Questions on Algebra: Trigonometry answered by real tutors!

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Question 64723: find the foci of the ellipse: 16x^2 + 25y^2 - 96x + 200y + 144 =0
Click here to see answer by stanbon(26297)

Question 63194: if cos=0.125, find sec.
Click here to see answer by 303795(562)

Question 64906This question is from textbook ALgebra 1
: 2 buildings are seperated by an alley. Joe is looking out of a window 60 feet above the ground in one building. He observes the measurement angle of depression of the base of the second building to be 50 degrees and the angle of elevation of the top to be 40 degrees.How high is the second building?This question is from textbook ALgebra 1

Click here to see answer by venugopalramana(3286)

Question 64807: solve the system: 4x+3y-11z=8
x+y-3z=3
Click here to see answer by venugopalramana(3286)

Question 64808: solve the system: x^2-144y^2=144
x^2+y^2=144
Click here to see answer by venugopalramana(3286)

Question 65198This question is from textbook
: Find the radius of a circular arc of length 12cm that subtends a central angle of radian measure 1.5.This question is from textbook

Click here to see answer by 303795(562)

Question 65236: I'm having trouble sloving a problem that uses cardinal directions as a part of the problem.
You wish to find a distance across a swamp.The bearing from A to B is N 32 degrees W. You walk 50 meters from A, and at the point C the bearing to B is N 68 degrees W. Find the bearing from A to C and the distance from a to B. Thanks
Click here to see answer by 303795(562)

Question 63179This question is from textbook advanced mathematical concepts
: give the angle measure represented by each rotation.
3 rotations clockwiseThis question is from textbook advanced mathematical concepts

Click here to see answer by 303795(562)

Question 65309: Solve an interval {hint: [0,2pie)} sinx + cosxcotx= 1/sinx?
Click here to see answer by amran(4)

Question 64533: How would i figure this out,
"Find the remaining lengths of the two sides. AngleB=52 degrees, side a=5 m"
Thank you!
Click here to see answer by venugopalramana(3286)

Question 65913: Prove that this equation is an identity: ? (sinx + cscx)² + (cosx + secx)² º tan²x + cot²x + 7

Click here to see answer by uma(370)

Question 65913: Prove that this equation is an identity: ? (sinx + cscx)² + (cosx + secx)² º tan²x + cot²x + 7

Click here to see answer by Edwin McCravy(2922)

Question 66142: please explain this question:- To prove:-
cot(x)/1+tan(x)= cot-1/2-sec^2(x)
Click here to see answer by stanbon(26297)

Question 66151: Can you help me in determining in what Quadrant does -25 pie / 8 terminate? Thank you very much! Sarah Mcguire
Click here to see answer by stanbon(26297)

Question 66160: Can you let me know if I answered this math problem correctly?
If Sin theta = -2/3 find Sin of (-theta)
I came up with Sin theta = 2/3.
Thank you.
Sarah McGuire
Click here to see answer by Nate(3495)

Question 66173: Could you help me with this problem?
What is the period and graph of y=2 cot(x+ pie over 2)?
Thank you very much for your help!
Sarah McGuire
Click here to see answer by stanbon(26297)

Question 66162: Can you help me with this trigonometry problem?
Give 5 keypoints and sketch the graphs of
y=3Sin (x-pie/3)
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Question 66295: The "x's" are actually thetas but for simplicity sake I am going to use "x" instead
tan^2x - sin^2x - tan ^2xsin^2x
I tried to replace the tan^2x's with (sin^2x)/(cos^2x) but I didn't know where to go from there.. or if that even works.
thanks alot.

Click here to see answer by stanbon(26297)

Question 66301: (a) Express 8 Sin theta - 15 Cos theta, in the format: R.Sin(theta + beta)
(b) Using your answer to part (a), solve; 8 Sin theta - 15 Cos theta=8.5 for 0degrees<=theta<=360degrees
Click here to see answer by venugopalramana(3286)

Question 66347This question is from textbook algebra 2

: find an equation for the inverse relation:
y=-2x+5This question is from textbook algebra 2

Click here to see answer by venugopalramana(3286)

Question 66622: x^4 when x=2 and y=-8
Click here to see answer by rapaljer(3622)

Question 64338: find an angle between 0 and 360 degrees that is coterminal with the givin angle, 427 degrees
Click here to see answer by rapaljer(3622)

Question 67533: If you are given values for two sides of an oblique triangle and an angle opposite one of them, how would you arrive at the values of the missing parts? Will this result in a unique triangle?
Click here to see answer by Earlsdon(4900)

Question 67711: 7x2+17x+6
factoring trinomials of the form ax2+bx+c
Click here to see answer by stanbon(26297)

Question 67711: 7x2+17x+6
factoring trinomials of the form ax2+bx+c
Click here to see answer by prabhjyot(164)

Question 67833: sketch the graph f(x)=-2 + 2x -x2
Click here to see answer by stanbon(26297)

Question 67979This question is from textbook Holt Physics
: This is a a phsics homework assignment that i do not understand that deals with radians and trigonometry. ThanksThis question is from textbook Holt Physics

Click here to see answer by funmath(2873)

Question 68074: How do you find the area of a circle with a square (with side length of 2) inside of it?
Click here to see answer by stanbon(26297)

Question 68538: y = 2x^2 - 4x. for each function give the equation of the exis of symmetry, the coordinates of the vertex and the x- and y- intercepts of its graph
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Question 69005: what is the area of a 2ft wide walk around the outside of a garden that is 30ft long and 20ft wide?
Click here to see answer by Nate(3495)

Question 69020: a piece of wire is shaped to enclose a square, whose area is 121sq. in. it is then reshaped to enclose a retangle whose length is 13in. What is the area of the retangle in square inches?
Click here to see answer by ptaylor(1578)

Question 69280: Find all solutions of the equation 2sin(2x)=sqr rt of 3 in the interval [0,pi).
Click here to see answer by stanbon(26297)

Question 69282: If theta is an acute angle with cos theta=2/sqr rt 5, find the exact value of cos2 theta.
My possible answers are:
-3/5
-2/5
2/5
3/5
Click here to see answer by stanbon(26297)

Question 69287: Find all the solutions to the equation sqr rt 2sinx = 1.
I tried moving the sqr rt to the RS which I got x = 1/sqr rt 2. Not sure what to do from there.
Thank you for your help.
Click here to see answer by stanbon(26297)

Question 69281: Let H(t)= 4 + 4sin(pit/2). Approximate to the nearest hundreth, all values t in the interval [0,4pi] for which H(t)=6

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Question 69349: Find all solutions to the equation tanx = 1.
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Question 69292: Use the addition and subtraction formulas to simplify cos(x-3pi/2).
I came up with cosx for my answer. Is this correct?
Click here to see answer by jim_thompson5910(13794)

Question 69491: Theta = x
If x is an acute angle with cos x = 1/9, find the exact value of sin a/2.
Click here to see answer by Nate(3495)

Question 69491: Theta = x
If x is an acute angle with cos x = 1/9, find the exact value of sin a/2.
Click here to see answer by stanbon(26297)

Question 69517: I am trying to work out this problem of Express as a product sin(6t)+ sin(2t).
I am not sure where to begin.
Click here to see answer by jim_thompson5910(13794)

Question 69515: Find the exact value of cos^-1(cos(4pi/3)).

Click here to see answer by stanbon(26297)

Question 69494: I have theta = x.
How do I find the exact value of sin2x when x is an acute angle with cosx = 3/5.
Click here to see answer by stanbon(26297)

Question 69605: I am trying to use the addition and subtraction formulas to simplify sin(2pi-x). I am not sure where to begin.
Click here to see answer by Edwin McCravy(2922)

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