Tutors Answer Your Questions about Functions (FREE)
Question 29439: I have been working on this problem for two weeks and still have not gotten it right. The problem is x^2+x<12 I have to solve it and then check it to make sure that I have it right. No matter how I've done it, it has been wrong. HELP!
Click here to see answer by Bb(19) 
Question 28035: 40A firm packages and ships 1pound jars of instant coffee. The cost C of shipping is 40 cents for the first pound and 25 cents for each additional pound.
Write C as a funciton of the weight w in punds for 0 less than w less than or equal to 30.
Click here to see answer by stanbon(69061) 
Question 30251: Is each a function? Explain
1. {(1,9), (9,1), (1,8), (9,1)}
2. {(2,5), (2,4), (3,8), (2,7), (1,4)}
Click here to see answer by mukhopadhyay(490) 
Question 31012: Hello:
I am having some trouble with this problem:
x^3+8x^2+11x20
I am to find all real zeros using DeCartes' Rule of Signs and Rational Zeros Theorem. My instructor never explained the Rule of Signs, and I don't understand it very well in the book. I have figured out p/q, but is there a way to find the zeros without plugging them into the f(x) individually?
Thanks,
Brad Olson
Click here to see answer by venugopalramana(3286) 
Question 31282: For the function y =
1
————
x  1
Give the y values for x = 2, 1, 0, 1, 2, 3
Im not sure if i did this right
x 2, 1, 0, 1, 2, 3
y 1.5, 2, ?, 0, .5, .6
Click here to see answer by troyapplehelen(46) 
Question 31416: I've been trying to solve this problem for awhile but I keep messing up because of the fraction in it.
Given the functions f(x)= 4/x^2 and g(x)= 32x find
a: the domain of f, g, f+g, fg, fg, and f/g
b: (f+g)(x)
c: (fg)(x)
d: (fg)(x)
e: (f/g)(x)
f: f(g(x))
g: g(f(x))
I know this seems to be a lot but I really have been stuck and its all part of the same question.
I think I have (fg)(x), I got 4/4x^212x+9 ,and I got 4/x^22x+3 for (f+g)(x),but I'm not sure if these are correct.
Click here to see answer by stanbon(69061) 
Question 31418: I'm not sure if I've put this in the right section but here it goes.
State whether each of the following is true or false.
A: The product of two odd functions is odd.
B: The sum of two even functions is even.
C: The product of an even function and an odd function is odd.
I think that the answers are false, true, and true, but I'm not certain, help would be appreciated.
Click here to see answer by stanbon(69061) 

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