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Question 469038: Im sorry but I dont know if this question is in the right section!
I am trying to work out ∑ notation questions and failing miserably!
Trying to find the values of x : 15, 16, 16, 18, 20, 25, calculate
i) ∑x
ii)(∑x)2
iii)∑x2
Any help appreciated!
Click here to see answer by Tatiana_Stebko(1539)

Question 469298: can someone pls help me today? i need help by tomorroe
simplify the complex.
4-1/y2 over 2-1/y
Click here to see answer by Alan3354(69443)

Question 469564: A total of 50 juniors and seniors were given a mathematics test. The 35 juniors attained an average score of 80 while the 15 seniors attained an average of 70. What was the average score for all 50 students who took the test?
Click here to see answer by jorel1380(3719)

Question 469618: please help me! can someone pls? :(
solve the equation. check your answers.
3/x-2 - 3/x = 7/x^2-2x
Click here to see answer by ewatrrr(24785)

Question 469810: 1/2+(2/3/3/4)-(4/5*5/6)
Click here to see answer by Tatiana_Stebko(1539)

Question 470650: Please help me solve -6/7 + (-9/4)
Click here to see answer by sofiyac(983)

Question 470827: how to solve this problem,2/3/4/7 * 4/5/3/4 / 1/8/4/9 =
Thank you
Click here to see answer by Tatiana_Stebko(1539)

Question 470982: an unknown number of marbles. 3/8 were yellow,5/16 were green, 7/32 were blue and the remaining 6 were black, how many total marbles are there?

Click here to see answer by jorel1380(3719)

Question 470905: what is -- 48.4 is 16 2/3% of what number ?

Click here to see answer by rfer(16322)

Question 471074: In a survey, 3/16 of people said that they preferred to use self-service gas stations. 5/8 said that they preferred not to pump their own gas. The remaining 75 respondents said that they had no clear preference. How many people preferred self service? Can you please explain to me how to work this problem? Thank you
Click here to see answer by sudhanshu_kmr(1152)

Question 471699: The sum of twice a number and 12 less than the number is the same as the different between -24 and the number. What is the number?
Click here to see answer by mananth(16946)

Question 471697: Solve the equation
-2x+9+7x-2=-5x+10x+11
Click here to see answer by jim_thompson5910(35256)

Question 471735: A father has 8 children. He takes them 3 at a time to zoo as often as he can without taking the same 3 children more than once.
1. How often will he go?
2. How often each child go?
Please solve.
Click here to see answer by sudhanshu_kmr(1152)

Question 471811: (-3x)(6y)

Click here to see answer by stanbon(75887)

Question 471957: 1 < 5x+6 < 600
For how many integer values of x is the given inequality true?
Click here to see answer by richard1234(7193)

Question 472062: how to do (2 1/4)(3 1/3)
Click here to see answer by jorel1380(3719)

Question 472125: If 0 < x <1, then which of the following statements must be true?
I. (1/x)- x > 0
II. x^2 + x^2 < x
III. (x/sqrt(x)) < x^2
A) I only
B) II only
C) III only
D) I and II only
E) I and III only
Thanks!
Click here to see answer by edjones(8007)

Question 472711: how did 7/12 became 5/12? pls. help! tnx so much! ^^
Click here to see answer by Edwin McCravy(20054)

Question 472814: I am not sure I got this right:
Divide and simplify.
(7x-56)/55 divided by (x-8)/33x
I got two different answers, which can't be right.
Click here to see answer by sudhanshu_kmr(1152)

Question 472833: If I am a consultant and I worked 4 hours and 40 minutes and made $350.00, how did I get to the $350.00?
Click here to see answer by ewatrrr(24785)

Question 472860: What is the average (arithmetic mean) of 8, 7, 7, 5, 3, 2, and 2?

Click here to see answer by Alan3354(69443)

Question 472897: 1/28+(-3/4)=?
Click here to see answer by Alan3354(69443)

Question 472997: 21=-3/2(x-2)
Click here to see answer by rfer(16322)

Question 473061: can you arrange numerals 1 to 9 in a single fraction that is exactly one third?
Click here to see answer by Edwin McCravy(20054)

Question 473358: [[4x+6]/[2x+8]] how would you simplify a fraction like this or like [8r^2-8r] / [2r-2]
i dont know if it would be right to simplify but changing [for the first equation] 6 to 3 and 8 to 2 VERY confused
Thank you!!
Click here to see answer by stanbon(75887)

Question 473487: What is the arithmetic mean of 8,7,7,5,3,2 and 2?
Click here to see answer by Alan3354(69443)

Question 473753: 7 1/9 - 4 2/3 I need help solving this I am confused

Click here to see answer by Alan3354(69443)

Question 473809: how do i solve 3/7x-8=6 solve for x.....? please help

Click here to see answer by rfer(16322)

Question 474076: 2 sqrt 5/7 - 3 sqrt 7/5 + sqrt 140
Click here to see answer by Tatiana_Stebko(1539)

Question 474076: 2 sqrt 5/7 - 3 sqrt 7/5 + sqrt 140
Click here to see answer by edjones(8007)

Question 474232: 4/3x-1/2=0
Click here to see answer by rfer(16322)

Question 474458: 12. Determine if the argument is valid or invalid. Give a reason to justify answer.
If it is cold, then you need a coat.
You do not need a coat.
It is not cold.

Valid by the law of detachment
Valid by the law of contraposition
Invalid by fallacy of the converse
Invalid by fallacy of the inverse
Valid by the law of syllogism
Valid by disjunctive syllogism

Click here to see answer by Theo(13342)

Question 474794: i have confusion about how to break down fractions and subtract and multiply.... heres the problem.... 3 1/3-2 2/5=
Click here to see answer by rfer(16322)

Question 474794: i have confusion about how to break down fractions and subtract and multiply.... heres the problem.... 3 1/3-2 2/5=
Click here to see answer by Edwin McCravy(20054)

Question 474814: write 98.809 as a mixed number
Click here to see answer by rfer(16322)

Question 475372: the average of ten diffrent positive integers is 10.the smallest is 5.find the biggest possible number among these ten integers.
Click here to see answer by robertb(5830)

Question 475674: (6f2 - 13 - 11f) � (3f - 4)
Click here to see answer by rfer(16322)

Question 475378: 15th august is a monday. show that after 2^n days there will not be a monday.which are possible days?
Click here to see answer by richard1234(7193)

Question 475377: let (a,b,c) be a primitive pythagorous triplet(a
Click here to see answer by richard1234(7193)

Question 475362: if 2^k-1 is a prime number,then show that 2^(k-1).(2^k-1)is a perfect number.
Click here to see answer by richard1234(7193)

Question 475368: let (a,b,c) be a primitive pythagorous triplet (a
Click here to see answer by richard1234(7193)

Question 475364: let m and n be two consicutive even integers and 1/m+1/n=p/q (in the lowest form) prove that (p, q, q+1) is a pythagorous triplet.
Click here to see answer by richard1234(7193)

Question 476002: simplify to a single fraction:
(If it is possible, may you show me steps. It would really help me to better understand the concept.) Thank you
1.) (1/x+3 + 1/x)/(x)
2.) (x^(2)+7x+12)/(x^(2)-16)
Click here to see answer by lwsshak3(11628)

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