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

Tutors Answer Your Questions about Functions (FREE)

Question 72432: please
if f(3/x)=2x-1
compute

Click here to see answer by psbhowmick(878)

Question 72430: please
if f(2x)=4/2+x
compute
f(x)=?
Click here to see answer by jim_thompson5910(35256)

Question 72568: The volume of a cube is given by V = s3. Find the length of a side of a cube if the Volume is 729 cm3.
Answer:
Show work in this space.

Click here to see answer by pradhyumna.kumar@gmail.com(62)

Question 72595: Please help me solve
f(5) + h (5)
if
f(x)=7x - 40
h(x)= -x^2 + 6x
Click here to see answer by bucky(2189)

Question 72596: Help me solve
g(h(15))
if
g(x)=70
h(x)= -x^2 + 6x
Click here to see answer by bucky(2189)

Question 72617: please help me solve g(-10)
if
g(x)=70
Click here to see answer by bucky(2189)

Question 72616: please help me solve h(f(6))
if
h(x)= -x^2 + 6x
f(x)= 7x - 40
Click here to see answer by bucky(2189)

Question 72622: use cramers rule to solve
2x = 7 + 3y
4x - 6y =3
Click here to see answer by bucky(2189)

Question 72618: for the function f(x)= 3x^2 + 4x-2
find f(-5) and f(0)

Click here to see answer by checkley75(3666)

Question 72615: please help me solve g(12) - g (8)

if g(x)=70
Click here to see answer by don vito(18)

Question 72614: please help me solve g(0)

if g(x)=70
Click here to see answer by don vito(18)

Question 72621:
Solve this system of equations. 3y - z = -1 x + 5y - z = -4 -3x + 6y + 2z = 11

Click here to see answer by Edwin McCravy(20054)

Question 72686: Solve the indicated variable.
Area of a Trapezoid
Solve for b1:
A= 1/2h(b1 + b2)
Click here to see answer by Earlsdon(6294)

Question 68099: 1. 3n=(6-n)(-3)
2. -10= 4- 7x/4
3. 1/4(y+8)=5
4 7.6x + 3.7= 2.8-1.6x
Click here to see answer by checkley75(3666)

Question 70557: 19.2(3.5-4.1x)=7.2(8.7x-4.9)
can you show me how to solve this equation
thank you
Click here to see answer by terbear1963(43)

Question 72717: I'm confused...help?
If f(x) = x(x + 1)(x - 4), use interval notation to give all values of x where f(x)>0.
Click here to see answer by stanbon(75887)

Question 72619: for f(x)=x^2 + 4x and g(x)= 2 - x
find (f - g)(x)
Click here to see answer by stanbon(75887)

Question 72620: solve this system of equations. if it is unsolvable say so.
3x + 4y + 5z=8
1x - 2y + 3z= -6
2x - 4y + 6z=8
Click here to see answer by bucky(2189)

Question 72707: i am trying to the
Click here to see answer by rmromero(383)

Question 72851: write in y=... form
-2(x+3y)=18
Click here to see answer by checkley75(3666)

Question 72858: please i need help with this problem find the maximum value of y= -x^2+6x
Click here to see answer by stanbon(75887)

Question 72849: write in "y=...."form
5y+3=2y-3x+5
Click here to see answer by checkley75(3666)

Question 72848: write in "y=...."form

3y-12=12x
Click here to see answer by blfaust(5)

Question 72848: write in "y=...."form

3y-12=12x
Click here to see answer by rahman(247)

Question 72923: 3)
x -2 -1 0 1 2
y .25 .5 1 2 4
Given the table above, graph the function, identify the graph of the function (line, parabola, hyperbola, or exponential), explain your choice, and give the domain and range as shown in the graph, and also the domain and range of the entire function.
Graph
Graph Type
Explanation
Domain
Range

Click here to see answer by Edwin McCravy(20054)

Question 72847: Write in "y=...." form
5x+10=10y
Click here to see answer by funmath(2933)

Question 72855: please i need help with this function f(x)=x^2+5, find f(a+h)-f(a)
Click here to see answer by stanbon(75887)

Question 72845: Write each equation as a function in "y=...."form

3y=15x-12
Click here to see answer by stanbon(75887)

Question 73149: If y varies directly as x^2, and if y=36 when x=2, find y when x=10.
Click here to see answer by psbhowmick(878)

Question 73143: x^2+y^2=16
Click here to see answer by psbhowmick(878)

Question 73159: How do I prove y+x^2-2x= -1? Thanks for any help!!
Click here to see answer by jim_thompson5910(35256)

Question 73175: If c varies inversely as d, and if c=12 when d=1/4, find c when d=9?

Click here to see answer by stanbon(75887)

Question 73245: find the domain of f(x)=7+ sqrt 3x+21
Click here to see answer by bucky(2189)

Question 73604: the degree three polynomial f(x) with real coefficients and leading ocefficient 1, has -3 and +4i among its roots, express f(x) as a product of linear and quadratic polynomials with real coefficients
Click here to see answer by ankor@dixie-net.com(22740)

Question 73727: if f(x)=x(x+1)(x-4), use interval notation to give all values of x where f(x)>0
Click here to see answer by jim_thompson5910(35256)

Question 73745: find (f of g)(7)

x 4 5 6 7 x 4 5 6 7
------------------ -----------------
f(x) 6 7 4 5 g(x) 6 5 7 4
Click here to see answer by jim_thompson5910(35256)

Question 73789: Im stumped!!! Is there an easy way to do these? Thanks so much!

Use the geometric sequence of numbers 1, 1/2, 1/4, 1/8,�to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
Show work in this space.

b) Using the formula for the sum of the first n terms of a geometric series, what is the sum of the first 10 terms? Please round your answer to 4 decimals.
Answer:
Show work in this space.

c)Using the formula for the sum of the first n terms of a geometric series, what is the sum of the first 12 terms? Please round your answer to 4 decimals.
Answer:
Show work in this space.

d) What observation can make about these sums? In particular, what whole number does it appear that the sum will always be smaller than?
Answer:

Click here to see answer by Earlsdon(6294)

Question 73855: Please help me solve this problem.
f : x 2 – x
g : x √x
a) Dapatkan domain dan julat bagi f dan g.
b) Dapatkan fungsi f o g dan nilai (fog)( 4 )
c) Dapatkan fungsi g of dan nilai ( gof) ( 2 )
d) Lakarkan graf bagi fungsi f, g, fog dan gof pada paksi yang sama

Click here to see answer by stanbon(75887)

Question 73899: If Mary was 5 times older than Mark 10 years ago and will be twice his age in 20 years. How old are they now?
I don't know how to put this into functions. Can you help me please
Click here to see answer by ankor@dixie-net.com(22740)

Question 73600: a bacteria culture started with a count of 720 at 8am and after t hours is expected to grow to f(t)=720(3/2)^t. estimate number of bacteria in culture at 11am the same day? Here is what I got f(3)=720(3/2)^3=? Am I on track?
Click here to see answer by tazoftroy(22)

Question 73946: WHAT IS THE DOMAIN OF THIS FUNCTION AND THE VERTICAL ASYMPTOTES
x^2-2x/3x^3-3x^2-6x this is what i got in lowest terms x/3x(x+1) is this right?
so will the vertical asymptotes be x=0 and x=-1?
please help me thank you:)
Click here to see answer by stanbon(75887)

Question 73985: 2) The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 100 cubic centimeters.
a) Write h as a function of r. Keep "" in the function's equation.
Answer

b) What is the measurement of the height if the radius of the cylinder is 2 centimeters? Round your answer to the nearest whole number.
Answer
Show work in this space

c) Graph this function.
Show graph here

Click here to see answer by jim_thompson5910(35256)

Question 74039:

FIND THE DOMAIN FOR ,

AND EXPRESS IT USING INTERVAL NOTATION., AND EXPRESS IT USING INTERVAL NOTATION.  


Click here to see answer by Edwin McCravy(20054)

Question 73849: Find the value of a which will ensure that the domain of the function
f(x) =3/sqrt(ax+1)
--------------------------------------------------------------------------------

is the interval (-�, 10), i.e. x < 10.

Click here to see answer by jim_thompson5910(35256)

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