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

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Question 985301: I already typed this question into cymath.com and got an answer... however... I need all the steps to understand what is happening.
x^2/(x^2-4) - (x+1)/(x+2)
It says to cross multiply, how do you even do that?????
Thanks.

Click here to see answer by MathTherapy(10555) About Me 

Question 985399: What can I do I need two of each with 12, 11 and 15 I already did ne with 12 and I need to use all of these numbers 18, 2, 3 and 4 I an use (), -, +, multiplication and division, ^2 and ^3. the one i did with 12 is 18-(2^3/4) * 3


Thanks.

Click here to see answer by macston(5194) About Me 

Question 985394: Insert parentheses to make the expression equal 20 7+3x3-1+7
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Question 985577: Evaluate 54x÷5 for x=10
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Question 985611: I cant figure out how to simplify this expression 7-4[3-(4y-5)]
and get the answer which is 16y-25

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

Question 985770: WIRELESS PHONE Spinfrog wireless
phone company bills on a monthly basis.
Each bill includes a $50.00 service fee for
1000 minutes. Additionally, there is
a charge of $0.25 for each minute used
over 1000. Let m represent the number
of minutes over 1000 used during the
month. Write an equation to describe the
cost c of the wireless phone service per
month.

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

Question 985803: 3*4^2-2^3-3^2=23
We were asked to put grouping symbols in this problem to make it true. I have tried every group of parentheses, left the exponents outside of parentheses and I am at my wits end. Just when I think I have it and something makes sense it does not equal 23. Please help

Click here to see answer by macston(5194) About Me 

Question 985753: Perform the following operation leaving your answer as a number to a power. Remember that the parenthesis can mean multiply as well. Problem (12 to the ninth power).
Click here to see answer by ikleyn(52832) About Me 

Question 985756: What is the product of triple tea number and five?
Click here to see answer by EdenWolf(517) About Me 

Question 985996: 6-2^2
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Question 986399: I really need help with this question.
Find the sum of 34+35+36+37+...+102+103
I have been trying to figure it out, but now I am just getting frustrated. Please help me step by step on what I am actually supposed to do!

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

Question 986452: I am having trouble working out the expression (25(x^4)(y^6))^(1/2)
the book says the answer is 5x^2|y|^3
Thank you for your time and help.

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

Question 986787: Please solve -(x+3y-3)=
Click here to see answer by jim_thompson5910(35256) About Me 

Question 986798: Insert parentheses to make each statement true.
15-3x4+9=12
15-3x4+9=57

Click here to see answer by solver91311(24713) About Me 

Question 986932: Evalute the following determinant
[5 -2 -4]
[3 -1 -3]


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Question 987053: insert parenthesis so that 36 + 12 / 3 + 3 + 6 x 2 is equal to 38
Click here to see answer by macston(5194) About Me 

Question 987234: Where would put parentheses so that 4 squared * 3 - 2/ 4 would equal 4
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Question 987235: Where would I insert parentheses so that 9 squared - 2 * 15 + 16 - 8 would equal 11
Click here to see answer by macston(5194) About Me 

Question 987379: Evaluate. 7!-4!/(6-3)!
Please copy and paste the link below to see how it looks, because the "/" is a fraction symbol not division. Thanks. Show all work please.
Link : http://prntscr.com/8clp2w

Click here to see answer by solver91311(24713) About Me 

Question 987390: Can someone help me evaluate this? And show work please. Thank you.
Copy and paste the link to see thanks! :)
1st one : http://prntscr.com/8cn4h3
2nd one : http://prntscr.com/8cn4rn
thanks once again.

Click here to see answer by solver91311(24713) About Me 

Question 984985: Given f(x) =3x
g(x)= 5x^2 +3…..find the following expressions.
(a) (fog)(4)
(b) (gof)(2)
(c) (fof)(1)
(d) (gog)(0)

Click here to see answer by farohw(175) About Me 

Question 987971: For the following I have an answer of 75
84-18/9-32x5-3

Multiplication first 32 x 5
Division of 18/9
Then worked left to right
84-2-160-3
Yet the answer is -81
Would you please show me where I am going wrong.
Thank you

Click here to see answer by Alan3354(69443) About Me 

Question 987968: For the following I keep coming up with the answer 2.25
(6+3/(9-7))/2
The answer is 3.75 but I don't know where I'm going wrong. Can you please enlighten me.

Click here to see answer by Alan3354(69443) About Me 

Question 988162: What is (4-7)²-6×7+20
Click here to see answer by MathLover1(20850) About Me 
Question 988162: What is (4-7)²-6×7+20
Click here to see answer by josgarithmetic(39623) About Me 

Question 988178: The perimeter of a rectangle with a width x and a length that is three times the width
Click here to see answer by solver91311(24713) About Me 

Question 988312:
Click here to see answer by EdenWolf(517) About Me 

Question 988473: Please help me solve this equation: -2-2(2-8b)
Click here to see answer by Alan3354(69443) About Me 

Question 988463: -11/12+(-1/10) how do i evaluate that
Click here to see answer by solver91311(24713) About Me 

Question 988499: TechWiz Electronics makes a profit of $35 for each MP3 player sold and $18 for each DVD player sold. Last week, TechWiz sold a combined total of 130 MP3 and DVD players. Let x be the number of MP3 players TechWiz sold last week. Write an expression for the combined total profit (in dollars) TechWiz made from MP3 and DVD players last week.
Click here to see answer by macston(5194) About Me 

Question 988713: evaluate the expression 20+3c+17d when c=8 and d=-2
Click here to see answer by jim_thompson5910(35256) About Me 

Question 988995: 1.)When the expression x^3+mx^2+nx-5 is divided by x+2 and x+3, the remainders are 2 and 13 respectively. Find the values of m and n.
2)When P(x)=x^2+ax-b is divided by x-1, the remainder is 6. When P(x) is divided by x+2, the remainder is 3. Find the values of a and b.
Please help me and thank you

Click here to see answer by KMST(5328) About Me 

Question 989034: Finding first expression
Determine the frist expression to evaluate In each problem
Ex) 5+(8×5)+72÷8. Answer for this is 8×5
1)5+9+10+16÷4
So what at I'm trying to figure out is what do I have to do please help me

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

Question 989518: 8 x 4 - 3 +1 = 0
Where do I insert parentheses to make this correct?

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Question 989518: 8 x 4 - 3 +1 = 0
Where do I insert parentheses to make this correct?

Click here to see answer by macston(5194) About Me 

Question 989682: How do you solve this algebra equation?
9k + 6 = 8k + 13

Click here to see answer by josgarithmetic(39623) About Me 
Question 989682: How do you solve this algebra equation?
9k + 6 = 8k + 13

Click here to see answer by ikleyn(52832) About Me 
Question 989682: How do you solve this algebra equation?
9k + 6 = 8k + 13

Click here to see answer by MathTherapy(10555) About Me 

Question 989709: 2k^4 * (3k)^2
I got the answer of 18k^6, but I don't know how. I used a calculator and it doesn't show the steps. Can you please show the steps on how it's 18k?

Click here to see answer by josgarithmetic(39623) About Me 

Question 990100: Evaluate:x^2-2(x-3) when x=3
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Question 990099: What is (32-20)÷4

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Question 990142: If f(x)=2x-5 and g(x)=1+x^2, then what is equal to f(g(3))?
a. 2 *radical sign* 2-5
b. 2
c. 10
d. 15
e. 16

Click here to see answer by josgarithmetic(39623) About Me 

Question 990359: The work sheet ask to replace each • with <,> , or = to make a true sentences. Ex. 3/10 • 2/9
So which is greater or lesser.

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Question 990452: What is a algebraic expression for 12x
Click here to see answer by ikleyn(52832) About Me 

Question 990604: I need to translate 1/5 of a number K into an algebraic expression
Click here to see answer by Timnewman(323) 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