Thursday
December 18, 2014

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

Post a New Question | Current Questions

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 ...
Tuesday, December 16, 2014 at 7:40pm

trig
1. The sides of a triangle, in centimetres, are given by 3n-4, 3n+9, 4n+5. Draw a diagram to show the information. If the perimeter of the triangle is 114 cm, find the length of each side.
Thursday, December 11, 2014 at 10:27pm

Trig
What is the period of f(x)=sin4x. I got pi/2 but on my answer list, it is not on there. a.4pi b.2pi c.pi d.1/2pi Which one would i choose?
Thursday, December 11, 2014 at 11:06am

Pre-Calc/Trig...
what is In e^4.3 equivalent to? How?
Wednesday, December 10, 2014 at 1:49pm

Pre-Calc/Trig...
Which of the following could be an example of a function with a domain (-oo,oo) and a range (-oo,2)? Check all that apply. A. y= -(3)^x+2 B. y= -(3)^x-2 C. y= -(0.25)^x+2 D/ y= -(0.25)^x-2
Tuesday, December 9, 2014 at 11:14am

Trig
Verify each trigonimetric equation by substituting identities to match right hand side of the equation to the hand side of the equation. Please help. -tan^2x+sec^2x=1
Monday, December 8, 2014 at 2:25pm

trig
Solve R=3(1-sin theta) and graph
Monday, December 8, 2014 at 11:21am

Math (TRIG)
Please help me set up these problems. 1.) Find an equivalent equation in rectangular coordinates. r(1 - 2 cos θ) = 1 2.) Find a rectangular equation for the plane curve defined by the parametric equations. x = sec t, y = tan 3.) A projectile is fired with an initial ...
Monday, December 8, 2014 at 1:01am

Trig (math)
1.) Find all solutions of the equation. Leave answers in trigonometric form. x^2 + 1 - sqrt3i = 0 2.) Give the rectangular coordinates for the point. (9, 2pi/3) 3.) The rectangular coordinates of a point are given. Express the point in polar coordinates with r L 0 and 0° K...
Monday, December 8, 2014 at 12:21am

Trig (math)
1.) Write the complex number in trigonometric form r(cos theta + i sin theta) with theta in the interval [0°, 360°). 9 sqrt 3 + 9i 2.) Find the product. Write the product in rectangular form, using exact values. [4 cis 30°] [5 cis 120°] 3.) [4(cos 135° + i ...
Sunday, December 7, 2014 at 11:23pm

trig
Question #1 Suppose that θ is an angle in standard position whose terminal side intersects the unit circle at −−2029,2129 Find the exact values of cscθ cotθ sinθ .
Saturday, December 6, 2014 at 2:49pm

Math Trig
Let theta be an angle in quad III such that sec theta = -13/5. Find the exact values of cot theta and sin theta? Thank you!!!
Friday, December 5, 2014 at 3:11pm

Pre-Calc/Trig...
Use the rules of logarithms to expand [(x+3)^4(x-5)^7]
Friday, December 5, 2014 at 11:30am

Precalc/Trig
2 roads intersect at an angle of 60 degrees. A friend's mail box is 434 feet from that intersection and your mailbox is on the other road and is 525 feet from the intersection. How far is it from your mailbox to your friend's mailbox? I got 1016.66 feet, but that is ...
Thursday, December 4, 2014 at 11:18pm

Pre-Calc/Trig...
I have one way, but cant think of another? Show two ways of finding y if y = log4 64. Explain your thinking. 4^x=64 x=3
Thursday, December 4, 2014 at 1:20pm

Pre-Calc/Trig...
Write the equation y = log x in exponential form.
Thursday, December 4, 2014 at 12:42pm

Pre-Calc/Trig...
If An is defined as a geometric sequence, is the sequence 1/an also a geometric sequence? Explain your reasoning
Wednesday, December 3, 2014 at 6:12pm

Pre-Calc/Trig...
is this the correct formula for me to solve this? A bacteria culture has 2,000 bacteria. The number of bacteria increases by 5% each hour. How many bacteria are there after 12 hours? 2,000*0.05^(12-1)
Wednesday, December 3, 2014 at 5:47pm

Pre-Calc/Trig...
Find S5 for a geometric series for which a1 = 81 and r = 1/9.
Wednesday, December 3, 2014 at 5:33pm

Pre-Calc/Trig...
Given a geometric sequence with a1 = 6 and r = 2/3, write an explicit formula for An, the nth term of the sequence.
Wednesday, December 3, 2014 at 4:34pm

Pre-Calc/Trig...
The nth term of a geometric sequence is given by an = 1/4(4)^n-1. Write the first five terms of this sequence.
Wednesday, December 3, 2014 at 12:10pm

Pre-Calc/Trig...
Write the equation y = bx in logarithmic form.
Wednesday, December 3, 2014 at 11:21am

trig
How much does it cost to paint a triangular surface of sides 6m,5m, and 11m at the rate of rs.20/-per metre square.
Wednesday, December 3, 2014 at 8:28am

trig
a ship starts from port at a bearing of South 32 degrees East. It travels 8 miles in this direction before turning to a bearing of North 14 degrees East. It travels 15 miles in this direction, before finally turning to a bearing of South 72 degrees East and travels another 4 ...
Tuesday, December 2, 2014 at 7:50pm

Trig
a ships navigator determines that the ship is moving through the water at 17.5mi/h with a heading of 26.3 degrees north of east but the ship is actually moving at 19.3 mi/h in a direction of 33.7 degrees north of east. What is the velocity of the current? would this be 17....
Monday, December 1, 2014 at 12:43pm

Trig
A jet is 115 mi east and 88.3 i north of Niagara Falls. What is its displacement from Niagara Falls?
Monday, December 1, 2014 at 10:09am

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 ...
Monday, December 1, 2014 at 1:25am

trig
Two circles of radii 5 and 3 cm, respectively, intersect at two points. At either point of intersection, the tangent lines to the circles form a 60◦ angle, as in Figure 2.2.4 above. Find the distance between the centers of the circles
Sunday, November 30, 2014 at 11:15pm

Trig
I need help setting these up. 1.) Use the parallelogram rule to find the magnitude of the resultant force for the two forces shown in the figure. round to one decimal place. Theta= 35 degree, b=98 lbs, c=55lb 2.) Find the magnitude and direction angle for each vector. Five the...
Wednesday, November 26, 2014 at 7:17pm

TRIG!
true or false, the two sets of parametric equations x=t, y=t^2+1 and x=3t, y=9t^2+1 have the same graph. justify your decision.
Tuesday, November 25, 2014 at 11:22pm

trig
rewrite each equation in polar form. solve for r if possible a. 2x+3y=5 b. y=1/2x
Tuesday, November 25, 2014 at 9:57pm

Trig
Determine exact solution. x E (0, 2pi) 2csc^2x-8=0
Tuesday, November 25, 2014 at 8:50pm

trig
determine a set of parametric equations to represent the line segment that begins at the point(-2,6) and ends at the point (10,-4)
Tuesday, November 25, 2014 at 8:36pm

trig
solve each equation if 0 < x < 2pi. answer must be in radians 1. 4 cos x - 2 = 0 2. 3 sec^2 - 4 = 0
Monday, November 24, 2014 at 6:09pm

Pre-Calc/Trig
is the integer n odd or even, explain
Monday, November 24, 2014 at 2:39pm

Pre-Calc/Trig
Help me please, I don't understand this write using exponential notation √ 36* 3√ 64 oh and 3 is an exponent
Monday, November 24, 2014 at 10:51am

Trig
Does this result in no triangle, 1 or 2 triangles? If so, then solve. B= 88 degrees, b= 4 and a=23. I know that A= (sin 88)(23)/(4)= A=5.74 degrees C= 180-5.74-88= C=86.26 degrees c=(sin86.26)(4)/(sin 88)= c=3.99 My question is how do you know if it's 0,1, or 2 triangles. ...
Sunday, November 23, 2014 at 11:38pm

Trig- math
Find the area of a triangle if the sides of the triangle have the lengths 849mi, 930mi, and 1301mi. Here's my work: a=849 b=930 c=1301 A=.5(849)(930)sinA sin A = 394,785 mi^2 (this number doesn't seem right to me, can you explain to me what I did wrong)?
Sunday, November 23, 2014 at 7:25pm

trig
I need help setting this problem up. A force of 36lb is required to hold a 70lb toolbox on an incline. What angle does the incline make with the horizontal?
Sunday, November 23, 2014 at 7:18pm

Trig
I need help with my vectors unit. I'm really confused about how to set them up. Please help. a.) Given u=2i-5j and v=-i+3j, determine -6u-3v? b.) Find the component form of v if |v|=4 and the angle it makes with the x-axis is 60 degree. c.) Given u=5i+3j and v+3i+2j, find...
Sunday, November 23, 2014 at 7:03pm

Trig
Find the magnitude and direction angle for each vector. Give the measure of teh direction angle as an angle in [0,360]. <5sqrt2,-5sqrt2>
Sunday, November 23, 2014 at 2:00am

Math (trig)
The distance from home plate to dead center field in a certain baseball stadium is 409 feet. A baseball diamond is square with a distance from home plate to first plate base 90 feet. How far is it from first base to dead center field? I also need help setting this up.
Sunday, November 23, 2014 at 1:58am

Math (trig)
A force of 35lb is required to hold a 72lb toolbox on an incline. What angle does the incline make with the horizontal? Please help me set this up.
Sunday, November 23, 2014 at 1:56am

Trig
Two tracking stations are on the equator 161 miles apart. A weather balloon is located on a bearing of N 32°E from the western station and on a bearing of N 16°E from the eastern station. How far is the balloon from the western station? Round to the nearest mile.
Wednesday, November 19, 2014 at 8:30pm

trig
a boat is tied by a rope 12 meters long to a ring that is 3.5 meters above the water.If the rope is taut find the angle it makes with the water?
Tuesday, November 18, 2014 at 7:50am

Trig
Jane has a bike with a 22-inch rear wheel. The wheel sprocket is 3 inches in diameter and the pedal sprocket is 4 inches in diameter (the sprockets hold the chain.) How fast in miles per hour is she going if she pedals at a rate of 100 revolutions per minute?
Monday, November 17, 2014 at 8:33pm

Trig
the angle of elevation to the sun is 65 degrees. A building casts a shadow 16m long. What is the height of the building to the nearest meter?
Monday, November 17, 2014 at 7:43pm

Pre-Calc/Trig
Go over this with me please, I forgot how to do it. Solve the polynomial equation. 15x^3-119x^2-10x+16=0
Monday, November 17, 2014 at 12:36pm

trig
From the top of a tower of height 75m, a man sees two goats, both due west of him. If the angles of depression of the two goats are 10 degrees and 17 degrees, calculate the distance between them. It wants the angle of depression. I , myself, don't understand the question ...
Monday, November 17, 2014 at 3:37am

Derivative
Can you help me find the derivative of y= cos(x)/1+sin(x).. the / is a fraction bar. I have a hard time finding trig derivatives because I don't really know what the derivative of cos,sin ,or tan would be honestly.
Sunday, November 16, 2014 at 9:17pm

Trig
Determine the intervals of continuity of f(x)= ln(sin(x)) I looked at the graph and I have no idea how to state the intervals.
Sunday, November 16, 2014 at 5:27pm

Math
This one confused me since it revolved around what seemed like dividing trig function by another function Write the following expression in terms of the tangent function 2 / ((cos(r^2 - s^2) / (sin(r^2 - s^2)) = ? I know tan t = sin t / cos t. So would I multiply by the ...
Friday, November 14, 2014 at 1:37pm

Pre-Calc/Trig
Identify the asymptotes, removable discontinuities, and intercepts for the graph of the function. d(x)=(x^2-12x+20)/3x
Friday, November 14, 2014 at 12:29pm

Pre-Calc/Trig
What are the polynomial names for these functions. 1.) m(x)=x+x^2-1 2.) d(x)=x+ 3.14 3.) 2-6x^2+11x^3
Friday, November 14, 2014 at 11:35am

Trig/Pre-Calc
Solve the polynomial equation. 15x^3-119x^2-10x+16=0
Thursday, November 13, 2014 at 5:32pm

Pre-Calc/Trig
State the domain and range for each function. y=2x^2/(x^2-1) domain: ? range: ?
Wednesday, November 12, 2014 at 4:58pm

Pre-Calc/Trig...
Write a function with the following characteristics: A vertical asymptote at x=3 A horizontal asymptote at y=2 An x-intercept at x=-5
Wednesday, November 12, 2014 at 2:38pm

Pre-Calc/Trig
Identify the extrema for the function. Classify it as a relative (local) or absolute (global) maximum or minimum value. f(x)=4x^3-12x^2+15
Tuesday, November 11, 2014 at 4:37pm

math
Use Green's Theorem to evaluate F(x, y) = y cos x − xy sin x, xy + x cos x , C is the triangle from (0, 0) to (0, 4) to (2, 0) to (0, 0) I kind of understand how to do this , but I am having trouble with the trig
Tuesday, November 11, 2014 at 2:43pm

Pre-Calc/Trig
Describe the end behavior for function by writing a limit expression. f(x)=2x^5-x+7
Tuesday, November 11, 2014 at 1:13pm

Precalc/Trig
Sorry there are quite a few problems, but I just need to know if these are correct (and if they aren't, where I went wrong): 1. Solve these equations. tanθ = -√3 θ = 2π/3 + kπ θ = 5π/3 + kπ 2. secθ = √2 θ = π/4...
Tuesday, November 11, 2014 at 8:47am

calc/trig
A 84-ft tree casts a shadow that is 130 ft long. What is the angle of elevation of the sun?
Monday, November 10, 2014 at 8:51pm

trig
Find all angles è between 0° and 180° satisfying the given equation. cos è = 1/9
Monday, November 10, 2014 at 8:46pm

Pre-Calc/Trig
Help please State the x and y-intercepts for each function. f(x)= -x^3+4x
Monday, November 10, 2014 at 2:14pm

Pre-trig/Calc
Please help me. Use Descartes' rule of signs to describe the roots for each polynomial function. 3. m(x)=x^3+3x^2-18x-40
Sunday, November 9, 2014 at 2:22pm

trig
if x is a positive acute angle, then express tan(180+x) as a function of x
Saturday, November 8, 2014 at 6:45pm

Trig
House B is located at a bearing of N67°E from house A. House C is 370 meters from house A at a bearing of S68°E. House B is located at a bearing of N11°W from house C. Find the distance from house A to house B. (Round your answer to two decimal places.) Sorry, I ...
Saturday, November 8, 2014 at 2:13am

Math Trig Please Help!!!
Find exact values for all the solutions to the equation cos theta = sqrt 3/2 for -2pi <= theta <= 2pi Theta = Theta = Theta = Theta =
Friday, November 7, 2014 at 7:00pm

Pre-Calc/Trig
Use Descartes' rule of signs to describe the roots of the polynomial function. m(x)=x^3+3x^2-18x-40
Friday, November 7, 2014 at 4:17pm

Pre-Calc/Trig
Help me please. List all possible rational zeros for the polynomial function. p(x)=3x^3-2x^2-5x-2
Friday, November 7, 2014 at 2:18pm

Math Trig Help
sin theta = x/3, with theta in the first quadrant, find the expression for cos theta and tan theta. Answers will be in algebraic terms of x. Give exact answers with 0 < theta <pi/2 (0 less than or equal to theta, less than or equal to pi/2 Cos theta ? Tan Theta?
Friday, November 7, 2014 at 1:27pm

Trig
A playground slide starts 107cm above the ground and is 250cm long. What angle does the slide make with the ground? Give the answer to the nearest degree.
Wednesday, November 5, 2014 at 10:32pm

TRIG WORD PROBLEMS
from 25 feet away from the base of a building, the angle of elevation from the ground to the top of a building is measured 38 degrees. how tall is the building. WHat i did was put 25 feet on the base of the triangle the angle measurement oppsite and the longer leg x is this ...
Tuesday, November 4, 2014 at 11:52pm

RIGHT TRIANGLE TRIG
a kite is being flown 150 yards of string. the kite has an angle of elevation with the ground 65 degrees. how high above the ground is the kite. I DONT KNOW HOW TO SET UP THE PROBLEM
Tuesday, November 4, 2014 at 4:17pm

Pre-Calc/Trig...
Help me please Is the given linear expression a factor of the polynomial? Show work. f(x)=2x^3+x^2-5x+2; x+2
Friday, October 31, 2014 at 6:12pm

Math/Physics
My question is this: The potential at the surface of a sphere (radius R) is given by V_0 = k cos 3theta where k is constant. Find the potential inside and outside the sphere as well as the surface charge density (lower case sigma(theta)) on the sphere. (assume there is no ...
Thursday, October 30, 2014 at 2:45pm

Physics
To move a large crate across a rough floor, you push on it with a force (F) at an angle of 21 degrees below the horizontal. Find the force necessary to start the crate moving, given the mass of the crate is 32 kg and the coefficient of static friction between the crate and the...
Thursday, October 30, 2014 at 2:38am

Trig
I need to the steps to get (1-sinx)(1+sinx)=cos^2 x
Tuesday, October 28, 2014 at 9:22pm

Algebra 2 & trig
joanna invested $7500, part at a 5.5% and the remainder at a 6% annual rate of interest. if she collected a total of 435 in interest at the end of one year, how much money was invested at each rate?
Tuesday, October 28, 2014 at 4:05pm

Trig
A weight is oscillating on the end of a spring. The position of the weight relative to the point of equilibrium is given by y=1/12(cos8t-3sin8t), where y is the displacement (in meters) and t is the time (in seconds). Find the times when the weight is at the point of ...
Monday, October 27, 2014 at 5:28pm

Pre-Calc/Trig
y=-x^2+5x+36 converting into intercept form is this the correct answer? y=(x+9)(x-4)
Monday, October 27, 2014 at 3:28pm

Pre-Calc/Trig
How?? I only know how to convert standard form functions into intercept form, but I do not understand how to do this. Convert the functions into standard form. 1.y=2(x-4)(x+3) 2.y-2=-3(x+4)^2
Monday, October 27, 2014 at 2:10pm

Pre-Calc/Trig
I have looked this up, but still cant figure out what it is.. What is the projectile motion function?
Monday, October 27, 2014 at 1:01pm

Calculus/pre-trig
Write the formula for the discriminant. State the types of roots for a quadratic equation, explaining how the discriminant helps you determine the type.
Saturday, October 25, 2014 at 7:25pm

trig
simplify tan(-17 degree)+sin(24 degree)+cot(73 degrees)+cos(66 degrees in(-24 degree)
Saturday, October 25, 2014 at 5:37pm

Pre-Calc/Trig
How would I solve this one? I just can't get this one. 6x^2+11x-35=0
Saturday, October 25, 2014 at 4:45pm

Pre-Calc/Trig
Have i solved this correctly? x^2+3x-28=0 (x+7)(x-4)=0 x=-7 or 4
Saturday, October 25, 2014 at 4:29pm

Pre-Calc/Trig
How would I solve this? x^2+10x+24=0
Saturday, October 25, 2014 at 2:20pm

Math, Trig/Pre Calc
You have been asked to build a ramp for Dan’s Daredevil Motorcycle Jump. The dimensions you are given are indicated below. Find the height and incline in feet. Round to the nearest foot One side is 200 ft.The angle between the hypotenuse and the side of 200 ft is 13 ...
Friday, October 24, 2014 at 6:06pm

Pre-Calc/Trig...
Help me please Standard form: y=x^2-2x-3 Vertex form: ??? Intercept form: ???
Friday, October 24, 2014 at 5:56pm

Math Trig
I'll do my best to describe this problem. Given A=17 degrees, B=73 degrees , x=q, y=5 and z=r use the figure to find the exact value of q and r x = base y = leg z = hypotenuse a = angle between z and x b = angle between z and y 90 degree angle = between x and y Solve for q...
Friday, October 24, 2014 at 4:23pm

Trig calc
Find the coordinates of the point at -45 degrees on a circle of radius 3.6 centered at the origin. Round your answers to three decimal places.
Friday, October 24, 2014 at 2:18pm

Trig
Find the coordinates of the point at -10 degrees on a circle of radius 2.7 centered at the origin. Round your answers to three decimal places.
Friday, October 24, 2014 at 2:17pm

Math Trig
A kite flier wondered how high her kite was flying. She used a protractor to measure an angle of 40 degrees from level ground to the kite string. If she used a full 120-yard spool of string, how high, in feet, was the kite? (Disregard the string sag and the height of the ...
Friday, October 24, 2014 at 1:55pm

Trig calc
A) P is approximately (0.883, 0.469), is a point on the unit circle with angle 28 degrees estimate the following. Sin 152 degrees = Cos 152 degrees =
Thursday, October 23, 2014 at 11:38pm

Trig / Calc
What angle (in degrees) corresponds to 18.96 rotations around the unit circle? Enter the exact decimal answer.
Thursday, October 23, 2014 at 10:20pm

Trig/Pre-Calc...
Please help me with this. The finishing time for a runner completing the 200-meter dash is affected by the tail-wind speed, s. The change, t, in a runner's performance is modeled by the function shown below: t= 0.0119s^2 - 0.308s - 0.0003 Predict the change in a runner'...
Thursday, October 23, 2014 at 5:46pm

Trig
Verify and identify, I am so confused on how to do this? this is an extra credit but I am lost, please help. cot(Ý-ƒÎ/2)=-tan​ Ý
Wednesday, October 22, 2014 at 12:30pm

Pre-Calculous (Trig)
The Singapore Flyer, currently the world's largest Ferris wheel, completes one rotation every 37 minutes.1 Measuring 150 m in diameter, the Flyer is set atop a terminal building, with a total height of 165 m from the ground to the top of the wheel. When viewed from Marina ...
Friday, October 17, 2014 at 9:44pm

Pre-Calc/Trig...
Helpp needed, this is sort of confusing me. Describe the nature of the roots for this equation. 2x^2-x+1=0 A. Two real, rational roots B. Two real, irrational roots C. One real, double root D. Two complex roots
Friday, October 17, 2014 at 1:27pm

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