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

Tutors Answer Your Questions about Functions (FREE)

Question 520376: how would find the value of 3[f(-2)] if f(x)=4x+2?

Click here to see answer by stanbon(75887)

Question 520376: how would find the value of 3[f(-2)] if f(x)=4x+2?

Click here to see answer by solver91311(24713)

Question 520683: Identify the vertex of the graph of f(x)=(x-5)^2-8
Click here to see answer by Math_prodigy(24)

Question 521539: Find (f*g)(x) and (g*f)(x) for each f(x) and g(x)
f(x)=x+5
g(x)=x-3
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Question 521929: 2/5*x=6=18
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Question 522054: solve for x: y=(800/x)+20
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Question 522064: I f x + 1 / x = 3 t h a n x 2 + t / x 2 = ?
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Question 522270: f(x)=9x^4-25^2 how to find the zero of the function algebraically
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Question 522419: Write an equation in functional notation using this word problem..
Martin earns $7.50 per hour proofreading ads at a local newspaper. His weekly wage, w, can be described by the equation w = 7.5h, where h is the number of hours worked.
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Question 522847: Solve: f(-4)=4(-4)^(1/2) Is there no solution?
Click here to see answer by Alan3354(69443)

Question 522819: suppose that f and g are a pair of inverse functions. if g(-8)=3, what is f(3)?
Click here to see answer by jim_thompson5910(35256)

Question 523136: 3x+4y=0
4x+2y=3
Solve by elimination
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Question 523189: given the function f(x)=x+3/2x-1, find f(0)
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Question 523233: what is the domain of f(x)= the square root of (x-4) over the set of real numbers?
Click here to see answer by lwsshak3(11628)

Question 523284: evaluate the function rule f(a)=-3a+5 to find f(-3)
Click here to see answer by Alan3354(69443)

Question 523285: evaluate the function rule f(a)=-3a+5 to find f(-3)
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Question 523306: to convert a length in inches to centimeters c, multiply by 2.54 give the domain range & formula

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Question 523528: I need to find the domain of this equation: f(x)=4/3x+7
Click here to see answer by oberobic(2304)

Question 523286: The function f is linear and satisfies f(d+1)-f(d)=3 for all real numbers d. What is f(3)-f(5)? Please show your work.
Thanks in advance for your help!
Click here to see answer by richard1234(7193)

Question 524386: f(x)=x^3-x^2-34x-56

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Question 524621: f(a+2)=(a+2)+7
Click here to see answer by Alan3354(69443)

Question 525668: My problem is: (x+5)^2 + 4(x+5) - 32
I don't understand how to do this problem at all, but I did try. I somehow simplified it into this:
x(x + 4 + 32/x)
I asked my teacher if I did it right and she said no, but didn't tell me the right answer or how to do it. I am in honors Algebra II and she says she shouldn't have to teach an honors student. So, I need help because I can't figure it out, and I don't even know what I am doing. Could you please help me?
Click here to see answer by Maths68(1474)

Question 525839: If f(x)=3x+7 and g(x)=x-2x find the value of f(-2)
Click here to see answer by Tatiana_Stebko(1539)

Question 525838: If f(x)=3x+7 and g(x)=x-2x find the value of f(3)
Click here to see answer by Tatiana_Stebko(1539)

Question 525831: determine the y-intercept of the equation: 2x-3y=12
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Question 525866: What is the rule that represents the function of the following ordered pairs?
(0,1), (1,3), (2,9), (3,27), (4,81)
I have been working on this for 2 hours and cannot figure it out.
Thank you.
Click here to see answer by jim_thompson5910(35256)

Question 525822: state the range of the relation: {(2,0),(-3,1),(0,-2)}
Click here to see answer by Tatiana_Stebko(1539)

Question 525956: f(x) = x + 7
g(x) = sqrt (x)

f + g
f - g
fg
f/g
Click here to see answer by edjones(8007)

Question 526182: What does ! mean? As in 5!. I heard it means down factoring. (5*4*3*2*1) or 120? Am I correct or wrong. If so what. Thanks.
Click here to see answer by Alan3354(69443)

Question 526559: find the vertix of the parabola
f(x)=25-10x+20x^2
Click here to see answer by Alan3354(69443)

Question 526701: ordered pairs (1,81), (2,100), (3,121), (4,144), (5,169) what is the rule that represents this function? Could you please help so I can help my daughter understand. Thank-you
Is it y=8x?
Click here to see answer by jim_thompson5910(35256)

Question 527133: Find the domain of the following rational expression:
3x^2 over x+4
Click here to see answer by oberobic(2304)

Question 527240: Is this a function? {(6,-2)(6,-3)(-3,5)
Click here to see answer by stanbon(75887)

Question 527334: find the domain of the given function
f(x)=3x^3-4x^2+x-1
Click here to see answer by jim_thompson5910(35256)

Question 527336: find the domain of the given function
f(y)= 1/(y+1)
Click here to see answer by jim_thompson5910(35256)

Question 527393: meaning of x^2
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Question 527411: the domain for x = 0,2,4,6 identfy and graph the soulotion for 2x = x squared
Click here to see answer by oberobic(2304)

Question 527400: In the complicated world we live in, it's good to find smlipe solutions.
Click here to see answer by Alan3354(69443)

Question 527405: For all positive numbers a and b, a function f satisfies the equation f (a b) = f(a) + f(b). if f(2) = x and f(5) = y, what is the value of f(100), in terms of x and y?

Click here to see answer by richard1234(7193)

Question 527232: Isthis a function? y= 5 times the square root of x , y>or equal to 0.
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Question 527905: Given that y varies directly with x, use the specified values to write a direct variation equation that relates x and y.
x=24, y=3

I don't get the instructions.
Thank you!
-Jenna
Click here to see answer by jim_thompson5910(35256)

Question 527908: what is the domain of this rotational function 5X/X-7 ??
Click here to see answer by jim_thompson5910(35256)

Question 527499: In your own words, define the word �function.�
Give your own example of a function using a set of at least 4 ordered pairs. The domain will be any four integers between 0 and +10. The range will be any four integers between -12 and 5. Your example should not be the same as those of other students or the textbook. There are thousands of possible examples.
Explain why your example models a function. This is extremely important for your learning.
Give your own example of at least four ordered pairs that does not model a function. The domain will be any four integers between 0 and +10. The range will be any four integers between -12 and +5. Your example should not be the same as those of other students or the textbook. There are thousands of possible examples.
Explain why your example does not model a function.

Click here to see answer by richard1234(7193)

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