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

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Question 988270: ***Please Help***
If f(x) = x + 5 and g(x) = 6x, then what is g(f)(x) -- that is, what is the value of the composite function, where we start with function f and end with function g -- if our starting input is 3?

Click here to see answer by MathLover1(20849)

Question 988331: Needing help working this function...
f(2/a)=5x^2+5x-2
Please show your work so I can understand how this problem works!
Thank you greatly!
Click here to see answer by Alan3354(69443)

Question 988249: If f(x) = x + 5
g(x) = 6x
and input is 2
Click here to see answer by Fombitz(32388)

Question 988694:
Click here to see answer by Alan3354(69443)

Question 988697: What's the domain and range of and show me how to get it
1)x(r)=3r^2-6+12
2)y=1/x-4
3)b(x)=7/-x^2

Click here to see answer by Boreal(15235)

Question 988801: Domain & range of 9/x
Click here to see answer by jim_thompson5910(35256)

Question 988812: Hello tutor. I have searched about Functions, Domain and Range in many websites but I'm not able to understand the concept. They've said that function is a relationship with two types of variables. Domain is the set of inputs and range is the set of outputs. Can you please explain it to me in an easier manner about what this is actually about? Thank you so much!
Click here to see answer by Timnewman(323)

Question 988678: I need help doing these 3 piecewise functions H(-4),F(-5) and G(-6)
Click here to see answer by Fombitz(32388)

Question 988824: Find the average rate of change for the given function from x=-1 to x=2.
A.4/3
B.-4/3
C.-3/4
D.3/4
Click here to see answer by Fombitz(32388)

Question 988824: Find the average rate of change for the given function from x=-1 to x=2.
A.4/3
B.-4/3
C.-3/4
D.3/4
Click here to see answer by stanbon(75887)

Question 988868: H(x)=2/(x-3)
l(x)=3-x^2
H(l(x))=
Click here to see answer by Shai(25)

Question 988857: what is the domain and range of f(x)=1+x^2 restricted to x<0??
Click here to see answer by josgarithmetic(39613)

Question 988992: what is the domain of f(x)=1/x^4
Click here to see answer by Timnewman(323)

Question 989376: Solve the following equation for y as a function of x. Find the domain.
xy+y-x = 9 Help would be appreciated.
Click here to see answer by solver91311(24713)

Question 989378: Find the domain of the following functions. Write your answer in interval notation.
f(x) = 7 + 3 x^2 - 9 x^4
Click here to see answer by solver91311(24713)

Question 989597: State the domain of the function. Justify answer f(x)=x squar
ed-3x
Click here to see answer by farohw(175)

Question 989751: (2-2y)^6 solve
Click here to see answer by Alan3354(69443)

Question 989764: Two minor league baseball players got a total of 390 hits. Washington had 4 more hits than Sanchez. Find the number of hits for each player.
Click here to see answer by stanbon(75887)

Question 989974: I keep getting 0 as my answer for this problem, but the answer key says 1/2. Any help would be greatly appreciated!!
Problem: Limit as x is approaching 0 of {{sqrt (1+x) -1}/(x)}
Click here to see answer by calculus93(1)

Question 990216: find the average rate of change of the function between
b). Show that the average rate of change is the same as the slope of the line. x = a and x = a + h
f(x)=�x+3
Click here to see answer by Boreal(15235)

Question 990280: How do I solve g(x)=4[[x]]
Click here to see answer by Alan3354(69443)

Question 990302: What is the solution for f(x) = 3x-1, find f(x-1) - f(2) this is a function.

Click here to see answer by MathLover1(20849)

Question 990306: The length of a rectangle is three times the width. Express the area, A, as a function of the width W.

Click here to see answer by Alan3354(69443)

Question 990412: X= 2y^2

Click here to see answer by Alan3354(69443)

Question 990366: how would you find the domain of a functions???

Click here to see answer by ikleyn(52747)

Question 990624: Find the domain and range of the function:
f(x)=x^2+3x+10/x^2+6x+5
Click here to see answer by ikleyn(52747)

Question 990701: Find all numbers that are not in the domain of the function.then give the domain in set notation.
F(v)= v^2+12 � v^2-3v-4
List any numbers that should be excluded from the domain.
Click here to see answer by ikleyn(52747)

Question 990708: Write the equation of the function g(x) if g(x) = f(x + 2) + 4 and f(x) = x^3 � 7.
Click here to see answer by jim_thompson5910(35256)

Question 990982: Let D (domain)= [1,2] and f be a correpsondence from D to ℝ that assigns the value 1 if x≤3/2 and the value 2 if x ≥ 4/3. Is f a function?
Click here to see answer by jim_thompson5910(35256)

Question 991061: Can you help me with this question?: Find the domain and range of a function:
f(x)= 3ln(6-2x) and solve the equation: f(x^2-2) = 0
I have tried this:
6-2x > 0
-2x > -6
x < 3 ...(-∞, 3) as a domain of this function?
Thank you!
Click here to see answer by ikleyn(52747)

Question 991217: What is the domain of y=-7/x
Click here to see answer by stanbon(75887)

Question 991271: Find the domain and range of the quadratic equation f(x)=x^2-8x-9
Click here to see answer by solver91311(24713)

Question 991271: Find the domain and range of the quadratic equation f(x)=x^2-8x-9
Click here to see answer by ikleyn(52747)

Question 991171: help please , thank you.
The function h is defined as : h(x)=17+x/6. What is the value of h(-18)?

Click here to see answer by Fombitz(32388)

Question 991389: Evaluate the function g(y)=10-4Y at g(s+11)
Click here to see answer by Fombitz(32388)

Question 991557: Given that f(x) = 2x + 1 and g(x) = 3x minus 1 over 2, solve for g(f(3))
Click here to see answer by farohw(175)

Question 991638: If f(6)=9 and
f(x)=g(x)+2, what point
can you determine on the graph of g?
Click here to see answer by Theo(13342)

Question 991669: let f(x)= 2x^3-5x/sqrt(7-x^2)
a. Determine whether the function is even, odd, or neither.
b. Use the result from part (a), conclude whether the function is symmetric with respect to x-axis, y-axis, both, or neither.
Click here to see answer by ikleyn(52747)

Question 991782: If y varies directly as x and inversely as the square root of w, and y=63 when x=7 and w=8, find when x=3 and w=18.
Click here to see answer by josgarithmetic(39613)

Question 991885: Please help me solve: Find f(k-1) when f(x) = 4x^2 - 3x + 7
Click here to see answer by Theo(13342)

Question 991974: What is F(x)=3x-8?...it also has domains which are -1,-2,-3,0,1,2,3
Click here to see answer by solver91311(24713)

Question 992193: In which set of ordered pairs is y a function of x?
{(1.25, 6), (3, 6), (5.75, 6), (11, 6)}
B
{(2, �15), (3, �12), (4, �10), (4, �8)}
C
{(6, 1), (3, 8), (3, 9), (6, 12)}
D
{(6.5, 10), (6.5, 0), (6.5, 9), (6.5, 12)}
I dont understand even though we went over it in class could you help me?
Click here to see answer by stanbon(75887)

Question 992209: Find an expression for the function f(x) whose graph is given by the top half of the circle. (x-5)^2+y^2=100
Click here to see answer by josgarithmetic(39613)

Question 992211: Find an expression for the function f(x) whose graph is given by the bottom half of the parabola. x+(y-9)^2=0
Click here to see answer by josgarithmetic(39613)

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