# Questions on Algebra: Functions, Domain, NOT graphing answered by real tutors!

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 Question 28823: I need to simplify this faction- =(3x+1/x-1)+1 over (3x+1/x-1)-3 Click here to see answer by Bae(1)

 Question 29193: i am having problems with a question it is 3a(2b-4c) --------- b(a-c) a=-4 b=5 c=-2 i have no idea if i remove the brackets if i change the - to + please help Click here to see answer by Earlsdon(6294)

 Question 29250: Can someone pls help me with Simplifying Rational Expressions?, thanks! 1) 2) 3) Click here to see answer by Earlsdon(6294)

 Question 29339: [5x+4/2]=12 It wants me to rationalize the denominator and simplify. The brackets are supposed to be the lined ones but I can't do that on here. Click here to see answer by ikdeep(226)

 Question 29371: what is the constant of variation if y varies directly as x, and y=95 when x=19? Click here to see answer by stanbon(69061)

 Question 29412: im looking for the answer to f(g(x)) and g(f(x)), when f(x)=10x+1 and g(x)=sqrt 2x+1 Click here to see answer by stanbon(69061)

 Question 29439: I have been working on this problem for two weeks and still have not gotten it right. The problem is x^2+x<12 I have to solve it and then check it to make sure that I have it right. No matter how I've done it, it has been wrong. HELP! Click here to see answer by Bb(19)

 Question 29453: Could use some help here, did I do this correctly. Thanks If f(x)=3x-1 and g(x)=2X-1 Find f(g(2)) 3x(2x-1(2))-1 3x(4x-2)-1 12x^-6x-1 Click here to see answer by Earlsdon(6294)

 Question 29626: Did I do this correctly? Thanks for looking at this. Evaluate f(x)= 2x+1 for x=4 f(4)= 2(4)+1 f(4)= 8+1 f(4)= 9 f = 2.25 Click here to see answer by stanbon(69061)

 Question 29741: ? write a function rule for the table: x f(x) -1 3 0 0 1 -3 2 -6 please explain Click here to see answer by Cintchr(481)

 Question 28035: 40A firm packages and ships 1-pound jars of instant coffee. The cost C of shipping is 40 cents for the first pound and 25 cents for each additional pound. Write C as a funciton of the weight w in punds for 0 less than w less than or equal to 30. Click here to see answer by stanbon(69061)

 Question 29716: Assume that all variables represent real numbers. Indicate whether each equation determines y to be a function of x. y - 2x = 0 Can you help me understand the concept of finding the answer? Click here to see answer by sdmmadam@yahoo.com(530)

 Question 30254: evaluate each function rule for x= -2 f[x]=x-2 f[x]= 1/2x+2 Click here to see answer by longjonsilver(2297)

 Question 30251: Is each a function? Explain 1. {(1,9), (9,-1), (-1,8), (-9,1)} 2. {(2,5), (-2,4), (3,-8), (-2,7), (-1,4)} Click here to see answer by mukhopadhyay(490)

 Question 28897: hi i want to see if u can help me with this math probleam and how to do these probleams in the future. 2x+y=10 y=12x Click here to see answer by checkley71(8403)

 Question 28818: I want the symbols use in algebra such as n, pi, and their function? Click here to see answer by Nate(3500)

 Question 30626: If f(x)=x^2-x and g(x)=-3+x find the following: (a) f(g(x)) (b) g(f(x)) (c) f(f(-1)) (d) g(g(-3)) Click here to see answer by sdmmadam@yahoo.com(530)

 Question 30633: Decide whether the information defines a function. If it does, state the domain of the fuction input: a, b, c, d, output:0, 1, 0, 1 Click here to see answer by venugopalramana(3286)

 Question 30706: find all real numbers excluded from the domain of { { { f(x)= 16x^2-9/20x^2-23x+6 } } } then give the domain using set notation. Click here to see answer by venugopalramana(3286)

 Question 30766: Given the function f:x (maps to) 6x-2/x, x>0. Find the value of: a.)f^-1(-1) b.)f^-1(-4) Click here to see answer by longjonsilver(2297)

 Question 31012: Hello: I am having some trouble with this problem: x^3+8x^2+11x-20 I am to find all real zeros using DeCartes' Rule of Signs and Rational Zeros Theorem. My instructor never explained the Rule of Signs, and I don't understand it very well in the book. I have figured out p/q, but is there a way to find the zeros without plugging them into the f(x) individually? Thanks, Brad Olson Click here to see answer by venugopalramana(3286)

 Question 31115: Can you help me solve. 4/x-2 = 1+ 6/x+2 25x^2-9y^2/xy / 5/y - 3/x Click here to see answer by longjonsilver(2297)

 Question 31164: I don't understand how to figure this question out, y= x - 3 Click here to see answer by gymnast2598(2)

 Question 31244: ```How do you solve Pn A = ———————, for n? for P? for A? A - P``` Click here to see answer by AnlytcPhil(1539)

 Question 31282: For the function y = 1 ———— x - 1 Give the y values for x = -2, -1, 0, 1, 2, 3 Im not sure if i did this right x -2, -1, 0, 1, 2, 3 y -1.5, -2, ?, 0, -.5, -.6 Click here to see answer by troyapplehelen(46)