Tuesday

April 28, 2015

April 28, 2015

**Math (Trig)**

Rewrite the following expression in terms of tan3x: (sin2x + sin4x)/(cos2x + cos4x)
*Monday, September 29, 2014 at 5:32pm*

**Pre-Calc/Trig**

Helpp please State the domain and range of each of the following functions: 1. f(x)=1/(x+3) 2. g(x)=√x+6 3. h(x)=x^3+2x+5
*Sunday, September 28, 2014 at 4:36pm*

**Pre-Calc/Trig**

Help Please Find (fog)(2) and (f+g)(2) when f(x)= 1/x and g(x)=4x+9
*Sunday, September 28, 2014 at 3:49pm*

**Trig**

A railroad tunnel is shaped like a semiellipse as shown below. A semiellipse is shown on the coordinate plane with vertices on the x axis and one point of intersection with the positive y axis. The height of the tunnel at the center is 27 ft and the vertical clearance must be ...
*Saturday, September 27, 2014 at 2:42pm*

**trig**

karen, (who is 1,6m tall) wishes to calculate the height of a tall tree. she stands 50m from the base of the tree and measures its angle of elevation to be 36 degrees. determine the height of the tree?
*Wednesday, September 24, 2014 at 4:26am*

**Math Precal/Trig**

Solve for n. 7((1-(-3)^n)/(1-(-3))=3829 I was confused on distributing the number 7, because we've always had problems with the number 1 on the outside.
*Thursday, September 18, 2014 at 11:07pm*

**trig**

if 15 sin theta=8 cos theta , then what is sin theta-cos theta/sin theta +cos theta
*Thursday, September 18, 2014 at 8:02pm*

**trig**

A bird at the top of a tree looks down on a field mouse at an angle of depression of 65°. If the field mouse is 30 meters from the base of the tree, find the vertical distance from the ground to the bird’s eyes. Round the answer to the nearest tenth.
*Thursday, September 18, 2014 at 2:30pm*

**trig**

A planes actual resulting ground speed and direction are 550 mph and N26E. A wind is blowing from the northeast. If the pilot is holding a course of N27E how fast is the wind blowing I'm just stumped. It's an extra credit question is basically why I'm stumped.
*Tuesday, September 16, 2014 at 3:23pm*

**Trig**

A planes actual resulting ground speed and direction are 550 mph and N26E. A wind is blowing from the northeast. If the pilot is holding a course of N27E how fast is the wind blowing?
*Tuesday, September 16, 2014 at 3:21pm*

**trig**

if acos^3x+3acos.sin^2x=m asin3x+3acos^2x.sin=n proof that-(m+n)^2/3+(m-n)^2/3=2a^2/3
*Sunday, September 14, 2014 at 4:54am*

**trig**

proof that (m+n)^2/3+(m-n)^2/3=2a^2/3
*Sunday, September 14, 2014 at 4:49am*

**trig**

I have arrived at .322 as the sine of the angle how do I find the actual angle (in decimal/deg)
*Saturday, September 13, 2014 at 4:49pm*

**Trig**

Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with, and on the same side of, the obelisk. If they find that the angles of elevation from the ground where they are standing to the top of the obelisk are 65 degrees and 44 ...
*Wednesday, September 10, 2014 at 4:36pm*

**Trig**

Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with, and on the same side of, the obelisk. If they find that the angles of elevation from the ground where they are standing to the top of the obelisk are 65 degrees and 44 ...
*Wednesday, September 10, 2014 at 4:34pm*

**trig**

the 40ft. pole is braced by , a wire from its top in a point 60ft. from its base up, snd 18° slope. how long is the wire?
*Wednesday, August 27, 2014 at 7:41am*

**trig**

A spring is attached to the ceiling and pulled 17 cm down from equilibrium and released. After 3 seconds the amplitude has decreased to 16 cm. The spring oscillates 13 times each second. Assume that the amplitude is decreasing exponentially. Find an equation for the distance, ...
*Sunday, August 17, 2014 at 8:41pm*

**trig**

bike tires are 22 inches in diameter and has an angular speed of 5 miles per second, how fast is the bike traveling in mph
*Friday, August 15, 2014 at 5:20pm*

**Precalculus/Trig**

I can't seem to prove these trig identities and would really appreciate help: 1. cosx + 1/sin^3x = cscx/1 - cosx I changed the 1: cosx/sin^3x + sin^3x/sin^3x = cscx/1-cosx Simplified: cosx + sin^3x/sin^3x = cscx/1-cosx I don't know where to go from there. 2. (sinx + ...
*Friday, August 15, 2014 at 12:14pm*

**Precalculus/Trig**

Prove the following identity: 1/tanx + tanx = 1/sinxcosx I can't seem to prove it. This is my work, I must've made a mistake somewhere: Converted 1/tanx: 1/sinx/cosx + sinx/cosx = 1/sinxcosx Simplified 1/sinx/cosx: cosx/sinx + sinx/cosx = 1/sinxcosx Found common ...
*Thursday, August 14, 2014 at 8:30pm*

**trig**

the angle of from the top of a 41 fdepression as measured oot tower to a reference point on the ground is 65 degrees. How far away, to the nearest foot, is the reference point from the base of the tower
*Thursday, August 7, 2014 at 10:01pm*

**Math - trig**

Determine the general solution of 8 cos^2x - 4cosx - 1 =0 (8cos^2x - 4cosx)/8 =1/8 cos^2x - 4cosx=1/8 cos^2x/cosx =1+4cosx/cosx cosx = 5 x = cos^-1(5) x = error
*Saturday, July 26, 2014 at 12:28pm*

**trig**

two poles of height 25 cm & 20 cm are are parallel to each other with a distance of 12 cm between them. what is the distance between the top of the two poles?
*Saturday, July 26, 2014 at 12:48am*

**trig**

In 60 ft. Run sith a 21 degree slope what is rise(ft)
*Wednesday, July 16, 2014 at 9:15pm*

**trig**

Wires are attached to a pole to make it more secure. The diagram shows one of those wires having a length of 220 feet. The angle of elevation from the ground to the top of the pole is 36. What is the height of the pole? A. 178.0 ft B. 374.3 ft C. 159.8 ft D. 129.3 ft
*Tuesday, July 15, 2014 at 8:05pm*

**trig**

evaluate the expression under the given conditions tan 2 theta; cos theta=7/25, theta in quadrant I
*Wednesday, July 9, 2014 at 11:41pm*

**Trig laws**

Given the area ABC=7.52m©÷. Find a, when m¡ÐB=40¡Æ and c=6m.
*Sunday, June 22, 2014 at 8:55pm*

**Trig laws help**

mÚA=15.52, c=18ft, b=16ft, then a=? ft
*Sunday, June 22, 2014 at 6:38pm*

**trig**

if (-12,5) is a pointon the terminal side of an angel 0 find the exact value of six trig funcation of 0
*Thursday, June 19, 2014 at 6:45pm*

**Math: Trig**

What is Arcsec(-2) equal to and how can you find the correct answer? I got 2pi/3 but it was marked wrong on my test and I'm not sure why it's wrong. Can you please explain this to me? Thanks!
*Monday, June 16, 2014 at 7:38pm*

**trig**

how do you find algebraically the measure of the obtuse angle, to the nearest degree, that satisfies the equation 3 sec theta = 5 is it sec theta = 5/3 and then cos -1 (5/8) = 0.4
*Wednesday, June 11, 2014 at 8:17pm*

**trig**

Hi there! I NEED SERIOUS HELP, PLEASE!!! i have such a hard time with verifying identities! The question is: [(sin(theta/2)) / csc(theta/2)] + [(cos (theta/2) / sec(theta/2)] = 1 I have a few ideas on how to solve this, but am mainly not sure how to get rid of (theta/2). I am ...
*Wednesday, June 11, 2014 at 5:14pm*

**trig**

A weight attached to a long spring is bouncing up and down. As it bounces, its distance from the floor varies periodically with time. You start a stopwatch. When the stopwatch reads 0.3 seconds, the weight reaches its first high point 65 cm above the ground. The next low point...
*Monday, June 9, 2014 at 12:16am*

**trig**

Establish the following identity: CosA/1-TanA + SinA/1-CotA = CosA-SinA
*Friday, June 6, 2014 at 9:30am*

**trig**

Given that cos A = 5/13 and A and B are both acute angles, calculate the value of Sin2A and Cos2A
*Friday, June 6, 2014 at 9:26am*

**trig**

A car drives 1000 feet on a road that is 8 degrees to the horizontal, as shown in the figure. The car weighs 3400 lb. Thus gravity acts straight down on the car with a constant force F=-3400j. Find the work done by the car in overcoming gravity?
*Friday, June 6, 2014 at 5:00am*

**trig**

in triangle ABC, a = 2, b = the square root of 3, and m,angle C = 30 degrees. What is the value of c? a= 1 b= 2 c= 2square root of 3 d=square root of 3 over 3
*Thursday, June 5, 2014 at 9:26am*

**Trig**

Find the coterminal angles: one positive one negative angle. 55° and (9(3.14)/5) answer degrees in radians and radians in degrees
*Wednesday, June 4, 2014 at 10:33am*

**trig angle of elevation**

The eyes of a basket ball player are 6 feet above the floor. He is at the free-throw line, which is 15 feet from the center of the basket rim. The center of the rim is 10 feet above the floor Before shooting the player decides to step back a few steps. His angle of elevation ...
*Wednesday, June 4, 2014 at 2:46am*

**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_+...
*Monday, June 2, 2014 at 11:14pm*

**trig**

To guard against a fall, a ladder should make an angle of 75o or less with the ground. What is the maximum height that a 20-foot ladder can reach safely to the nearest tenth of a foot? in my diagram I set it up using the sin function since I want to find the height so I did (...
*Monday, June 2, 2014 at 9:47pm*

**trig**

Draw the graph of f(x) = tan x and g(x) = 2cos x for 180 _< thetha _< 180 {since its a graph I'm sure how to draw it here}
*Monday, June 2, 2014 at 4:23pm*

**check my set up please, trig**

Sarah holds the end of her kite string 5 feet off the ground. The kite string makes a 43 degree angle of elevation with the horizontal and the kite is 105 ft. off the ground. How long is the kite string to the nearest tenth of a foot? cos43=100/x ?
*Monday, June 2, 2014 at 1:54am*

**help please trig**

According to the Americans With Disabilities Act, a ramp can rise no more than 1 ft for every 12 ft of horizontal distance. To the nearest tenth degree what is the maximum angle that the ramp can form with the ground?
*Friday, May 30, 2014 at 7:40pm*

**trig! check my answe please**

An advertising blimp hovers over a stadium at an altitude of 125 m. The pilot sights a tennis court at an 8o angle of depression. To the nearest meter, find the ground distance in a straight line between the stadium and the tennis court. I set it up 125/tan8, knowing its a ...
*Friday, May 30, 2014 at 1:38pm*

**Trig**

I was wondering, is a sinusoidal function an algebraic model? Or, on the other hand, is there a way to derive an algebraic model from a sinusoidal function?
*Thursday, May 29, 2014 at 11:42pm*

**Trig**

Hi, I would like to ask anyone available a quick question. How would I explain WHY it is that the data/function of average monthly temperatures for a location are a sinusoidal function? I am having trouble phrasing and explaining it, although I am aware that it is in fact ...
*Thursday, May 29, 2014 at 11:31pm*

**Trig**

Charo is 50 feet from the tallest totem pole, located in Alberta Bay, Canada, which has a height of 173 feet. If Charo’s eyes are 5 feet from the ground, find the angle to the nearest degree of elevation for her line of sight to the top of the totem.
*Thursday, May 29, 2014 at 3:24pm*

**trig**

Solve (1+tan square A)(1-sinA)(1+ sinA)
*Wednesday, May 28, 2014 at 5:22pm*

**trig**

At a horizontal distance of 101 meters from the base of a tower, the angle of elevation to the top is 15 degrees. Find the line of sight distance to the nearest meter.
*Wednesday, May 28, 2014 at 3:03pm*

**trig**

earth is 149 600 000 km from the sun. this distance is equal to 1 A.U (astronomical unit). Mars is seen form earth to make an angle of 68degrees with the sun. a) draw a diagram and label b)how far are earth and mars c) do you think the distance between earth and mars are the ...
*Tuesday, May 27, 2014 at 11:30pm*

**trig length**

To secure a 610-meter radio tower against high winds, guy wires are attached to a ring on the tower. The ring is 7 meters from the top. The wires form a 69o angle with the ground. To the nearest hundredth meter find the length of the guy wire
*Tuesday, May 27, 2014 at 9:36pm*

**trig**

A road has a 10% grade (slope). To the nearest degree what is the angle of elevation of the road? should I use sin?
*Tuesday, May 27, 2014 at 7:56pm*

**Trig**

You and a friend are rowing a boat 8.5 KPH heading north. A cross current is moving 3.2 KPH at an angle of 38 degrees north of the west direction. How fast are you actually moving and what direction are you actually heading?
*Tuesday, May 27, 2014 at 7:30pm*

**trig**

A 15 ft. ladder makes a 35o angle with the side of a house. To the nearest tenth of a foot how high up on the house does the ladder come?
*Tuesday, May 27, 2014 at 7:17pm*

**trig**

From a rock ledge the angle of elevation to the topof a treeis 25 degrees. The angle of depression to the bottom of the tree is 10 degrees. Find the heightof the rock ledgeto the nearest tenth and find the height of the tree to the nearest tenth
*Tuesday, May 27, 2014 at 10:20am*

**trig**

A kite string is 65 metres long and makes an angle of 32 degrees with the ground. Calculate the height of the kite above the ground to the nearest metre.
*Sunday, May 25, 2014 at 5:24pm*

**math trig**

a 3.8m ladder rests against a vertical wall and makes an angle of 38 degrees with the wall. how far does the ladder reach up the wall?
*Sunday, May 25, 2014 at 6:58am*

**trig**

Robert is standing on a cliff and looks down at an angle of depression of 62 degrees to look at a boat. The cliff is 76 feet high. How far is the boat from the cliff? Round your answer to two decimal places. The boat is _________ feet from the cliff.
*Saturday, May 24, 2014 at 11:57pm*

**Trig**

What is the common ratio, r, for the sequence represented by the formula an = 3(2)^-n? 1/2 2 3 6 Is it 2?
*Saturday, May 24, 2014 at 1:06am*

**trig**

A loading ramp is 35 feet long and forms an angle measuring 10° with the ground. How high is the top end of the ramp off the ground? Round your answer to the nearest tenth?
*Thursday, May 22, 2014 at 6:40pm*

**Trig help**

What values for theta(0<_theta<_2pi) satisfy the equation? 3sin theta = sin theta-1
*Tuesday, May 20, 2014 at 12:21pm*

**Trig**

A 24-foot ladder is placed against a building. The building is perpendicular to the level ground so that the base of the ladder is 11 feet away from the base of the building. How far up the building, in feet, does the ladder reach? Round to nearest hundredth.
*Monday, May 19, 2014 at 12:53pm*

**Precal/trig**

sina=3/5, pi/2<a<pi evaluate cos2a
*Monday, May 19, 2014 at 12:54am*

**trig**

In right ∆LMN, sin M = 0.759. What is cos N?
*Friday, May 16, 2014 at 10:10am*

**Math - Int Trig**

31) Locate, name, and classify the extrema of the function. Determine intervals which the function is increasing and decreasing f(x) = -x(x^2 - 2) 32) Determine the end behavior of the function f(x) = 2x - x^3
*Friday, May 16, 2014 at 3:42am*

**Math - Int Trig**

Form a polynomial f(x) with real coefficients having the given degree and zeros 21) Degree: 4, zeroes: 2i and -3i 22) Degree: 3, Zeroes i and -10
*Thursday, May 15, 2014 at 9:36pm*

**Math - Int Trig**

Write an equation for the function that is finally graphed after the following transformations are applied to the graph y=|x|. The graph is shifted right 3 units, stretched by a factor of 3, shifted vertically down 2 units, and finally reflected across the x-axis.
*Thursday, May 15, 2014 at 1:07pm*

**Trig 3**

Why does 1 - COS2(Squared) _________________ COS2 = tan2
*Thursday, May 15, 2014 at 9:56am*

**Help me trig.**

solve the equation in the interval [0,2pi) tan (t/2)-sint=0
*Wednesday, May 14, 2014 at 10:54pm*

**Trig**

Find a parametric equation for the ellipse. Make sure that the graph of your parametric equation is a complete ellipse. 3x^2+4y^2=12
*Wednesday, May 14, 2014 at 7:41pm*

**Trig 2**

What is the smallest value for x where y = sin 2x reaches its maximum ...wtf that means.
*Tuesday, May 13, 2014 at 7:41pm*

**Trig help**

1. What is the period of the function? y = 4 cos pi x A. 1 B. 2 C. pi D. 2pi 2. Which represents the reference angle for 2pi/3? A. 2pi/3 B. pi/3 C. pi/4 D. pi/6
*Tuesday, May 13, 2014 at 6:56pm*

**Trig**

If it helps the answer according to this ACT compass sample test questions print out is 6.93. How to solve it is the question ... C is a 90 degree angle. AB is 8 and the hypotenuse. AC is the base .... we don't know it's length. It's on page 14 if you google this...
*Tuesday, May 13, 2014 at 9:31am*

**trig**

A man on a 135 feet cliff perpendicular (at 90 degrees) to the ground looks down at an angle of 16 degrees and sees his friend. How far away is the man from his friend? How far away is the friend from the base of the cliff? Sketch the triangle that matches this scenario with a...
*Monday, May 12, 2014 at 5:55pm*

**MATH: TRIG**

IF X IS AN ANGLE IN THE FIRST QUADRANT AND COSX= 3/5, FIND THE EXACT VALUE OF SIN2X DONT UNDERSTAND, KNOW THAT THE COSX IS ON A 3,4,5 TRIANGLE
*Monday, May 12, 2014 at 3:44pm*

**Trig**

Use trigonometric identities to solve the equation csc^2x -(√3+1)cotx+(√3-1)=0 in the interval [0, 2pi]
*Friday, May 9, 2014 at 6:39am*

**trig**

solve the equation on the interval [0, 2pi]: tan^2 x - 3 tan x + 2 = 0
*Thursday, May 8, 2014 at 10:01pm*

**Trig**

Evaluate tan(a-b). No decimals. Only exact answer. Sin a = -7/25, cot b = -8/15 neither a nor b are in quadrant IV.
*Wednesday, May 7, 2014 at 3:06pm*

**Trig**

Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 3:06pm*

**Trig**

Use the given information to evaluate sin (a+b). Exact answers only. No decimals. Tan a = 4/3, cos b ='-12/13; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 3:05pm*

**Trig**

Evaluate tan(a-b). No decimals. Only exact answer. Sin a = -7/25, cot b = -8/15 neither a nor b are in quadrant IV.
*Wednesday, May 7, 2014 at 12:48pm*

**Trig**

Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 12:46pm*

**Trig**

Use the given information to evaluate sin (a+b). Exact answers only. No decimals. Tan a = 4/3, cos b ='-12/13; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 12:42pm*

**Trig**

Simplify each expression using fundamental identities. 1. Sin theta cot theta 2. 1-sin^2 theta / cos theta
*Wednesday, May 7, 2014 at 12:37pm*

**trig**

a carousel has eight evely spaced seats shaped like animals. During each ride, the carousel makes between 8 and 9 clockwise revolutions. At the end of one ride, the carousel stops so that the lion is in the position where the zebra was when the ride started. through how many ...
*Wednesday, May 7, 2014 at 12:03pm*

**trig**

On an inclined road, which makes an angle of 25 degrees with the horizontal plane, stands a vertical tower. At a point Q, 150 ft from the base of the tower down the road, the angle of elevation to the top of the tower is 65. How high is the tower?
*Tuesday, May 6, 2014 at 11:58pm*

**trig**

Find all points of intersection of the polar curves r= 2 + 4cos theta and r= 6cos theta. Please explain in detail.
*Tuesday, May 6, 2014 at 3:30pm*

**Trig**

Given sin θ = −1/2 and sec θ > 0, find the exact value of tan 2θ. Radical 3 Radical 3/2 Negative radical 3 Negative radical 3/2
*Saturday, May 3, 2014 at 7:29pm*

**Trig**

Given sin x = 5/13 and 0 < x < pi/2 find the value of sin(π − x). 12/13 5/13 -12/13 -5/13
*Saturday, May 3, 2014 at 7:28pm*

**trig**

A soccer ball is placed 12 ft away from a goal post that measures 8ft high. You kick the ball and it hits the crossbar at the top of the goal. What was the angle of elevation of your kick?
*Thursday, May 1, 2014 at 5:08pm*

**Trig. Math**

A circle of radius 2 inscribed in a right triangle. Find the simplest expression possible for the triangle's area as a function of its hypotenuse.
*Thursday, May 1, 2014 at 3:57pm*

**Trig functions**

The average depth of the water in a port on a tidal river is 4m. At low tide, the depth of the water is 2m. One cycle is completed approximately every 12h. a)Find an equation of the depth, d(t)metres, with respect to the average depth, as a function of the time, t hours, after...
*Wednesday, April 30, 2014 at 8:55pm*

**trig**

On a typical day at an ocean port, the water has a maximum depth of 18m at 6:00 am. The minimum depth of 9m occurs 6.8 hours later. Write an equation to describe the relationship between the depth and time.
*Tuesday, April 29, 2014 at 11:25pm*

**Trig**

What is the sum of the arithmetic series where n=50 , t1=9 and t2=331
*Tuesday, April 29, 2014 at 5:01pm*

**Trig**

What is the sum of the arithmetic series where n=100 , t1=7 and t2=205
*Tuesday, April 29, 2014 at 4:59pm*

**Trig **

Find the 20th term of an arithmetic sequence with a=1 and d=1/2
*Tuesday, April 29, 2014 at 4:53pm*

**Trig**

Find the 6th term of the arithmetic sequence with a9=120 and a14=195
*Tuesday, April 29, 2014 at 4:51pm*

**Integrated Trig**

How many years will it take for an initial investment of $5,000 to double if it is invested at a rate of 3% compunded continuously? Compounded annually?
*Monday, April 28, 2014 at 2:16pm*

**Trig**

Write a quadratic equation whose roots are 5 + i radical 2 and 5 – i radical 2 ____ x^2 + _____ x+ ______=0
*Saturday, April 26, 2014 at 4:37pm*