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

Tutors Answer Your Questions about Functions (FREE)

Question 532597: what is the domain and range of the function f(x)=sqrt(x-7)
Click here to see answer by stanbon(57290)

Question 532688: state the domain of f(x)=3x-5
Click here to see answer by stanbon(57290)

Question 532673: Q varies directly as x and inversely as a square root of y and if Q=14.70 when x=-6 and y=6 find Q when x=7 and y=10. Round to the nearest hundreth. I have no idea how to begin to complete this.
Click here to see answer by lwsshak3(6490)

Question 533051: I need to solve this by substitution
y=2x+3
y=4x-1
Click here to see answer by oberobic(2304)

Question 533206: I am not understanding these Adavanced Functions and could use some help please.
f(x)=-3x-3 and g(x)=x^2+2x find (f-g)(2)
Click here to see answer by stanbon(57290)

Question 533206: I am not understanding these Adavanced Functions and could use some help please.
f(x)=-3x-3 and g(x)=x^2+2x find (f-g)(2)
Click here to see answer by KMST(1868)

Question 533327: Let f(x)=x-7/x+5 and g(x)=x+3/x-4
f(x)=g(x)
I am stumped and maybe if i got the answer it could help me learn the process.
Click here to see answer by Alan3354(30993)

Question 533657: this is a word problom from my college algebra I book that deals with Inverse Functions: "John owns a hotdog stand. He has found that his profit is represented by the equation P=-x^2+56x+77, with P being profits and x the number of hotdogs. How many hotdogs must he sell to earn the most profit? What will be his maximum profit?"
Click here to see answer by Earlsdon(6287)

Question 533724:
Click here to see answer by fcabanski(874)

Question 534620: a patio should drop between one-eighth and one-fourth inch for each foot away from the house. what should the total drop be for a patio at a point 20 feet from the house?
Click here to see answer by solver91311(16877)

Question 534751: Find the equation for the tangent line to the curve y= f(x) where through the point (1, -3) where f(x)= x^8- 4x
Click here to see answer by Alan3354(30993)

Question 534799: Identify all Maximums Points, Minimum Points, and Points of Inflections for the function (x+3)/(x^2-16).
-----------------------------
I am not sure. I am thinking that ff there is no point at which the first derivative is equal to 0, then it is impossible for there to be a point at which both the second and first derivative are equal to 0, making the answer for all three points (Maximum, Minimum, and Points of Inflection) none.
My domain is all values of x except x=-2 & x=2. My range is (-infinity, infinity).
Thank you! :)
Click here to see answer by KMST(1868)

Question 534968: find an equation of the line satisfying the conditions given. Express your answer in standard form.
parallel to 5x-y=4 and passing through (-2, 0)
Click here to see answer by mananth(12270)

Question 535082: could you please fill in the blank for me, 1,5,13,25,_,61,85
Click here to see answer by Iluvidina(15)

Question 535081: if a recipe calls for 7 cups of rice and you use a half of teaspoon of salt per cup, how much salt would you use?
Click here to see answer by josmiceli(9668)

Question 535238: what is the domain? 2x/x(X-64)
Click here to see answer by KMST(1868)

Question 535275: find value, f(-1)

Click here to see answer by Alan3354(30993)

Question 535330: How do you find f(x+h) for this function: f(x)=x^2-2x+5. I know you pug in (x+h0 for x.. but i don't understand how to solve it. If you could please help me that'd be great. :)
Click here to see answer by stanbon(57290)

Question 535398: Without graphing, determine the vertex of the given parabola:
y = -3x^2 - 6x - 8
Click here to see answer by rfer(12657)

Question 535398: Without graphing, determine the vertex of the given parabola:
y = -3x^2 - 6x - 8
Click here to see answer by oberobic(2304)

Question 535395: Without graphing, determine the vertex of the given parabola:
g(x) = x^2 + 16x - 3
Click here to see answer by rfer(12657)

Question 535531: what is the impilied domain of the givin function? g(x)=5x^2+3x+2
Click here to see answer by fcabanski(874)

Question 535051: Find the value of f(2) when f,g are differentiable functions such that (fg)′(x) = f(x)g′(x), g(x)<0, for all x, while f(0) = 4
Click here to see answer by richard1234(5390)

Question 536295: Find the average rate of change for
f(x) = 3x + x from 1 and 2 and the equation of the secant line containing (1, f(1)) and (2, f(2)). I'm not understanding the secant line. Could someone please explain this to me?
Click here to see answer by fcabanski(874)

Question 536412: what is the domain and range of f(x)=10-x^2
Click here to see answer by fcabanski(874)

Question 536333: Let f(x) = x – 2 and g(x) = 3x + 4. What is f(g(x)) ?
and
What is the quotient: (–10x3 – 5x2 + 15x) ÷ 5x ?
Click here to see answer by Earlsdon(6287)

Question 536572: what is the function rule for the graph:
x y
1 20
2 16
3 12
4 8
?
Click here to see answer by jim_thompson5910(28548)

Question 536554: I asked this question earlier, but I mistyped so the person was unable to give the help that I needed. The question goes as follows:
Find the average rate of change for f(x) = x^3 + x from 1 and 2 and the equation of the secant line containing (1, f(1)) and (2, (2)). I appreciate your time.
Click here to see answer by solver91311(16877)

Question 536557: Find the function
f(x) = 1/x, Shift left 1 unit, shift up 3 units, reflect about the y-axis. I am completely lost with this question. Would someone please explain?

Click here to see answer by KMST(1868)

Question 537380: 7x+4=5x+5 type an integer or a fraction
Click here to see answer by algebrahouse.com(1079)

Question 537382: -8
___ find the decimal notation for the fraction
7
Click here to see answer by jim_thompson5910(28548)

Question 537382: -8
___ find the decimal notation for the fraction
7
Click here to see answer by fcabanski(874)

Question 537733: Find the Domain of y = x^3-6x^2+10
Click here to see answer by jim_thompson5910(28548)

Question 537758: what is the vertical intercept of p(t)=54.25-2/7t
Click here to see answer by solver91311(16877)

Question 537893: If f(x)=4x-5 find f(3a+1) please help and demostrate details please.and explain to me whats function is. (im in 8th grade and learning algebra.)
Click here to see answer by solver91311(16877)

Question 538280: What similarities and differences do you see between functions and linear equations? Are all linear equations functions? Is there an instance in which a linear equation is not a function? Support your answer. Create an equation of a nonlinear function and provide two inputs
Click here to see answer by richard1234(5390)

Question 538929: what is the next term in a geometric sequence 16,14,1,1/4....?

Click here to see answer by fcabanski(874)

Question 539143: f(x)=1/7x compute the difference
Click here to see answer by Alan3354(30993)

Question 539276: What is the domain of the equation y=4x-3
Click here to see answer by stanbon(57290)

Question 539498: What is the function of (0,1),(1,.5),(2,.25),(3,.125),(4,.0625)

Click here to see answer by Alan3354(30993)

Question 539569: What is f(2) for the function f(x)=4x+1 ?
Click here to see answer by jim_thompson5910(28548)

Question 539786: Given the following quadratic equation, determine if it has a maximum or a minimum value. Then find the maximum or minimum value.
f(x)=4x^2 + 2x - 9
Click here to see answer by KMST(1868)

Question 539863: I am really struggling with algebra of functions and algebraic composition. I dont understand how to get the the answers
Example:
f(x)=x/2 h(x)=2x^2
(hof)(x)=?
Click here to see answer by Earlsdon(6287)

Question 540463: find the value of m if (-2,0) and (4,m) are coordinates of twp points on a straight line whoae slope is 5/6
Click here to see answer by mananth(12270)

Question 540835: Determine the quadratic function, f(x) = ax^2 + bx + c, whose vertex is (1, 8) and passes through the point (-3, 4)
Click here to see answer by AnlytcPhil(1276)

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