March 29, 2017

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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 didn't have problem understanding. I don't know what is wrong. what should I do?
February 27, 2015 by john

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

August 9, 2010 by MTHOMBENI BAFANA

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

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

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

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

1, A Body Of Mass 6kg Was Acted Upon By A Constant Force Of 18N. Calc Its Velocity In 5sec. 2. A Car Moving At 108km/hr Was Gradually Brought To Rest By Constant Force Of 2500N After 8sec. Calc The Decelleratio
July 12, 2016 by Jane

physics -damon help
An ac source of 50v,100÷πHz is connected in series with an inductor of inductance L ad a resistor of resistance R.the current in the circuit is 2A ad p.d. across L and R are 30v ad 40v respectively 1) calc d average power dissipated 2) calc d power factor in the circuit
November 3, 2016 by maths

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

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

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

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

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
Suppose f(x)= |x^(2)+2x−63|. Where is f(x) not differentiable?
February 9, 2016 by kim

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

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

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

0.4771=x/2.303*8.14[50/323*373 calc.-x?
May 28, 2015 by tanya

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

(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

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

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

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

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

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

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

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

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

limx->0 (3^x-6^x)/x please help here do not really know where to even start
June 2, 2016 by Anonymous

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- 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

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

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

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

f(x)=7/(ln(x^2+5)) find f'(1) Cant seem to be getting the right answer. I believe can I get help finding the derivative.... thank you
June 1, 2016 by Jeff

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

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

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

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

Find an equation of the tangent line to the curve 2(x2+y2)2=25(x2−y2) (a lemniscate) at the point (3,1). Please help.
May 26, 2016 by Linda

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

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' ...
March 5, 2013 by Lost One

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

y^2+xy-3x=-5 dy/dt=-4 x=3 y=1 find dx/dt. i tried doing 2y(dy/dt)+ydx/dt-3=0 but i am not getting the right answer. Please tell me where i am going wrong.
May 24, 2016 by Brittney

Evaluate the limit using l'hospitals rule. lim->0 (3^x-6^x)/x. Do not know where to even begin on this one... please help.
June 2, 2016 by Lisa

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...
February 1, 2012 by lola

This is the last question on my pre-calc homework, I looked through the textbook and have no idea how to do this. Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one ...
March 5, 2015 by Cat Jones

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 :)

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 Calc
given the relationship 2x^2 + y^3 =10, with y > 0 and dy/dt = 3 units/min., find the value of dx/dt at the instant x = 1 unit. SUPER CONFUSED DONT GET THE EQUATION!!!!!!!
January 5, 2017 by Ke$ha

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

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

math- pre calc
Suppose that (x,5/13) is a point in quadrant 2 lying on the unit circle. Find x. Write the exact value, not a decimal approximation.
April 21, 2016 by Julia Hunt

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

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

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

Suppose that f(x)=6x(3−2x)3. f(x)=6x(3−2x)3. Find an equation for the tangent line to the graph of ff at x=1x=1.
May 26, 2016 by Phil

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

The graphs of the function f (given in blue) and g (given in red) are plotted above. Suppose that u(x)=f(x)g(x) and v(x)=f(x)/g(x) Find each of the following:u(x) and v(x)..
May 26, 2016 by Jenny

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

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

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

this is pre calc arithmetic sequence. AT sea lvl pressure is 14.7 psi. It increases by 14.7 at every 30 ft descent. What is pressure at 1000 ft.
February 14, 2016 by ISOSMEXY

Math, Calc
Use implicit differentiation to find an equation of the tangent line to the curve at the given point x^2+2xy+4y^2=12. Point (2,1). (Eclipse)
September 7, 2016 by Dani

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