Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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Algebra: Expressions involving variables, substitution

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Question 114560: Translate " the product of a number and two less than the number" into a variable expression.
Click here to see answer by ptaylor(1578)

Question 114593: i have this problem:

m+6.5=9=-9m-130)
How do I Solve it?
Click here to see answer by checkley71(8405)

Question 114673: Okay, i don't understand this problem:
8P4
---
Except the 8 and 4 are small and on the bottom. I don't even know were to start i think something like 8*4. But they didn't say any substitution or anything.
Thank you SO much!
Click here to see answer by stanbon(26259)

Question 114561: Translate " a nember increased by the difference between eleven and the number" into a variable expression and simply.
Click here to see answer by edjones(3292)

Question 114708: please help my problem solving. (a 165 rope is cut into 3 pieces, the second piece is twice as long as the first. the third is 4 times as long as the second. how long is each piece of rope?) thank you
Click here to see answer by bucky(1732)

Question 114796: F(X)=2X^3 G(X)=x^3
(F + G) (X)=_______________________
(F/G) (X)=__________________________
The last one is f divided by g
Click here to see answer by jim_thompson5910(13787)

Question 114831This question is from textbook algebra 1
: Excuse me how are you. Im 14 years of age, I just got to the ninth grade and i really need help with solving equations with variables on both sides. Its really hard and i would appreciate if you would help me. I have cried and waited. I'm ready to get up wake up and get it right. I'm ready to succeed and i would love if you help me.This question is from textbook algebra 1

Click here to see answer by solver91311(5072)

Question 115161:

-(4a-7)-5a=10+a
I have to solve for a. I've done TONS of problems like this before, but this one I just can't seem to figure out for some reason.
Click here to see answer by checkley71(8405)

Question 115163: Over the past few years the satellite Voyager II has passed by the planets Saturn, Uranus, and Neptune, continually updating information about these planets, including the number of moons for each. Uranus is now believed to have 13 more moons than Neptune. Also, Saturn is now believed to have 2 more than twice the number of moons of Neptune. If the total number of moons for these planets is 47, find the number of moons for each planet.
I'm not sure how to turn that into an equation to solve.
thanks
Click here to see answer by checkley71(8405)

Question 115164: In a recent election in Texas for a seat on the United States House of Representatives, Max Sandlin received 25,557 more votes than opponent Dennis Boerner. If the total number of votes was 135,821, find the number of votes for each candidate.
I need to turn it into an equation and solve.
thanks
Click here to see answer by checkley71(8405)

Question 115165: After a downturn in the economy, a company downsized by 35%. If there are still 78 employees, how many employees were there prior to the layoffs?
Click here to see answer by checkley71(8405)

Question 115184: Again, this is from my nephews Home School course, and it stumps me. Thank you in advance for your help. "One number is 11 more than twice another number. If the sum of the numbers is twice their difference, find the numbers."
Click here to see answer by scott8148(3382)

Question 115233: 1300 total number of hotdogs and hamburgers
962.00 total price
.59 hot dogs
.98 hamburgers
Howmany of each?
Click here to see answer by princess08(3)

Question 115258: How do you work substitution equations?
ex.
t=0.2s+10
4s+5t=35
Click here to see answer by bucky(1732)

Question 115182: This is from my nephews Home School course. Thank you for your help in advance. "The capacities of two trucks are 3 tons and 4 tons respectively. If the smaller truck makes 18 more trips than the larger, it can deliver 12 more tons of freight than the larger. How many trips does each truck make?"
Click here to see answer by ptaylor(1578)

Question 115383: Factor by grouping I don't get this. Can you help me?
3x + 3y + ax + ay

Click here to see answer by prabhjyot(164)

Question 115414:
Solve for A in B = 2 divided by A-10

Click here to see answer by checkley71(8405)

Question 115426: Please help.
Solve the following system by substitution
x + y = 12
y = 2x
Thanks
JMS
Click here to see answer by checkley71(8405)

Question 115389: Factor by grouping Please show me the steps to the solution! Thank you

2x3 - 8x2 - 9x + 36
Click here to see answer by jim_thompson5910(13787)

Question 115727: Please solve for all values of x
x/(x+3)= 5/(x+7)
question from practice regents
Click here to see answer by stanbon(26259)

Question 115748: Please help with this problem, simplify: (3x^3y^-4)^3
Click here to see answer by edjones(3292)

Question 115781: Can you help me solve n-[(7)/(n+2)]-[(3n-1)/(n+2)] and [(-v)/(u+v)]+[(u)/(v-u)]+1?
Click here to see answer by edjones(3292)

Question 115788: Solve each of the following systems by substitution.
5x-2y=-5
y-5x=3
Click here to see answer by nihat(10)

Question 115787: Solve each of the following systems by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.
2x+3y =1
5x+3y=16
Click here to see answer by josmiceli(3003)

Question 115884:
if one has $11.00 in quarters and dimes with total of 80 coins, how many dimes does he have?
Click here to see answer by checkley71(8405)

Question 115898:
How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy that is 50% copper in order to get an alloy that is 30% copper?
Click here to see answer by checkley71(8405)

Question 115895: Ms. Mills invested her $20,000 bonus in two accounts. She took a 4% loss on one investment and made a 12% profit on another investment, but ended up breaking even. How much was invested in each account?
Click here to see answer by Fombitz(2113)

Question 115899: Trudy Waterbury, a financial planner, invested a certain amount of money at 9% annual simple interest, twice that amount at 10% annual simple interest, and three times that amount at 11% annual simple interest. Find the amount invested at each rate if her total yearly income from the investments was $2790.
Click here to see answer by checkley71(8405)

Question 116081: If you could explain to me how to solve this problem, I would appreciate it. I need numerical values for a, b, c, and d. I know this involves substitution, I just don't know where to start! Thank you so much.
2a+3b-4c+6d=6
7a-5b-c=-7
13a-9b=6
d^2-2d=-1
Click here to see answer by Edwin McCravy(2920)

Question 116130: Two hikers are 11 miles apart and walking toward each other. They meet in 2 hours. Find the rate of each hiker is one hiker walks 1.1 mph faster than the other. I thought i knew how to do this, using the D=r*t formula...but I was getting the wrong answer, so I must have something wrong. Thanks!
Click here to see answer by scott8148(3382)

Question 116066: x/2 - 9/x = -7/2
Click here to see answer by ankor@dixie-net.com(6691)

Question 116192: one number is four less than 11 times another. the sum of the two numbers is 92. find the numbers.
Click here to see answer by checkley71(8405)

Question 116202: Please help.
Solve the system by substitution.
4x+2y=8
y=-3x+7
Thanks
JMS
Click here to see answer by jim_thompson5910(13787)

Question 116200: x^2-11xy-42y^2
Click here to see answer by jim_thompson5910(13787)

Question 116287: How many pounds of hamburger that costs $1.10 per pound must be mixed with 50 pounds of hamburger that costs $1.80 per pound to make a mixture that costs $1.30 per pound?
I came up with 200. Please tell me if I am correct!
Click here to see answer by ptaylor(1578)

Question 116284: A stamp collection consists of 5, 13, and 18 cent stamps. The number of 13 cent stamps is one less than twice the number of 5 cent stamps. The number of 18 cent stamps is five more than the number of 13 cent stamps. The total value of all the stamps is $2.60. Find the number of 13 cent stamps in the collection.
So far, I have a= 5 cent stamps, b= 13 cent stamps and c = 18 cent stamps.
b= 2a-1
c= (2a-1)+5

Click here to see answer by Fombitz(2113)

Question 116431: I do not understand how to chart a problem. this is the problem that was given to me:
the length of a rectangle is 12cm more than its width. A second rectangle is 3 cm shorter in width and 5 cm longer in length than the first triange, and has a perimeter of 68cm. what are the dimensions of this second triangle?
Thank you for your help. It is greatly appreciated.
Click here to see answer by ankor@dixie-net.com(6691)

Question 116504: A Chemist wants to make a 10% solution of Fertilizer. How much water and how much of a 30% solution should the chemist mix to get 30L of a 10% Solutio.
Click here to see answer by josmiceli(3003)

Question 116528: solve by using the Quadratic formula xsqrt+4x-1=0 i try for hours not right
Click here to see answer by solver91311(5072)

Question 116681: How do you write 3x = y + 4 in y = mx + b term
Click here to see answer by stanbon(26259)

Question 116816: Need some help. I have figured out the first part of this question but need help on the second.
Evaluate the functions for the values of x given as 1,2,4,8 and 16. This is the first part that I figured out.
f(x)=x^2+5x+6
f(1)=1^2+5*1+6=12
f(2)=2^2+5*2+6=20
f(4)=4^2+5*8+6=42
f(8)=8^2+5*4+6=110
f(16)=16^2+5*16+6=342
I need to know which increases the fastest? The slowest? And how their outputs compare since the input is the same?
Need help just not sure how to answer second part???
Thank you!
Click here to see answer by solver91311(5072)

Question 117181: Suppose Sashac, a champion bicyclist, wants to see how far he can travel in an hour. He stats timing himself when he reaches a speed of 45 miles/hour. He maintains this speed for 10 minutes. Sascha starts to feel tired and slows down to 30 m/h for the next 5 minutes. He then reduces his speed to 25 m/h for the next 30 minutes. Finally, Sascha feels exhausted as he finishes the last 15 minutes at 15 m / h. I get the average speed he travels is 28.75 but get that he travels only 26.25 and if he travels for an hour it doesn't make sense what did I do wrong. Thanks
Click here to see answer by bucky(1732)

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