# 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 57306: The ordered pairs are for the same direct variation. Find each missing value. (-1,2) and (4,y) How would you do that?? would y be 7 because the difference between -1 and 2 is 3, and 4+3=7??? Click here to see answer by funmath(2925)

 Question 57239: the period of a simple pendulum is directly proportional to the square root of it's length. if a pendulum has a length of 6ft and a period of 2 sec, to what length should it be shortened to achieve a 1 second period? Click here to see answer by aaaaaaaa(138)

 Question 57305: Direct variation: true or false If you triple an x-value of a direct variation, the y-value also triple. true of false?? Explain. I put true becausein y=kx, lets say y=2,k=1,and x=3. If the 3 is tripled, it would become 9, causing the y (or 2) become 6 and also triple. Is this correct??? Click here to see answer by funmath(2925)

 Question 57304: this question has to do with direct variation: The graph of a direct variation may pass through (-2,4) True or false. Explain I think its true because couldn't direct variations be any ordered pairs but 0?? Could I get confirmation on this? Click here to see answer by stanbon(57250)

 Question 57439: Can you help me... A) Find the average rate of change of the function f(x)= 1/x+5; x=5, x=15 b) Find the maximum or minimum value of the function f(x) = 1+5x+5x^2 Click here to see answer by stanbon(57250)

 Question 57463: Can someone please help me on the following problem? I need to evaluate this function for the value specified. f(x) = x^2 - 7x + 10; find (a) f(0), (b) f(5), and (c) f(-2). Thank you, sher Click here to see answer by rcmcc(152)

 Question 57468: Can someone help me on this problem? If f(x) = 5x - 1, Ifind the following: f(a-2) Thanks, Ashley Click here to see answer by Nate(3500)
 Question 57468: Can someone help me on this problem? If f(x) = 5x - 1, Ifind the following: f(a-2) Thanks, Ashley Click here to see answer by Earlsdon(6287)

 Question 57467: Can someone help me with this problem? If f(x) = 4x - 3, I need to find the following: f(-1) Thanks, Ashley Click here to see answer by Nate(3500)

 Question 57469: Can someone help me on this problem? If the inventor charges \$4 per unit, then her profit for producing and selling x units is given by the function: P(x) = 2.25x - 7000 (a) What is her profit if she sells 2000 units? (b) What is her profit if she sells 5000 units? (c) What is the break-even point for sales? Thanks, Ashley Click here to see answer by Nate(3500)

 Question 57465: Can someone help me on this problem? I need to rewrite the following equation as a function of x. -3x + 4y = 11 Thank you, Ashley Click here to see answer by Nate(3500)
 Question 57465: Can someone help me on this problem? I need to rewrite the following equation as a function of x. -3x + 4y = 11 Thank you, Ashley Click here to see answer by rcmcc(152)

 Question 57476: 1). If f(x) =2x2+1 and g(x)=x-3, find (f o g)(x). a. (f o g)(x) = 2x 2 - 17 b. (f o g)(x) = 2x 2 - 12x + 19 c. (f o g)(x) = 2x 2 - 2 d. (f o g)(x) = 2x 2 - 12x + 13 2). Is the graph of y=x2+5 symmetric with respect to the origin, the x-axis, the y-axis, or the line y = x? a. the x-axis b. the y-axis c. the origin d. the line y = x Click here to see answer by funmath(2925)

 Question 57593: My question is not in my book, it is on a hand out. The question is...... find the slope and y-intercept of the line given by 2x-3y=5 I came up with y=-2/3x+5....is this the correctanswer -2/3;(0,-5/3) Click here to see answer by stanbon(57250)

 Question 57657: Determine whether the following functions are inverse. f(x) = (8x+9)/8 g(x) = (10x-7)/8 I am unable to solve. Click here to see answer by funmath(2925)

 Question 57656: Determine whether the following functions are inverse. f(x) = (8x+9)/8 g(x) = (10x-7)/8 I am unable to solve. Click here to see answer by hayek(51)

 Question 57731: The question says find the domain of (-2,-1,0,2,5) 1.y=3x+2 does that mean replace x with each of the numbers in parenthasis? Wouldn't that be solving for x? Can domains be negative? How would you express the answer? In parenthasis with each answer seperated by a comma? Click here to see answer by stanbon(57250)

 Question 57796: Form a polynomial whose zeros and degree are given. Zeros: 0, -3, 2 Degree: 3 Click here to see answer by Cintchr(481)

 Question 57798: For the polynomial, list each real zero and its multiplicity. Determine whether the graph crosses or touches the x-axis at each x-intercept. f(x) = (x + 1/5)^2(x^2 + 5)^3 Click here to see answer by stanbon(57250)

 Question 57793: Given f(x)=(x+1)^2(x-1)(x+2)(x+4)^3 a.) Find the x- and y- intercepts of f. b.) Determine whether the graph touches or crosses the x-axis at each x-intercept. How do you do this without graphing f? c.) What power function does f resemble for very large values of |x|? Click here to see answer by stanbon(57250)

 Question 57794: Determine the domain and range of the function -x^2 + 6x - 8. Click here to see answer by funmath(2925)

 Question 57795: The owner of a video store has determined that the cost C, in dollars, of operating the store is approximately given by C(x) = 2x^2 - 28x + 560, where x is the number of videos rented daily. Find the lowest cost to the nearest dollar. Click here to see answer by phillv(13)

 Question 57880: Can someone help me on this problem? I need to evaluate the function on this problem for the value specified. f(x) = x^2 - 7x + 10; find (a) f(0), (b) f(5), and (c) f(-2). Thanks so much, Sher Click here to see answer by funmath(2925)
 Question 57880: Can someone help me on this problem? I need to evaluate the function on this problem for the value specified. f(x) = x^2 - 7x + 10; find (a) f(0), (b) f(5), and (c) f(-2). Thanks so much, Sher Click here to see answer by rcmcc(152)

 Question 58000: Can someone help me on this problem? I need to rewrite the following equation as a function of x. -3x + 4y = 11 Thanks so much, Sher Click here to see answer by rcmcc(152)

 Question 58009: Determine the domain and the range of the function f(x) = x^2 - 12x + 36 Click here to see answer by rcmcc(152)

 Question 58010: Determine where the function is increasing and where it is decreasing. f(x) = 4x^2 - x - 3 Click here to see answer by venugopalramana(3286)

 Question 58058: rewrite 3x+4y=15+6y so that y is a funtion of x Click here to see answer by rcmcc(152)
 Question 58058: rewrite 3x+4y=15+6y so that y is a funtion of x Click here to see answer by Earlsdon(6287)
 Question 58058: rewrite 3x+4y=15+6y so that y is a funtion of x Click here to see answer by tutorcecilia(2152)

 Question 58233: if f (x) = 5x - 1, find the following: f (a - 2) Click here to see answer by funmath(2925)

 Question 58229: f (x) = x2 - 7x + 10; find (a) f (0), (b) f (5), and (c) f (-2). evaluate each function for the value specified please. Thank you :) Click here to see answer by funmath(2925)

 Question 58238: State the degree of the following polynomial: 8x^3 + 6x^2y + 4xy^3 - 2y^4 Click here to see answer by funmath(2925)