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

Tutors Answer Your Questions about Functions (FREE)

Question 772634: Heyy there. Plz help me with this problem for the Sat's.
If y is inversely proportional to x and directly proportional to z, and x=4 and z=8 when y=10, what is the value of x+z when y=20?
Click here to see answer by stanbon(75887)

Question 772807: f(x)=4/x+5
Find the vertical asymptote
Click here to see answer by lwsshak3(11628)

Question 772919: I need help solving these types of problems: The domain is all positive integers less than 10, the range is 3 times x, where x is a member of the domain.
I need to write the equations and make a table of values. I always get stuck on word problems. I don't know were to start. Can you help me? Thank you!
Click here to see answer by stanbon(75887)

Question 772985: Y=3 (x+5) (x-2) which of the following formulas is equivalent to this one? Y=3x2+9x-30, or y=x2+3x-10, or y=3x2+3x-10, or y=3x2+3x-30
Click here to see answer by jim_thompson5910(35256)

Question 773203: what is the domain of f(x)=1-2x^2
Click here to see answer by stanbon(75887)

Question 773202: solve f(x) = 4x -3 for x?
Then answer which variable is dependent and which is independent?
Click here to see answer by stanbon(75887)

Question 773201: Modeling with Functions
A company uses two different-sized trucks to deliver sand. The first truck can transport (x) cubic yards, and the second (y) cubic yards. The first truck makes (S) trips to a job site, while the second makes (T) trips. What quantities do the following expressions represent in terms of the problem's context?
a. S+T
b. x+y
c. xS+yT
d. xS+yT / S+T
Click here to see answer by Edwin McCravy(20054)

Question 773423: Given f(x) = -20 − 2x, find a number, c, in the domain such that f(c) = -14. Write the corresponding ordered pair of the function.
c =
ordered pair (x, y) = ( , )

Click here to see answer by jim_thompson5910(35256)

Question 773404: What is the domain and what are the zero(s) of the this function : (9x^(3)-4x)/((x-3)(x^(2)-2x+1))
I have tried long division, simplifying it, and rearranging the equation. I can't find any zero(s) or the domain. Please help!
Click here to see answer by josgarithmetic(39613)

Question 773594: How do you determine the domain of f(x)=(x-1)(x+4) ? Thank you!
Click here to see answer by stanbon(75887)

Question 773469: What is the domain of n^2+13n+40/8n
Click here to see answer by tommyt3rd(5050)

Question 773726: How do you find the domain of ? Thank you!! :)
Click here to see answer by trx1150(14)

Question 773728: Please help me with this question:
Let f(x)=3-2x and g(x)=sqrt(x) and h(x)=3x^2+2
Find (f+h)(5)
Thank you very much! :)
Click here to see answer by tommyt3rd(5050)

Question 773846: what line is perpedincular to the line y=2/3x+3?
please help me solve this question or show me the process of finding an answer!
thank you

Click here to see answer by Alan3354(69443)

Question 773878: For f(x)= 1/x^2 find (f(x+h)-f(x))/h
I don't understand how to even begin to work the problem and how I can separate h, thank you in advance.
Click here to see answer by josgarithmetic(39613)

Question 773893: What is the vertical and horizontal aymptotes of
g(x)=(x+7)/(x^2+4)
Click here to see answer by jim_thompson5910(35256)

Question 774029: how do i find the domain of this expression?
x(x+1)^-2
Click here to see answer by nerdybill(7384)

Question 774449: Find the range of the function if the domain is -2,0,2.
Click here to see answer by solver91311(24713)

Question 774484: At the party, 3/5 of the girls had brown hair. If 12 girls did not have brown hair, how many girls were at the party?
Click here to see answer by reviewermath(1029)

Question 774510: CAN YOU HELP ME FIND TWO NUMBERS WHOSE PRODUCT IS -9 AND SUM IS 0
Click here to see answer by Alan3354(69443)

Question 774511: CAN YOU HELP ME FIND TWO NUMBERS WHOSE PRODUCT IS 20 AND SUM IS 12
Click here to see answer by Alan3354(69443)

Question 774512: CAN YOU HELP ME FIND TWO NUMBERS WHOSE PRODUCT IS -18 AND SUM IS 7
Click here to see answer by Alan3354(69443)

Question 774507: CAN YOU HELP ME FIND TWO NUMBERS WHOSE PRODUCT IS 20 AND SUM IS 17
Click here to see answer by Alan3354(69443)

Question 774513: CAN YOU HELP ME FIND TWO NUMBERS WHOSE PRODUCT IS 30 AND SUM IS -11
Click here to see answer by Alan3354(69443)

Question 774621: what is the domain and range of f(x)=-2x+5
Click here to see answer by tommyt3rd(5050)

Question 774702: how do I solve 365=5X cubed
Click here to see answer by solver91311(24713)

Question 774702: how do I solve 365=5X cubed
Click here to see answer by tommyt3rd(5050)

Question 775000: Find the domain of the following function:
(x-3)^-1/4
The book has the correct answer as (3, infinity), but I do not know how to arrive at this answer. And why did we use round brackets and not square brackets??
Thanks
Click here to see answer by rothauserc(4718)

Question 775099: What is the simplest form of 9/14 - 2/7

Click here to see answer by jim_thompson5910(35256)

Question 775274: trying to find the rule
input (x) 0, 1, 2, 3
output (y) 1, 1.5, 2, 2.5
Click here to see answer by MathLover1(20849)

Question 765821: Find the domain of f(x)= sqrt5+4x-x^2
Click here to see answer by tommyt3rd(5050)

Question 775363: Functions "What is the first four terms of the sequence represented by the expression �7n + 70. Full answer and process needed!
Click here to see answer by Edwin McCravy(20054)

Question 775355: Evaluate the function for f(-4)
f(x)=3x^2-x+2
Click here to see answer by sofiyac(983)

Question 775396: f(x)=3x-4, from x=3 to x=8

Click here to see answer by sofiyac(983)

Question 775582: Find the domain of the composite function f o g
f(x)=1/x-9;g(x)=1/x
According to the rules If there are restrictions on the domain of both f and g, then we apply the restrictions on f to the function g and keep the restrictions on g to find the domain of f o g. If we apply this restriction of f to the g, then g(x)=1/x ≠9 or x ≠ 1/9. Now apply this and the restriction on g to the composite function and submit the domain.
Thank you,
Romy
Click here to see answer by tanjo3(60)

Question 775094: State the domain and range of this:
f(x) = square root of (radical) 4-x
Click here to see answer by tanjo3(60)

Question 774476: What is the rule of this input function: Input: 0,1,2,3,4 Output: 3,6,9,12,15
Click here to see answer by tanjo3(60)

Question 773630: what is the value for the function F(x)=3*2^x when x=-4
Click here to see answer by tanjo3(60)

Question 775591: S(2r) = 1/3*pir^2(2r)= Please help me solve I need this tonight?
Click here to see answer by tanjo3(60)

Question 775592: Volume of a Cone The volume V of a right circular cone is v=1/3pi r^2h. If the height is twice the radius, express the volume V as a function or r.
Click here to see answer by tanjo3(60)

Question 765824: Solve the inequality: 3x/(x+2)<=1/(x+2)
Click here to see answer by tommyt3rd(5050)

Question 775748: how do I find the domain of g(x)= x/ x^2-5x
Click here to see answer by oscargut(2103)

Question 775656: domain of 1/sqrt(144-7x-x^2)
Click here to see answer by tommyt3rd(5050)

Question 775810: determine whether the equation defines y as a function of x
xy-5y=1
Click here to see answer by MathLover1(20849)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660