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

Tutors Answer Your Questions about Functions (FREE)

Question 657118: I was wondering what values could make the following function UNdefined.
f(x)=.2x^2
Click here to see answer by Edwin McCravy(20054)

Question 657362: (x+3)2 + (y-1)2 = 16
Click here to see answer by solver91311(24713)

Question 657642: Please help me solve 6x/54=9

Click here to see answer by rfer(16322)

Question 657898: if the function f is defined for all numbers x by f (x)=2x-7 then what is the value of (-2)
Click here to see answer by ewatrrr(24785)

Question 657902: A rectangle is 2 feet wide and 3 feet long. Each side is increased by the same amount to give a rectangle with twice the area of the original one. Find the dimensions of the new rectangle. (Hint: Let x feet be the amount by which each side is increased.)
Click here to see answer by ewatrrr(24785)

Question 657907: I don't understand the breakdown in how to figure out this problem:
1/3(x+9)-1/4(x-4)=x-8
Click here to see answer by ewatrrr(24785)

Question 657924: The lower limit L (heartbeats per minute) of your target zone is a function of your age a(in years) and is given by the equation L(a) = - 2/3 a + 150.
a. Find the value of l for a person who is 30 years old.
b. Find the value of L for a person who is 45 years old.
Click here to see answer by MathLover1(20849)

Question 657909: 3(x+5)=4(x-5)
Click here to see answer by lenny460(1073)

Question 658406: how do you set up a linear function for the following word problem?
Nancy received a piggy bank containing $10.00 and adds an additional $1.00 per week. How much money is in her piggy bank after x weeks?

problem 2
if you use 300 gallons of gas in 4.8 hours, then find the rate of change ($gallons/hour)
Click here to see answer by stanbon(75887)

Question 658563: Determine whether 2x+4y=15 defines y as a function of x.
Click here to see answer by MathLover1(20849)

Question 658673: For the given functions f and g, find the requested function and state its domain.
f(x) = 4x - 3; g(x) = 8x - 9
Find f - g.
For the given functions f and g, find the requested function and state its domain.
f(x) = 3x + 4; g(x) = 4x - 6
Find f ∙ g.
For the given functions f and g, find the requested function and state its domain.
f(x) = 4x + 3; g(x) = 5x - 2
Find f/g

Click here to see answer by Tatiana_Stebko(1539)

Question 658833: What it the domain of the graph X^2 and why isnt it x can be all real numbers?
Click here to see answer by Shana-D77(132)

Question 659103: Pleas help me solve this problem.
Find the domain of the function and express your answer using interval notation.
f(x)=8sqrt(7-x)
I thought the answer was (-infinity,7), but that's not correct.
Click here to see answer by jim_thompson5910(35256)

Question 659386: (0,3/2),(2/3,1);3x+4y=6 are these pairs solutions
Click here to see answer by lynnlo(4176)

Question 659689: What is the average rate of change of the function f (x) = 9 � 5x between x = 1 and x = 2?
Click here to see answer by nerdybill(7384)

Question 659728: 3(3√x-1)+5 solve for domain and range
it is a cubic root function
Click here to see answer by lynnlo(4176)

Question 659787: 6b^4c^5 * b^6c^8
Click here to see answer by lynnlo(4176)

Question 659820: Range and Domain..
If f(x)=4x^2 - 4x + 5, find f(0)=

Click here to see answer by MathLover1(20849)

Question 659828: find the domain and range of y= 2+ (x^2/x^2+4)

Click here to see answer by lynnlo(4176)

Question 660028: Find and simplify the difference quotient of f,
f(x) = x^2+ 8x + 5
F(x+h)-F(x)
all over
h
Click here to see answer by math-vortex(648)

Question 660074: Given f(x)=3x+2 and g(x)=2x squared +1. Find f[g(2)]. Thank you for your help.
Click here to see answer by math-vortex(648)

Question 660213: Im helping my son with his precalc. This problem is giving us problems. I have not been able to find similar problems on the web. It has to do with difference quotient.
f(x) = 1/x
find (f(x)-f(1))/(x-1)
Thanks in advance,
Chris
Click here to see answer by Edwin McCravy(20054)

Question 660394: f(x) = 5/x + 4
g(x) = x /x + 4
find the domain of (f/g)(x)
Click here to see answer by MathLover1(20849)

Question 648770: (-2/3x)-12=0 (Find the zero of the function)
Click here to see answer by kevwill(135)

Question 660603: The sum of three consecutive odd integers is 147.
Click here to see answer by stanbon(75887)

Question 660614: I need help on how do you find the domain and range of a line on a graph I try so hard to understand but I just don't get it

Click here to see answer by stanbon(75887)

Question 660611: The product of two consecutive even integers is 168.
Click here to see answer by Alan3354(69443)

Question 660651: Find the Domain of the function: y= square root (13-x)
How do you know the domain?
Click here to see answer by Shana-D77(132)

Question 660648: Determine whether the equation defines y as a function of x : y= square root(7x-1)
How do you figure out if it is a function or not
Click here to see answer by Shana-D77(132)

Question 660634: f(x) = 5/x + 4
g(x) = x/x + 4
what will be the answer to (f-g)(x)=
Click here to see answer by Shana-D77(132)

Question 660731: PLEASE HELP! ASAP!! When lucy picks any number between 1and20, multiplies it by 5, adds 15, divides by 5, and subtracts 3, she always gets the number she started with. Why? Evaluate and use algebraic evidence to support your conclusion
,
Click here to see answer by Alan3354(69443)

Question 661159: What is the domain of f(x)= 2x^4 - 4x^2 + 8
Click here to see answer by swincher4391(1107)

Question 661157: How do I find the relation of y to x in the function of x=(y+2)^2.
Would this be a continuous function? i know that in this kind of equation were I to show it on a graph, x would be to plotted 2 units to the left. But what would my y coordinants be?
Click here to see answer by swincher4391(1107)

Question 661150: find the average rate of change of the function f(x)=sqrt(1-2x^2) between x=-a and x=-a+h.
Click here to see answer by solver91311(24713)

Question 661481: how to find the algebraic rule
Click here to see answer by lynnlo(4176)

Question 661736: we are stuck on a funtion table!
my daughter, husband and myself have worked WAY TO LONG on this... we've answered the other ten tables on this homework and a couple other pages worth on previous occasions. any help would be most appreciated.
here are the values given... {(0,0) (3,7) (5,9)}
thanks so much!
Click here to see answer by Alan3354(69443)

Question 661801: domain of g(x)=13/x-4
Click here to see answer by solver91311(24713)

Question 661826: what is the difference quotient for f(x)=x(squared)-5x+8
Click here to see answer by stanbon(75887)

Question 662037: {(1,-1),(0,0),(3,-3),(-2,2)} is this relation a function? Why?
Click here to see answer by MathLover1(20849)

Question 662227: Hello,
Given functions h(x)= 1/ (sqrt ( x ) ) and g(x)= x^2-4, state the domain of :
h(x)/g(x) using interval notation.
I have provided a link with the actual question.
http://puu.sh/1bFIg
Thank you for your time.
Click here to see answer by stanbon(75887)

Question 662338: what is the rule when you got a domain of 0 1 2 3
and a range of 0 0.5 2 4.5
Click here to see answer by sravanik2005(14)

Question 662437: f(x)= 10x + 7
g(x) =5
find f(g(x))
Click here to see answer by MathLover1(20849)

Question 662466: find the domain of the given function f(x)=-6x+3
Click here to see answer by lynnlo(4176)

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