Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!

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Question 93827: find the common solution
px + qy = r
2px - qy = 2r


Thank you for you time.

Click here to see answer by stanbon(75887) About Me 

Question 93852: how do i combine like terms:
4(2x+y) - 2 (2x+y)


Click here to see answer by checkley75(3666) About Me 
Question 93852: how do i combine like terms:
4(2x+y) - 2 (2x+y)


Click here to see answer by jim_thompson5910(35256) About Me 

Question 93856: combining like terms?
-(2x+y) - 2(-x-y)

Click here to see answer by praseenakos@yahoo.com(507) About Me 

Question 93923: x exponent 2 - x - 20 = 0
Click here to see answer by checkley75(3666) About Me 

Question 93921: perfect square trinomial formula
y exponent 2 - 12y + 36=

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Question 94286: [(2+3).2.2+4.5]+7
Click here to see answer by chitra(359) About Me 
Question 94286: [(2+3).2.2+4.5]+7
Click here to see answer by jayanthihemkos@yahoo.com(87) About Me 

Question 94254: 2(x-3)+2=-4

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Question 94319: Hi, I need help with the problem:
3+ (1 + 2^3)^2
I keep getting different answers. When I worked it I got 68, but when I used my calculator it said 84.
Thanks

Click here to see answer by edjones(8007) About Me 

Question 94342: AHi. I was wondering if I could recieve help on the following problem:
I know you do order of operations, but I do not know if it matters if I multiply or divide first after I get the exponent.
4 - 4^2 divided by 8 x 3 + 6
What I did was get 4 -16 divided by 8 x 3 + 6
Then if I multiplied first, I would get 4 - 16 divided by 24 + 6
Then I would get 4 - 2/3 + 6. Then I'd get 9 and 1/3.
On my calculator I got 4, but that would only work if I divided before I multiplied. I know division and multiplication are inverse opperations, so would it be okay if I divided first and got 4 as the answer?
Thanks.

Click here to see answer by stanbon(75887) About Me 
Question 94342: AHi. I was wondering if I could recieve help on the following problem:
I know you do order of operations, but I do not know if it matters if I multiply or divide first after I get the exponent.
4 - 4^2 divided by 8 x 3 + 6
What I did was get 4 -16 divided by 8 x 3 + 6
Then if I multiplied first, I would get 4 - 16 divided by 24 + 6
Then I would get 4 - 2/3 + 6. Then I'd get 9 and 1/3.
On my calculator I got 4, but that would only work if I divided before I multiplied. I know division and multiplication are inverse opperations, so would it be okay if I divided first and got 4 as the answer?
Thanks.

Click here to see answer by edjones(8007) About Me 

Question 94340: ``Hi, I need help with the problem:
3+ (1 + 2^3)^2
I keep getting different answers. When I worked it I got 68, but when I used my calculator it said 84. When I worked it, I squared the 1 and got 1 and squared the 2^3 and got 2^6. Then I added 1 to the 64 (2^6) and got 65. Then I added 3 and got 68. I know how the caluclator got 84, but the way I learned it you are supposed to multiple by the 2 first. If you could help me that would be great.
Thanks

Click here to see answer by stanbon(75887) About Me 

Question 94355: Hi! Can you help me with the problem:
Write an expression for the difference of 4 and the square of a number.
I do not know whether it is 4 - n^2 or n^2 - 4
Thanks. :)

Click here to see answer by tutorcecilia(2152) About Me 

Question 94107: Simplify the following expressions. Write your answers with positive exponents only.
(x^2)^-3(x^-2) / (x^2)^-4

Click here to see answer by ankor@dixie-net.com(22740) About Me 

Question 94400: i have previously submitted this question but have not received an answer. I have had a go myself but am not sure if I have done it correctly. would you please be able to check what I have done, and let me know if I am on the right track? Thank you.
The problem is a substitution equation where a=2,b=3,c=-4 & d=-1.
%28a%2Fb%29%5E2+-+%28c%2Fd%29%5E3
%282%2F3%29%5E2+-+%28-4%2F-1%29%5E3
%282%2F3%29%282%2F3%29+-+%28-4%2F-1%29%28-4%2F-1%29%28-4%2F-1%29
2%2F3%2A2%2F3+-+4%2A4%2A4
%282%2A3%29%283%2A2%29%2F3%2A3+-+64
6%2A6%2F9+-+64
36%2F9+-64
4+-+64
=60

Click here to see answer by praseenakos@yahoo.com(507) About Me 
Question 94400: i have previously submitted this question but have not received an answer. I have had a go myself but am not sure if I have done it correctly. would you please be able to check what I have done, and let me know if I am on the right track? Thank you.
The problem is a substitution equation where a=2,b=3,c=-4 & d=-1.
%28a%2Fb%29%5E2+-+%28c%2Fd%29%5E3
%282%2F3%29%5E2+-+%28-4%2F-1%29%5E3
%282%2F3%29%282%2F3%29+-+%28-4%2F-1%29%28-4%2F-1%29%28-4%2F-1%29
2%2F3%2A2%2F3+-+4%2A4%2A4
%282%2A3%29%283%2A2%29%2F3%2A3+-+64
6%2A6%2F9+-+64
36%2F9+-64
4+-+64
=60

Click here to see answer by jim_thompson5910(35256) About Me 

Question 94478: If 4 is added to a certain number, the result divided by 2, that result multiplied by 5, and then 6 subtracted from that result, the answer is 29.
The question says: choose a variable and write an algebraic equation to reprssent the puzzle

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Question 94658: y+12when y=29
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Question 94825: If xy=10, what is the value of 2 X x/y X y%5E2?
Click here to see answer by jim_thompson5910(35256) About Me 

Question 94864: is 14 the solution in of equation x+11=39
Click here to see answer by stanbon(75887) About Me 

Question 95014: Place parentheses to make the following equation true
13 - 4 x 5 / 2 +10 = 13

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Question 94990: 6x+2 for x=3
Click here to see answer by edjones(8007) About Me 

Question 95090: 13. For all x ≠ –4, which of the following is equivalent to the expression below?
x2+12x+32/x+4
A. x + 3
B. x + 8
C. x + 11
D. x + 16
E. x + 28

Click here to see answer by stanbon(75887) About Me 

Question 95162: Hello,

I need help finding the quotient for this problem:
(t^2+4t-6)/(t+5)

Thank you

Click here to see answer by stanbon(75887) About Me 

Question 95380: 7 more than the product of 6 and a number
Click here to see answer by edjones(8007) About Me 

Question 95349: How would I write an English version for this problem
2x-5=x+1

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Question 95423: 30 increased by 3 times the square of a number
Click here to see answer by kiljoy(51) About Me 

Question 82162: Which of the following is not an expression
p(z+4)
p+/z
zxp-4
z+p+4

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Question 77803: determine whether the given number is a solution to the equation following it.
5,3x-7=2x+1

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Question 95470: Please help me solve this problem:
5-2*2+8*5-2=28
I was asked to add parenthesis where it makes the problem equal 28. I could not figure it out, please help.

Click here to see answer by scott8148(6628) About Me 

Question 95673: Hello, can you please help me? The directions say to simplify the xpression involving rational exponents. Assume all variables represent positive real numbers. Write the answer with positive exponents.

(x^2y^-3z)^1/2
______________
x^1/2yz^-1/2

Thank you for your help.

Click here to see answer by stanbon(75887) About Me 

Question 95904: 3/4(1/3)
________ +3^2
-2

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Question 96094: I need to evaluate 120(0.05)(3.5
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Question 96142: What does the |x| around a number mean? Here is an example of a question that is asking me for a simple "greater than or less than" (equal is not a choice).
Q: -2 ___ |-2|
A: a. > or b. <

Click here to see answer by jim_thompson5910(35256) About Me 
Question 96142: What does the |x| around a number mean? Here is an example of a question that is asking me for a simple "greater than or less than" (equal is not a choice).
Q: -2 ___ |-2|
A: a. > or b. <

Click here to see answer by stanbon(75887) About Me 

Question 96257: /x/+3=8 solve
Click here to see answer by tutorcecilia(2152) About Me 

Question 96273: the surface of a rectangular prism is the sum of
the product of twice the length l and the width w,
the product of twice the length and the height h,and
the product of twice the width and the height
wtire and expression the represents the surface area of a prism

Click here to see answer by checkley71(8403) About Me 

Question 96388: The question in the book is... Simplify the expression by combining like terms.
20. p + 9q + 9 + 14P
24. 8(y + 2)+ y + 4
The book doesn't give examples of the above questions. Please help my daughter to understand combining like terms when ( ) are involved in the expression. Thank you. - Laura P.

Click here to see answer by bucky(2189) About Me 

Question 96414: If x to the second= x to the third, give the two possible values for x
Click here to see answer by bucky(2189) About Me 

Question 96454: please help me solve this equation -2+8
Click here to see answer by edjones(8007) About Me 

Question 96460: Insert parentheses so that the equation is correct

(8+4x)(2+7)divided by 3=20

Click here to see answer by anjali_yamini(27) About Me 

Question 96466: 1.) 4+5-9=
2.) 26-(-9)-6=
3.) 5-5-5=
4.) -4-4+(-15)=

Click here to see answer by stanbon(75887) About Me 

Question 96603: 14.13x21.6
Click here to see answer by tutorcecilia(2152) About Me 

Question 96653: find distance between (-3,-2) and (1,7)
Click here to see answer by checkley71(8403) About Me 

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