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

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 613302: Use substitution to find the value of d if a = 12, b = 3, and c = 4.
Click here to see answer by jim_thompson5910(28598)

Question 613309: what is the solution of 3(2-p)+(2p+1)-(4+3p)
Click here to see answer by jim_thompson5910(28598)

Question 613579: a=7 b=3 3a-4(b+2)
Click here to see answer by radh(108)

Question 613661: find the value of a3+b3+c3-3abc, given that a=2, b=3 and c=-1

Click here to see answer by radh(108)

Question 613899: how would you solve a system of equations like this one
Y=4x+4
Y=-1.5x+6

Click here to see answer by stanbon(57424)

Question 614090: how can I solve these two equations by substituton:
400=lw
60=l+2w
Click here to see answer by solver91311(16897)

Question 614184: How do you make one of these equations equal 48? The equations and numbers are x+(x+2)+(x+4)=48; 16,17,18
x+(x+1)+(x+2)=48; 15,16,17
Click here to see answer by ewatrrr(10682)

Question 614317: Hello! And thank you for helping me with this question!
Question:
Find a solution to the inequality: x(7 -x)> 8
I tried distributing the x outside of the parenthesis to the 7 and -x in the parenthesis, but then I got stuck. Could you please help me solve this? Thank you!
Click here to see answer by stanbon(57424)

Question 614555: factor
y^3+27
Click here to see answer by Alan3354(30993)

Question 614324: how do you solve when there are two letter variables, i.e. d=vt + .5at^2 (solve for a)
Click here to see answer by asuar010(324)

Question 615302: I am needing help with a problem. 18-[8+(7-3)]
Click here to see answer by stanbon(57424)

Question 615506: The quotient of Y and 6 is 29. Find the value of Y
Click here to see answer by jim_thompson5910(28598)

Question 615524: Simplify: 15+ (2^5- 7) X 3
Click here to see answer by jim_thompson5910(28598)

Question 615942: could u give me 8 equations with variables?
Click here to see answer by richwmiller(9143)

Question 616005: I need to translate this problem as an equation and solve it.
If Chen gives Elyse $5, they will have the same amount of money. If Elyse gives Chen $5, chen will have three times as much as Elyse has. how many dollars do they have together?
Thank you
David R.
Click here to see answer by stanbon(57424)

Question 616190: Find the area of the triangle shown on the right with base 21/5 yards and height 5/6 yard. The area of a triangle equals half the product of its base and height. The area is yd
Click here to see answer by ewatrrr(10682)

Question 616515: +
Click here to see answer by Edwin McCravy(8924)

Question 616894: x=3y
3y-4x+30+-60
show steps please
Click here to see answer by Alan3354(30993)

Question 617106: Solve the given equation for the indicated variable.
7x - 5y = 2(x+1);x
Click here to see answer by nerdybill(6963)

Question 617106: Solve the given equation for the indicated variable.
7x - 5y = 2(x+1);x
Click here to see answer by josmiceli(9698)

Question 617309: A number that is 6 less than y?
Click here to see answer by scott8148(6628)

Question 617639: Simplify the expression
-(12b-10) + 5(3b - 2)
Click here to see answer by jim_thompson5910(28598)

Question 614551: factor by grouping
9a^(2)-40a-25=
Click here to see answer by jim_thompson5910(28598)

Question 617767: How do I do x+y=34 and -2x+4y=110 by elimination?
Click here to see answer by scott8148(6628)

Question 617776: A chemist needs 12 liters of a 36% acid solution. How many liters of 18% acid should be combined with a 45% acid solution to obtain the proper mixture?
My teacher didn't teach us this at all. Please, provide an explanation.
Click here to see answer by josmiceli(9698)

Question 617694: Original price 22.95
books are on sale for 35% off but there's 6% sales tax what is the total cost??:)
Click here to see answer by Theo(3472)

Question 617913: what is the solution to 2x-2-x
Click here to see answer by richwmiller(9143)

Question 618413: help

Click here to see answer by richwmiller(9143)

Question 618413: help

Click here to see answer by solver91311(16897)

Question 618864: subtracting sums 35-(3a+14)
Click here to see answer by rfer(12678)

Question 619025: Solve: 4y-16+y=8y+13-6y

Click here to see answer by ankor@dixie-net.com(15667)

Question 619228: 24x^4+72x^3-54x^2-162x=0
Click here to see answer by ankor@dixie-net.com(15667)

Question 619305: what is the answer this? a(3a+8)?

Click here to see answer by richwmiller(9143)

Question 619347: if it cost $78.86 to buy 3 tickets in japan plus 2 tickets in switzerlan. 3 tickets in switzerland plus 2 tickets in japan cost $74.84. how much does an average movie ticket cost in each country?
Click here to see answer by sophxmai(60)

Question 619349: A store mixes kenya coffee worth $11 per kilo and turkish coffee worth $13 per kilo. the mixure is to sell for $12 per kilo. find how much of each should be used to make a 444kilo mixure.
Click here to see answer by Alan3354(30993)

Question 619344: Solve for k: 7k+m=5k+n,
Click here to see answer by bosco20106(2)

Question 619418: Can you please explain this problem to me. I have given some of the solutions I have tried but do not know if I am doing it right.
To prove or disprove the following: The expression n2 - n + 41 produces a prime number for every positive integer n. (Hint: try the following numbers 1, 10, and 41).
I have tried this in two seperate ways-The first reading the 2 as a power of. Therefore making the problem n^2 -n + 41. The second attempt was n(2) -n +41.
n^2 - n + 41 = 1^2 - 1 + 41 = 1 - 1 + 41 = n=41
n(2) - n + 41 = 1(2) - 1 + 41 = 2 - 1 + 41 = 1 + 41 = 41
Click here to see answer by jim_thompson5910(28598)

Question 619724: d^2 - 10d + 25
A.(d-5)^2
B. (d+5)^2
c. (d-5)(d+5)
d. (d-25)(d-1)
Thank you
Click here to see answer by ewatrrr(10682)

Question 619743: 4x2 – 81y2
A.
(2x + 9)(2x – 9)
B.
(2x + 9y)(2x – 9y)
C.
(2x + 9y)2
D.
(2x – 9y)2
Thank you!
Click here to see answer by ewatrrr(10682)

Question 619749: a2 + 2ab – 80b2
A.
(a – 10)(a + 8b)
B.
(a – 10b)(a – 8b)
C.
(a + 10b)(a – 8b)
D.
(a + 10b)(a + 8b)

Thank you
Click here to see answer by ewatrrr(10682)

Question 620166: a^2 + 2ab - 80b^2
A. (a - 10)(a + 8b)
B. (a - 10b)(a - 8b)
C. (a + 10b)(a - 8b)
D. (a + 10b)(a + 8b)
thanks
Click here to see answer by ewatrrr(10682)

Question 620484: a2 + 6ab – 7b2

A.
(a + 7b)(a – b)

B.
(a + 7b)(a + b)

C.
(a – 7b)(a – b) Thanks

D.
(a – 7)(a + b)

Click here to see answer by ewatrrr(10682)

Question 620484: a2 + 6ab – 7b2

A.
(a + 7b)(a – b)

B.
(a + 7b)(a + b)

C.
(a – 7b)(a – b) Thanks

D.
(a – 7)(a + b)

Click here to see answer by lynnlo(4164)

Question 620514: if an object is dropped from a height of 37 feet, the function h(t)= -16t^2 +37 gives the height of the object after t seconds. Graph the function.
Thanks
Click here to see answer by Alan3354(30993)

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