Saturday

February 28, 2015

February 28, 2015

Number of results: 101,982

**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*

**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*

**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*

**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*

**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*

**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 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*

**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*

**math calc.**

Differentiate g(x)=x^(2^1/2)+(x^3/2^1/2)+e^(2^1/2)+(2e^x)^1/2
*July 9, 2008 by nam*

**Math-Calc AB**

e^(-x/2) + xe^(-x/2) = 0 solve for x
*October 14, 2010 by Michelle*

**math/calc**

find y'' if x^4+y^4=16
*February 15, 2012 by angie*

**math pre calc**

solve for x. 8^6+3x=16
*March 25, 2012 by danielle*

**AP Calc B/C**

The base of a solid is the region enclosed by y=x^3 and the x-axis on the interval [0,4]. Cross sections perpendicular to the x-axis are semicircles with diameter in the plain of the base. Write an integral that represents the volume of the solid. I drew a picture, but I ...
*December 15, 2014 by Anon*

**Math Calc**

Find the linear approximation of f(x)=ln x at x=1 where L(x)=
*March 27, 2009 by Manny*

**math (calc 2)**

x+y=3 x-4=-(y-l)^2 rotate about the x-axis
*February 1, 2010 by sally*

**math-calc**

find third derivate f(x)=x/x+1
*February 27, 2011 by shakira*

**math calc**

integral of : x^2 square root of (x-1)
*May 16, 2012 by riss*

**math pre calc**

gaussian elimination x+Y+Z=-2 X-y+5z+22 5x+y+z=-22
*April 25, 2013 by JT*

**math pre calc**

solve for X marticies 2 0 5 4 -1 3 =2 6 x -7
*April 25, 2013 by JT*

**math-calc**

f(x)=(5x-4)e^2x How do you find the one critical number??
*March 13, 2009 by mkcolema*

**math 191- calc**

sect + tan t= (sqr 3)
*April 12, 2010 by krista*

**math-calc**

derivate of 2sin(x)-cos(x)-cot(x)
*February 27, 2011 by shakira*

**MATH, Calc**

P=0.3e^0.08t find the rate of growth.
*September 13, 2012 by Riley*

**Math**

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

**math calc!**

find the volume of solid bound by planes x=0 y=0 z=0 and x+y+z=7
*May 9, 2010 by college*

**Pre Calc , Math**

Find the 6 Trig ratios of -7Pie/3
*January 2, 2011 by Joe Daddy*

**Math Calc**

Find the tangent line to the curve (y-x)^2= 2y+4 at the point (2,6)
*August 18, 2011 by Lalee*

**Math**

(1/25)^1/2 i know the answer is 0.02 but how do you find it in a fraction without using a calc?
*September 25, 2011 by Allie*

**Math: Calc: Implicit Derivatives**

Find dy/dx give the relation (x^2/9)+(y^2/16)=1 Thank you!!
*June 14, 2012 by Joey*

**Math(pre-calc)**

what are all the real zeros for 1x^5+2x^4+4x^3+19x^2+9x-5?
*September 27, 2012 by Danii*

**math/calc**

gotta find the first and second derivative of f(x)=x^2/(x-1) thanks for help!
*October 18, 2012 by anon*

**math-calc**

f(x)=3-3x^2 -3 <= x <= 2 How do you find the absolute max and min value? What does x equal?
*March 13, 2009 by mkcolema*

**Math Pre-Calc.**

find the intersection between parabola: y=x^2 + 3x - 4 and line: y=5x + 11
*August 23, 2009 by Soraya*

**math-calc**

function f(x)=3x^2-2x-1 find equation of the line that is tangent and parallel to 8x-2y+12=0
*February 27, 2011 by shakira*

**math**

How do i find X in e^(0.50/x) on a scientific calc? do I use LN, and if so, could you pls tell me how I can plug it in?
*May 31, 2011 by sue*

**Pre-Calc/Math**

Prove the identit: cosxcotx+sinx=cscx
*April 30, 2012 by Yadira*

**Pre-Calc/Math**

If cosx= -2/3 and pi/2, find the exact value of cos(pi/3-x)
*April 30, 2012 by Yadira*

**Pre-Calc/Math**

Prove Identity: (1-cos2x/ tan x) = sin2x
*May 14, 2012 by Yadira*

**Math- Calc**

Find the volume of the solid formed by rotating the region enclosed by y=e^(4x)+2, y=0, x=0, x=0.8
*October 29, 2010 by Kristina*

**Calc**

Profit=p(-p^2+33p+9)-9(-p^2+33p+9)+100 How do I simplify this so I can take the derivative For Further Reading * Calc - Michael, Sunday, November 25, 2007 at 4:17pm Profit=p(-p^2+33p+9)-9(-p^2+33p+9)+100 p(-p^2 + 33p + 9) Just distribute the p in. -9(-p^2 + 33p + 9) Find the ...
*November 25, 2007 by Ben*

**math**

Solve the equation Vx + 7 +5=9 a) -3 b) 9 c) 23 d) 16 V= real number root aka 2nd x2 on graphing calc
*March 17, 2008 by john*

**math calc**

The equation of the tangent line to f(x) =sqrt{x} at x = 25 can be written in the form y = mx+b where m =.1 b =? i don't know how to find the value of b
*March 27, 2009 by Manny*

**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/Math**

Prove identity: (sec x/csc x) + (sin x/cos x)=(2/cot x)
*May 14, 2012 by Yadira*

**Math ( Pre Calc)**

Find all real and imaginary roots of the polynomial equation 3x^4-x^3+4x^2-2x-4=0
*October 2, 2012 by Ains*

**What is discrete math? And is it relatively easy?**

I ask because my TA recommended taking it next semester along with calc 3. My major is electrical engineering, and I might throw actuarial science into the mix too. So yeah, lots of math.
*December 18, 2007 by Jake*

**Math-Calc**

The lim as x goes to 0- for cos(x)/sin(x). I know the answer is negative infinity but I don't really understand why.
*June 8, 2011 by Marissa*

**math/Calc**

g(x)={1+cos(pi/2-x/1) 0 for-2 <or= x <or=2 for x<2 or x>2 is g(x) continuous at x=2 is it differentiable at x=2? ex[lain in detail I'm very confused as to how to solve this problem
*February 9, 2012 by angie*

**Pre-Calc/Math**

Given cos x=2/3 and 3pi/2<x<2pi, find the exact value of cos2x?
*April 30, 2012 by Yadira*

**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*

**physics**

an aeroplane is travelling horizontally at a speed of 80ms and drops a crate of emergency supplies.To avoid damage,the max vertical speed of the crate on landing is 20ms. a)calc d max height of the aeroplane when the crate is dropped b)calc d time taken for the crate to reach ...
*January 19, 2012 by Shanti*

**math-calc**

show that 1-(x/2) is the tangent line approximation to 1/sq rt(1+x) near x=0 i know the formula for apprx. is y = f(a)+f'(a)(x-a) but i don't understand how to work backwards to get this.
*October 19, 2008 by joe*

**Calc pt2**

Original question: Posted by Lost One on Tuesday, March 5, 2013 at 12:04pm. Let f(x) = (2/3)x^3 - 2x + 1 with a restricted domain of [1,infinity]. What is the value of (f-1)'(x) when x = 13? •Calc - Steve, Tuesday, March 5, 2013 at 12:58pm since x = f^-1(y) and dx/dy = 1/y' f...
*March 5, 2013 by Lost One*

**calc**

Use L’Hopital’s rule to find the limit of this sequence (n^100)/(e^n) ...If you do L'Hop. Rule it would take forever, right? You would always get an (e^n) at the bottom and will have to use the L'Hop. rule 100 times to find the limit...100*n^99, 9900n^98, and etc. Is there a ...
*February 1, 2012 by lola*

**Math/calc**

an electric current I , in amps is given by: I= cos(wt) + sqrt of 3 sin(wt) where w is positive constant. what are the max and minimum values of I?
*March 30, 2010 by Jolly :)*

**Math(Pre=Calc)**

The first term in a sequence of number is t1 = 4. The terms that follow are defined by the formula: tn - tn-1 = 3n -2. Determine the value of t50.
*July 6, 2011 by Kate*

**Math- AP Calc **

If 3x+xy+4y=8, what is the value of d^2y/dx^2 at the point (1,1)? My work: 3+(x)(dy/dx)+(y)+4(dy/dx)=0 dy/dx(x+4)=-3-y dy/dx=-3-y/x+4 2nd Dervative: (x+4)(0-dy/dx)-(-3-y)/(x+4)^2 (x+4)(-(-y-3/x+4))-(-3-y)/(x+4)^2 (x+4)(y+3)/(-x+4)+(y+3)/(x+4)^2 *Mult. everything by (-x+4) ...
*October 6, 2014 by David*

**Math Pre-Calc.**

Determine the domain and range of y= (radical) x-4 y= (radical) x^2-4 plz help me step by step. I just need to refreash my math, but i forgot how to find it
*August 23, 2009 by Soraya*

**math calc**

using geometry, calculate volume of solid under z= square root of 49-x^2-y^2 and over circular disk x^2+y^2 is less than or equal to 49
*May 9, 2010 by college*

**Math**

Express the following number in scientific notation: 23^941 How do i get the answer for this? on my graphing calc, i get an error overflow messasge when i try to compute it. THANK YOU!!!!!
*March 11, 2012 by Sandy*

**Math: Calc 2**

Find the volume of the solid obtained by rotating the region under the graph of the function f(x) = x^(13/12) about the x-axis over the interval [1,3]. Thanks!
*July 9, 2013 by James*

**Pre-Calc/Math**

Use factoring, the quadratic formula, or identities to solve cos(x)+1=sin^(2)x. Find all solutions on the interval [0, 2pi)
*May 23, 2012 by Yadira*

**Math Pre Calc Help**

(cos^4x -sin ^4 x)/(sin^2x)=cot^2x -1 How to prove true?
*November 10, 2014 by Anonymous*

**math**

evaluate: cos (arc sin (4/5) - arc tan 2) with out using a calc.
*April 15, 2010 by krista*

**Math: Calc**

y= 3x^2+3x+2 Find the diferential dy when x=4 and dx = 0.4 and when dx = 0.8. How do I find these diferentials? y= 3x^2+3x+2 dy= 6x dx + 3dx Now put in the values, and compute.
*November 16, 2006 by Katie*

**math (pre-calc)**

Solve for x: 1. 3^2x+3^x+1-4=0 2. log3(x=12)+log3(x+4)=2 3. lnx+ln(x+2)=4 4. 3*4^x+4*2^x+8=0
*April 18, 2010 by Rony*

**Math AP Calc**

The population of New Hampshire was 1 million in 1990. It doubles every 25 years. Estimate the population in 1996.
*August 29, 2010 by Leanna*

**Differential Calc (Math)**

Stuck... can't seem to use l'hopitals, nor can I use logrithmic differentiation... lim (e^(2x)+ x)^(1/3x) x->0+ Thank you so much
*December 13, 2012 by Joey*

**Math (Pre-Calc)**

Find all the solutions of the equation in the interval {o,2pi) 5sqrt3 tan x+3=8sqrt3 tan x
*February 8, 2015 by Fiona*

**pre calc math**

need to solve the first five terms recursively. Can do the other four once I get the first one. a[n]=a[n-1]/2 and a[1]=-8
*May 19, 2010 by Ken*

**Math- Calc**

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. y=e^(4x), y=e^(6x), x=1
*October 29, 2010 by Kristina*

**math (pre calc)**

4cot^2x-4/tanx+cosxsecx write expression in factored form as an algebraic expression of a singletrig function
*April 26, 2011 by josh*

**math/calc**

How do I solve for an area under the curve when y = x^2 and solve for above the interval (1,2) ? Any resources where I could see examples would be helpful. Thanks!
*July 18, 2012 by cathy*

**math- pre calc/trig**

Find the length of each side of a square if the diagonal is 7(square root 2)? How do I solve or set up this problem?
*September 30, 2014 by jen*

**Math (Calc)**

Find the Exact value of Pi/24. I'm not sure whether to use a half-angle formula or a difference/sum of angles formula.
*December 9, 2007 by Bryan*

**Math - Pre-Calc**

So far I got it down to ((4/3)n^3+(11/6)n^2)/((4/3)n^3)+(2n^2)+(2/3)n). Would I be able to cancel out the ((4/3)n^3)s? So that it would be ((11/6)n^2)/((2n^2)+((2/3)n))? Or can I simplify that even futher by combining the (n^2)s?
*April 13, 2009 by Katie*

**Math Calc**

Given a right triangle ABC with a=13 and b=26, find the value of angle A, angle B, and side length c. Round to the nearest thousandth.
*November 2, 2014 by Johnny*

**math, calc 2**

Using the disk method, find the volume of a right circular cone with height h and base radius r. I know the answer is 1/3pier^2h, but how do you explain or work out the problem?
*January 17, 2007 by George*

**Math Calc 1 Last question **

Find the volume of the solid obtained by rotating the region bounded by the curves y=4x-x^2, y=8x-2x^2 about the line x=-2. I got 256 pi/3 but pretty sure my work is wrong.
*December 12, 2012 by Anonymous*

**AP Calc**

When a chain hangs under its own weight, its shape is catenary. The equation of a catenary with a vertex on the y-axis is y=e^x+e^-x. Find the length of the chain from x=-2 to x=2. Then use the same technique from Problem #8(Previous AP calc problem I posted) to find the ...
*July 31, 2014 by Anon*

**math**

One of the following functions is neither odd nor even. Which one? x^5 + 3x 6x^2 – |x^2| + 3 x^9 + 3x^7 + 6x (my answer)x^2 + 3x + 3 + |x –3| This is really tricky pre-calc graphing problem. Thanks for the help!
*October 1, 2012 by Anonymous*

**math-calc**

A rectangle is inscribed with its base on the x-axis and its upper corners on the parabola y+1-x^2. What are the dimensions of such a rectangle with the greatest possible area? width? height?
*March 13, 2009 by mkcolema*

**math**

ok so i havent done domain and ranges for a while so i need some help this is just a generic question but i want to make sure i know how to do them before starting calc so can someone please explain how i would heres a function f( t) = t+ 3 /(t2 – 5t – 66),
*August 24, 2012 by kieran*

**Calc**

A student is in a 20 week calc class. The function f(t)=50-50e^0.2t f(t) measures the students problem speed in t weeks -how many problems per hour can a student solve at the beginning of the course - how many problems per hour can a student solve halfway through the course -...
*July 20, 2012 by Marshall*

**math 234 calc 4 !!!!!!!!!!!**

write this function in terms of heaviside functions, and then show your work in finding its laplace transform f(t)= o if o < t<3 t-3 if 3lessthan or equal <lessthan or equal to t < 6 o if 6< t < infinity
*April 12, 2011 by john *

**Math (Calc)**

Find all solutions to the following equation on the interval 0<=x<=2PI 8cos^2(X)sin^2(X) + 2cos^2(X) - 3 = 0 There are 8 solutions. If somebody could show me how to do it and not give me the answers, that would be great.
*December 9, 2007 by Bryan*

**math**

1.) What is the square of âˆš10? 2.) Find tan 14. 3.) Find cos 45. some one told me to use a scientific calculator and it would give me the answer but i can't find my calc.
*June 12, 2010 by Unknown*

**math calc Lagrange**

find points on surface z^2=xy+1 are closest to point (4,2,0) List points as comma-seperated list.
*May 9, 2010 by college*

**math pre-calc**

find an expression for sin (5 theta) as a fifth degree polynomial in the variable sin(theta) ?
*January 19, 2013 by aparajita*

**calc**

f(x)=7x-4 a) f(0) b) f(-3) c) f(b) d) f(x-1)
*October 4, 2009 by kim*

**calc 2**

(dy/dx) + 8y =5
*March 24, 2010 by Anonymous*

**calc 2**

(dy/dx) + 8y =5
*March 24, 2010 by Anonymous*

**calc 2**

(dy/dx) + 8y =5
*March 24, 2010 by Anonymous*

**calc 2**

(dy/dx) + 8y =5
*March 24, 2010 by Anonymous*

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