Tutors Answer Your Questions about Equations (FREE)
Question 306913: A grocer at a specialty store is mixing coffee worth $6 per pound with coffee worth $8 per pound. He wants to obtain 144 pounds of coffee worth $7.50 per pound.How much of each coffee should he use?
Amount of coffee X=108
Amount of coffee Y=36
Click here to see answer by checkley77(12844)  |
Question 306792: I seem to be having a lot of trouble with this problem on my algebra lesson and was wondering if I could get some help? I need to solve for x.
x^3 + 2x^2 - 9x = 18
Any help that could be given would be much appreciated, thanks.
Bre
Click here to see answer by papas101280(2) |
Question 307058: (This is just to know how to write an equation)
According to the kellybluebook.com, the average value of a new car after one year is seven-tenths of its original price. Write an equation representing the price(P)in dollars of a one-year old car in terms of its original price(X).
Click here to see answer by nerdybill(7384)  |
Question 307107: Fifteen more than twice the hours Carla worked last week is the same as three times the hours she worked this week decreased by fifteen. She worked the same number of hours each week. How many hours did she work each week?
- i came up with the equation : 2c+15=3c-15, then i subtracted 2c from each side which is now 15=c-15. but now im stuck. please help
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 307207: Today I've had a real though challenge of trying to solve this problem. At first my teacher couldn't solve it, so I asked some other math teachers and they couldn't either. Even in the teachers guide it did not have the answer, so I'm begging someone to please help me find the answer. I even asked some of the Geometry students who are two math levels above me and they couldn't solve it either! They are doing 10th or 11th grade math right now. So please, I beg some genius out there to help me solve this problem!
There are four plans so far.
On plan 1 the equation is r=2^*-1
The r in the equation stands for total rubas or just rubas.
In this case rubas are a coin from the ancient kingdom of Montarek uses.
The King and Queen both use this coin, because it is there money.
There is a chessboard with 64 squares on it.
One square 1, there is 1 ruba. On square 2, there are 2. On square 3, there are 4. On square 4, there are 8 rubas and so on. Keep going with this pattern until you get to 64 squares. You should then get the number 9.223372037 times 10 to the 18 power. That number is the number of rubas on the 64th square. So the equation would be r=2 to the x power minus 1. So you subtract an exponent. The x stands for an exponent. Every time there is another square, you double the amount of rubas on the previous square. So if there was 64 rubas on square 7, then there would be double that on the next square, square 8, which is 128. And you continue that pattern on until you get to 64 squares.
r=2^x-1
x=exponent
^=the power of
and then minus 1 exponent.
Then you have to figure out the total number of rubas combining all the number of rubas together on all 64 squares. What we got was around 1.85 times 10 to the 19th power. (We rounded the 1.85).
That whole serious was plan 1, an example of what I'm doing. I have already figured out the equation on how to get the anwswer to the problem. What I need to find out is a different plan, plan 2.
Plan 2 goes like this.
On square 1, there are a starting 20 rubas, and every time another square is added, 5 rubas are added to that square. There would be 25 rubas. Then on the 3rd square, there would be 30 and so forth. It goes up by 5 rubas everytime, but starts at 20 rubas on square 1. Remember that.
On square 64 there will be 335 rubas if you continue the pattern of going up by 5 every time. Then the next step gets tricky because you have to add all the amounts of rubas on each square, from 64 squares to get the total number of rubas. I added all of the rubas from each square together on my calculator to get the answer 11,360 which is correct. BUT now I need to figure out the equation of how to get to that number. Of how I added all the number of rubas on each square to get to 11,360.
There is also an equation my teacher gave us but doesn't work with this problem, only with the previous problem.
This is it:
s=Total
a=first amount
r=rate
n=number of squares
Equation:
s=a(1-1^x) / 1-r
r=5 because five is the rate.
Remember x is to a power like 1-1 to the 10th power for example.
What you are trying to solve is how to write an equation based on the plan of how to get 11,360 rubas alltogether. Please Help, I'm desperate!
I'm really not sure on how to do it because I tried it using the equation but it doesn't work. I've asked teachers and really smart students and can't remember how to. I even asked my own teacher and he can't solve it, so he's also been trying to solve it.
If you have any other question beyond all of this, PLEASE comment done below. And if you are able to solve this, you are a amazing genius!
Thanks for taking your time to read all of this! :)
Click here to see answer by jim_thompson5910(35256) |
Question 307207: Today I've had a real though challenge of trying to solve this problem. At first my teacher couldn't solve it, so I asked some other math teachers and they couldn't either. Even in the teachers guide it did not have the answer, so I'm begging someone to please help me find the answer. I even asked some of the Geometry students who are two math levels above me and they couldn't solve it either! They are doing 10th or 11th grade math right now. So please, I beg some genius out there to help me solve this problem!
There are four plans so far.
On plan 1 the equation is r=2^*-1
The r in the equation stands for total rubas or just rubas.
In this case rubas are a coin from the ancient kingdom of Montarek uses.
The King and Queen both use this coin, because it is there money.
There is a chessboard with 64 squares on it.
One square 1, there is 1 ruba. On square 2, there are 2. On square 3, there are 4. On square 4, there are 8 rubas and so on. Keep going with this pattern until you get to 64 squares. You should then get the number 9.223372037 times 10 to the 18 power. That number is the number of rubas on the 64th square. So the equation would be r=2 to the x power minus 1. So you subtract an exponent. The x stands for an exponent. Every time there is another square, you double the amount of rubas on the previous square. So if there was 64 rubas on square 7, then there would be double that on the next square, square 8, which is 128. And you continue that pattern on until you get to 64 squares.
r=2^x-1
x=exponent
^=the power of
and then minus 1 exponent.
Then you have to figure out the total number of rubas combining all the number of rubas together on all 64 squares. What we got was around 1.85 times 10 to the 19th power. (We rounded the 1.85).
That whole serious was plan 1, an example of what I'm doing. I have already figured out the equation on how to get the anwswer to the problem. What I need to find out is a different plan, plan 2.
Plan 2 goes like this.
On square 1, there are a starting 20 rubas, and every time another square is added, 5 rubas are added to that square. There would be 25 rubas. Then on the 3rd square, there would be 30 and so forth. It goes up by 5 rubas everytime, but starts at 20 rubas on square 1. Remember that.
On square 64 there will be 335 rubas if you continue the pattern of going up by 5 every time. Then the next step gets tricky because you have to add all the amounts of rubas on each square, from 64 squares to get the total number of rubas. I added all of the rubas from each square together on my calculator to get the answer 11,360 which is correct. BUT now I need to figure out the equation of how to get to that number. Of how I added all the number of rubas on each square to get to 11,360.
There is also an equation my teacher gave us but doesn't work with this problem, only with the previous problem.
This is it:
s=Total
a=first amount
r=rate
n=number of squares
Equation:
s=a(1-1^x) / 1-r
r=5 because five is the rate.
Remember x is to a power like 1-1 to the 10th power for example.
What you are trying to solve is how to write an equation based on the plan of how to get 11,360 rubas alltogether. Please Help, I'm desperate!
I'm really not sure on how to do it because I tried it using the equation but it doesn't work. I've asked teachers and really smart students and can't remember how to. I even asked my own teacher and he can't solve it, so he's also been trying to solve it.
If you have any other question beyond all of this, PLEASE comment done below. And if you are able to solve this, you are a amazing genius!
Thanks for taking your time to read all of this! :)
Click here to see answer by scott8148(6628)  |
Question 307216: Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $35 one-time activation fee and charges 7 cents a minute. The second plan has no activation fee and charges 12 cents a minute. After how many minutes of long distance calls will the costs of the two plans be equal?
Click here to see answer by mananth(16946)  |
Question 307400: An open box is to be made from a square piece of material by cutting 2 cm squares from each corner and turning up the sides. The volume of the finished box is to be 200 cubic centimeters. Find the size of the original piece of material.
Click here to see answer by scott8148(6628) |
Question 307527: the price of regular unleaded gasoline in Jan. 1997 was 1.26 and in Jan. 2006 it was 2.31 using the coordinates 1997, 1.26 and 2006,2.31 what are the steps to find the slope or rate of exchange between the two points. Please explain how to find this.
Click here to see answer by Earlsdon(6294) |
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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, 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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, 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33526..33570, 33571..33615, 33616..33660, 33661..33705, 33706..33750, 33751..33795, 33796..33840, 33841..33885, 33886..33930, 33931..33975, 33976..34020, 34021..34065, 34066..34110, 34111..34155, 34156..34200, 34201..34245, 34246..34290, 34291..34335, 34336..34380, 34381..34425, 34426..34470, 34471..34515, 34516..34560, 34561..34605, 34606..34650, 34651..34695, 34696..34740, 34741..34785, 34786..34830, 34831..34875, 34876..34920, 34921..34965, 34966..35010, 35011..35055, 35056..35100, 35101..35145, 35146..35190, 35191..35235, 35236..35280, 35281..35325, 35326..35370, 35371..35415, 35416..35460, 35461..35505, 35506..35550, 35551..35595, 35596..35640, 35641..35685, 35686..35730, 35731..35775, 35776..35820, 35821..35865, 35866..35910, 35911..35955, 35956..36000, 36001..36045, 36046..36090, 36091..36135, 36136..36180, 36181..36225, 36226..36270, 36271..36315, 36316..36360, 36361..36405, 36406..36450, 36451..36495, 36496..36540, 36541..36585, 36586..36630, 36631..36675, 36676..36720, 36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580
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