Tutors Answer Your Questions about Functions (FREE)
Question 13342: I seem to be stumped on this, your help would be appreciated.
Thank you.
What is the domain of the following equation? 3x-7y=13
with one of these solutions:
1. Set of real numbers
2. 7/3
3. All positive real numbers or
4. No real numbers
Click here to see answer by rapaljer(4671)   |
Question 13407: Your assistance on this is appreciated.
Over what interval is the following piecewise function increasing?
f(x)=
{-1-x for x<-2
{3x+7 for -2<=x<=-1
{1 for x>-1
choices of answers are (-inf.,-2),[-2,-1],(-1,inf.), the function is not increasing over any range, or none of the above.
Click here to see answer by rapaljer(4671) |
Question 12897: Please help me figure out how to do the function thing. I dont understand the Domain numbers and where to put them. the function is:  and the domain numbers are: (-3, 0,1.2,5) Thank You Amber
Click here to see answer by Howdie(1) |
Question 14979: I need to develop a function that represents the following conditions:
A car was purchased for $22,500. The value of the car decreases by $3200 per year for the first six years. Write a function that describes the value of the car, V, after x years, where x is greater than or equal to 0 but less than or equal to 7. Then find and interpret V(3).
V(x)=22,500-3200(x)
v(3)=22,500-3200(3)
That would be my best guess. Thanks for your help!
Click here to see answer by rapaljer(4671) |
Question 15349: In reference to Inverse Functions: How do you determine when to use the "short cut" method when trying to find the inverse of a function? For example, f(x) y = (x3+8)/3 so, we cubed it, added 8, and then divided by 3. If you undo it in reverse order (multiply 3, minus 8, cube root) it becomes the inverse.  Why won't this work on all the problems? Thank you in advance!
Click here to see answer by khwang(438) |
Question 15349: In reference to Inverse Functions: How do you determine when to use the "short cut" method when trying to find the inverse of a function? For example, f(x) y = (x3+8)/3 so, we cubed it, added 8, and then divided by 3. If you undo it in reverse order (multiply 3, minus 8, cube root) it becomes the inverse. Why won't this work on all the problems? Thank you in advance!
Click here to see answer by rapaljer(4671) |
Question 14733: problem:
(you have to use an equation to solve the problem)
the attendance at the ball game was 400 people. student tickets cost $2 and adult tickets cost $3. if $1050 was collected in ticket sales, how many of each type of ticket were sold?
Click here to see answer by LilSkittleMd(119) |
Question 16460: Rewriting an Equation in Function Form. The certain topic would be rewriting the equation so that y is a function of x, here is the question. 1/4y+3=-5x Now keep in mind that my teacher demands that every evidince of how we solved this is showed please send the work as well if I see and example problem and study off it more thoroughly I might become accustomed to this.
Sincerely,
Jeremiah.
Click here to see answer by Earlsdon(6294) |
Question 16693: Please help with the following:
If g(x) = x ^2 - 3x, find what the square root of (g(-1) ) is.
I started with:
the square root of g times -1 = the square root of 1^2 - 3 times the square root of -1
the square root of g times -1 = 1- 3, times the square root of -1
the square root of g times -1 = -2, times the square root of -1
the teacher's answer is 2 and I'm not sure how he got it and if it would be
"the square root of g times -1" = 2.
Please help!
Click here to see answer by bam878s(77) |
Question 16720: Please help me with the following:
Find the indicated difference quotient and simplify answer:
Given f(x) = 5x + 3
find f(x) f(2) over x-2
what I tried:
1. f(x) = 5x+3
2. f(x) - f(2) = 5x + 3 - 5x + 3(2) = 9
3. f(x) - f(2) over x-2 = 9 over 5x + 3-2 = 9 over 5x + 1
Unfortunately this does not come close to the teacher's answer of 5.
Can you please tell me what I'm doing wrong?
Thanks
Sandy
Click here to see answer by bam878s(77) |
Question 16724: Please help with this problem:
Find the indicated difference quotient and simplify answer.
Given f(x) = x^2 = 5x + 1
find f(5 + h) - f(5) over h
what I did:
1. f(5+h) = (5+h)^2 + 5(5+h) +1
=(5+h)(5+h) + 5(5+h) +1
=25 +5h +5h +h^2 +25 +5h + 1
=51 + 15h +h^2
2. f(5+h) - f(5) = 51 + 15h + h^2 - 5^2 + 5(5) + 1
= 51 + 15h + h^2 - 25 + 25 + 1
= 52 + 15h + h2
3. f(5+h) - f(5) over h = 52 + 15h + h^2 over h
The teacher's answer is 15 + h
Where did I go wrong?
Please help!
Thanks,
Sandy
Click here to see answer by rapaljer(4671) |
Question 17180: Reduce Rational Expression to lowest terms
x2 - 4
------------
2x2 + 8x + 8
the x is squared and the 2x is also squared
I know that verything is supposed to be factored first but I don't know what to do after that.
Click here to see answer by Earlsdon(6294) |
Question 18346: A set of children's blocks contains 3 shapes: Longs, flats & cubes
There are 3 times as many longs as cubes and 30 fewer flats than longs. If there are 600 blocks in all, how many longs are there?
Click here to see answer by pwac(253) |
Question 19206: I am not sure what this is called but could you show me how to work it out step by step? I would be greatful. Solve F = 9C + 160 for C
________
5
I tried to figure it out but I am not getting the answer the book shows. The line & 5 is supposed to be underneath9C + 160
Thanks in advance
Click here to see answer by wuwei96815(245) |
Question 19206: I am not sure what this is called but could you show me how to work it out step by step? I would be greatful. Solve F = 9C + 160 for C
________
5
I tried to figure it out but I am not getting the answer the book shows. The line & 5 is supposed to be underneath9C + 160
Thanks in advance
Click here to see answer by celeste(1) |
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