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

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Question 59299: if f(x) =2x+5 find the following.
f(-4)
f(3)-5
Click here to see answer by funmath(2933)

Question 59471: Can someone please provide me with an example of a composite function step by step solution
Click here to see answer by funmath(2933)

Question 59645: What is the difference between a dependant and an independant varible? And how do you determine the domain and the range of a function?
the following equation y=3x+2
Which is the domain of each and how would I determine it.
I have to explain this but I have no glue, this is new to me and I need some help. thank you
Click here to see answer by funmath(2933)

Question 59493: how to graph a function
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Question 59699: How do you evalute f(x)=x^2-6/3x; f(n-3)?
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Question 60014: what is the domain of this y=2x-1
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Question 60145: s=l-rl Solve for r
Click here to see answer by checkley71(8403)

Question 60208: |(3,1),(2,5),(4,0),(3,-2)|
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Question 60235: Find the domain of the composite function f � g.
f(x)=1/(x+10); g(x)= x+5
Click here to see answer by uma(370)

Question 60238: If the function defines a one-to-one function, find the inverse.
f(x) = (x+2)^3 - 8
Click here to see answer by uma(370)

Question 60237: Find the inverse function of f. State the domain and range of f.
f(x) = (3x-2)/(x+5)
Click here to see answer by funmath(2933)

Question 60236: Find the functions f and g so that the composition of f and g is H.
H(x)=cuberoot(x+1)
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Question 60135: 2x=-3y+10
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Question 60298: 12x-2y=13
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Question 60240: Decide whether or not the functions are inverses of each other.
f(x)=(x-4)^2, x≥4; g(x)= sqrt(x+4)
Click here to see answer by funmath(2933)

Question 59515: S. Bones is the doctor in Deathly, Ill., a suburb of Chicago. One day, John Garfinkle comes in with a high fever. Dr. Bones takes a blood sample and finds that it contains 1300 flu viruses per cubic millimeter and is increasing. John immediately gets a shot pf penicillin. The virus count should continue to increase for a while, then (hopefully!) level off and go back down. After 5 minutes the virus count is up to 1875, and after 5 more minutes, it is 2400. Assume the virus count varies quadratically with the number of minutes since the shot.
Find the equation expressing the number of viruses per cubic millimeter in terms of the number of minutes since the shot. Be sure to define your variables, set up a system of equations and use matrices to solve. Show all steps.
Click here to see answer by hayek(51)

Question 60306: y/5 -7=2x
Click here to see answer by tutorcecilia(2152)

Question 60327: Please,may someone help me on these directions?Or at lest help me understand them? I would appreciate it very much! Okay here it goes:
EVALUATING FUNCTIONS-Eveluate the function when x=2,x=0 and x=-3.
Example:
f(x)=10x + 1
or
g(x)=2/3x=7

Click here to see answer by tutorcecilia(2152)

Question 60523: 2-y/6=8x
Click here to see answer by kayeith(17)

Question 60674: -3x+4y-5=-14 rewrite the equation so that y is a function of x
Click here to see answer by checkley71(8403)

Question 60606: r+6/5 = r+8/7
Click here to see answer by praseena(37)

Question 60695: What is the domain for (2, 4) (3, 9) (-2, 4) (-3, 9)

Click here to see answer by funmath(2933)

Question 60678: Is the folowing an example of a function: Explain why or why not
(2, 4) (3, 9) (-2, 4) (-3, 9)

Click here to see answer by funmath(2933)

Question 60624: please help!
Find the domain of y = x + 3 if the range is, (-1,1,3,5)
Click here to see answer by brandonpark2889(31)

Question 60745: Domain, Range
2 , 4
3 , 9
-2 , 4
-3 , 9
How do I find the function formula to create this table?
Click here to see answer by mszlmb(115)

Question 60769: Find the domain of y = x+ 3 if the range is (-1,1,3,5)
PLEASE HELP!
Click here to see answer by mszlmb(115)

Question 60797: Given f(x) = �2x + 4, find f(a � 2).
Click here to see answer by funmath(2933)

Question 60795: Rewrite the equation 4x � 10y = 11 as a function of x.

Click here to see answer by checkley71(8403)

Question 60795: Rewrite the equation 4x � 10y = 11 as a function of x.

Click here to see answer by funmath(2933)

Question 60995: given that. f: 3x^2-4x+1 g: 2x-1 calculate fg(10)
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Question 61022: I can't seem to find the function rule for this set of data:
x y
-2 -2
0 1
2 4
4 7
Click here to see answer by funmath(2933)

Question 61053: How do u do this question: Solve for "r" in the formula: S=L-rL
Click here to see answer by joyofmath(189)

Question 61131: y=2xsquared-8x. Find the y-intercepts and any x-intercepts.
Click here to see answer by jai_kos(139)

Question 61131: y=2xsquared-8x. Find the y-intercepts and any x-intercepts.
Click here to see answer by funmath(2933)

Question 61130: f(x)=square root of x+2, g(x)=8x-6. Find (f*g)(x)
Click here to see answer by tutorcecilia(2152)

Question 61245: Please, Please, PLEASE I REALLY need help on these 2 problems.
f(x)=2x^3+7x^2+x+3, use the rational zeros theorem to find and list all the possible values of p/q.
Given the equation P(x)=2x^3+7x^2+x+3 how many variations of sign are there, in the sense of Descartes' rule of signs? What is the number of positive real zeros of P(x)?
If anyone has the time and feels like helping, thanks in advance.
Click here to see answer by funmath(2933)

Question 61368: I want to make sure i am doing this correctly... Question is: Determine ALL REAL ZEROS (and multiplicities for them) for the following polynomial functions.
f(x)=x^4-6x^3+13x^2-24x+36
I went to the tutor here at school, and it seemed like the kid did not know what the correct answer would be... I have..
Real Zeros= x=3
but i don't think i am right.. Please help.. Thanks again..

Click here to see answer by stanbon(75887)

Question 61499: If 2^-x = 5, then what does 2^2x equal? Express your answer in exact form.
Click here to see answer by josmiceli(19441)

Question 61502: How do I find f(0), f(3) and f(-5) for the following functions:
a) f(x) = 7 � 2x

b) f(x) = x2 + x
I first substituted each number for x in question a I got :
when x is 0, y = 3.5
when x is 3, y = 2
when x is 5, y = 1
Question b was more hard for me but i stuck it through and these are my answers:
when x is 0, y = 0
when x is 3, y = 1.307
when x is 5, y = 1.781
I am NOT sure of these answers...Please help!!

Click here to see answer by kapilsinghi(68)

Question 61475: Solve, expressing answer in exact form.
[(e^x)^3 * (e^x)^2x] / e^5 = 1
Click here to see answer by joyofmath(189)

Question 61526: For the function f(x)=x^2-2x+1
(a)find f(0)

(b)solve f(x)=0
Click here to see answer by tutorcecilia(2152)

Question 61571: The Kenetic energy of mass M is found by taking one half of the product of the mass M and the square of the volicity V write expression for the kinetic energy of a partial.
Click here to see answer by stanbon(75887)

Question 61573: 5+(6+7)=5+(7+6) Identify the property that is used.
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Question 61570: It is estimated that the earth is looseing 4000 species of plants and animals a year if S represents the number of species living last year how many species are on earth this year?
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Question 61567: The sum of M and N devided by the didderences of M and n
Click here to see answer by terbear1963(43)

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