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October 20, 2014

Search: math (final trig problem)

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math (final trig problem)
Solve for x on the interval [0,π/2): cos^3(2x) + 3cos^2(2x) + 3cos(2x) = 4 I havent done trig for a while so what exactly does that mean in solving for x on that interval and how would i go about doing that? Where are you getting these tough trig questions?? how about ...
April 30, 2007 by jacob

trig
I'm trying to see if the teacher didn't give us the right problem or if I'm just not getting it. The problem is "re-write the expression without a fraction: 4/(1-sin x)". I can do it if the problem is sin squared x but I don't know how to solve the problem given. Pls help. thx
September 19, 2009 by Priscilla

math trig
ln(2x-5)= 4 how do i this problem? thanks!
May 21, 2012 by greeny

Trigonometry
Use the trig Identities to find the other 5 trig functions. Problem 7.)Tan(90-x)=-3/8 8.)Csc x=-13/5 9.)Cot x=square root of 3 10.)Sin(90-x)=-.4563 11.)Sec(-x)=4 12.)Cos x=-.2351 I need HELP!
January 5, 2010 by Jennifer

Trig
Find an equation for the hyperbola described. Foci at (-4,0) and (4,0); asymptote the line y= -x. Please explain the steps of this problem. My book does not get an example of this type of problem and I'm not having any luck working this problem.
July 19, 2011 by EVJ

Thermodynamics
An insulated rigid tank contains 1.5 kg of helium at 30∘C and 500 kPa. A paddle wheel with a power rating of 0.1 kW is operated within the tank for 30 minutes. Cvof helium = 3.12 KJ/Kg.K Problem 7A. Calculate the net work done by helium, in kJ. Enter the number with ...
October 17, 2014 by Phy

Trig
HELP!!!! I dont know how to do the trig identity with this problem csc^4 x-cot^4x= Csx^2 x + cot^2x
March 8, 2012 by Quetzally

Physics
I'm stuck on this problem. "You mix 100 ml 60 degree C water with 100ml 20 degree C water. Find the final temperature" Changing 100 ml to .1kg, I set .1*4186*(60-final temp.) + .1*4186*(final temp-20)=0 but my t's cancel out. I know it would work if I set my first half of ...
April 28, 2009 by Brigid

Proof math problem help? Please help if you can!
Let AB be the diameter of a circle, and let point P be a point on AB. Let CD be a chord parallel to AB. Prove that PA^2 + PB^2 = PC^2 + PD^2 It can be solved using geometry methods (no trig). Anyway, I figured out that PA^2 +PB^2 = 2OP^2 + 2OB^2. However, I cannot find right ...
January 15, 2013 by Knights

Algebra Question
I did a problem and used the substitution method and it took me forever to solve by hand. Is there a shorter way to show how this problem was done. The problem was x+y+z=7,x-y+2z=7,2x+y+3z=15 The final answer came out to be x=4 z=2 y=1
December 18, 2009 by mike

trig
I am very confused about the concepts of.. sin = sin(180 - ) sin (180 + )= -sin tan (180 - ) = -tan and how the final answer was found in this problem... Find cos 510: cos510=cos(540-30) =-cos30 =-s.r3/2 i dont understand how we went from -cos 30 to -s.r3/2 ?
April 30, 2009 by killie

math
How do I write this problem? to recieve a grade B- in a math course, you must have a mean of 83 on five tests (4 tests + one final) all 100 pts maximum each. Your scores thus far are 85,79,82,and 81. How many points must you have on the final, to earn the B-? write down your ...
September 4, 2009 by Anonymous

Trig
How do i set this trig problem up? PLEASE help me. Find tan (s + t) given that sin s = 1/4, with s in quadrant 2, and sin t = -1/2, with t in quadrant 4.
May 3, 2010 by Dave

Algebra 2
The problem is 3x^2 - 26 + 35 (We have to factor it!) So, I did the problem, but I'm not sure how to write the final answer. This is what my problem looks like so far: 3x^2 - 26 + 35 (3x^2-21x)-(5x+35) 3x(x-7)-5(x+7) and this is where I have the problem. I know I need to put (...
November 16, 2011 by Hal

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...
May 16, 2011 by Eric

math
this is the third and final problem I can not figure out. Help please Divide (x^4 - 8x^2 + 15) / (x^2 -3) =
July 17, 2010 by Christy

Math
I have a question.. I have a 90.7% in math right now and I need to bring it up to a 93%. The only thing left is the final exam, which is worth 10% of your grade. Does anyone know a formula or a method that will allow me to calculate what I need on the final exam to bump me up ...
June 18, 2007 by John

math
How to solve for delta using trig functions? i.e. cosine sine tangent secant Thank you I'm not sure what delta you're referring to. Could you please elaborate some for us. What is it you're trying to do with the trig funtions? the problem is.. limit sec theda - 1/ theda sec ...
September 6, 2006 by Kali

working with data
josephs final averages in science class are shown in the table below. homework % toward final grade-20% average-93 quizzes % toward final grade-20% average-92 tests % toward final grade-40% average-85 final exam % toward final grade-20% average-? what is the minimum score ...
February 24, 2008 by mike

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each polar ...
May 16, 2013 by Kate

chemistry
hi, i was wondering if anyone could help me with this problem? i am having some difficulty with it. thanks. a).how many grams of Al(NO3)3 are needed to prepare 300mL of a 1.071 M solution? b).if you further dilute this 300mL to a new final volume of 5.0L, calculate the final ...
March 4, 2008 by tina

math
could someone please refresh my memory of the basic trig functions? ex) cos^2 + sin^2 = 1? That is a trig identity. http://www.sosmath.com/trig/Trig5/trig5/trig5.html
April 12, 2007 by raychael

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
May 16, 2013 by Kate

Chemistry
I am having a horrible time with Enthalpy change. I understand how to find specific heat I believe, but the heat capacity of the vessel is given as 10 J/K. My problem is that my professor did not show us how to work this type of problem, and I desperately need help with it. ...
July 2, 2010 by Casey

Math
Going into the final exam which will count as two-thirds of the final grade, Mike has test scores of 86,80,84,and 90. What score does he need on the final to earn an average score of 80? Is this right: (86+80+84+90)/4 = 80 2/3x(85)= 80 or ((86+80+84+90+(2/3x))/5 = 80
September 17, 2010 by Amy~

College Algebra
I need help factoring a problem and cant seem to get it right. The one I'm stumped on is 2x^2+7x+2. I have to compute as indicated and write final in the lowest terms. The whole problem is x^2-7x-18/x^2-6x-27*2x^2+7x+2/2x^2+5x+2
January 13, 2013 by Kristen

Math
1. What are the steps to solve this problem? 0.000027 0.000009 Requirements: Explain how to use scientific notation to solve the problem. Describe how to divide numbers written in scientific notation. Give you final answer in simplest form. (5 points) Steve please help
November 14, 2013 by anonymous

Test Prep for College Final
I have been taking a distance learning course the past year. It is a correspondence course through a regionally accredited college. I need this course for my degree. I am going to take my final in two days at the college that is acting as my proctor. I understand and know the ...
November 23, 2008 by G

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

Problem Solving
Lindsey has 75% as her final grade, but after she writes her exam she gets 85%. If her exam is worth 7.5%, what is her final grade.
June 14, 2008 by Carrie

Math
1. What are the steps to solve this problem? 0.000027 0.000009 Explain how to use scientific notation to solve the problem. Describe how to divide numbers written in scientific notation. Give you final answer in simplest form. (5 points) I really need help with this ...
November 13, 2013 by anonymous

Trig
How do you do this problem? 1+i(square root of 3)
November 12, 2009 by Kevin

Trig
How do I solve this problem? tan (30 + x)
May 2, 2010 by Abby

Math- gr.12 Trig.
Hi, could someone explain to me how to use a counterexample in trig to prove whether something is either an identity or equation? For ex. how would you do that with this question? sec^2x-tan^2x= cos x
January 11, 2010 by May

Math (trigonometry)
How do you solve this trig identity problem without factoring? I just used @ to represent theta: sin^4@ + 2sin^2@cos^2@ + cos^4@ = 1
November 27, 2012 by Sammy

Physics
25) A 75-g ice cube at 0 C is placed in 825g of water at 25 C. a) What is the final temperature of the mixture? b) If the final temperature is 0 C, then how much ice remains? c) change the ice's mass to 300g, and repeat the problem
November 30, 2010 by Y0gi

trig(really struggling with this problem)
expand (x + y)^5
November 10, 2008 by jerson

Trig
How do you find the H-Shift. My problem is y=5 sin(3x-pi/2).
January 14, 2010 by Jennifer

math
An instructor counts homework as 1/3 of the student's grade and the final exam to be 2/3 of the student's final grade. Going into the final exam a student has a homework grade of 48%. What range of scores on the final exam would put the student's final average between 70% and...
September 30, 2007 by Jessica

Physics
25) A 75-g ice cube at 0 C is placed in 825g of water at 25 C. a) What is the final temperature of the mixture? b) If the final temperature is 0 C, then how much ice remains? c) change the ice's mass to 300g, and repeat the problem I don't know how to work this at all!!! ...
November 30, 2010 by Y0gi

Trig problem
What is a coterminal angle with 170 degrees?
August 14, 2009 by Casey

trig
how do i solve this completing the square problem: 3x^2+12x+10=0
April 26, 2011 by Anonymous

Physics please check
Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
April 15, 2007 by Mary

trig
If a triangle has an area of 50 square units and has angles that measure 15, 65, and 100 degress, find the length of the shortest side to the nearest tenth. Do not round till the final answer.
April 3, 2011 by A

trig
If a triangle has an area of 50 square units and has angles that measure 15, 65, and 100 degress, find the length of the shortest side to the nearest tenth. Do not round till the final answer.
April 3, 2011 by A

Algebra
I have just one math problem that I need a little help with. Please give me the answer, and walk me through it, too, to help me understand it. Thanks! The price of a ring is decreased by 40% and the resulting price is increased by 50%. The final price is $360. What was the ...
November 6, 2008 by Celina

Physics please check repost
Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
April 15, 2007 by Mary

trig
Find arcsin [cos (Pi/2)] The answer is 0. How do you solve this problem? Thanks.
June 8, 2009 by Chris

algebra 2 trig
i need to find out how to solve this problem: 9x+2 7 ---------- + --- 3x^2-2x-8 3x^2+x-4
September 27, 2009 by eden

algebra-trig help asap
x=sec^-1 2 I really need help with this problem. Thanks
April 18, 2012 by missy

algebra
Solve the inequality. |2x+3|< 26 So there are two answers to this problem? Do you switch the inequality sign for the second answer? This is the absolute value of some quantity I suppose. We have |2x+3|< 26 Thus we want numbers such that -26 < 2x+3 < 26 You can ...
August 30, 2006 by anonymous

TRIGONOMETRY
I don't understand how to convert -3-4i to polar coordinates. I need to know how so I am ready for my trig final next year. Can someone please show me step by step how to solve this? Thanks
May 17, 2013 by Kate

math
i need help with this problem:2x-y=-4 -x-y=5 when you answer this question can you plz include the steps you did to get the final answer?
November 1, 2007 by asha

Math Problem
Find the equation for the graph in final state. y=e^x is 4 to right and 2 up y=e^x y=2+e^x-4 (answer) is this right?
April 9, 2008 by Kimberly

Trig
Rewrite cos(tan^-1(v)) as an algebraic expression in v. Can someone help me with this problem? Thanks
May 15, 2011 by Jennifer

English
1. He can not solve the math problem. 2. He cannot solve the math problem. 3. He can't solve the math problem. 4. He could not solve the math problem. 5. He couldnot solve the math problem. 6. He couldn't solve the math problem. (Are they all grammatical? What about #5? Is it ...
July 16, 2013 by rfvv

trig
A passenger airplane flying at an altitude of 1.8 km starts its final airport approach by descending at an angle of depression of 6. How far along the ground is the airplane from its landing point
March 29, 2011 by kristy

Algebra
Before the final exam, a student has test scores of 72, 80, 65, 78, and 60. If the final exam counts as one-third of the final grade, what score must the student recieve in order to have a final average of 76 percent? Thanks!!
September 14, 2013 by Serena

Algebra II
Working on my online math homework, I encountered this problem: Solve: (3x^-1 y^-2)^-2 (x^2 y^5)^-1 [[Spaces denote the end of the exponent.]] Because of the law of exponents that deals with negative exponents, I did the reciprocal and distributed the exponent, getting (1/3x^2...
January 25, 2012 by Kenneth

trig
How would I solve this problem for t? 720 = 11.895+2.545sin [2pi/366(t-80.5)]
November 25, 2012 by anna

Math/Trig
The average temperature, in F, for Atlanta, GA is modeled by the sinusoidal function y = 18.25 sin(pi/6 t - 2.09) + 61.15 where t is the time in months and January is t = 1. What is the average temperature for the month of February? How do I do this problem ? Please Help
January 14, 2011 by CJ

Math
Can someone check my work? the problem is: x=2+3/y and I have to solve for y I get rid of the denominator y and multiply it with X...so it looks like xy=5 then just divide by x on both sides for a final answer of y=5/x
September 1, 2013 by George

Chemistry
A 35g sample of Fe is dropped into 80g of water at 20 degrees Celsius. What is the final (equilibrium) temperature of the iron/water? This isn't really a chemistry problem. There will be no chemical reaction. It is a heat capacity (physics) problem. Use the specfic heats of ...
March 19, 2007 by Michelle

Physics
i know this is alot to ask for but these 10 i can nott get out of the 30 A man pulls a 10-kg box across a smooth floor with a force of 71 newtons at an angle of 23 degrees and for a distance of 97 meters. How much work, to the nearest joule, does he do...
December 10, 2008 by Michelle

precalc
Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1, where your theta is in degrees. B. The Trig form of z1*z2, where z2=5[cos(60degrees)+isin(60degrees)] C. The Trig Form of (z1)^4
December 5, 2011 by Joshua

Problem Solving
Carl is trying to find a combination. It's written in a riddle. Find 2/3 of the final number, add 16, and this number will equal two times the mystery number. What was the final number of the combination?
February 21, 2008 by Paul

trig
If tan(x)=8/3 and sin(x)<0, then find cos (x) sec(x) csc(x) i dont understand how u do this problem
September 14, 2008 by natash

Trig
Use a cofunction to write an expression equal to csc(4/11). I need help solving this problem. Thank You
May 11, 2011 by Rachal

TRIG HELP ASAP
I need help trying to find the major and minor axis on this problem: x^2+3y^2-6x+24y+6=0
January 23, 2012 by missy

math (more trig)
how could you do this problem? tinyurl 39jlf9 (sorry i cant get it to post because it is an internet address i cant seem to figure it out and it seems like there is not enough information or maybe i didnt pay attention in class i was able to get the one side that you can get ...
April 30, 2007 by jacob

Physics
a car travels 59.78 miles east in 89.67 minutes, then 89.67 miles north in 59.78 minutes, and then 29.89 miles at 59.78 degrees west of south in 149.45 minutes. whats the magnitude of the car's average velocity in miles per hour??? Please help!!!!!! P.S. please don't round ...
September 7, 2009 by Autumn

Chemistry
Can someone please help me solve this homework problem for my chemistry class.It's my last problem and I'm stuck!:/ Thanks :) A 4.0*10^1kg sample of water absorbs 308KJ of heat. If the water was initially at 25.5 C, what is its final temperature?
September 16, 2012 by Eliza

Trig
The problem is: an airplane is flying in the direction 120 degrees with an airspeed of 320 mph, and a 35 mph wind is blowing in the direction 60 degrees. The question ask to find the true course and the ground speed. To solve the problem I have done this: Flying 120sin 320_+...
June 2, 2014 by Morgan

Math (Trig)
I have a unit circle graph like the one at the top of a website (do a google search for 'unit circle trig functions' and click the second link, since I can't post links). I need to label the sine, cosine, tangent, secant, cosecant, and cotangent. I found several pictures that ...
March 18, 2007 by Chris

English grammar
Is it problems or problem? The possession of guns among law enforcement officials is at the core of the (problems or problem) of unnecessary force and the unwarranted killing of suspects. I appreciate all of your help. I'm just trying to proof reading a final draft. Thank you.
April 24, 2008 by Suzi Q

Trig
How do you solve this problem? y = 2sin 3x + 4sin 2x I haven't done these types of problems for awhile and have forgotten how to do them.
March 5, 2014 by Mary

Trigonometry/Geometry - Inequalities
Let a, b, and c be positive real numbers. Prove that sqrt(a^2 - ab + b^2) + sqrt(a^2 - ac + c^2) is greater or equal to sqrt(b^2 + bc + c^2). Under what conditions does equality occur? That is, for what values of a, b, and c are the two sides equal? This looks like a geometry...
December 7, 2013 by Sam

math
i m always having a problem in math. i can't do fraction easilly. im going to have an final exams , starting on 2 april . i hope if any one can help me. You need to tell us, in detail, what you don't understand about fractions. o!isnt the test the...SAT?? yes,,im good at math ...
March 17, 2007 by ammara

mathematics (percentages)
math problem: pedro wants to calculate his gpa. he has the lab grades:90/100,98/100,90/100,94/100,90/100,90/100,95/100,98/100. Labs are worth 20%. He has the test grades: 9/10,6/10,10/10,10/10,5/10,7/10,7/10,7/10,10/10,10/10,8/10,10/10. Homework is worth 20% test grades are: ...
December 5, 2006 by day

Math
The following scores were recorded on a 200-point final examination:193,185,163,186,192,135,158,174,188,172,168,183,195,165,183. Find the final examination score. Find the median final examination score. Is the mean or median a more useful representative of the final ...
February 15, 2008 by Babygirl

Math
The following scores were recorded on a 200-point final examination:193,185,163,186,192,135,158,174,188,172,168,183,195,165,183. Find the final examination score. Find the median final examination score. Is the mean or median a more useful representative of the final ...
February 15, 2008 by Tim

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

Math
3 tbsp. of extract are mixed with 250 ml. of oral suspension base. What is the final concentration of the suspension? I request the proper formula to figure out how to work this problem. Thank you.
August 19, 2012 by Denyse

Math - Trig
Hi I have a Trig question that i dont understand, can someone please explain how to solve for it using cosine law?? A Clock with a radius of 15 cm has an 11 cm minute hand and a 7 cm hour hand. How far apart, to the nearest centimetre, are the tips of the hands at each time? a...
April 30, 2008 by Mark

TRIGONOMETRY
Can someone please give me a step by step answer on how to find the complex cube roots of 8(cos(4π/5)+isin(4π/5))? I need to know how to do this for my trig final next week.
May 17, 2013 by Kate

Physics
Hi, here's a problem that I have difficulty with to solve. Block M2, w/c has a 20 kg mass, is on a frictionless table and it is firmly attached to one end of a spring with k = 2.5 N/m. The other end of the spring is anchored to the wall. Another block, M1 (and of the same mass...
November 2, 2011 by Chika

trig
Given that sin x = - 2/2 and that cos x is negative, find the other functions of x and the value of x. can you explain how this problem can be solved please.
January 30, 2011 by Anonymous

Chemistry
A 32.5g cube of aluminum initially at 45.8 C is submerged into 105.3g water at 15.4 C. What is the final temp of both substances at thermal equilibrium. Assume the al and the H2O are thermally isolated from everything else) Specific heat cap Al= .903 Specific heat cap H2O= 4....
April 24, 2011 by Phillip

Math
Please help The following scores were recorded on a 200-point final examination: 193,185,163,186,192,135,158,174,188,172,168,183,195,165,183. A. Find the mean final examination score B. Find the median final examination score. C. Is the mean or median a more useful ...
March 11, 2008 by Sherri

Quick Math Question
I was working out a problem and reached an answer of 3ln |x|+ (1/x)+ ln |x+1| The final given answer is (1/x) + ln |x^4 +x^3| I see that the (1/x) carried over and I know how the x^3 got there, but I'm confused as to the x^4. Can someone kindly explain this to me?
March 26, 2014 by Anonymous

trig
What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
April 21, 2008 by Joshua

trig
What is the shift along x of the following trig functions? y = (3sinx/2) + 4 y = -2sin(x)-4 y = sin(-3x + 3)
April 21, 2008 by Amandeep

trig
express the trig. ratios sinA,secA n tanA in terms of cotA.
May 7, 2011 by Anonymous

trig
How do you solve cos(2arcsin 1/4) using inverse trig. functions??!! PLEASE HELP ME!
May 9, 2011 by Tor

Trig
Find (if possible) the trig function of the quadrant angle. sec 3pi/2
June 6, 2011 by Master chief

trig
What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
April 21, 2008 by Priya

trig
What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
April 22, 2008 by Chaitanya

trig
how do i do this? give the signs of the six trig functions for each angle: 74 degrees?
December 3, 2008 by Tay

trig
simplify to a constant or basic trig function.. 1+tan(x)/1+cot(x)
March 14, 2010 by hilde

trig
find the 5 trig ratios when sin theta = -5/13 and lies in quadrant 3
September 14, 2011 by karen

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