Tutors Answer Your Questions about Functions (FREE)
Question 173780: Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100mph and train B is traveling at 120mph. Train A passes a station at 8:15A.M. If train B passes the same station at 8:30A.M., what time will train B catch up to train A?
I don't even know if I am asking this question in the right section or not, but it has me baffled.
Click here to see answer by stanbon(75887)  |
Question 173684: Given that f(x) = x2 + 3 and D = {reals}, find f(-3).
Given that g(x) = x + 4 and D = {reals}, find g(3).
Given that f(x) = 3x + 1 and D = {integers}, find f(-2).
Given that h(x) = x2 - 3 and D = {reals, find h(-4).
Given that g(x) = 2x - 1 and D = {integers}, find g(5).
Given that f(x) = 3x + 1 and D = {reals}, find f(-6).
Given that f(x) = x2 -2x and D = {reals}, find f(2).
Given that f(x) = x - 3 and D = {reals}, find f(-2).
Given that f(x) = 2x2 and D = {reals}, find f(4).
Given that f(x) = 2x3 and D = (reals}, find f(2).
Click here to see answer by solver91311(24713)  |
Question 173893: For some reason I cannot remember the formula for this problem, I know that I could solve it if I could remember the formula.
Soybean meal is 12% protein; cornmeal is 6% protein. How many pounds of each should be mixed together in order to get a 240lb mixture taht is 8% protein?
How many lbs of the cornmeal should be in the mixture?
How many lbs of the soybean meal should be in the mixture?
Would the formula be .12x + .06y=240?
Click here to see answer by nerdybill(7384)  |
Question 174035: Ok this problem is really confusing, I feel like I might know what to do but I cannot remember the formula to do it.
In 1992, the life expectancy of males in a certain country was 61.7 years. In 1997, it was 64.5 years Let E express the life expectancy in year t and let t represent the number of years since 1992.
The linear function E(t) that fits the data is
E(t)=__t+__
Use the function to predict the life expectancy of males in 2005.
E(13)=?
Click here to see answer by stanbon(75887) |
Question 174103: I really need your help I post these question yesterday, but I did not receive an answer please help
Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.
f(x)= 10^x
f(x)= Inx
Thank you inadvance
Click here to see answer by SAT Math Tutor(36) |
Question 174101: You know I really need you guys help I try and try I'm 60 years old trying to learn this math I do get some but not all so please help me I really need help thank you so
Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x. much for taking time out of your busy schdule to assist me. truely I'm greatful to you.
f(x) = 5x -3
f(x) = x^2 -3x + 2
f(x) = 2x^3 + 7x^2 -x -1
can you show me step by step I'm very greatful for your help
Click here to see answer by Earlsdon(6294) |
Question 174057: Can someone please help me I'm going crazy here I've been working on this for 3hr still having a hard time please help please help.
Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x. f(x) = 5x -3 f(x) = x^2 -3x +2
Click here to see answer by checkley77(12844) |
Question 174147: can you please let one more time please thank you in advance
Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.
f(x) = 2x^3 + 7x^2 -x-1
Click here to see answer by stanbon(75887) |
Question 174251: log378= 2.5775
-------------------
5In(r) + 3In(t) - 4In(s)
= lnr^5 + lnt^3 - lns^4
= ln[r^5*t^3/s^4]
----------------------------
In(x) +In(x-2) = In(x+2) + In(x-3)
g(x) = xto the 2nd power + 3 and h(x) = x+ 3
______
2 Find (h o g)(x)
Click here to see answer by stanbon(75887) |
Question 174588: I am very unsure when it comes to functions. Can you please help me to understand what makes something a function? Here is the question.
Which of the following are functions? Explain why/why not.
A. f(x)=2 if x>1 otherwise f(x)=-1
B. f(x)=5 if x>0 or f(x)=-5 if x<0 or f(x)=5 or -5 if x=0
C. f(x)=x/10
Any help I recieve would be greatly appreciated as I am so utterly confused.
Click here to see answer by stanbon(75887) |
Question 174601: How come and forgive me for saying, Why are there not andy function solutions? I have looked all over the place..I was looking for. Here is the Poblem:
Find F(x-1)when f(x)= 3x^2+2x+3
I can not find it anywhere to help me solve this part of my packet...Help
Click here to see answer by Mathtut(3670) |
Question 174626: 4.) If sin(2theta + 18) = cos(5theta - 12), which of the follwoing pairs of angles are represented in this equation?
(a)42, 48 degrees
(b)38, 52 degrees
(c) 12, 68 degrees
(d) 45, 45 degrees
5) Crossing a wooden bridge at Letchworth Park, Melissa drops a penny into the water below for good luck. If the height of the penny is modeled by the function h(t)=64 - 16t^2, where t represents time in seconds and h(t) is height in feet, how many seconds did it take the penny to hit the water?
(a) 1 (b) 2 (c) 3 (d) 4
Sh0w work thanks so much!
Click here to see answer by nycsub_teacher(90) |
Question 174655: I can not seem to figure this out. I have been workign on this for two hours and trying to figure it out..Can anyone help?
Given the function f(x)=6x^2-12x-2 what is the domain of f?
Is it all real numbers?
Is it {x\x >or equal to -1}
{x\x> or equal to 1}
or
{x\x< or equal to -1}
In between the X's has a straight line up and down and these symbols< > has a line under it_
I appreciate all the support I can get Thank you
Click here to see answer by Earlsdon(6294) |
Question 174671: I need help on this one and It is not listedhere and I looked...Help
Determine whether the relation represents a function. If it is a function, state the domain and range.
Problem: {(-2,-1),(-1,-4),(0,-5),(1,-4),(3,4)}
the answers llisted on my sheet is
A. Function, domaion is:{-1,-4,-5,4} and Range is {-2,-1,0,1,3}
B. Function, Domain is ;{-2,-1,0,1,3} Range {-1,-4,-5,4
C. Not a Function
I choosen Not a function is that correct?
Please show me the correct way if I am wrong I appreciate it...Not very good in algebra...Help
Click here to see answer by nycsub_teacher(90) |
Question 174654: I can not locate given function and locate intercepts of the function can someone help me with these problems?
1. Given the function f(x)=-6x^2-12x-2, what is the domain of f?
A. real numbers b. {x\x>-1} the sign in the middle has a line under the lessthan. and a straigt line up and down at between the X's.
C. {x\x>or equal 1} or D. {x\xgreter or equal to-1} I choosen C.
2. Use a graph utility to graph the function over the indicated interval nad approx any local maxima nd local minima. If necessary, round answers to two decimals: f(x)=2+8x-x^2; (-5,5) here are the choices I have to pick:
a. local minimum at (4,50) B. local minimum at (4,18)
C. local minimum at (-4,18) D. local minimum at (-4,50)
I choosen A is that correct or where did I go wrong?
3. Find the average rate of change for the function between the given value:
f(x)= sqrt over 2x-1; from 1 to 5
A. 1/2 B. -28 C. -1/6 D. -2 I choosen B. is that correct?
4. Locate any intercept of the function.
f(x) = { on the side of -3x+9 and underneath 9x-3 if x<1 and underneath if v>1 with a line under the >
The answer if have to choose from is:
A. (0,3) B. (0,3),(3,0),(1/3,0) C. (0,9),(3,0),(1/3,0) D. (0,9)
I have choosen D is that correct..
I need some help and cannot find these in the book...
Click here to see answer by nycsub_teacher(90) |
Question 174633: How come and forgive me for saying, Why are there not andy function solutions? I have looked all over the place..I was looking for. Here is the Poblem:
1. Find the equation of the secant line containing (1,f(1)) and (2,f(2)).
problem : f(x)=x^3+x
2. Find the value for the function
Problem: Find -f(x) when f(x) = -3x^2+3x-3
3. Determine whether the relation represents a function. If it is a function, state the Domain and Range.
Problem: {(-2,-1), (-1,-4), (0,-5),(1,-4),(3,4)}
My answer to this question is A. Domain is {-1,-4,-5,4} Range; {-2,-1,0,1,3} is that correct for this problem or is it not a function?
4. Find the Domain of the Function: g(x)= X / (x^2-36) ( X over x sqr minus 36)
I can not seem to find these and I need the help....
Click here to see answer by nycsub_teacher(90) |
Question 173241: Marta gets paid only when she finishes tiling a room. the first rooms that Marta tiled were all square rooms. write a function S such that S(n) expresses the number of tiles required to cover a square floor that has n tiles along the edge of the room. include the domain of the function in your answer.
Click here to see answer by no mystery(1) |
Question 174857: A quiz question concerning finding an equation of a parallel line containing the points (2,-1) and parallel to the line 9x-3y=5. I found the slope of both lines to be -3. But their answer (which is y=-3x - 7) confused me. How did they arrive at -7? I used the Point-Slope Equation & Slope Intercept Equation. For example, using the point-slope equation: (y-y1)= m(x-x1)=(y-(-1)) = -3(x - 2). I cannot find how this results in a -7 (or y= -3x - 7) when you do the calculation. Please show me how. Thanks, Charlie
Click here to see answer by actuary(112) |
Question 174877: A bookstore is having a sale in which all paperbacks are $6 each. The store is limiting the number of books that a customer can buy to 8.
a. Use the number books a customer can buy to write a domain for this problem.
b. If Katrese does not want to spend more than $25, the number of books she might buy, b, is given buy the expression 6b is less than or equal to 25. Find the soulution set of this open sentance using the domain from part a.
(I dont understand how to execute this problem to get the correct answer. Any help will be greatly apperciated)
Click here to see answer by josmiceli(19441)  |
Question 175276: I failed college algebra and I am going to take it again this semester. I did not understand how to do a matracee by hand or on the TI 183, I could not figure out what to multiply by after you have entered in your 3x4 edit enter enter and then what to multiple first to get your numbers to change to 1's or 0's . Please help me to understand this thank you very much.. deborah robeson
Click here to see answer by EMStelley(208)  |
Question 175421: Question #1
Whitmore Area Schools had an enrollment of 2700 students in 1990 and 12,500 in 1998. Assuming the growth is linear, write an equation of the enrollment, E, in terms of the year using t = 0 for 1990.
Question #2
Given f(x) = x^3+4 and g(x) = 3√x (3square root x), find (f of g) (-3)
Click here to see answer by Mathtut(3670) |
Question 175470: The table gives the attendance at a football championship for five consectutive years. Is attendance a function of the number of years since 1993? Why, or why not?
Year 1- 72,817
Year 2- 74,107
Year 3- 76,347
Year 4- 72,301
Year 5- 68,912
Click here to see answer by Mathtut(3670) |
|
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
|
