Thursday

January 29, 2015

January 29, 2015

Number of results: 34,593

**Algebra 2 ..**

Solve the equation by completing the square. x^2-2=9x My answer: x=9/2+or- the sqrt. of 22.25 (but when I checked my answer the actual answer was x=9+or - the sqrt. of 89 and then all over 2) Please explain why my answer is different from the actual answer.
*December 25, 2012 by Anonymous*

**Algebra 2 ..**

Solve the equation by completing the square. 3x^2+4x=1 My answer: x=-2+or- sqrt. of 39 all over 3. When I checked my answer how come it was x=-2+or-sqrt. of 7 all over 3?
*December 25, 2012 by Anonymous*

**calculus**

Find the length of the arc formed by y = (1/8)(4x^2-2ln(x)) from x=4 to x=8. I found the derivative of the function and got y'= x-(1/4x) Where I'm lost now is after plugging it into the arc length equation: integral of sqrt(1+(x-(1/4x))^2). Squaring the derivative yields me ...
*August 24, 2008 by Arc Length*

**Calculus (Please check my work!)**

Suppose that y = f(x) = x^2 - 4x + 4. Then on any interval where the inverse function y = f-1(x) exists, thederivative of y = f-1(x) with respect to x is: (Hint: x^2 - 4x + 4 can be factored and rewritten as "something" squared.) Work thus far: Okay, so I know that I can ...
*March 15, 2012 by Anonymous*

**math**

1. The equation, in general form, of the line that passes through the point (3,4) and is perpendicular to the line 5 x + 5 y + 9 = 0 is Ax + By + C = 0, where a=? b=? c=? 2.The equation of the line that goes through the points ( -9 ,-6 ) and ( -6 ,-3 ) can be written in ...
*August 30, 2009 by Allie*

**algebra solving log equations**

n sqrt(x-8)= 5 I would like help to solve this what i did was to take away the square root i squared both sides coming up with (ln sqrt(x-8))^2= (5)^2 ln(x-8)=25 am i alowed to do this with ln in the equation? then i subtract 8 from both sides ln x = 17 e^(ln x)= e^17 e ...
*October 30, 2013 by Marcos*

**math**

thanks for the help but i was wondering (16 square root of x-3) times(square root of x-1) is equal to 16x-19 square root of x then plus 3 No, it is not. 16 (sqrt (x-3) ) (sqrt (x-1)) if that is your problem. It is hard to determine from your text. Use parenthesis please. 16 (...
*January 11, 2007 by jon*

**calculus BC slope**

consider the curve in xy-plane by x=e^t and y=te^(-t) for t is greater or equal to o. the slope of the line tangent to the curve at the point where x=3. all the answer choices are decimal points. a is 20.086, b is .342, c is -.005, d is -.011 and e is -.033 so what i did is ...
*April 22, 2007 by Anonymous*

**Physics**

suppose that the separation between speakers A and B is 5.80 m and the speakers are vibrating in phase. They are playing identical 135 Hz tones, and the speed of sound is 343 m/s. What is the largest possible distance between speaker B and the observer at C, such that he ...
*May 1, 2007 by Mary*

**math,correction**

Can someone help me with these...plz Simplify 2radical (12) + 4 radical (27) if i simplify radical (12) i get 2radical (3) then if i simplify radical (27) i get 3radical (3). so now i don't know if i'm doing this correctly or how to set it up... 2 sqrt 12 + 4 sqrt 27 4 sqrt 3...
*March 29, 2007 by jasmine20*

**Calculus**

integral 0 to sqrt(3) dx/sqrt(4-x^2) I don't understand why the answer is pi/6. I get pi/3. Thanks for the help! Work: u=x/2 du=1/2dx 2du=dx 2/2sqrt(1-u^2) sin^-1(x/2) sin^-1(sqrt(3)/2)= pi/3
*June 4, 2008 by Anonymous*

**math**

Line through (0,b) and (10,-5) is perpendicular to the line through (a,0) and (-6,-3). If all ordered pairs (a,b) which make the first sentence of this problem true are graphed, they all lie on a line. Find the equation of this line.
*September 17, 2014 by Sam*

**Calculus I**

Find the point on the curve y=x^2 closest to point (0,1) Here's what I have: Sqrt {(x-0)^2 + ((x^2)-1)} Sqrt {((x^2) + (x^2)-1} d= sqrt (x^4)-1 y= (x^4)-1 Fprime(x) = 4x^3 Domain = ARN Critical Number x= 0 Any help or comments would help alot. Thanks!
*November 2, 2007 by Mandy*

**Algebra II**

1) Write an equation of the line that passes through (9,6) and is perpendicular to the line whose equation is y=-1/3x+7. Answer: y=3x-21 2)Find x in the solution of the system 3x+y=2 ans 2x-3y=16 Answer:2
*April 6, 2008 by Lucy*

**math**

Please help me solve this problem... thanks! 1.Find the equation of the line that cntains the pont (5, -1) and has slope -1/2 2.find the equation of the line that passes through the points (-2,1) and (1,-5)
*October 26, 2009 by jojo*

**college alg**

find the equation of a line that is parallel to the line x=6 and contains the point (-8,9) please show work, it also wants me to show the answer in an equation
*September 4, 2012 by alli*

**Algebra**

What is the equation of the line that has a y-intercept of 5 and is parallel to the line represented by the equation below? 2x - y = 16 A. y = 2x + 5 B. y = -2x + 5 C. y = 1/2x - 5 D. y = -1/2x - 5 I guessed B for this one, but another choice of mine was A. I'm not sure which ...
*November 10, 2013 by ENGINE*

**math**

A graph is given with the line going from (-2, 2) to (2,8). a) Find the length of this line. b) Find the midpoint of the line. c) write an equation for this line. my answers- a) 2√10 b) 0,5 c) y = 1.5x + 5 please check these answers.
*May 31, 2013 by Anonymous*

**Algebra**

Write the equation of the line L satisfying the given geometric conditions. L has y-intercept (0,2) and is perpendicular to the line with equation 2x-3y=6 Show work I will be happy to critique your work on this. 3x+2y=4?
*May 20, 2007 by Linda*

**Math**

Give the equation of a line perpendicular to the line y = -8x + 8 having the y-intercept 2 units below the y-intercept of the given equation. At what point the two equations cross each other?
*January 9, 2010 by Anna*

**math**

Give the equation of a line perpendicular to the line y = -8x + 8 having the y-intercept 2 units below the y-intercept of the given equation. At what point the two equations cross each other?
*February 28, 2010 by Jillian*

**Advanced math-ck answer, please**

Write the standard form of the equation of the line that passes through (-3,7) and is perpendicular to the line with the equation y=3x-5. Answer: 3x+y=16 Thanks
*June 22, 2008 by Lucy*

**Analytic Geometry**

write the equation of a line through (4,1) and: A. parallel B. perpendicular to the line through (7,3) and (5,-1). =Express the equation in 5 different forms. please help!!
*January 14, 2011 by Anal-G*

**Algebra**

Find an equation of the line having the given slope and containing the given point. Express your answer in the form y=b or y=mx+b M=0, (0,-5) The equation of the line is y=
*February 11, 2014 by Pam*

**Trig(3 all with work)**

1)Find the exact value of cos 105 by using a half-angle formula. A)sqrt 2 - sqrt 3 /2 B)-sqrt 2 - sqrt 3 /2 C)-sqrt 2 + sqrt 3 /2 D)sqrt 2 + sqrt 3 /2 cos 105 cos 105 = cos 210/2 sqrt 1 + 210/2 sqrt 1 + sqrt 3/2 /2 sqrt 2 + sqrt 3/2 which is D 2)Find the solution of sin2 theta...
*February 15, 2008 by Jon*

**maths**

Find the largest possible value of sqrt[(x-20)(y-x)] + sqrt[(140-y)(20-x)] + sqrt[(x-y)(y-140)] if -40<=x<=100 and -20<=y<=200
*March 12, 2013 by John*

**Calculus**

I am doing the AP calculus review, these are the questions I have no Idea on how to do: 1. if 0<= k <=pi/2 and the area under the curve y-cosx from x=k to x=pi/2 is 0.2, then k= 2. let F(x) be an antiderivative of (ln x)^4/x If F(1)=0, then F(9)= 3. What is the equation ...
*December 11, 2006 by alamgir*

**calculus**

Use implicit differentiation to find the slope of the tangent line to the curve (y/x+8y)=x^8 +9 at the point (1,10/-79).
*October 29, 2009 by Jenny*

**Calculus**

Find those values of x at which the tangent line is horizontal to the curve y=xsqrt2-2cosx
*July 1, 2010 by Eileen*

**Calculus**

Find the x-coordinates of all points on the graph of y = x^3 - 4x^2 + 5x at which the tangent line is parallel to 2y - 10x - 7 = 0
*November 16, 2010 by Drew*

**CAL**

use implicit differentiation to find the slope of the tangent line to the curve (y)/(x-7y)=x^6+5 at the point (1,6/43)
*July 9, 2011 by Lan*

**math**

use implicit differentiation to find the slope of the tangent line to the curve (y)/(x-7y)=x^6+5 at the point (1,6/43)
*July 10, 2011 by lan*

**calculus**

y sin 12x = x cos 2y, (pi/2, pi/4) Find the tangent line to the curve at the given point. y=???
*October 9, 2011 by John*

**Calculus**

Use implicit differentiation to find the slope of the tangent line to the curve 2(x^2) + 2xy + 2(y^3)= -18
*October 28, 2011 by DJ*

**Calculus**

(y/(x+9y))= (x^2)-7 at the point (1, -6/55) Use implicit differentiation to find the slope of the tangent line to the curve
*October 28, 2011 by DJ*

**Calc**

how do you find which points a tangent line is horizontal/vertical for decartes folium x^3+y^3=3xy?
*December 8, 2011 by Anonymous*

**MATH**

Find the slope of the tangent line to the graph of the function at the given point. g(x) = 17 − x^2; (3, 8)
*February 13, 2012 by Anonymous*

**Calculus**

Find all the points (x,y) on the graph of f(x)=9x^2-36x+35 where the slope of the tangent line is zero.
*February 20, 2012 by Jaleela *

**Calculus **

I could really use the help on this as soon as possible. what is the slope of the line tangent to the curve (/x)^2 at point (4,16)
*February 24, 2012 by Jesse Stone*

**Calculus ap**

Use implicit differentiation to find the slope of the tangent line to the curve XY^3 + XY = 5 at the point (3,2) .
*March 2, 2012 by lily*

**Survey of Calculus**

For the function below, find the slope of the tangent line at x=2 (5x^(4)+4)/(-2x^(3)+7) Can someone explain how to do this?
*February 24, 2013 by Matt*

**Applied Calculus**

Let f(x) = x3 − 4x2. Find the point(s) on the graph of f where the tangent line is horizontal.
*March 1, 2013 by Jacob*

**Math **

Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 4 at the point (1,-3/13)
*March 14, 2013 by Melissa*

**Math **

Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 4 at the point (1,-3/13)
*March 14, 2013 by Melissa*

**calculus**

find a point on the curve x^3 + y^3 =2xy other than the origin at which tangent line is horizontal
*June 16, 2013 by susan*

**AP Calc. AB**

let f be the function given by f(x)=-2e^x^3. F0r what value of x is the slope of the line tangent to the graph of f at (x,f(x)) equal to -6
*January 7, 2015 by Rachel *

**Algebra - Functions**

Find the domain: a) [sqrt(x+3)]+[5x^2-180] b) [sqrt(x+3)]/[5x^2-180] c) (8x+9)(9x+8) d) (8x+9)/(9x+8) e) [sqrt(x+2)](5x^2-245) f) [sqrt(x+2)]/(5x^2-245)
*February 28, 2014 by Gregory*

**Geometry**

Hi, For one part of my problem I have had to find the equation of a straight line that passes through two points, I have done this but now i need to determine whether a new point lies on this line by using the equation from the first part, how would I do this please. The ...
*May 20, 2010 by Rich*

**Math (Equation of a circle)**

Find an equation of the circle with its center at (3,2) that is tangent to the positive x-axis.
*September 20, 2014 by Pao*

**Reading**

Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is ...
*November 14, 2011 by Bob*

**READING **

Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is ...
*November 14, 2011 by Bob*

**math**

sqrt of u- sqrt of v over sqrt of u+sqrt of v
*March 18, 2008 by Lilbean*

**algebra**

simplify: sqrt (2)/7 a) sqrt (14) / 7 b) sqrt (7) C) 2 d) sqrt (2)
*June 18, 2010 by ami*

**algebra**

simplify: sqrt 2/7 a) sqrt (7) b) 2 c) sqrt (2) d) sqrt (14) / 7
*June 21, 2010 by sean*

**algebra**

simplify: sqrt 4/5 a) 2 sqrt (5) b) 2 c) 2 sqrt (5) / 5 d) sqrt (5)
*June 22, 2010 by ant*

**algebra**

simplify; sqrt (6) / 11 a) 6 sqrt (11) /11 b) 6 c) 6 sqrt (11) d) sqrt (66) / 11
*June 23, 2010 by ant*

**algebra**

simplify: sqrt (6/11) a) sqrt (66/11) b) 6 sqrt (11/11) c) 6 sqrt (11) d) 6
*June 24, 2010 by kiddo*

**algerba**

simplify: sqrt (6/11) a) sqrt (66/11) b) 6 sqrt (11/11) c) 6 d) 6 sqrt (11)
*June 24, 2010 by anthony*

**alg**

simplify: sqrt (6/11) a) sqrt (66/11) b) 6 c) 6 sqrt (11/11) d)6 sqrt (11)
*June 26, 2010 by anthony*

**ALgebra 1**

4. Write the equation of a line whose slope is 6 and whose y intercept is -3. The answer would be y=6x-3 This is the y-intercept formula (y=mx+b) where m is the slope and b is the y-intercept. Thanx What about this one?Can you plz help? 6. What happens to the graph of the line...
*October 26, 2006 by Mary*

**Algebra**

Write the equation of the line passing through (3,10) and (3,-3) Notice the line is vertical. Equation is x= constant. You figure what the constant is.
*May 20, 2007 by Linda*

**algebra**

Find an equation of the line having the given slope and containg the given point m=8/9,(4,-7) The equation of the line is y=? Please help me with this. Thanks
*November 28, 2009 by muff*

**Geometry**

Write an equation of the straight line whose slope is 2 and whose y-intercept is the same as that of the line represented by the equation y=4x-2. What is it ?
*June 8, 2010 by Michelle *

**mathematics**

The circle x2-2x+y2-4y-4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation (x;y)-(x-8;y-6) of the points of the ...
*March 21, 2013 by Jossie*

**math**

4 sqrt(3) minus sqrt(64) plus 6 sqrt(27)
*May 27, 2008 by jaydee*

**algebra**

simplify: sqrt (90) a) 30 b) 3 sqrt (10) c) 10 srt (3) d) 9 sqrt (3)
*June 22, 2010 by sean*

**math**

simplify: sqrt 18/50 Would it be sqrt 18 / sqrt 50
*July 4, 2010 by Hannah*

**Math: Factoring**

3(1+x)sqrt 1/3 -x(1-x)sqrt -2/3 -------------------------------- (1+x) sqrt 2/3 please help
*September 15, 2011 by Ashley*

**math**

Simplify each of the following: 1. 16*(2^x)+2 2. 3[sqrt(x^1/4)*sqrt(x)/5*sqrt(x^2)] 3. ab^(2x+y)/a^x b^x
*May 28, 2012 by noel*

**Math**

Write the equation of the line in standard form: (-3, 6); m = 1/2 (1, 0) & (-5, 3) Write the equation of the line perpendicular to 4x 5y = -10 through the point(2, 3). Write the equation in slope intercept form.
*January 8, 2014 by Katie*

**Precalculus**

find the equation of the cubic equation show graph passes through the points (3,0) and (1,4) and is tangent to the axis at the origin??? I honestly cannot figure this out and can you explain the graph to me too?
*October 23, 2012 by Sam*

**math**

Find an equation of a line that is parrellel to the line of each equation: y=2x-7 y=-4x+5 y=x-3
*April 25, 2008 by Marianna*

**calculus**

First I would find the first derivative which is the slope and then would I plug in the given value into the original equation to find y and then use y-y_1=m(x-x_1)? Find the euation of the tangent line at the given value a) y=ln abs(x+4) x = -3 b) y= (x^2 +5)/(x+1) x=1 a) I ...
*May 2, 2007 by Tammy*

**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. lim h⇒0 5(7+h...
*June 14, 2011 by Steff*

**Algebra-Please check**

1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I think according to my calcs the answer is (9) The range of f(x) = sqrt(3x-6) - 2 answers would be y<= (-2) y>= (-2) y> (-2) y<=(2) I think the answer is y <= -2, correct I don't get this one at all: Solve...
*January 8, 2011 by Erica*

**math/algebra1a**

Write the equation of the line passing through (-3, -5)and (3,0). (a)y= -6/5x - 5/2 (b)y= 5/6x - 5/2 (c)y= 5/6 x + 2/5 (d)y= -6/5x + 2/5 You have to get the slope of the line using equation y2-y1/x2-x1. [0-(-5)]/[3-(-3)] = 5/6 Now that you have the slope, you have to solve for...
*May 26, 2007 by Confused*

**algebra**

Which choice is the equation of a line that has a y-intercept of 7 and is parallel to the line represented by this equation? y = 6x− 5 A. y = 6x+ 7 B. y = 6x− 7 the other two answers pertain to perpendicular lines, so i excluded them. i was going to select B, but ...
*November 10, 2013 by caduceus*

**precalc**

I;m not sure if i am doing this right...I keep getting a negative intersection point, which doesn't seem possible. Please help! a) find the equatoin of line 1 which passes through (1,3) and (9,7) I get y=3+1/2(x+1)or y=1/2x+2.5 b) the line 2 is perpedicular to line 1 and ...
*September 10, 2012 by Anonymous*

**calculus**

integration by parts: 1. e^(sqrt(3x+9)) 2. sin(lr) are the answers: 1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C 2. -r cos(lnr) + sin(lr) + C
*May 27, 2007 by cory*

**math**

integration by parts: 1. e^(sqrt(3x+9)) 2. sin(lr) are the answers: 1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C 2. -r cos(lnr) + sin(lr) + C
*May 28, 2007 by cory*

**algebra**

Solve: sqrt (3)b + sqrt (2) = sqrt (7)b - 10 a) none b) (3) c) (-3) d) (-4) i need to know if my answer is correct or not and the answer i picked is a thanks
*June 23, 2010 by kiddo*

**algebra**

Solve: sqrt (3)b + sqrt (2) = sqrt (7)b - 10 a) none b) (3) c) (-3) d) (-4) i need to know if my answer is correct or not and the answer i picked is a thanks
*June 24, 2010 by kiddo*

**Statistics**

σ = sqrt[ P * ( 1 - P ) / n ] = sqrt [(0.8 * 0.2) / 100] = sqrt(0.0016) = 0.04 z = (p - P) / σ = (.73 - .80)/0.04 = -1.75. What type of formula is this problem?
*May 4, 2014 by Linda*

**Calculus**

Find the slope of the tangent line to the graph of the function f(x)=x*e^x at x=3 correct to two decimal places.
*February 27, 2010 by kay*

**calculus**

If the graph of f passes through the point (1, 0) and the slope of the tangent line at(x, f(x)) is 4x − 3, find the value of f(2).
*April 11, 2010 by Garrett*

**maths **

Find the x-coordinates of all points on the curve y=2sin-sin^2x at which the tangent line is horizontal.
*October 29, 2010 by khela*

**Calculus**

Use implicit differentiation to find the slope of the tangent line to the curve 2x^22xy1y^3=3 at the point (11).
*November 5, 2010 by Trevor*

**Trigonometry**

Suppose the angle formed by the line 14y = 23x and the positive x-axis is č. Find the tangent of č.
*January 31, 2011 by Mike*

**calculus**

f(x)=3-5x , (-1,8) find the slope of the tangent line to the graph of the function at the given point how do you figure this out?
*February 11, 2011 by art*

**Calc**

The line y = mx+b with b≥2 is tangent to the graph f(x) = -2(x-2)˛ + 2 at a point in the first quadrant. What are all possible values of b?
*February 22, 2011 by Erica*

**math**

Which of the following four fundamental funtions have the same tangent line at x = 0 Ans:_________________ ? y = x, y = x2, y = x3 and y = ex
*August 31, 2011 by sarah*

**Calculus**

Could really use a lot of help here what is the slope of the tangent line to cos(x-y)=xe^x at point (0,3pi/2)
*February 15, 2012 by Johnathan*

**calculus anti-derivation**

Given that the graph of f(x) passes through the point (2,5) and that the slope of its tangent line at (x, f(x))is 3x+5, what is f(3) ?
*April 14, 2012 by lindsay*

**Math**

Find the slope of the tangent line to the curve 0x^2−2xy+2y^3=10 at point (-4,1) Help please? Thanks in advance
*November 17, 2012 by Ali*

**calc**

Find the slope of the tangent line at (8,8) for the function (16-x)y^2=x^3 Round your answer to two decimal places.
*October 24, 2013 by math*

**calculus**

Describe the slope of the tangent line to the curve defined by x 2 + xy - y 2 = 5 when x = 2. positive negative zero undefined
*February 23, 2014 by shira*

**Calc 2**

Find the length of the curve y^2=x^3 from the origin where the tangent line makes an angle of 45 degrees with the x-axis.
*February 26, 2014 by Chelsea *

**Rodriguez**

use implicit differentiation to find the slope of the tangent line to the curve of x^2/3+y^2/3=4 at the point (-1,3sqrt3)
*October 2, 2014 by Nancy*

**math 116**

a water line is given by the equation y = - 2/3x - 12 . Suppose you want to put a pink flamingo lawn ornament in your backyard, but you want to avoid placing it directly over the water line, in case you need to excavate the line for repairs in the future. Could you place it at...
*October 5, 2008 by Carmen*

**Pre-calc Solve logarithmic **

ln sqrt(x-8)= 5 I would like help to solve this what i did was to take away the square root i squared both sides coming up with (ln sqrt(x-8))^2= (5)^2 ln(x-8)=25 am i alowed to do this with ln in the equation? then i subtract 8 from both sides ln x = 17 e^(ln x)= e^17 e ...
*October 30, 2013 by Marcos*

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