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

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Question 519696: if f(x)= 2x
find f(x+3)
please help me. i dont understand functions at all,
Click here to see answer by jim_thompson5910(28595)

Question 519729: I don't understand how to do this:
Find the domain of:
Thanks in advance :)!
Click here to see answer by josmiceli(9680)

Question 519763: I need step by step instructions on how to graph a step function. I don't need to see the graph but to just be instructed by words. The step function is
f(x) = 2[x] (ceiling function) for the domain -2 < x < 1 (the less than signs are less than or equal to). I would appreciate your help. I am having a lot of trouble on this problem and the help would be great. Thank you.
Click here to see answer by Alan3354(30993)

Question 519725: I need help in finding the domain of .
This is what I have:
1)
(x+7)(x-2)=0
x+7=0 OR x-2=0
x=-7 OR x=2
(,-7),(-7,2),(2,)
Test: -8 0 3
sign: + - +
(,-7)(2,)
2)

OR
OR

Domain= (,-7)(-7,2)(2,)
{x|x is a real number, x is not -7, x is not 2, ,}
Click here to see answer by Edwin McCravy(8909)

Question 519771: How u solve 2x-3y equal -19 can u please help me understand thank u
Click here to see answer by oberobic(2304)

Question 519829: I need to explain in detail how to solve the following problem: find the slope and y intercept of the given line X-7=0. Thanks in advance.
Click here to see answer by jim_thompson5910(28595)

Question 520198: for f(x)= 2-5x, find f(-2)
Click here to see answer by Tatiana_Stebko(1326)

Question 520207: let f(x)=x²-5x, find f(-2)
Click here to see answer by Tatiana_Stebko(1326)

Question 520376: how would find the value of 3[f(-2)] if f(x)=4x+2?

Click here to see answer by stanbon(57347)

Question 520376: how would find the value of 3[f(-2)] if f(x)=4x+2?

Click here to see answer by solver91311(16885)

Question 520683: Identify the vertex of the graph of f(x)=(x-5)^2-8
Click here to see answer by Math_prodigy(21)

Question 521539: Find (f*g)(x) and (g*f)(x) for each f(x) and g(x)
f(x)=x+5
g(x)=x-3
Click here to see answer by stanbon(57347)

Question 521929: 2/5*x=6=18
Click here to see answer by edjones(7569)

Question 522054: solve for x: y=(800/x)+20
Click here to see answer by Maths68(1474)

Question 522064: I f x + 1 / x = 3 t h a n x 2 + t / x 2 = ?
Click here to see answer by Maths68(1474)

Question 522270: f(x)=9x^4-25^2 how to find the zero of the function algebraically
Click here to see answer by stanbon(57347)

Question 522419: Write an equation in functional notation using this word problem..
Martin earns $7.50 per hour proofreading ads at a local newspaper. His weekly wage, w, can be described by the equation w = 7.5h, where h is the number of hours worked.
Click here to see answer by solver91311(16885)

Question 522847: Solve: f(-4)=4(-4)^(1/2) Is there no solution?
Click here to see answer by Alan3354(30993)

Question 522819: suppose that f and g are a pair of inverse functions. if g(-8)=3, what is f(3)?
Click here to see answer by jim_thompson5910(28595)

Question 523136: 3x+4y=0
4x+2y=3
Solve by elimination
Click here to see answer by scott8148(6628)

Question 523189: given the function f(x)=x+3/2x-1, find f(0)
Click here to see answer by stanbon(57347)

Question 523233: what is the domain of f(x)= the square root of (x-4) over the set of real numbers?
Click here to see answer by lwsshak3(6505)

Question 523284: evaluate the function rule f(a)=-3a+5 to find f(-3)
Click here to see answer by Alan3354(30993)

Question 523285: evaluate the function rule f(a)=-3a+5 to find f(-3)
Click here to see answer by Alan3354(30993)

Question 523306: to convert a length in inches to centimeters c, multiply by 2.54 give the domain range & formula

Click here to see answer by stanbon(57347)

Question 523528: I need to find the domain of this equation: f(x)=4/3x+7
Click here to see answer by oberobic(2304)

Question 523286: The function f is linear and satisfies f(d+1)-f(d)=3 for all real numbers d. What is f(3)-f(5)? Please show your work.
Thanks in advance for your help!
Click here to see answer by richard1234(5390)

Question 524386: f(x)=x^3-x^2-34x-56

Click here to see answer by solver91311(16885)

Question 524621: f(a+2)=(a+2)+7
Click here to see answer by Alan3354(30993)

Question 525668: My problem is: (x+5)^2 + 4(x+5) - 32
I don't understand how to do this problem at all, but I did try. I somehow simplified it into this:
x(x + 4 + 32/x)
I asked my teacher if I did it right and she said no, but didn't tell me the right answer or how to do it. I am in honors Algebra II and she says she shouldn't have to teach an honors student. So, I need help because I can't figure it out, and I don't even know what I am doing. Could you please help me?
Click here to see answer by Maths68(1474)

Question 525839: If f(x)=3x+7 and g(x)=x-2x find the value of f(-2)
Click here to see answer by Tatiana_Stebko(1326)

Question 525838: If f(x)=3x+7 and g(x)=x-2x find the value of f(3)
Click here to see answer by Tatiana_Stebko(1326)

Question 525831: determine the y-intercept of the equation: 2x-3y=12
Click here to see answer by Tatiana_Stebko(1326)

Question 525866: What is the rule that represents the function of the following ordered pairs?
(0,1), (1,3), (2,9), (3,27), (4,81)
I have been working on this for 2 hours and cannot figure it out.
Thank you.
Click here to see answer by jim_thompson5910(28595)

Question 525822: state the range of the relation: {(2,0),(-3,1),(0,-2)}
Click here to see answer by Tatiana_Stebko(1326)

Question 525956: f(x) = x + 7
g(x) = sqrt (x)

f + g
f - g
fg
f/g
Click here to see answer by edjones(7569)

Question 526182: What does ! mean? As in 5!. I heard it means down factoring. (5*4*3*2*1) or 120? Am I correct or wrong. If so what. Thanks.
Click here to see answer by Alan3354(30993)

Question 526559: find the vertix of the parabola
f(x)=25-10x+20x^2
Click here to see answer by Alan3354(30993)

Question 526701: ordered pairs (1,81), (2,100), (3,121), (4,144), (5,169) what is the rule that represents this function? Could you please help so I can help my daughter understand. Thank-you
Is it y=8x?
Click here to see answer by jim_thompson5910(28595)

Question 527133: Find the domain of the following rational expression:
3x^2 over x+4
Click here to see answer by oberobic(2304)

Question 527240: Is this a function? {(6,-2)(6,-3)(-3,5)
Click here to see answer by stanbon(57347)

Question 527334: find the domain of the given function
f(x)=3x^3-4x^2+x-1
Click here to see answer by jim_thompson5910(28595)

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