Wednesday

April 23, 2014

April 23, 2014

Number of results: 41,305

**Pre-Calculus-Trig**

2044
*Sunday, January 30, 2011 at 8:00pm by Anonymous*

**Pre-Calculus/Trivia**

If x = sin(theta), these equations are identities, expressing other trig functions in terms of sin hey arise from the identity sin^2(theta) + cos^2(theta) = 1 As for real life and calculus, get familiar with the trig functions, and by the time you have mastered the techniques...
*Monday, February 20, 2012 at 9:22pm by Steve*

**Pre- Calculus**

Evaluate the trig function tan33degress
*Thursday, February 23, 2012 at 9:24pm by Steve*

**Pre-Calculus-Trig**

A. 3617.6 B. 4018.7 C. 3642.12
*Sunday, January 30, 2011 at 8:00pm by Ayman*

**Pre-Calculus/Trig Check please and help**

correc, typo. -3x^2
*Monday, September 5, 2011 at 8:52am by bobpursley*

**pre calculus 2**

use the fundamental trig. Identities to simplify tan^4x+2tan^2x+1
*Sunday, July 24, 2011 at 9:18pm by denise *

**Pre-calculus**

Looks like calculus not pre-calculus to me by the way. I do not see how to do it without taking the derivative.
*Tuesday, November 27, 2012 at 6:01pm by Damon*

**Pre-calculus**

find the trig functions of angle x if the terminal side of x passes through the point (-12, 5).
*Sunday, August 7, 2011 at 10:35pm by Lala Kennedy*

**Math (Trig/pre-calculus)**

nevermind, I figured it out, it is approximately 4.1 x10^13 km from the star
*Thursday, August 23, 2012 at 9:52pm by Anonymous*

**Pre-Calculus/Calculus**

I am too embarassed to ask this Calculus (really pre-calculus) question in tutoring, because I know I should know. Is the inverse of f(x)=3x-1 actually f(x)=1/3x+1? How do I find it? What if it asks the same equation replaced with f to the -1 power (x)? I think I know how the ...
*Tuesday, July 1, 2008 at 10:38pm by Molly*

**Pre Calculus/Trig**

find the area of a circle inscribed in triangle ABC where a=9, b=13, and the measure of angle C=38 degrees
*Thursday, October 11, 2007 at 9:04pm by Nick*

**Pre Calculus/Trig**

I've tried that multiple times, but I was told the answer should be more than one. I get something around .07
*Thursday, October 11, 2007 at 9:04pm by Nick*

**Pre-Calculus/Trig Check please and help**

First find (x-3i)(x+3i)=x^2+9 and then (x-3)(x^2+9)=x^3-3x^2+9x-27
*Monday, September 5, 2011 at 8:52am by Mgraph*

**pre calculus**

You need to write out the question. I have no idea what "pre calculus" this could be, maybe zeroes, however, that is standard fare for an algebra course.
*Tuesday, December 10, 2013 at 6:26pm by bobpursley*

**pre calculus**

You need to write out the question. I have no idea what "pre calculus" this could be, maybe zeroes, however, that is standard fare for an algebra course.
*Tuesday, December 10, 2013 at 6:26pm by bobpursley*

**Pre Calculus**

Pre Calculus why is sin(-20)/cos 380 equal to tan (-200)
*Sunday, November 15, 2009 at 10:07pm by Pre Calculus*

**Pre-Calculus**

yeah part exams library go there Pre-Calculus exam
*Thursday, October 29, 2009 at 7:46pm by stephanie*

**PRE-CALCULUS**

THIS IS FOR ALGEBRA/PRE-CALCULUS MATH. I POSTED IT JUST AS THE TEACHER WROTE IT.
*Tuesday, September 13, 2011 at 10:41pm by aLVIN*

**Pre-Calculus**

I am in Honors Pre-Calculus and am having a hard time understanding my teacher. I feel so stupid. Does anyone have any suggestions on a website that might give me some insight into what I am doing wrong? Thanks!
*Tuesday, October 7, 2008 at 4:23pm by Jill*

**pre-calculus**

In google type : r=3cos2theta When you see list of results click on : Advanced Math: precal, trig identities, conversion You will see answer.
*Sunday, March 18, 2012 at 6:11pm by Bosnian*

**Pre-Calculus**

one period is from x = 0 to x = 2 pi/3 so that the argument of the trig function changes by 2 pi so the answer is 2 pi/3
*Saturday, November 24, 2012 at 6:07pm by Damon*

**Pre Calculus/Trig**

You can get c with the law of cosines. Then, draw the figure. You have a multitude of similar triangles. The idea is to use them to find the measure of radius, the distance on many of those triangles.
*Thursday, October 11, 2007 at 9:04pm by bobpursley*

**Pre Calculus**

you're welcome. I always enjoyed doing trig identities. They provide endless variations. The hard ones for me, though, are the ones involving tan and sec combinations. They can get quite involved.
*Sunday, November 4, 2012 at 1:17pm by Steve*

**pre calculus**

Pre-Calculus? I wonder what the question is. In a basic algebra course, you would be looking for zeroes, and probably get those by factoring. 2x^2+11x-21=0 (2x-3)(x+7)=0 x= 1.5, or x=-7
*Tuesday, December 10, 2013 at 12:39pm by bobpursley*

**Pre-Calculus-Trig**

A road rises 140 feet per horizontal mile. What angle does the road make with the horizontal?
*Sunday, January 30, 2011 at 7:40pm by Chloe Mack*

**Pre-Calculus**

Pre-Calculus? That is a nasty equation. We might use Newton's Method, but that would be Calculus. I tried some "trial and erro" and got x = appr .371 using 2 decimals 4 sin .37 = 1.44646 e^.37 = 1.4477 I am curious what method was suggested that you should use.
*Friday, March 29, 2013 at 10:30pm by Reiny*

**pre-calculus**

pre-calculus and i didn't understand where the d and cos came from
*Thursday, September 29, 2011 at 10:44pm by tatiana*

**math**

Are you doing pre-calculus or calculus? In calculus, the maximum is obtained by setting f'(t)=derivative with respect to t = 0 and solving for t. In pre-calculus, you can transform the expression by completing the squares. Ax² + Bx + C =A(x²+ (B/A)x + C/A) =A((x + (B...
*Tuesday, September 8, 2009 at 10:22pm by MathMate*

**pre calculus**

I assume you have had trig. Draw the figure. if it has a 70 degree acute angle, the other angle is 110. Use the law of cosines: shortdiag^2=6^2+7^2-2*6*7Cos70 longdiag^2=6^2+7^2-2*6*7Cos110
*Wednesday, December 1, 2010 at 7:37pm by bobpursley*

**Pre-Calculus-Trig**

A surveyor stakes out points A and B on sides of a building. Point C on the side of the building is 300 feet from A and 440 feet from B. Angle ACB measures 38 degrees. What is the distance from A to B?
*Sunday, January 30, 2011 at 7:57pm by Chloe Mack*

**trig**

any calculus text will list the trig functions and their derivatives.
*Thursday, January 19, 2012 at 8:45am by Steve*

**Pre-Calculus-Trig**

A pilot in a plane at an altitude of 22,000 feet observes that the angle of depression to a nearby airport is 26 degrees. How many miles is the airport from a point on the ground directly below the plane?
*Sunday, January 30, 2011 at 6:19pm by Chloe Mack*

**trig**

Just noticed this was for trig, not calculus. Algebraically, note that a(y) is a parabola, whose vertex occurs where y=60/4 = 15.
*Thursday, August 29, 2013 at 9:44pm by Steve*

**Pre-Calculus-Trig**

A 40 foot high flagpole sits on the side of a hill. The hillside makes a 17 degree angle with horizontal. How long is a wire that runs from the top of the pole to a point 72 feet downhill from the base of the pole?
*Sunday, January 30, 2011 at 8:06pm by Chloe Mack*

**Math: Pre-calculus**

P=2(W+L) A=WL, so L = 180/W so, P = 2(W+180/W) This is pre-cal, so you don't have calculus at your disposal. But, you do know that a square has maximum area for a given perimeter. So, W = L = √180 = 6√5
*Sunday, October 6, 2013 at 5:35pm by Steve*

**pre calc**

A pre-calculus answer is -0.64 + kπ radians, where k∈ℤ.
*Monday, January 25, 2010 at 8:11pm by MathMate*

**Pre-Calculus-Trig**

A lighthouse keeper 100 feet above the water sees a boat sailing in a straight line directly toward her. As watches, the angle of depression to the boat changes from 25 degrees to 40. How far has the boat traveled during this time?
*Sunday, January 30, 2011 at 7:44pm by Chloe Mack*

**Calculus grade 12 exam review PLEASE HELP ASAP !!**

THANK U! to be honest i really hate calculus and i didnt really pay attention in the course. im going into kin (of arts) so its a pre-req but i wont be taking any math or calc courses in university, i dont know why its a pre req then. but thanks u so much
*Thursday, June 21, 2012 at 3:52pm by Sarah Berkley Adamson*

**Pre-Calculus-Trig**

Using the Law of Sines, L / sin64 = 34 / sin(90-12), L / sin64 = 34 / sin78, Multiply both sides by sin64: L = 34sin64 / sin78 = 31.2ft = Length of pole.
*Sunday, January 30, 2011 at 7:52pm by Henry*

**pre-calc/ trig**

yes it is.
*Tuesday, October 15, 2013 at 10:07am by Reiny*

**Pre-Calculus-Trig**

Two trains depart simultaneously from the same station. The angle between the two tracks on which they leave is 120 degrees. One train travels at an average speed of 45 mph and the other at 70 mph. How far apart are the trains after three hours?
*Sunday, January 30, 2011 at 7:47pm by Chloe Mack*

**Pre-Calculus-Trig**

A pole tilts 12 degrees from the vertical, away from the sun, casts a 34 foot long shadow on level ground. The angle of elevation from the end of the shadow to the top of the pole is 64 degrees. How long is the pole?
*Sunday, January 30, 2011 at 7:52pm by Chloe Mack*

**Pre-Calculus-Trig**

A straight road slopes at an angle of 10° with the horizontal.When the angle of elevation of the sun is 62.5°,a telephone pole at the side of the road casts a 15-foot shadow downhill,parallel to the road.How high is the telephone pole?
*Sunday, January 30, 2011 at 8:03pm by on*

**Trig/Pre-Cal**

1 - - x > 0 x
*Sunday, September 7, 2008 at 11:18pm by Brooke*

**pre-calc/ trig**

Sinx=0
*Tuesday, October 15, 2013 at 10:07am by Amy*

**Trig/Pre-Calc**

Need help with current Trig problem for tomorrow: Solve the logarithmic equation algebraically. Approximate the result to three decimal places. 6log3(0.5x)=11 I know to start off the equation you divide by 6. I know the answer is 14.988. I just am puzzled on how to receive the...
*Monday, May 16, 2011 at 6:18pm by Eric*

**Pre-Calculus/Trig Check please and help**

Do the last two first: (x-3i)(x+3i) You can do FOIL (the anwer to x*(-3i) is -3xi), however, notice x+9 is the answer. (x^2+9) is the difference of two squares, x and 3i, so (x^2+9)=(x+3i)*(x-3i) so you now have (x-3)(x^2+9) = x^3+9x -3x^3-27 Using the FOIL method.
*Monday, September 5, 2011 at 8:52am by bobpursley*

**Pre-Calculus-Trig**

Chloe, the tutors are not here to do YOUR homework. You have to try to solve these yourself. Post your work for each problem and someone will help if you are stuck. It helps if you draw a picture. The problems I've done for you today all involve right triangles. So read each ...
*Sunday, January 30, 2011 at 8:00pm by helper*

**Trig/Pre-Calc**

log4 ( ) = 1/2 or ( )=4^1/2 or ( )=2 2x-2=x x=2
*Monday, May 16, 2011 at 7:01pm by bobpursley*

**Pre-cal/Trig**

y=2sec(1/3x)
*Monday, February 21, 2011 at 9:44pm by Delano*

**math-calculus**

btw this is actually pre-calculus publisher is absolute value publications
*Tuesday, January 17, 2012 at 11:28pm by Shreya*

**Pre-Cal (verifying trig identities)**

what is rad?
*Thursday, February 12, 2009 at 10:04pm by bobpursley*

**Pre-Cal (verifying trig identities)**

radical
*Thursday, February 12, 2009 at 10:04pm by Crystal*

**Pre-Cal (verifying trig identities)**

Thanks, Reiny.
*Thursday, February 12, 2009 at 10:04pm by bobpursley*

**MATH: Pre-Cal/Trig**

18 by 24
*Saturday, January 29, 2011 at 5:20pm by Anonymous*

**Trigonometry**

Trig? this is pre-algebra What is 7x-52?
*Saturday, January 19, 2013 at 6:53pm by bobpursley*

**pre calculus**

Multiply 1.2 rev/s by 2 pi radians/revolution. The radius does not matter. Learn to spell calculus
*Thursday, December 3, 2009 at 11:50am by drwls*

**Pre-Calculus-Trig**

A boat travels for 8 kilometers in a straight line from the dock. It is then sighted from a lighthouse which is 6.5 kilometers from the dock. The angle determined by the dock, the lighthouse(vertex), and the boat is 25 degrees. How far is the boat from the lighthouse?
*Sunday, January 30, 2011 at 7:50pm by Chloe Mack*

**Pre-Calculus-Trig**

Use the Law of Cosines to solve triangle ABC: cosC = (a^2 + b^2 - c^2) / 2ab. cos38=((440)^2+(300)^2-c^2)/2*440*300, 0.7880 = (283600 - c^2) / 264000, Cross multiply: -c^2 + 283600 = 208032, -c^2 = 208032 - 283600, -c^2 = - 75568, c^2 = 75568, c = 275ft. = Distance from A to B.
*Sunday, January 30, 2011 at 7:57pm by Henry*

**Pre-Calculus-Trig**

C(3rd angle) = 180 - 63 - 54 = 63deg. If 2 angles(63deg) of a triangle are = the sides opp. these angles are =. Therefore, Alice's dist. from pole = 240m. Using the Law of Sines, d / sin54 = 240 / sin63, d = 240sin54 / sin63 = 218m. = Joe's dist. from pole.
*Sunday, January 30, 2011 at 7:56pm by Henry*

**Pre Calc , Math**

Find the 6 Trig ratios of -7Pie/3
*Sunday, January 2, 2011 at 9:50pm by Joe Daddy*

**pre-ap pre calculus **

To solve an equation by finding x-intercepts, Cynthia graphed the function y=x^3-5x+|2x-3| Give several possibilities for the original equation. How do I do it and what's the answer? Thanks
*Tuesday, September 8, 2009 at 2:14pm by Anonymous*

**Pre-calculus**

The period is 4 pi since than is how much teta must increases to increase the argument,(theta/2- pi/4), by 2 pi. The phase shift (to the right on a graph) is pi/4, not -pi/4. That is how much the trig function shifts to the right. Think about it. You got the vertical shift ...
*Wednesday, January 21, 2009 at 1:26pm by drwls*

**Pre-Calculus**

I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)
*Saturday, September 17, 2011 at 2:40pm by Cristina*

**Pre-Calculus**

I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)
*Saturday, September 17, 2011 at 3:48pm by Cristina*

**pre-calculus**

@Adam: if these kinds of problems are hard for you to understand (i know they are for me)try algebra-dot-com. Type your question in the google custom search box. They have some problems in the archives. If they don't have the ones you're looking for, go back to the homepage, ...
*Sunday, April 22, 2012 at 7:02pm by Anonymous*

**Pre-calculus**

So, since you know Cos x= 0.8, plug in to the calculator Cos inv of 0.8. Do the same for Cos Y= 12/13. X=36.9 degrees Y=22.6 degrees I think that where you are in precalculus, you have to know these trig identities. You MUST memorize them as they are the basis of good ...
*Friday, February 17, 2012 at 12:58am by yoyoma*

**Pre-calc, Algebra, Trig**

Sorry. I posted it again. Hope this helps
*Tuesday, January 20, 2009 at 9:38pm by Josiah*

**Pre-Calculus-Trig**

A straight road slopes at an angle of 10 degrees with the horizontal. When the angle of elevation of the sun (from horizontal) is 62.5 degrees, a telephone pole at the side of the road casts a 15 foot shadow downhill, parallel to the road. How high is the telephone pole?
*Sunday, January 30, 2011 at 8:03pm by Chloe Mack*

**Pre-Calculus**

Can you show me how to find the rectangular equation: r=2cos(theta) + 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
*Monday, October 3, 2011 at 7:49pm by Leah*

**pre calc**

This is a long, long way from pre-calculus. 2,4 is in quadrant I when on any axis, it is not in a quadrant. In the case of 0,3 it is on the border between quadrants I,and II.
*Thursday, September 10, 2009 at 5:40pm by bobpursley*

**Pre Calc.**

correct on all counts, good job For questions on finding "exact" values for certain trig ratios, a quick way to check your result is to simply evaluate your answer with a calculator, then compare it to the calculator result for the initial trig ratio e.g. for yours I found (-...
*Wednesday, April 22, 2009 at 10:54am by Reiny*

**Pre-calc**

Pre calculus? This is stock Algebra II. put the equations in the form of ax^2+bx+c=0 then factor. for instance, c is already in that form. 2x^2+x-6=0 (2x-3)(x+2)=0 x= 3/2 x=-2 do the others the same method.
*Monday, January 25, 2010 at 5:18pm by bobpursley*

**Pre-Cal: Trig**

The point (7,2) determines a poistion angle "t". Find the exact value of sin(t).
*Sunday, January 23, 2011 at 11:53pm by Alex*

**Pre-Cal: Trig**

The point (7,2) determines a position angle "t". Find the exact value of sin(t).
*Sunday, January 23, 2011 at 11:54pm by Alex*

**pre cal\trig**

Find the following cot(Arccsc 25/24) show your work
*Thursday, May 26, 2011 at 5:17pm by Cheryl*

**Pre-Calc**

cot 19.8 = 2.7776 You need to use a trig table or calculator to answer that
*Saturday, July 30, 2011 at 11:41pm by drwls*

**Pre Calc Trig**

Verify the following: tan( a + p/2) = -cot a a= alpha and p= pie since I do not have that button.
*Tuesday, March 29, 2011 at 1:16pm by Brittany*

**pre-cal/trig**

if you get to cosx+sinx=1/square root of 2, well we are doing identities in my pre-cal class and cosx+sinx always equals 1, so it would be 1/square root of 2.
*Tuesday, March 4, 2008 at 7:44pm by emily*

**Math-Pre Cal & Trig**

Christa, the data on the time line should be shifted one space to the right.
*Sunday, July 25, 2010 at 9:38pm by Henry*

**calculus**

do you do u substitution for each or automatically trig substitution. Because when you do trig sub you get 0 but when you do u sub then you get pi/4
*Thursday, March 4, 2010 at 2:03am by Dana*

**Pre-Calculus-Trig**

Two surveyors, Joe and Alice, are 240 meters apart on a riverbank. Each sights a flagpole on the opposite bank. The angle from the pole to Joe (vertex) to Alice is 63 degrees. The angle from the pole to Alice(vertex)to Joe is 54 degrees. How far are Joe and Alice from the pole?
*Sunday, January 30, 2011 at 7:56pm by Chloe Mack*

**Pre-Calculus**

well, shoot. Then just subtract 8 from both sides to get 3x^2 = -12 x^2 = -4 there is no real solution, since x^2 is never negative for real x. If you allow complex solutions, then x = 2i or -2i. I believe this is from Algebra I, and should not be posing a difficulty for ...
*Wednesday, September 11, 2013 at 4:58pm by Steve*

**Pre Calculus 12**

Im going over my pre calculus 12 exam, and I need help with one question from the chapter Transformations of graphs and stuff. Combining Transformations 2y = f(5x-10)+8 The original points are (4,6) and the new points I got by translating it and stuff are : (14/5,20) But in ...
*Tuesday, January 22, 2013 at 8:18pm by Shreya*

**calculus**

that has to do with trig substitution i believe..
*Monday, March 12, 2012 at 9:18pm by will*

**Algebra 2**

In Kentucky, where i am from, we do algebra and algebra two before pre-cal and calculus. I didnt realize that the problem could be solved in multiple ways and i apologise. But the solution should be done without calculus.
*Thursday, February 24, 2011 at 10:33pm by Anon*

**Math-Pre Cal & Trig**

A B d(cm)-10 -8 -6 -4 -2 0 2 4 6 8 10 t(se) 1 .8 .6 .4 .2 0 .2 .4 .6.8 1
*Sunday, July 25, 2010 at 9:38pm by Henry*

**pre calc**

A math teacher uses four algebra books, two geometry books, and three pre-calculus books for reference. In how many ways can the teacher arrange the books on the shelf if books coiver the same subject matter are kept together?
*Sunday, September 25, 2011 at 5:39pm by Katie*

**pre calculus**

P=2W+2L L=1.5W 480=2W+2(1.5W) solve for W, then go back and solve for L This is Pre-Cal?
*Wednesday, January 7, 2009 at 8:27pm by bobpursley*

**Pre-Calculus**

welcome
*Tuesday, January 22, 2013 at 10:29pm by Reiny*

**Pre-Calculus**

yes
*Sunday, April 6, 2008 at 10:52pm by Reiny*

**pre-calculus**

3(4^x)-2^(x+2) = -1
*Wednesday, May 14, 2008 at 9:55pm by Mike*

**Pre Calculus**

thank u
*Monday, October 6, 2008 at 9:07pm by Crystal*

**Pre Calculus**

Thank you
*Saturday, October 18, 2008 at 11:51pm by Lia*

**pre calculus**

YES!!!
*Wednesday, January 7, 2009 at 8:27pm by nichole*

**Pre-calculus**

Thanks
*Tuesday, January 20, 2009 at 11:12am by Liz*

**Pre-calculus**

Thanks
*Wednesday, January 28, 2009 at 11:13am by Mary*

**Pre Calculus**

Thanks...
*Sunday, July 26, 2009 at 7:08pm by Shellie*

**Pre-Calculus**

Thanks!
*Sunday, September 6, 2009 at 8:51pm by Ashley*

**Pre-Calculus**

x+5=4
*Saturday, May 3, 2008 at 11:05pm by destiny*

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