Friday

November 27, 2015
Number of results: 25,601

**precalc**

i also need help with these two questions: 1/r=1/r1 +1/r2 solve for r1 and: f= G(mM/r^2); solve for m
*September 27, 2015 by rebecca*

**PreCalc**

Solve each inequality: (1/(2b+1)) + (1/(b+1)) > (8/15) (2/(x+1)) < 1 - (1/(x-1)) My teacher told me the answer is in interval notation, and that a number line is used to solve.
*January 10, 2015 by John*

**precalc**

1. Solve |2x + 5|< 9
*November 3, 2009 by kim*

**precalc**

solve x/x^2-4 - 1/x+2=2
*December 7, 2011 by 95*

**Calc/Precalc**

Find the derivatives of 1. ln[(2x^3⋅2e^x)] 2. xy = cot(xy) 3. y = cos(x^3 + 27) I don't really know where to start with these. The answer is (3+x)/(x) for the first, y/-x for the second, and 35. -3x^2 sin(x^3 + 27) but I have no idea how they got there. Thank you!
*May 7, 2015 by Heather*

**PreCalc**

Solve for the variable m^2 + 2m +3 > = 0
*December 12, 2007 by LT*

**PreCalc**

How do i solve for the variable 3x= sqrt5x+1
*December 12, 2007 by LT*

**precalc**

Solve sinx+cosx=0 Thanks!
*March 6, 2008 by Andrea*

**precalc**

how do u solve for this? sqrt(-10i+12)
*October 14, 2008 by Samya*

**Precalc**

(2^(x))(5)=10^(x) steps too please how to solve
*February 2, 2011 by Amy~*

**precalc**

solve the system of equations: x^(2)+y^(2) = 12 xy = -4
*April 7, 2011 by Haley*

**precalc**

How do you solve log5 sqrt125?
*April 26, 2011 by Ashley *

**algebra**

Solve the indicated variable: 1. Volume of a cone: solve for h: V=¨ir^2h/3 2. Temperature formula: solve for C: F=9/5C+32 pleaseeeee help me solve these! plzzz! i have nooo idea how to do these. THANKS! =)))
*September 20, 2009 by kitty kat*

**Precalc**

I have a couple questions, I need to know how to solve these type of problems. X^2 -4< X + 16 5/n+2 - 5/n = 2/3n 2X^3-x^2-6X + 1/ X^2 + 5x - 8 1) rearragne the terms to get x^2-x-20<0 (x-5)(x+4)<0 which means that one term can be negative, or -4<x<5 check that. ...
*June 14, 2007 by <3 A*

**precalc**

Solve log subscript4 112 = x.
*September 1, 2010 by Anonymous*

**Precalc**

how to solve 5(2^(3x)) = 8 Steps too please answer is ln 1.6 / 3 ln 2
*January 26, 2011 by Amy*

**Precalc: Logarithms**

Solve for x? xln(x) + 1 > x + ln(x) e^1/x > 1 Any help would be appreciated. THANK YOU!
*August 3, 2008 by Joe*

**Precalc.**

solve the equation on the interval [0,2pi) sin^2x=1
*March 19, 2010 by Anonymous*

**Precalc**

There's f(x) = (2x+3)/(x+4) and g(x) = (4x-3)/(2-x) Solve for x in f(g(x)) I tried this but I could not end up with the answer being x
*January 6, 2011 by Anonymous*

**Precalc**

how to solve for x: 500e^(0.3x) = 600 Steps please.
*January 26, 2011 by Amy*

**Precalc (complete the squares)**

(2x+1)^2 +4=0 solve the equation. help please :(
*November 11, 2011 by Cindy*

**precalc**

solve 5^y=4^y+3.Round your answer to the nearest tenth.
*January 14, 2012 by 95*

**Precalc**

Solve the following equation for x in terms of ln and e. (2e^3)-6-(16e^-x)=0
*March 3, 2014 by Aly*

**precalc**

Solve in radians. 1) sin2X = 1/2 2) tan2 (X + pi/2) = 1 3) 5 - 3sec (X - pi/4) = -1
*October 27, 2015 by j*

**Math- Precalc**

could someone please help me solve this problem... e^x - 12e^(-x) - 1
*November 15, 2010 by Alex*

**precalc**

solve in degrees 1) 2sin2 (x/4) = 1 2) 2 cos (3x) + 1 = 0 3) cot2 (x + 18°) = 1 4) (1 + tan(x + 87°)) / 2 = 7
*October 27, 2015 by yani*

**precalc**

Hi. Can someone help me with this? Simplify: (sin^2x)(cos^2x)+(sin^4x) The answer is sin^2x, but I have no idea how to get there! Thanks!
*February 18, 2008 by Andrea*

**Check my precalc**

what is the f inverse of f(x)= ln(x-3) I got y= e^x - 4 Solve 8 times 10^(2x-7)=3 I do not know how to do this. Do i get 8 and 10 with the same base? How? Thanks!
*November 18, 2012 by Rebekah*

**PreCalc**

Someone please help me solve this equation for y. (x^2)(y^2)+xy=1 I need to solve for y so that i can graph it! y^2 + y/x - 1/x^2 = 0 Treat 1/x as b and -1/x^2 as c in the quadratic equation ax^2 + bx + c = 0 There are two solutions y = [-1/x + sqrt(1/x^2 + 4/x^2)]/2 and y...
*February 26, 2007 by Jill*

**Math**

Given g(x) = print_coeff(m,1)x print_const(b), find g(print_coeff(n,1)a) I was told that the answer for this is a. However, I have no idea how to solve it. Please help me understand. I have no idea how to interpret what you have written. It is not standard algebraic notation. ...
*August 10, 2007 by Doralis*

**precalc**

solve the following logarithmic equation: 2lnx= log base e^3 343
*June 30, 2013 by Anonymous*

**PreCalc**

Solve the system by the addition method -10x^2 + 10y^2-320=0 30x^2 + 6y^2 - 336 = 0
*December 11, 2007 by LT*

**Math - PreCalc (12th Grade)**

Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4y-z=8.3 4,3,0 7,0,9 0,4,-1
*March 21, 2014 by Shawna*

**Precalc/Trig**

I have no idea how to solve this one problem: Round to two decimal places. Two observers 25 feet apart, sight to the top of the tree. If the angle of elevation to the top of the tree from the observer closest to the tree is 30 degrees and the angle of elevation from the ...
*December 1, 2014 by Heather*

**Algebra**

Solve 3x +1 < 5 or 3x +1 > 4 By saying "solve," is it asking for me to show it on a line and in interval notation? Here's another: f(x) < 3 and f(x) > 4, where f(x) = 1/2x - 7 I have no idea how to solve this! Please walk me through it! Thank you so much!
*January 26, 2009 by Harper*

**Precalc**

1. Solve log (4x) = log (2) + log (x-1) the fact that this is x-1 and not + is really messing me up because i keep getting a negative number and that isnt possible 2. Solve: absolut value of(x^2 -4x-4) = 8 thanks so much!!! I have been studying and my final is tomorrow. these ...
*December 20, 2012 by Rebekah*

**Precalc**

1. Find the exact value 3sin(invertangent (-1)) I got 0. Given 0<x<orequalto 1, determine the value of inversine (x) + inversetan (squareroot(1-x^2)/x) I really have no idea how to do that. I am trying to draw a diagram but cant figure it out. Thanks!
*February 11, 2013 by Rebekah*

**Math**

Precalc stuff.. square root of z-1= square root of z +6 are you solving for z? square both sides then solve for z. that's my problem, i'm not sure how to solve for z. i need a process. it's not in my book or anything.
*March 7, 2007 by Blondie*

**Precalc**

How to solve for x: 2^(2x) + 2^(x) -12 = 0 Steps too I tried solving this but I ended with ln(12) / 2ln(2) + ln(2) but the real answer is supposed to be ln(3) / ln(2) or 1.585
*January 27, 2011 by Amy*

**Trig/Precalc**

solve 6=e^0.2t Round your answer to the nearest hundredth Someone please help me - I don't understand this problem at all!
*April 19, 2012 by tabby*

**PRECALC QUESTION**

Solve for "x" and "y" given the following matrix equation: (2x, 0.5y, -2, 1) * (3, -2, 0, 1) = (-24, 19, -6, 5) (the matrices are going from left to right, they're all 2x2's.)
*May 25, 2014 by Aly*

**Math**

Solve P=P(base 0)e^kt Solve for t? I have no idea how to solve this
*October 17, 2014 by Eiban*

**precalc/trig**

Solve the Logarithmic equation algebraically. Give an Exact Answer and an approximation for x to four decimal places. 20 log(2x+2)=45
*December 5, 2011 by Alexander*

**Trig/Precalc**

Find the greatest possible value of 5cos(x)+6sin(x). I know that it would be a good idea to look for identities that are in the form of acos(x)+bsin(x), but I can't seem to find any. Other than that I don't really know where to go with this problem. Any help would be much ...
*December 16, 2014 by majorbill*

**Precalc**

Solve for x log[1/3](x^(2) + x) - log[1/3] (x^(2) - x) = -1 Steps too please. so far I tried this and I got 3 = (x+1) / (x-1)
*January 27, 2011 by Amy*

**Precalc with Trig**

What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0
*April 11, 2013 by Natalie*

**Precalc**

Hello, good afternoon. I need help with my precalc hw. we are learning about finding zeros I dont which method I should use for this problem: if i is a zero of x^3+3x^2+ix+(4+i) what do i do? synthetic divison? or long division? when i did long division i got a werid ...
*October 14, 2008 by Samya*

**Algebra**

How would I solve: 1/3(D+3)=5 I know you need to find the recipicile, but I have no idea how to solve this.
*October 17, 2010 by June*

**Maths**

solve the following pair of simultaneous equation: (x/a)+(y/b)=1 (x/b)+(y/a)=1 can someone help please?i have no idea how to solve it =( x/(ab) + y/b^2 = 1/b x/(ab) + y/a^2 = 1/a Subtract one from the other y(1/b^2 - 1/a^2) = 1/b - 1/a y(1/b + 1/a)(1/b - 1/a) = (1/b - 1/a) ...
*July 11, 2007 by Emma*

**Math**

h=at-.25vtsquared ,solve for a Please help me, I have no idea how to solve!
*October 4, 2009 by Petronella*

**Algebra**

To solve the system of equations, which expression could be substituted for x into the first equation? 3x-5y=14 x+4y=10 a)10-4y b)4y+10 c)(1/4)x+(5/2) d)(-1/4)x+(5/2) I have another problem just like this one so if you could explain how to solve this one I can (hopefully) ...
*July 27, 2007 by maddie*

**Precalc**

Solve for x log[1/3](x^(2) + x) - log[1/3] (x^(2) - x) = -1 Steps too please. so far I tried this and I got 3 = (x+1) / (x-1) I asked this question before, but what would x= ?
*January 27, 2011 by Amy*

**PRECALC**

solve for x in the interval zero to two pi. 2 sin 4x = 1 i got 5 pi/24 and pi/ 24 but my teacher said that there should be eight solutions. what would those be and how would i find it"
*October 3, 2012 by greeny*

**PreCalc**

Use the following conditions to create a sketch of the function by hand. a. f(x) is increasing from (-infinity,-4)union(-4, infinity) b. there is a vertical asymptote at x=-4 c. There is a horizontal asymptote at y=2 d. f(0)=-5; f(1)=-3; f(3)=1 I have an idea of what this ...
*September 30, 2009 by MUFFY*

**Algebra 2**

How do I answer this f(x) = x - 3 (x + 4)^(1/2) and am asked how to solve for x when y = -5 I have no idea how to do this and know that I could just solve it by guess and checking but I want to know how to do this algebraically when plugging in the -5 and trying to solve for x...
*May 26, 2009 by Dylan*

**Geometry**

I have no idea how to solve this problem. The question says: Determine whether the points A(4,5), B(-3,3), C(-6,-13) and D(6,-2) are the vertices of a kite. Explain your answer. Can you please help me with the steps to solve it and understanding it.
*February 18, 2008 by Avalon*

**Trig/PreCalc**

Teach me how to express 5sqrt3 - 5i in polar form please. I don't want you to do the work for me. Just show me the steps I need to do the work properly on my own. Otherwise I will not pass this class or the exam when I enter college, and I do not want to retake PreCalc. Its a ...
*April 13, 2012 by tabby*

**Precalc**

solve the equation: log base 10 of x - log base 10 of (7-4x)=2 Please help i have been stuck on this for awhile!
*November 26, 2013 by Alison*

**Precalc**

How to solve this inequality and graph? (2x+5)/(x+1) > (x+1)/(x-1) would I first get rid of x-1 and divide x+1 over to get (2x+5)(x-1)/(x+1)(x+1) > 0 if so, then who would I graph this?
*September 24, 2010 by Amy~*

**calculus**

1) Solve for x in terms of k: log3(x) + log3(x+7) = k; 3 is the base 2) e^(x+5) = e^(x) + 6, solve for x. Please help, I have no idea how to do these and I've tried several times!
*October 2, 2010 by Cornelius*

**precalc: elimating the parameter**

hi, i'm having trouble understanding the concept of eliminating the parameter to obtain an equation in x and y alone. can anyone please solve this problem and explain it? thank you so much. x = 3T-4 y= = 1-2T (0<t<3) those signs are actually less than or equal to.
*July 9, 2008 by joseph*

**precalc pre ap**

If theta is a rotation angle that terminates in quadrant ll and sin of theta is 5/13, find cos of theta and tan of theta. Use the first Pythagorean identity to solve for cos of theta and use quotient identity to solve for tan of theta.
*December 2, 2012 by lore*

**PreCalc**

Find the amount of time required to double a dollar investment at 7.72%, if the interest is compounded continuously. 4.49 years 8.98 years 17.96 years I'm not understanding this, I got 3.9 years when I tried to solve this.
*August 28, 2010 by Anonymous*

**Please help me solve it. Math**

solve for the value of x: 6log (x^2+1)-x=0. please help me because I do not have any idea in this topic.
*April 8, 2013 by Jeconiah *

**Precalc HW (NO IDEA HOW TO SOLVE)**

Low Earth orbiting satellites orbit between 200 and 500 miles above Earth. In order to keep the satellites at a constant distance from Earth, they must maintain a speed of 17,000 miles per hour. Assume Earth's radius is 3960 miles. a. Find the angular velocity needed to ...
*November 19, 2007 by Amie*

**Precalc**

Okay for this question I know I am supposed to use the law of sines. But how can i tell what side is what? In right triangle ABC, a = 120 and c = 140, and ÐC is the right angle. Solve the triangle. Round to the nearest tenth, if necessary.
*August 5, 2011 by anna*

**Civics**

Which of the following describes the Enlightenment idea of natural law? The idea that people consent to government authority and in return the government protects their rights The idea that people are born with rights that no government can take away *** The idea of dividing ...
*January 19, 2015 by jeje*

**check my precalc**

#1. solve x^2-1<0 I got (-1,1) #2 x(x+1) >20 I got (-infinity, -4) U (5,infinity) #3 what is the domain of this function? f(x)= squre root of (x-3x^2) i got [-1/3,0] thanks!!!
*October 1, 2012 by rebekah*

**Chemistry**

What NaCl concentration results when 209 mL of an 0.660 M NaCl solution is mixed with 492 mL of a 0.270 M NaCl solution? __ mol/.209 L = 0.660 M __ mol/.492 L = 0.270 M .. I have no idea how to solve this. I have no idea why I even set up the equation above when it's asking me...
*April 9, 2012 by Katherine*

**precalc**

Solve. Give the answers in degrees so that 0° ≤ θ < 360°. 1) (5 cos θ - 1) / 2 = 1 answers: 53°, 127°, 233° 2) 3 cot (2θ) + 3 = 0 3) tan^2 θ + 2 sec^2 θ = 3 is my answer for #1 correct and i'm not sure how to do #2 and #3.
*October 29, 2015 by owen*

**Algebra III**

3^2x - 6 x 3^x + 9 = 0 Solve for x I have no Idea what to do
*February 18, 2008 by Matt Eaton*

**Math equation**

I have no idea how to solve this. f(x)=3x-4 a) f(10) b) f (-2) c) f (0) d) (b)
*May 17, 2012 by Mary*

**Trig/Precalc**

So I have two questions that have been puzzling me for quite some time and would really appreciate any help with either of them! (a) There are four positive intergers a, b, c, and d such that 4cos(x)cos(2x)cos(4x)=cos(ax)+cos(bx)+cos(cx)+cos(dx) for all values of x. Find a+b+c...
*January 4, 2015 by majorbill*

**Algebra 2 **

solve log2(3x-1)-log2(x-1)=log2(x+1) i have absolutely no idea how to solve this. can anyone help me, please?
*November 9, 2010 by Kelly*

**Social Studies--Check My 1 Answers Please--**

What was "Manifest Destiny"? a. the idea that Americans of European descent were superior to Native Americans b. the idea that woman were destined to attain political equality with men c. the idea that America was destined to expand to cover the entire continent ******* d. the...
*February 26, 2014 by Wendy*

**Precalc+trig**

Solve tan(40/90) for the double angle cos(2theta). I know I use the x^2 + y^2 = r^2 formula and cos(2theta) = cos^2theta - sin^2theta. But I don't understand my answer
*March 4, 2015 by Anna*

**Precalc/Triangles**

Draw and solve any triangles satisfying alpha = 29 degrees a = 7 c = 14 I realize I need to draw a non-right triangle and label the sides but I am completely confused one what to do after I draw the triangle
*November 13, 2012 by Greg*

**Math**

solve for the indicated letter. z=11-y, for y the solution is y= No idea
*May 18, 2009 by scooby9132002*

**algebra I**

Please help I have no idea where to start. Solve for h 5h + 5+ 4h = 36
*February 20, 2011 by MATH HELP PLEASE*

**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*

**chemistry**

Determine the hydroxide ion concentration in a solution that is 0.0004 M HCl. Answer in units of M. I have no idea how to start, I just need to know what I need to solve for and hoe to set it up, I know the formula pOH^-=-log[OH^-] I just don't know where to plug things in and...
*April 16, 2015 by will*

**PreCalc**

Graph y=2csc(x-π) New period that I solve for 0<x-π<2π π<x<3π What is my quarter period? I got that it was 3π/4 but when I add this to pi 4 times o reach 4π instead of 3π. Please help.
*October 11, 2015 by Maddy*

**Math**

I have no idea how to start. I cannot remember how to solve this for anything. 3x/4+6=-12
*September 8, 2009 by Karen*

**algebra**

I have a problem that I have no idea how to solve. The instruction say to solve and check the given equation by rational exponents. The equation is: x to the 5/2 power = 32. Can you show me how to do this step by step?
*December 7, 2011 by ron*

**math**

Q=3x^2+4y^2 if x+y=7 what is minimum value for Q. I have absolutely no idea how to solve this problem.
*February 12, 2012 by summer*

**Please solve it.Logarithm**

Please help me because I do not any idea in Logarithm topic.Solve for the value of X: 6log(x^2+1)=5
*April 2, 2013 by Seth*

**English**

Noun means a person,place thing or idea. List 3 things for each. Person: teacher,doctor,nurse Place: park,school,store Thing: pen,notebook,book Idea: I need help with the idea Please help Thank you! idea: Peace, tranquility, hope, love, hatred. Ideas might be beauty, ...
*December 18, 2006 by Muskan*

**precalc**

solve. give the answers so that 0 ≤ x < 2π. 1) sin x + 4 = 5 csc x answer: π/2 2) 3 csc x + 15 = 0 answer: -.20 are my answers correct?
*October 29, 2015 by owen*

**URGENT MATH help**

(x^2y^6-3)^2 .....PLEASE HELP ME I HAVE NO IDEA HOW TO SOLVE THIS IVE BEEN DOING IT FOR HOURS
*February 18, 2009 by jake*

**math.**

-0.2x<-12 please solve this for me. showing the steps so i can get a better idea of how to do this. This is not the original question.
*October 27, 2010 by heather.*

**8th grade math**

I have no idea how to solve this problem. Can someone help me??? 3x+3y=-6(this is a negative 6) 7x+4y= 1
*December 21, 2010 by lila*

**Algebra**

(x-3)/(x^2-4x+3) Hello My name is Megan Watt, and I have no idea how to solve this. I am so lost.
*February 16, 2011 by Anonymous*

**Algebra**

(x-3)/(x^2-4x+3) Hello My name is Megan Watt, and I have no idea how to solve this. I am so lost.
*February 16, 2011 by Megan Watt*

**Please help me!!!! maths**

Solve for x: log5(x-2)+log8(x-4) = log6(x-1). I do not have any idea on this topic.
*April 3, 2013 by Seth*

**english**

Click on the box to choose whether each sentence restates the key idea expressed in the key sentence. Key Idea: When hot weather arrives and the nation takes to the outdoors, mishaps multiply. Drowning is the fourth most frequent cause of accidental deathin the summer. restate...
*March 1, 2013 by ty*

**English**

I have to write an essay on second hand lion about an important idea in the film and why it is a worthwhile idea in the film. I want to do the importance of the past because of the flash backs do you think this is the right idea and if so what should my 3 paragraphs be about
*July 26, 2011 by Aryaman*

**the big idea of energy**

i have to do an assesment about sound. i have to include the big idea of energy. i have no clue what it is! HHEELLPP MMEE!! What do you mean when you say "the big idea of energy"? I know that sound is created by vibrations, but I'm not sure thats exactly what you are looking ...
*December 5, 2006 by Anon*

**Science (big idea of energy)**

What is the big idea of energy????? It says : for level 6: "Explained the reaction using the big idea of energy" what does it mean by the big idea of energy????
*October 1, 2007 by person*

**pre algebra**

solve and check the following equation:I have no idea as to how to answer this. 69g-60=5g-2-g
*June 9, 2009 by Kim*

**algebra**

can someone help me understand how to solve this... i have no idea what to do! why are the letters in the problem? factoring strategy 9x^2 + 4y^2
*July 26, 2010 by vera*