# Questions on Algebra: Trigonometry answered by real tutors!

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 Algebra: Trigonometry Solvers Lessons Answers archive Quiz In Depth

 Question 100573: Rewrite each equation as a function of x. -3x +4y = 11 I do not understand how to draw/make a graph in Word at all, if someone could please help me with this problem I would much appriciate it. Can anyone help me graph the problem below???? graph the functions f(x)= -2x - 5 Click here to see answer by ankor@dixie-net.com(15746)

 Question 100849: Suppose that sec(2t)=(-13/12), and that pi/2 Find the exact value of cos(t) Click here to see answer by stanbon(57962)

 Question 100848: Use appropriate identities to find the exact values of the following. a. sec(75degrees) so far I have sec(45deg+30deg)? then stuck. b. sin(7pi/12) I think this converts down to sin(2pi/3)? then stuck. Click here to see answer by stanbon(57962)

 Question 101115: 5(2x + y) - 4(2x + y) _>_ 4 Help with this problem and graph. PLEASE Click here to see answer by stanbon(57962)

 Question 101196: a.(1-tan^2u)/(1+tan^2u)=cos(2u) I think this is a half angle identity?verify the identity. b. compare the graphs of y1=(1-tan^2u)/(1+tan^2u) and y2=cos(2u) Click here to see answer by stanbon(57962)

 Question 101199: find the exact value of each. a. cos(theta)/2 if sin(theta)=12/13 and 0 b. sin[cos^-1(0) - sin^-1(1/2)] Click here to see answer by Nate(3500)

 Question 101198: solve each equation. assume 0<=t<=2pi and 0<=theta<=360degrees a. sin(t)=1/2 b. 2cos^2 theta - 3cos theta +1=0 c. sec theta= -5 give answer accurate to 3 decimals d. 2 cos(2t)=7cos(t) give answer accurate to 3 decimals Click here to see answer by Nate(3500)

 Question 101255: Let u=<-1,3> and v=<4,-6>. Find each of the following: a. 3u-2v b. The normalization of v Click here to see answer by stanbon(57962)

 Question 101253: Convert the rectangular point (-8,8sqrt3) to polar coordinates with r>0. Also give two additional ways to represent this point in polar coordinates for which r<0 and -2pi *and* r>0 and -2pi Click here to see answer by stanbon(57962)

 Question 101251: let z1=8(cos5pi/4 + isin5pi/4) and z2=2(cos5pi/12 + isin5pi/12) Find each of the following in the form a+bi a. z1/z2 b. (z2)^6 Click here to see answer by stanbon(57962)

 Question 101945: Solve each of the following systems by substitution. I am having major problems with these kind of problems...HELP, ZACK 5x - 2y= -5 1 y - 5x = 3 8x - 4y = 16 y = 2x - 4 This last problem the 4y and the y in the next prblem line up buy it isnt turning out like that before i submit it Click here to see answer by brianuh(2)

 Question 101955: The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle. it is Deb again with a word problem please help. Click here to see answer by doukungfoo(195)

 Question 102212: Solve each of the following systems by graphing. 3x - 6y = 9 x - 2y = 3 Again there is a graph with an 'Y' Line in the middle row down and an 'X' in the middle going across. I do not understand these. Click here to see answer by checkley75(3666)

 Question 102216: Theater tickets are \$8 for general admission and \$5 for students. During one evening 240 tickets were sold, and the receipts were \$1680. How many of each type of ticket was sold? HELP I am also so stupid with word problems. Help please. Click here to see answer by mathemanic(13)

 Question 102219: A coffee merchant has coffee beans that sell for \$9 per pound and \$12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for \$11.25 per pound. How much of each type of bean should be used in the mixture? Yes it is another word problem I do not understand well enough to do on my own, please help!! Click here to see answer by checkley75(3666)

 Question 102205: The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle. Click here to see answer by doukungfoo(195)

 Question 102381: ok technically its in a physics book, but its still dealing with trig. I can do problems like this but this one is just killin me...... thanks guys/gals -Andrew ps....ignore the red........its with the next problem Click here to see answer by stanbon(57962)

 Question 102507: Solve the system by substitution. x + y = 12 y = 2x Again I need help with this problem. I also need help with showing how the problem is done step- by- step. Then maybe I can actually figure out how to figure these things out by myself, please, and thank you!! Click here to see answer by doukungfoo(195)

 Question 102509: Please help me with this problem am having lots of problems with math especially graphing. Thank you. Solve the system by graphing. 3x + y = 1 9x + 3y = 3 Click here to see answer by stanbon(57962)

 Question 102510: Solve the system by addition or substitution. 3x + 6y = 0 x = 2/3 (this is a fraction) The 6y = 0 and x = 2/3 are supposed to be lined up under each other if this helps anyone, it doesnt help me that is why I need your help. Thank you. Click here to see answer by oberobic(2304)
 Question 102510: Solve the system by addition or substitution. 3x + 6y = 0 x = 2/3 (this is a fraction) The 6y = 0 and x = 2/3 are supposed to be lined up under each other if this helps anyone, it doesnt help me that is why I need your help. Thank you. Click here to see answer by stanbon(57962)

 Question 102518: Graph the inequality. 3x + y_<_5 Of course the line is a solid line under the < If someone could help me with this problem AND how to write the < with a line under it I would appreciate it. Click here to see answer by jim_thompson5910(28708)

 Question 102519: Graph the inequality. x < 2 Someone please help me with this I have no idea how to do this or how am I supposed to "make a graph on Word"--HELP!! Thank you so much for everyone who has helped me I really appreciate it. I am trying my best to thank all with an email but of course am running behind on that AND homework. Thanks again!! Click here to see answer by jim_thompson5910(28708)

 Question 102520: A small company produces both doll houses and sets of doll furniture. The doll houses take 3 hours of labor to produce, and the furniture sets take 8 hours. The labor available is limited to 400 hours per week, and the total production capacity is 100 items per week. Existing orders require that at least 20 doll houses and 10 sets of furniture be produced per week. Write a system of inequalities representing this situation, where x is the number of doll houses and y is the number of furniture sets. Then graph the system of inequalities. PLEASE help me with this again I am soo terribel with wrod problems like this. Click here to see answer by stanbon(57962)

 Question 102559: Find the domain of f(x)= 7+ the square root of 3x+21, and express it using interval notation. Click here to see answer by jim_thompson5910(28708)

 Question 102563: Find the inverse of the function f(x)= x^1/3 +2. Click here to see answer by stanbon(57962)

 Question 102554: Find the inverse of the function f(x)= X^1/3+2. Click here to see answer by stanbon(57962)

 Question 102562: The degree three polynomial f(x) with real coefficients and leading coefficient 1 has -3 and 4i among its roots. Express f(x)as a porduct of linear and quadratic polynomials with real coefficients. Click here to see answer by stanbon(57962)

 Question 102561: If f(x)= x(x+1) (x-4), use interval notation to give all values of x where f(x) >0. Click here to see answer by Nate(3500)

 Question 102761: Find values for m and b in the following system so that the solution to the system is (-3, 4). 5x + 7y = b mx + y = 22 Please help me with this. Thank you Debbie Click here to see answer by edjones(7569)