 by Haley

Pre Calc
In triangle ABC, b=14, c=15, and cos a= 3/5. Find a)side a b) Sin B Help please?
April 13, 2009 by MW

Pre-Calc
Determine the solution. x^2=|x|algebraically I have no idea how to proceed with this. Can you please help?
September 26, 2009 by MUFFY

Pre-Calc
September 18, 2011 by Josh

Calc 1
I need help solving for this final problem to complete my assigment. Please help! Solve for x: ln(x^4)-ln(x^2)=2
September 24, 2012 by arcos15

Evaluate the integral. integral 1/((x-2)(x+2)) Note: Use an upper-case "C" for the constant of integration. I keep getting 1/4[log(2-x)-log(x+2)]+C and the system is saying its wrong... Please help!
May 16, 2014 by Josh

f(x)=|x|+1 Let A(r) be the enclosed by the x axis, the line x=-2, the graph of the function f, and the line x=r for any r=>-2 A) Write A(r) as a piecewise function with its joints at r=0 Please walk me through each step i am really confused!!
September 8, 2014 by Lily

Calc
Find the domain. f(x)= 3 - 1/2x if x less than or equal to 2 = 2x - 5 if x > 2 Please help... an explanation would be wonderful, so I can understand how to do this.
September 14, 2010 by Chelsea

find the solutions of the equation that are in the interval [0,2pi) 2-cos^2x=4sin^2(1/2x)
November 4, 2010 by Hayli

Pre-Calc
Can someone show me how to do this please. I am stuck. find a number x such that e^2x – 12e^x =13
December 9, 2010 by Roy

Math-alg-calc
x^(-1/7)=(1/2) Please help the example given was x^(-1/7)=(1/5) so that solved x=78,125. but i have no idea what to do thanks!
April 5, 2012 by Rochelle F

Pre-Calc
I have to solve these using matrices by hand. Can someone please help me? 2x-3y-2z=4 (1/4)x-(2/5)y+(3/4)z=(-1/3) -2x+1.3y-3z=5 Thank you so much! :)
December 3, 2012 by Tori

Find the value of the definite integral using sums, not antiderivatives: int= integral sign int((x + 2)/(x^(3/2)),x= 16..25)dx Please help... even just showing me how to get started would be greatly appreciated.
April 5, 2011 by CM

calc
differentiate y=ln(x^5-e^x) Please show the steps in solving change it to y=ln u dy/dx= dy/du * du/dx and of course, dy/du= 1/u I will be happy to critique your work. 1/4x * 4/4x = 4/x Is this correct?
April 11, 2007 by quita

CALC BC
How do I find the derivative of x^ (1/(x-1)) is it (1/(x-1)) x^[1-(1/(x-1))] * (-1/ (x-1)^2) ?? If not, can you please write out what rule I should use? Thank you very much!
September 18, 2010 by APpreciate student

Calc.
November 15, 2010 by Chelsea

Calc
ex: Find the indicated derivative using implicit differentiation. e^x/y^2= 8 + e^y; dy/dx Please I need help and thank you very much!
October 2, 2011 by Ed

Math, Pre Calc
Given that (+-2) and i are the roots of a 4th degree polynomical, find the equation. Please help! Thank you:)
September 5, 2012 by Nikki

C code
Write a .c file named calc that: - Takes arguments from the command line - Solves a simple math problem - Returns the result as an exit status calc.c: //this is the function that gets called when the executable is run. int main(int argc, char * argv[]){ //I've given you the ...
February 6, 2013 by Nick

Pre-Calc
I am stuck solving this problem, any help please..Many thanks find all numbers x that satisfy the given equation ln(2x) ------- =2 ln(3x)
December 9, 2010 by Roy

Find the volume of the solid formed by rotating the region enclosed by y=e^(1x)+4, y=0, x=0 and x=0.2 about the x-axis? Ty
May 16, 2014 by Josh

How can this be proven! I have tried so many ways! PLEASE help! Verify using an example that Vector a + (Vector b • Vector c) = (Vector a • Vector b) + Vector c? Explain your reasoning.
July 1, 2008 by Sick Sick

Calc Help
May 1, 2007 by Evan

given x=2cos(t)+t*sin(t) and y=2sin(t)-t*cost(t), with t:[pi, 2pi] find all critical values. (4 answers)
May 20, 2007 by Mischa

Pre Calc
lim x approaches 0 [1/x *((1/(sqrt(1+x))-1)] It will be easier to understand if you write it out.. How would I algebraically do this? (The answer is -1/2) Help please?
March 18, 2009 by MW

calc
Consider the function f(t)=2sec^2(t)–10t^3. Let F(t) be the antiderivative of f(t) with F(0)=0. Then F(2) my problem is i get 2tan(t)-5/2t^4+c i plug in 2 and dont get the right answer please help
June 5, 2009 by sonia

Calc Help :(((((
March 12, 2014 by Kim

chemistry
liquid heptane C7H16 is completely combusted to produce CO2 and H2O: C7H16 + 11O2 --> 7CO2 + 8H2O the heat combustion for one mole of C7H16 is -4.85*10^-3 CO2 heat of comb. = -393.5 H2O h of c= -285.8 a) calc. the vale of heat of cumbustion for C7H16 in kJ/mol a .0108 mol ...
March 10, 2010 by hilde

Given the differential equation: dy/dx = y(1+x), y(0)=1, Use Euler's method with step size .1 to approximate y(.3). ... please check this for me! no one has responded to this question yet.. thanks. y' = y(1+x), y'(0) = 1(1+0)=1 ->the solution has slope 1 at the point (0,1...
July 2, 2007 by COFFEE

CALC HELP ASAP
suppose you need to construct a cone who surface area is 100 sq in. (A= pi*r*(sqrt( r^2+h^2), this is the amount of carboard needed to construct the cone. find values of r and h that will maximize the volume of the cone (V= (pi/3)r^2h Please help. explanations and steps please...
December 17, 2010 by CM

pre calc
area of triangle XYZ given:side z=11 side x=7 and side y=13 what are the angles and area please? please explain
December 8, 2011 by jim

Calc
Find an expression for the function whose graph is the given curve. The top half of the circle x^2 + (y-2)^2 = 4 Please Help. I don't even know where to start.
September 14, 2010 by Chelsea

Calc
Find f'(a). f(x)= (x^2 + 1)/(x - 2) So, [[(a + h)^2 + 1]/[(a + h) - 2]] - [(a^2 + 1)/a - 2] and the whole thing divided by h I tried simplifying it and ended up with [a + h/-2] - (a-2), which is incorrect. I used wolfram alpha and got (a^2 - 4a - 1)/(a - 2)^2 but I do not know...
September 28, 2010 by CMM

pre calc
write the form of the partial decomposition for the given rational expression. Don't solve for constants: 8x+10/x^2+7x-18 please show work!
May 12, 2011 by esora

Pre-Calc
Please help me solve these two equations!! Divide and express as a polynomial: 12a^8b^5 - 9a^14b^15 + 6a^6b^10 _____________________________________ 3a^2b^5 Simplify: a/b - b/a __________ a-b/b
November 27, 2013 by Maggie

Calc
Use DeMoivre's Theorem to find the indicated power of the following complex number (-6 + 6i)^4 Please help, i dont get this guys therom at all...
February 13, 2012 by Janique

Pre-Calc
For the triangle shown, find the length AD. (Assume u = 18, v = 18, x = 10°, and y = 10°. Round your answer to two decimal places.) Show work please!!!
April 2, 2012 by Mike

pre-calc helpppp
Evaluate the expression under the given conditions (show steps please) sin(è/2); tan è = − 5 / 12 , è in Quadrant IV
April 21, 2012 by John

Find the limit (if it exists). (If an answer does not exist, enter DNE.) lim f(x) as x approaches 3, where f(x)= x^2-8x+9 if x<3 -x^2+8x-21 if x>/3 (greater than or equal to 3)
January 16, 2013 by Amela

Calc
Find h'(2), given that f(2)= -3, g(2)= 4, f'(2)= -2, and g'(2)= 7 a) h(x)= 5f(x) - 4g(x) b) h(x)= f(x)g(x) c) h(x)= f(x)/g(x) d) h(x)= g(x)/1 + f(x) I have no idea how to plug these in. If someone could please show me how to go about one, I'm sure the rest would be nearly the ...
October 24, 2010 by Chelsea

Calc
Differentiate f and find its domain. Show step by step please! f(x)=lnlnln(x) Thanks!
March 16, 2014 by JuYoung

pre-calc
(1+tan x)^2= 2 tan x+2 please show all work
November 20, 2012 by Haley

Calc
Find the point on the line –2x+2y–3=0 which is closest to the point (–4–4). Please provide solution. ( , ) Thanks guys!
March 15, 2014 by Issac

CALC
Evaluate the integral: the integral of [5e^(2t)]/[1+4e^(2t)]dt. I used u sub and let u=e^2t and got 5/2arctan(e^2t)+C. But this answer is incorrect. Please help. Thanks
November 17, 2010 by Kristina

Pre-Calc
I am seeking help with this problem Please...Thank you! Find the point on the line y=x+3 in the xy-plane that is closest to the point (3, 2)
December 7, 2010 by Roy

CALC
I did post it wrong. sin(4x)/sin(x)=4cos(x)cos(2x). Verify the identity, please explain!
August 13, 2011 by JD

Pre-Calc
I'm so stuck-this stuff is so far above me right now-Please help (3x^3-5^2+6x-9)/(x+5) or can someone direct me to a site that can solve this and show the steps-I don't even know where to start Thank you
September 9, 2011 by Jonah

Calc I
How do I find the derivative for the sqrt(sin(e^(x^3)*cos(x)))??? I know this is a combination of the chain rule and product rule. Please help!
June 30, 2013 by Coolio

Please check this for me expand (3z-2b)^5 using Binomial Theorem (a+b)^n = n on top sigma in middle k=0 to right (n/k)a^(n-k)b^k (3a-2b)^5 = 5 on top sigma in middle k=0 on bottom(5/k)(3a)^5-k(-2b)^k (5/0)(3a)^5(-2b)^0+(5/1)(3a)^4(-2b)^1 +(5/2)(3a)^3(-2b)^2 +(5/3)(3a)^2(-2b)^3...
January 4, 2012 by Bethany

Given the curve x^2-xy+y^2=9 A) write a general expression for the slope of the curve. B) find the coordinates of the points on the curve where the tangents are vertical C) at the point (0,3) find the rate of change in the slope of the curve with respect to x I don't even know...
January 25, 2013 by Aparna

Pre Calc
find the magnitude and direction angle of the vector v, v=-2i+5j please help i have no idea how to do this. could you show me step by step?
June 2, 2010 by Nate

A particle moves along the s-axis. Use the given information to find the position of the particle. v(t) = 8t3; s(0) = 5.
December 19, 2010 by Elisa

Evaluate the indefinite integral. integral 2e^(2x)sin(e^2x) Note: Use an upper-case "C" for the constant of integration.
May 3, 2014 by Josh

Calc ii
Let f be twice differentiable with (f(0)=4), (f(1)=8), and (f'(1)=6). Evaluate the integral from 0 to 1 of xf''(x)dx\). I have no clue how to approach this since we dont know what the function is? please help, I've finished every other question and the assignemnt is due at 9
October 4, 2013 by Anonymous

Calc
Hi! Please help :-) Find an equation for the circle of the curvature of the curve r(t) = ti + (sint)j at the point (pi/2, 1) (The curve parametrizes the graph of y = sinx in the xy-plane)

CALC 2A
True or False. If f is continuous at 5 and f(5)=2 and f(4)=3, the the lim x-> 2 f(4x^2-11) = 2 the answer is true, but i do not understand why..because when i plug the numbers in im not getting what it has stated. Please explain thanks:)
February 7, 2012 by Student (UCI)

Evaluate the expression under the given conditions. tan(A+B); cosA=-1/7, A in quadrant 3, sinB=1/2, B in quadrant 2.
April 18, 2012 by Josh

I did some of them so can you help me with the rest. Consider the piecewise functon f(x) = (4x^2-3)/(3x^2-15) x<(-2) square root of(4-x^2) (-2)<-x<-(2) 5 x>2 lim x->-2^- f(x)= ?????? lim x->-2^+ f(x)= 0 f(-2)= 0 f(4) = 5 list the values of x for which f(x) is...
February 28, 2014 by Tim

Pre-Calc
Please check answer and help with one of them: 1. check please car in an accident speed of car is the s, d is length of skid=30 feet f is coefficient=0.5 use formula to find s=sqaure root of 30*f*d My answer is 21.21 because I took square root of 30(0.5)(30) 2. this one is ...
September 18, 2011 by Ellie

Pre-Calc
Please check answer and help with one of them: 1. check please car in an accident speed of car is the s, d is length of skid=30 feet f is coefficient=0.5 use formula to find s=sqaure root of 30*f*d My answer is 21.21 because I took square root of 30(0.5)(30) 2. this one is ...
September 18, 2011 by Elllie

Verify that the function satisfies the three hypotheses of Rolle's Theorem on the given interval. Then find all numbers "c" that satisfy the conclusion of Rolle's Theorem. f(x)=sin4pix , [-1/2,1/2] Well according to Rolle's Theorem, it has to be continuous on [a.b] and it is ...
April 14, 2007 by Julia

PRE-CALC
Determine the domain of the following function: f(x)=sqrt x-7/x^2-5x-6 I think the domain is [7,all real numbers) Can you please tell me if this is correct?
September 21, 2009 by MUFFY

calc
construct an isoceles triangle with an area of 100. what is the length of the base of the triangle which has the smallest perimeter? Prepping for a test, explanations please
December 9, 2010 by Tim

calc
construct an isoceles triangle with an area of 100. what is the length of the base of the triangle which has the smallest perimeter? Prepping for a test, explanations please
December 9, 2010 by C-help please asap