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

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 Algebra: Functions, Domain, NOT graphing Solvers Lessons Answers archive Quiz In Depth

 Question 394857: what is the domain of the function: squareroot(5-X)/(x^2+8x-9) Click here to see answer by stanbon(57962)

 Question 394871: Suppose you are given the two functions f(x)=4sqrt(x)+2 g(x)=x^2+3 Determine the expression g*f(x) = g(f(x)) Click here to see answer by edjones(7569)

 Question 395007: 1 Write the area of a square, A, as a function of its side, x. Click here to see answer by ewatrrr(10682)

 Question 395012: 7- Express the distance d traveled at 50 mi/h as a function of t (in hours). Click here to see answer by Alan3354(31515)

 Question 395009: 6- The cost of running a manufacturing plant is \$10,000 per day plus \$20 for each unit produced. Write the daily cost C as a function of x, the number of units produced. Click here to see answer by ewatrrr(10682)

 Question 395032: Find the difference quotient f(x+h)-f(x)/h, where h cannot be equal to 0 , for the function below. f(x)=2x^2-x Simplify your answer as much as possible Click here to see answer by stanbon(57962)

 Question 394207: A certain function f has the property that f(x + y) = f(x) + f(y) for all values of x and y . which of the following statements must be true when a = b ? I f(a + b) = 2 f(a) II f(a + b) = [f(a)]^2 III f(b)+ f(b) = f(2a) (A) none (B) I only (C) I and III only (D) II and III only (E) I II, and III Click here to see answer by robertb(4012)

 Question 395204: determine whether f(x) = (x^2)/((x^2)-4) is continuous or not at x=2. give your reason Click here to see answer by robertb(4012)

 Question 395449: okay my teacher aske me to take an equation and first solve for y then rewrite it in function notation then find the intercepts. the equation im solving is : 2x-8y=12 heres what i did but there is no answer key to check my work if im even doing it right. 2x-8y=12 let x represent 0 "i just chose any # for this"? = 2(0)-8y=12 = -8y/-8y=12/-8y = y=-1.5 so to put it into function notation would it be {f(0)=-1.5}? thats the part im confused about.. Click here to see answer by rfer(12729)

 Question 393300: Which of the following relations is a function? A. {(-4, 3), (-4, 2), (1, 9), (6, 7)} B. {(-4, 3), (-2, 0), (2, 7), (3, 9)} C. {(2, 1), (4, 2), (2, 3), (8, 4)} D. {(0, 0), (0, 1), (2, 3), (4, 5)} Click here to see answer by danieleggleton26@yahoo.com(2)

 Question 395658: I would greatly appreciate any help with this problem! Find f(g(x)) and g(f(x)) and determine if f and g are inverses. f(x)= 2/x-5 g(x)= 2/x +5 Thank you very much! Click here to see answer by solver91311(17077)

 Question 396108: Use the equation 12x-2y=16 to answer the following: A)Write the equation in slope-intercept form. B)Identify the slope of the equation. C)Identify the y-intercept. Click here to see answer by Alan3354(31515)

 Question 396156: 12x^2-5x=3 how do u solve this equation by factoring? Click here to see answer by nerdybill(7003)

 Question 396155: 24x^2-15=2x how do u solve this equation using a function? Click here to see answer by richard1234(5390)

 Question 396613: I need to graph this function rule, but I have no idea how to make a table of values with a fraction in it? y = 3/4x + 2 Click here to see answer by Alan3354(31515)

 Question 396635: Hello, What about if I know some values for x and y and I want the function? Example: I want to build a curve, arc segment; and I know that when: x=1 y=2 x=2 y=1 We could say y = 3-x, but that isn't a curve. So, how do I get the curve? Thanks for the attention! Click here to see answer by Alan3354(31515)

 Question 396780: I am being told to verify that a function is the inverse of function The first step reads "The function notation f(x) can be rewritten as____________. Choose x or y." Then we are to "Rewrite the equation you wrote in Step One with the variables reversed. Solve for y." Click here to see answer by solver91311(17077)
 Question 396780: I am being told to verify that a function is the inverse of function The first step reads "The function notation f(x) can be rewritten as____________. Choose x or y." Then we are to "Rewrite the equation you wrote in Step One with the variables reversed. Solve for y." Click here to see answer by MathLover1(6810)

 Question 396938: For each pair of functions f and g below, find f(g(x)) and g(f(x)). Then, determine whether f and g are inverses of each other. f(x)= 2/x, x is not equal to 0 g(x)= 2/x, x is not equal to 0 f(g(x))= g(f(x))= Are they inverses of each other? Thanks Click here to see answer by stanbon(57962)

 Question 396562: f(x)=3x^2-2x f(0)=3(0)^2-2(0)=0 likewise for f-(-1), let x=-1 f(-1)=5 i don't undestand how they came up with 5 finally (2)=2(2)^2-2(2)=8 Click here to see answer by richard1234(5390)

 Question 397243: I help on: give an example of at least 4 ordered pairs that does not model a function. thank you for your help. Click here to see answer by stanbon(57962)

 Question 397332: Find the intersection of the line through the points (7,10) and (4,2) with the line y=x. The point of intersection is (A,B) where A=? and B=? Click here to see answer by ewatrrr(10682)
 Question 397332: Find the intersection of the line through the points (7,10) and (4,2) with the line y=x. The point of intersection is (A,B) where A=? and B=? Click here to see answer by MathLover1(6810)

 Question 397906: Given the function f(x)=1/3x, find the value of f(-6) Click here to see answer by MathLover1(6810)

 Question 397870: I did the following problem, but I am not certain I did it correctly. I am hoping a tutor can double check this for me, and put me on the right path if it is wrong. Any help would be greatly appreciated! Here is the problem: Find f^-1(x) f(x)= (2x-3)/(x+1) Here's how I did it: f(x)=2x-3/(x+1) y=2x-3/(x+1) x=(2y-3)/(y+1) xy= (2y-3)/(y+1)*y xy= 2y-3 xy-2y=-3 y(x-2)/(x-2)=-3/(x-2) y=-3/(x-2) so f^-1(x)= -3/(x-2) Ok...Is this correct, or do I need to go back to the drawing board? Could someone please show me how to check these? Thank you! Click here to see answer by Alan3354(31515)

 Question 398046: What is the domain of the function: sqrt(x(x-7)). Write the answer in interval notation. Click here to see answer by dnanos(83)

 Question 398183: Find the slope and the y-intercept of the line. Write fractional answers in lowest terms. 6y+3x+3=5+3x The slope is_______________ The y-intercept is ______________ Click here to see answer by ewatrrr(10682)

 Question 398180: find an equation of the line having the given slope and containing the given point. m=-2,(3,6) Click here to see answer by nerdybill(7003)

 Question 398197: Express the given function as a composite of functions f and g such that y= f(g(x). y=(-9x+3)^7 Click here to see answer by stanbon(57962)

 Question 398217: what is the domain and range of [(-6,5), (4,8), (9.3)] Click here to see answer by stanbon(57962)

 Question 398186: Write an equation of the line containing the given point and parallel to the given line. The equation of the line is y=_____________. (Simplify your answer. Type answer in the form y=mx+b using integers or fractions. Click here to see answer by Alan3354(31515)

 Question 398847: Multiply the number of minutes Mr. Frotout spent on long-distance calls by \$0.45, the long-distance rate. Then add \$33, the flat monthly charge. Click here to see answer by checkley79(3056)

 Question 399415: The polynomial function f is defined by f(x)x^4-3x^3-2x^2+4x+5. Use a graphing calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth Click here to see answer by stanbon(57962)