Thursday

December 18, 2014

December 18, 2014

**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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