Thursday

July 2, 2015

July 2, 2015

Number of results: 53,521

**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*

**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**

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*

**Ap calc**

If y= e^x - e^-x / e^x + e^-x , then y'= Please help
*January 8, 2015 by Lynds*

**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**

Simplify (n+1)!/(n-1)! Help please?
*March 15, 2009 by MW*

**Pre calc**

Please finish y+7=6/7x-30/7
*January 25, 2013 by Joe*

**Pre-Calc**

Help please Find f(2) and f(a+h) when f(x)=3x^2+2x+4
*September 27, 2014 by Anonymous*

**Pre-Calc**

help please For f(x)=3x+1 and g(x)=x^2-6 find (f-g)(x) A. x^2-3x-7 B. 7+3x-x^2 C. 3x^2-17 D. -x^2+3x-5
*September 29, 2014 by Anonymous*

**pre-calc HELP PLEASE**

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**

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

**calc**

integrate 1/(1+(e^-x)) please provide steps
*May 1, 2013 by Anonymous*

**Calc Help Please **

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*

**Help please!! For pre-calc**

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

**Calc please help**

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

**Calc**

Please help with implicit differentiation. Find dy/dx for 4x^3+x^2y-xy^3 = -4
*October 16, 2014 by Jake*

**ap calc**

If y= (e^x-e^-x)/(e^x+e^-x), then y'= Please help i know how to get the derivative i just can not simplify.
*January 6, 2015 by anonymous*

**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*

**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-Please check my answer**

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*

**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*

**Calc please help **

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

**Pre-Calc/Trig**

Help Please Find (fog)(2) and (f+g)(2) when f(x)= 1/x and g(x)=4x+9
*September 28, 2014 by Anonymous*

**ap calc**

If f(x)=e^x, g(x)=sin(x), and h(x)=f(g(x)), then h'(pi/2)=? Please help I have no idea how to solve
*December 21, 2014 by Anonymous*

**AP CALC. AB**

(t^3)+(t^2)-16t+12 for 0<=t<=8 describe the particles motion when t=2 can u please tell me about it's maximum and its acceleration whether it speeding up, or slowing down, or whether its constant I know that it has a max of -8 but i don't know how they got it please help.
*December 3, 2014 by Darcy *

**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**

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*

**Pre-Calc**

Can you someone please help me with this question??? Simplify cot(x + pi)
*May 22, 2011 by Emily*

**Pre-Calc**

cosx/(1+secx) Please help me simplify this expression.
*November 1, 2012 by Gaby*

**Pre-Calc/Trig**

Help please State the x and y-intercepts for each function. f(x)= -x^3+4x
*November 10, 2014 by Anonymous*

**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 **

please help me solve this partial-fraction decomposition! 12x-57/(x-3)(x-10)
*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**

Please help stuck on this one question Find (fog)(2) and (f+g)(2) when f(x)= 1/x and g(x)=4x+9
*September 28, 2014 by Anonymous*

**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**

Please help me with this problem-I'm stuck (x-2)/(x+2) = (x+10)/x I'm not even sure where to start-Thanks for any help you can provide
*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*

**calc**

if f'(x)=3x^2-2x+1 and the graph of f(x) contains the point (2,2). find f(x). Please help I know I need to use integration
*January 19, 2015 by Anonymous*

**Calc Help Please**

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 *

**AP CAlc. AB Please helppp!! **

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*

**PRE CALC PLEASE HELP!!!!!!!!**

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*

**ap calc**

the graph of y= (ax+b)/(x-1)(x-4) has a horizontal tangent at the point (2,-1. Find a ANd B. Please help I have ne idea where to start
*October 8, 2014 by Anonymous*

**Pre-Calc/Trig...**

Help me please. Solve the equation: (x-3)(x+2)=0 Enter the solution with the lowest value.
*October 16, 2014 by Anonymous*

**Calc. Help Please.**

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.**

Use a linear approximation (or differentials) to estimate the given number. Tan 44 degrees Please help.
*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*

**Pre-Calc/Trig**

Helpp please State the domain and range of each of the following functions: 1. f(x)=1/(x+3) 2. g(x)=√x+6 3. h(x)=x^3+2x+5
*September 28, 2014 by Anonymous*

**ap calc **

the curve y=ax+ b/x has a relative minimum at the point (1,4). find the values of a and b. please help. I have no idea how to solve this.
*November 9, 2014 by Anonymous*

**AP CALC**

the curve y=ax+ b/x has a relative minimum at the point (1,4). find the values of a and b. please help. I have no idea how to solve this.
*November 9, 2014 by Anonymous*

**Pre-Calc/Trig...**

Help me please Is the given linear expression a factor of the polynomial? Show work. f(x)=2x^3+x^2-5x+2; x+2
*October 31, 2014 by Anonymous*

**Pre-Calc/Trig**

Help me please. List all possible rational zeros for the polynomial function. p(x)=3x^3-2x^2-5x-2
*November 7, 2014 by Anonymous*

**ap calc**

For the curve f(x)=xln(x)+ (1-x)ln(1-x), find the value of x in the interval 0<x<1 where f(x) has a minimum. Please help I have no idea how to solve.
*December 21, 2014 by Anonymous*

**Pre-Calc**

What are the asymptotes of the hyperbola (x+1)^2/4 - (y-2)^2/1 =1 I'm homeschooled, so the concept is hard to grasp. Show steps please.
*March 6, 2015 by Julissa*

**Pre-Calc.**

What are the vertices of the hyperbola x^2/9 - y^2/4=1 I'm not sure of how to start or what equation to use. Show steps please.
*March 6, 2015 by Julissa*

**math**

Hi, How do I improve my math skills? I can't calculate in my head (I.e 2x43), I would actually have to write it down to solve it. I took pre-calc, calc and didnt have problem understanding. I don't know what is wrong. what should I do?
*February 27, 2015 by john*

**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*

**Calc Help Please Again!**

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 *

**Pre-Calc/Trig**

Go over this with me please, I forgot how to do it. Solve the polynomial equation. 15x^3-119x^2-10x+16=0
*November 17, 2014 by Anonymous*

**Calc: PLEASE HELP!**

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**

q=(1000/p+1)^2 - 1 find q' Please help. Question on review sheet. I will be glad to help you, or critique your work. What do you think the way to solve it is>
*May 1, 2007 by Evan*

**calc- please help**

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 :(((((**

Find the derivative of the following function showing your work and fully simplifying your answer. Show steps please! Thank you!!!!!! f(x)=(x+3)^3(x-8)^5
*March 12, 2014 by Kim*

**Pre-trig/Calc**

Please help me. Use Descartes' rule of signs to describe the roots for each polynomial function. 3. m(x)=x^3+3x^2-18x-40
*November 9, 2014 by Anonymous*

**Calc**

∫ (2x+1)/(x+1) dx Please show steps if you work it. I think it's a partial fraction and worked with decomposition. Not sure though.
*March 14, 2015 by Janice*

**calc check please?**

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*

**ap calc**

if f(X)= 2X-X^2,if x<1 2x^2-4x+3, if >or equal to 1 find two values of c in the interval [0,2] that satisfy the mean value theorem. Please help I have no idea how to solve
*December 21, 2014 by Anonymous*

**ap calc**

find the volume generated by revolving the area bounded by y=-x^3, y=0, and x=-2 about the line x=1. I know how to the solve the problem but am not sure how to get the interval. Please help.
*February 28, 2015 by anonymous*

**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*

**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*