Thursday
June 20, 2013

# Homework Help: Math: Arithmetic

arithmetic
You buy a square lot that is 154 yd on each side. What is its size in acres?
Saturday, June 28, 2008 at 7:49pm

arithmetic
The question in my test paper asks the following- By making use of the correct order of operations, which of the following three equations (a-c) are possible? a)(35-13)x3 b)35-13x3= c)35-(3x13) I thought the answer would be a)only, but the answer sheet says all of them. Can ...
Tuesday, June 24, 2008 at 10:28pm

arithmetic
Barry and Steve are good friends. Barry wants to buy a new computer, but he doesn't have the money for it right now. Barry says he will pay Steve \$2000.00 in five years if Steve gives him \$1600.00 for the computer today. Steve figures that there is an interest rate of 6% ...
Monday, June 9, 2008 at 5:57pm

Pre Algebra
I don't understand by what they subtract... I'm learning Arithmetic Sequences and here's the sequence: -6, -4 2/3, -3 1/3, -2 By what do they add here?
Thursday, June 5, 2008 at 4:22pm

arithmetic
4mi=how many ft
Wednesday, May 28, 2008 at 4:56pm

I HAVE A MATH TEST TOMORROW HELPPP PLEASE!
im not sure how to find the first four terms of each arithmetic sequence tn=4+(n-1)(3) helpp me pleasee!
Tuesday, May 27, 2008 at 10:53pm

I HAVE A MATH TEST TOMORROW HELPPP PLEASE!
im not sure how to find the first four terms of each arithmetic sequence tn=4+(n-1)(3) helpp me pleasee!
Tuesday, May 27, 2008 at 10:53pm

Math
The sides of a triangle form an arithmetic sequence with a common difference of 2. The ratio of the measure of the largest angle to that of the smallest angle is 2:1. Find the area of the triangle. PLEASE HELP!
Monday, May 26, 2008 at 10:35am

Precalc
The sides of a triangle form an arithmetic sequence with a common difference of 2. The ratio of the measure of the largest angle to that of the smallest angle is 2:1. Find the area of the triangle. Please help!
Monday, May 26, 2008 at 10:34am

arithmetic
Hi can anyone help with fraction?? I want to check my answer: 1 1/2 x 1/4= 3/8 Thank you Ash
Tuesday, May 20, 2008 at 9:10pm

College testing
Im gettin ready to take a placement test for Devry Unviersity. it says Reading , Writing, Arithmetic and Algebra makes up the test. is there any way i can pepare for this test? how long does placement test usually take to complete?
Tuesday, May 20, 2008 at 8:06am

Series
2(a)Consider the arithmetic progression with terms A3=-2 and A12=23. Find the sum of A1+......+A40 (can do) (b)In 1800 the population of England was 8 million. The economist Malthus (1766-1834) produced a hypothesis, suggesting:-that the population of england would increase, ...
Sunday, May 18, 2008 at 9:14am

arithmetic
There are 18 people. There is \$72.00 to split among the top 4 people. How is that figured out?
Tuesday, May 13, 2008 at 2:41pm

arithmetic
what is 10% of 100?
Tuesday, May 13, 2008 at 11:33am

arithmetic
3(p-q)=10 2(p-q)=7 p= q=
Thursday, May 8, 2008 at 4:16pm

arithmetic
how many three-digit integers greater than 500 contain only odd digits
Wednesday, May 7, 2008 at 4:11pm

series
2(a)Consider the arithmetic progression with terms A3=-2 and A12=23. Find the sum of A1+......+A40 (can do) (b)In 1800 the population of England was 8 million. The economist Malthus (1766-1834) produced a hypothesis, suggesting:-that the population of england would increase, ...
Sunday, May 4, 2008 at 5:18pm

Math
2(a)Consider the arithmetic progression with terms A3=-2 and A12=23. Find the sum of A1+......+A40 (can do) (b)In 1800 the population of England was 8 million. The economist Malthus (1766-1834) produced a hypothesis, suggesting:-that the population of england would increase, ...
Sunday, May 4, 2008 at 2:04pm

Maths - Series
1(a)Glasses are piled upon each other to form a tower.The rows are numbered,beginning with the top row.There is a single glass in the top row,two glasses in row number 2,3 in 3;etc.This continues to the bottom of the tower.A tower is needed which uses a maximum of 3200 glasses...
Sunday, May 4, 2008 at 11:20am

arithmetic
Give the place value of 7 in 3,738,500.
Sunday, April 27, 2008 at 8:00pm

Maths
1) In the arithmetic progression, the 8th term is twice the 4th term and the 20th term is 40. Find the common difference and the sum of the terms from the 8th to the 20th term inclusive. 2) Find the least number of terms of the AP, 1+3+5...that are required to make a sum ...
Thursday, April 17, 2008 at 12:26pm

arithmetic
Jenny's mom runs 3 miles 3 times a week . which number sentence can be used to find how many yards she will run in 1 day? A 3 x 3 x 1,760 B 3 x 3 + 1,760 C 3 x 1,760 D 3 + 1,760
Wednesday, April 2, 2008 at 9:14pm

math
The average, that is, the arithmetic mean, age of a group of doctors and lawyers is 40. If the average age of the doctors is 35 and the average age of the lawyers is 50, then what is the ratio of the number of doctors to the number of lawyers?
Wednesday, April 2, 2008 at 8:05pm

arithmetic
I am having a problem with ratio's
Saturday, March 29, 2008 at 8:56pm

arithmetic
How do you solve this problem 1 1/5 minus 3/8?
Tuesday, March 25, 2008 at 4:10pm

arithmetic
picture 12960000cm area. frame 5cm wide. perimeter of frame/
Thursday, March 20, 2008 at 5:54pm

arithmetic
There is going to be a tournament to decide which of 8 football teams is the champion. On the first Saturday the 8 teams will play each other in 4 games. on the second saturday the winners of the first 4 games will play,and on the third saturday the winners from the second ...
Thursday, March 6, 2008 at 12:26pm

arithmetic
There is going to be a tournament to decide which of 8 football teams is the champion. On the first Saturday the 8 teams will play each other in 4 games. on the second saturday the winners of the first 4 games will play,and on the third saturday the winners from the second ...
Thursday, March 6, 2008 at 10:54am

arithmetic
what is an easy way to learn pie
Tuesday, March 4, 2008 at 4:26pm

arithmetic
i have equal amounts of quarters,dimes nickels pennies the value can be any except what 1.23 1.68 2.46
Friday, February 29, 2008 at 12:18am

arithmetic
a triangle with a whole number sides has a perimeter 6 how many sides have the same lenght
Friday, February 29, 2008 at 12:17am

arithmetic
the average degree measure of the angles of a triangle is
Friday, February 29, 2008 at 12:15am

arithmetic
what is the difference between the area and the perimeter of a square with a sidelength 6
Friday, February 29, 2008 at 12:14am

arithmetic
Word Problem: A hospital needs to figure the annual budget for an 11 bed facility based on 90% occupancy using a 4 day length of stay. 1st day = \$625.00, 2nd day - \$315.00, 3rd day = \$315.00 and 4th day = \$220.00. How much money can they expect to make for an entire year?
Wednesday, February 27, 2008 at 2:47pm

arithmetic
i am a multiple of 7.i am a fector of 210.the product of my two digit is odd.
Monday, February 25, 2008 at 2:53am

arithmetic
31/3-22/5
Wednesday, February 20, 2008 at 6:37pm

arithmetic
127/12-514/15
Wednesday, February 20, 2008 at 6:36pm

arithmetic
There are 7 girls on a bus. each girl has 7 backpacks. In each backpack there are 7 big cats. For every big cat there are 7 little cats. Question: How many legs are there in the bus?
Wednesday, February 20, 2008 at 3:00pm

arithmetic
My question is about estimaing products Examples: 1/5 x 26; 1/3 x 4/11; and 4 1/3 x 3 7/8. i can't remember how to multiply these types of problems let alone,estimate the products. Can u please help me to help my son.
Tuesday, February 19, 2008 at 8:23pm

arithmetic
how do you break down a division problem such as 2%734?
Monday, February 11, 2008 at 5:07pm

arithmetic
how do you add fractions with uncommon denominators?
Wednesday, February 6, 2008 at 3:26pm

arithmetic
Write 0.125 as a fraction in simplest form
Tuesday, February 5, 2008 at 6:28pm

Math
Is there a mathematical formula to calculate this easily? 1 x 2 x 3 x 4 x 5...50 I know it's not an arithmetic/geometric series because that means 1 + 2 + 3 + 4 + 5...50
Monday, February 4, 2008 at 7:18pm

URGENT MATHS
I got 2 questions and I've been stuck on them for days and its due in 2 days. 1. For a quick way of doing multiplication, you can do: for example: 81 x 89=? First you do 1x9=9 in which case you have to add '0' in front of it to make it 09. Then you add 1 to any of ...
Friday, February 1, 2008 at 1:36am

PreCal
Write a formula for the general term(the nth term)of the arithmetic sequence. Do not use a recursion formula. Then use the formula for a(n) to find the indicated term of the sequence Find a(11); 12, 10, 8, ... I came up with -10 ?
Tuesday, December 18, 2007 at 6:33am

math
I'm just not good at word problems can someone help pleaes thanks a head of time An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 89, 76, and 65 on the first three exams. Write an inequality representing the score she must ...
Thursday, December 13, 2007 at 11:18pm

math
Hi I need someone to check my answers I'll show whatever work I have but for time purposes I'll just post my answers because I think I have most of them correct. Thanks! 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7. A)143 B)136 C)140 D)133 I ...
Wednesday, December 12, 2007 at 8:53am

Calculus
Write a formuls for the general term(nth term) of the arithmetic sequence. Do not use a recursion formula. Then use the formula for A to the n to find the indicated term of the sequence find a11: 12, 10, 8,...
Sunday, December 9, 2007 at 12:44pm

Math essay
Can you please proofread my essay? My teacher is grading on accuracy, quality, correct spelling and grammer. The History of Mathematics As of today, there are plenty of new developments in the area of Mathematics. In at least some Mathematics courses, it doesn’t cross the...
Tuesday, November 27, 2007 at 6:28pm

Math
Solve the following problem taken from Treviso Arithmetic, a math textbook published in 1478 by an unknown Italian author: A man finds a purse with an unknown number of ducats in it. After he spends 1/4, 1/5 and 1/6 of the amount, 9 ducats remain. It is required to find out ...
Friday, November 16, 2007 at 6:04pm

Calculus - need help!
Use the definition of the derivative to find f'(x) 1. f(x) 2x^2 + x - 1 Before the final step, my 'result' looked weird and I think I did something wrong in my arithmetic...someone correct me? Here's my work... BEGINNING STEP: lim [2(x + deltaX)^2 - (x + deltaX...
Thursday, October 11, 2007 at 1:09am

Sequences...again
Sequence T1 is obtained by adding the corresponding terms of S(sub) and S(sub2). so that T(sub1) = {2.6, 3.39, 4.297, 5.3561, . . .}. We shall write T(sub1) = S(sub1) + S(sub2) to convey the addition of S(sub1) and S(sub2) in this way. Is T(sub1) an arithmetic or geometric ...
Sunday, September 30, 2007 at 3:59pm

Sequences
A = {a1, a1 + d1, a1 + 2d1, …}, B = {a2, a2 + d2, a2 +2d2, …}. Investigate whether A + B and A x B are arithmetic or geometric sequences. If an arithmetic sequence is identified, state its common difference. If a geometric sequence is identified, state its common ...
Sunday, September 30, 2007 at 2:30pm

math-algebra
14. The last term of an arithmetic sequence is 207, the common difference is 3, and the number of terms is 14. What is the first term of the sequence?: A. 165 B. 171 C. 249 D. 168 Please explain. thanks
Wednesday, September 26, 2007 at 1:16am

CALCULUS
If cos(t)=–7/9, find the values of the following trigonometric functions. Note: Give exact answers, do not use decimal numbers. The answer should be a fraction or an arithmetic expression. a) cos (2t) b) sin (2t) c) cos(1/2) d) sin (1/2) i dont even know what this ...
Saturday, September 22, 2007 at 9:38pm

algebra
1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7 a.143 b.136 c.140 d.133 an=a1+(n-1)d a20=3+(20-1)7 a20=3+(19)7 a20=3+133 answer=b 2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15... a.an=n+6 b.an=6n+9 c.an=6n-9 d.an=n-3 an=a1+(n-1...
Sunday, August 26, 2007 at 12:00pm

algebra
I'm pretty sure these are right but I just want to check. 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7 a.143 b.136 c.140 d.133 answer=b 2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15... a.an=n+6 b.an=6n+9 c.an=6n-9 d.an=n...
Sunday, August 26, 2007 at 2:01am

algebra
I'm pretty sure these are right but I just want to check. 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7 a.143 b.136 c.140 d.133 answer=b 2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15... a.an=n+6 b.an=6n+9 c.an=6n-9 d.an=n...
Friday, August 24, 2007 at 5:50pm

algebra(check)
I'm pretty sure these are right but I just want to check. 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7 a.143 b.136 c.140 d.133 answer=b 2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15... a.an=n+6 b.an=6n+9 c.an=6n-9 d.an=n...
Friday, August 24, 2007 at 10:39am

algebra
I'm pretty sure these are right but I just want to check. 1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7 a.143 b.136 c.140 d.133 answer=b 2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15... a.an=n+6 b.an=6n+9 c.an=6n-9 d.an=n...
Thursday, August 23, 2007 at 11:23pm

algebra
1)Use synthetic subsitution to find f(-3)for f(x)=x^4-4x^3+2x^2-4x+6 answer= -15 2)One factor of x^3+2x^2-11x-12 is x+4. find the remaining factors answer= x-1;x-3 3)Which describes the number and type of roots of the equation x^3+121x=0 answer= 1 real root,two imaginary roots...
Friday, August 17, 2007 at 11:26am

arithmetic
this is difficult for me... #5 A carpenter needs 4 boards, each 2 feet 9 inches long. If wood is sold only by the foot, how many feet must he buy? the answer is 11 but how do you get 11? You need to multiply 4 times 2 3/4 to find the total amount of board feet the carpenter ...
Wednesday, August 1, 2007 at 4:11pm

arithmetics
hello can someone help me understand these questions? It's for a test that has arithmetic questions on it and Im trying to study them but I cant do that unless I actually know how to do them. #5 A carpenter needs 4 boards, each 2 feet 9 inches long. If wood is sold only by...
Wednesday, August 1, 2007 at 2:45pm

arithmetic
ok I dont know how to multiply 600x3/8 then subtract it. Could you please show me how. That math place doesnt realy help me. I get 1800/4800 right?? how do i break it down without it taking forever? http://www.jiskha.com/display.cgi?id=118​5664724.1185669166 Basically, ...
Saturday, July 28, 2007 at 8:17pm

arithmetic
The wage rate in a certain trade is \$8.60 and hour for a 40 hour work week and 1 1/2 times the base pay for overtime. An employee who works 48 hours in a week earns? The employee's gross pay (before taxes and other deductions): 8.6 x 40 = a 8.6 x 1.5 x 8 = b a + b = your ...
Saturday, July 28, 2007 at 7:33pm

arithmetic
a stock clerk had 600 pads on hand. He then issued 3/8 of his supply of pads to division X,1/4 to division Y and 1/6 to division Z. The number of pads remaining in stock is? I dont get how to solve this problem. In arithmetic problems, the word "of" indicates that ...
Saturday, July 28, 2007 at 7:18pm

arithmetics
mrs sue you answered my questions yesterday. How do you figure 8 percent of 75? on number 2 can you tell me how 1/3 of an hour is 20 minutes? number 3 how do you times 1 1/2 times \$8.60 i get the 4th one thank you on the last one. Im not sure how to do the math. Another way to...
Thursday, July 26, 2007 at 2:22pm

arithmetic
you can email me if you want i have more. A man owned 75 shares of stock worth \$50 each. The corporation declared a dividend of 8 percent payable in stock. How many shares did he then own? 81 shares but how? If a scow is towed at the rate of 3 miles an hour, how many hours ...
Wednesday, July 25, 2007 at 5:13pm

arithmetics
ok i have a few more questions. this question. If a barrel has a capacity of 100 gallons, how many gallons will it contain when it is two-fifths full? I know its 40 gallons but how and why? this one also. the number of half-pound packages of tea that can be made up from a box ...
Tuesday, July 24, 2007 at 11:34am

How many ml of 0.8M KOH should be added to 5.02g of 1,5 pentatonic acid (H2A) Mwt= 132.11 to give a pH of 4.4 when diluted to 250ml before the first eq point pKa1= 4.345 Is the answer 25.2ml? If that IS correct then I need help b/c I can't get that answer... I've got ...
Monday, July 23, 2007 at 9:52pm

Math/Algebra
In a certain game, each of 5 players received a score between 0 and 100, inclusive. If their average (arithmetic mean) score was 80, what is the greatest possible number of the 5 players who could have received a score of 50? Explain. (A)None (B)One (C)Two The average is ...
Monday, July 23, 2007 at 6:44pm

math
What is the difference between geometric mean and arithmetic mean? Arithmetic mean of two numbers A and B is: (A + B)/2 Geometric mean of two numbers A and B is: sqrt(A*B) The geometric mean can be rewritten as follows: sqrt(A*B) = Exp{Log[sqrt(A*B)]} = Exp{1/2 [Log(A) + Log(B...
Tuesday, July 17, 2007 at 3:40pm

math
what is the sum of all consecutive numbers from 101 to 200, those two numbers inclusive? Halfway between, is 150. Then add 149+151,thence 148+152, and so on till 101+199. Each instance you have 300. So it seems to me... Sum= 200 + 150 + 300*N, where N is the number of pairs ...
Saturday, July 7, 2007 at 11:04am

Algebra II --- Variation, Progression, and theorem
1. If y varies inversely as x, and y = 12 when x = 6, what is K, the variation constant? A. 1⁄3 C. 72 B. 2 D. 144 2. Use the remainder theorem and the factor theorem to determine whether (y – 3) is a factor of (y4 + 2y2 – 4). A. The remainder is 0 and, ...
Friday, June 22, 2007 at 12:00am

Precalculus
Find d of an arithmetic sequence if a(subscript 4)=14 and a (subscript 11)=35 I assume d is the difference between successive terms, since you have said this is an 'arithmetic' sequence. Increasing the subscript by 5 increases the value of the term by 35. That is an ...
Saturday, June 16, 2007 at 8:16am

Precalculus
Find a(subscript 6) of an arithmetic sequ3nce if a(subscript 4)=5 and a(subscript 9)=20. The value of an increases 15/5 = 3 per term. Therefore a4 = 5 a5 = 8 a6 = 11 a7 = 14 a8 = 17 19 = 20 The last term in my previous post should have been labeled a9, not 19.
Saturday, June 16, 2007 at 8:12am

Maths
Carlos is training for the Olympics. His first training session lasted for one hour and he increases each training session by ten minutes every time. After fiteen sessions, how many minutes will be spend training? one hour + 15*1/6 hour. Now multiply by sixty to get minutes. ...
Tuesday, June 12, 2007 at 7:19am

math
help with solving a magic square http://www.jiskha.com/display.cgi?id=112​5461237.1125498843 MAGIC SQUARES Magic squares, those seemingly innocent looking collections of numbers that have fascinated so many for centuries, were known to the ancients, and were thought to ...
Tuesday, June 5, 2007 at 5:19pm

algebra 2
Would some one look at these problems and see if I got them right Thanks Just let me if they are wrong so I can go back over them 1.Write in simplest form 48/56 A. 6/7 2.Multiply 8x^3/5 *10/x^3 A. 16/x^4 3.Divide 4/x^7 / 12/x^3 A. 1/3x^2 4. divide x^2-36y^2/5x^2+30y / (x^26xy...
Friday, June 1, 2007 at 3:34pm

chemistry
How many grams of C6H12O6 need to be dissolved in 350g of water vto have a solution which freezes at -2.50 degrees celcius? delta T = Kf*m You know Kf, m = molality = mols/kg and mols = grams/molar mass, delta T is 2.50. Solve for grams. Post your work if you get stuck. what ...
Thursday, May 31, 2007 at 9:15pm

<Thanks to computers, writing may soon become a lost art.> Leo, a similar prediction is often made about arithmetic since the invention of the calculator. in one of Isaac Asimov writings they discover a man who is actually able to perform an operation like 368 x 4821 ...
Tuesday, May 15, 2007 at 5:35pm

Chemistry
X2 + Y2 <=> 2XY 0.50 mole each of X2 and Y2 are placed in a 1.0 litre vessel and allowed to reach equilibrium at a given temperature. The equilibrium concentrations of XY is found to be 0.025 mol/L. What is the equilibrium cosntant for this reaction? Do I just get the ...
Tuesday, May 15, 2007 at 5:11pm

chemistry
An aspirin tablet weighing 0.548 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
Thursday, May 10, 2007 at 10:08pm

math
Could u help me with this question. The number, N, of people who have heard a rumor spread by mass media at time, t, in days is modelled by N (t) = a / 1+ be^ -kt a. If 50 people have heard the rumour initially and 300,000 people hear the rumour eventually, find a and b b. If ...
Wednesday, May 9, 2007 at 7:10pm

Chemistry``
I answered this question but I did not get the right answer. CO2 + H2 <=> H2O + CO CO2 = 0.5 mole and H2 he 0.5 mole both sollutions were forced into a 1 Litre container. K = 2 what is the equlibrium concentration of each reactant and product. as I calculated I did the ...
Tuesday, May 8, 2007 at 6:31pm

geometric mean
Eighteen is the Geometric Mean of 12 and what number 18 = sqrt (12 x) Solve for x. The answer is an integer, and it isn't 24 (That's the arithmetic mean). cheese is yellow
Monday, May 7, 2007 at 8:25pm

Chemistry
An empty crucible was heated to drive off any volatile impurities and weighed after cooling (see below). A small amount of the green complex iron salt was added to the crucible, weighed again, and then heated gently to remove any waters of hydration loosely bound to the salt. ...
Monday, May 7, 2007 at 2:54pm

Value of lava mass
This question has been posted before, and I amlooking for critque of my answer ..Thanks !!!! The specific heat capacity of the lava is 1600 J kg^-1 degres celsuis ^-1. when all the erupted lava cools from the eruption temperature of 1050 degrees Celsius to 15 degrees celsius, ...
Saturday, May 5, 2007 at 11:06am

Chemistry
Hi, I would like to know if I did this problem correctly. Your help would be greatly appreciated! "Chlorine, Cl2, is produced commercially by the electrolysis of aqueous sodium chloride. The anode reaction is 2Cl-(aq)---> Cl2(g) + 2e- How long will it take to produce 2...
Monday, April 30, 2007 at 9:13pm

math
Ihave to evalaute expressions can someone tell me which whay is the correct way. 15+ 20 ÷ 5 Is 15 + 4= 19 or 5 ÷ 5=9 210-5 x 30 Is it 210-150=60 or 205 x30=61590 Have you heard of BEDMAS? it shows the correct order of operation in arithmetic B-brackets first E-...
Friday, April 27, 2007 at 6:58pm

Chemistry II
Hydrochloric acid (77.0 mL of .267 M) is added to 236.0 mL of .0730 M Ba(OH)2 solution. What is the concentration of the excess H+ or OH- ions left in the solution? Done two of these. They are all alike. Use the template from the previous problem. Post your work if you get ...
Wednesday, April 25, 2007 at 6:26pm

AP Chemistry
This questions has 5 parts but I already have the answers for a and b. I need help on the last three parts. In an electrolytic cell, a current of 0.250 ampere is passed through a solution of a chloride of iron producing Fe(s) and Cl2(g). a) write the equation fot he half-...
Tuesday, April 24, 2007 at 7:29pm

I cannot get my brain around questions like this: 1/4 divided by 2/5 = 2/4 x ? I have 4 problems like this and even the example doesn't make sense - I may have copied it wrong off of the board. Can anyone help? Thank you! You invert the second fraction and then just ...
Monday, April 23, 2007 at 9:59am

CHEMISTRY HELP!!!!!!!!
How many grams of KCl are produced by the thermal decomposition of KClO3 that produces 25mL of O2 at 25 degrees and at 1 atm? A)0.0508 B)0.0762 C)0.0835 D)0.125 what is the anwser and what equation would i use to get the anwser? Write the balanced equation for the ...
Saturday, April 21, 2007 at 11:37pm

Sequence and series
Do you know the difference between a sequence and a series? Graph the terms of an arithmetic series. Remember the domain is the set of natural numbers, not the set of real numbers. What type function do you see? Graph the terms of a geometric series. Remember the domain is the...
Saturday, April 21, 2007 at 4:25am

math,correction
is this correct? simplify: ((1+(2)/(3))/((2+(1)/(2)) My answer: (2)/(3) assuming that 2/3 and 1/2 are separate fractions, 8/3 x 5/2 40/6 20/3 hmm.. perhaps you need to check your arithmetic. unless i'm wrong, which wouldn't be surprising It is hard to read because the...
Friday, April 20, 2007 at 4:59pm

My Retyped Algebra Post
1. Use the arithmetic sequence of numbers 2,4,6,8,10.. to find the following: a)What is d, the difference between any consecutive terms? Answer: Show work in this space: b)Using the formula for the nth term of an arithmetic sequence, what is 101st term? Answer: Show work in ...
Thursday, April 19, 2007 at 5:02am

Chemistry II
A stock solution containing manganese ions was prepared by dissolving 1.542 g pure manganese metal in nitric acid and diluting to a final volume of 1.000L. Calculate the concentration of the stock solution. mols Mn = g/atomic mass Mn. M = mols/L 1.542 g / 54.9 amu Mn = .028 ...
Monday, April 16, 2007 at 10:08pm

math
am I right here the problem is 72divided by8-9 divided by 3 I came up with 72 divided by 8 =9 and 9 divided by 3 =3 so it would be 9-3=6 write your arithmetic this way: 72/8 - 9/3 yes, you are right. thanks
Friday, April 13, 2007 at 5:04pm

Math
How can i make nine equations with the numbers 2, 7 and one other number to equal 8. The first equation should have one as the other number, then two and so on up to 9. I can only use a number once for each expression. I can use arithmetic symbols, decimals, exponents and ...
Tuesday, April 10, 2007 at 10:47pm

Math Concepts
What is the difference between an arithmetic sequence and a geometric sequence? In an arithmetic sequence, the difference between successive numbers is the same. Example: 1, 3, 5, 7, 9.. In a geometric sequence, the ratio of successive numbers is the same. Example: 1, 2, 4, 8...
Monday, April 9, 2007 at 9:55am

math
find the rule for the Nth term of the arithmetic sequence. 11/2, 25/6, 17/6, 3/2, 1/6..... If you change the denomators to 6, you should notice the numerators follow the sequence: 33,25,17,9,1,...which is an arithmetic sequence with a common difference of -8 so term(n) = -8n...
Sunday, April 1, 2007 at 5:49pm

Chemistry
Hw many minutes will it take a current of 31.559 Amperes to deposit 1.722 grams of aluminum? I believe it to be 6.505 minutes Is this correct? If not, I'll post my work. Thanks I found 9.757 minutes. Ok, here's my work, I just plugged in numbers to another problem, I ...
Saturday, March 31, 2007 at 8:44am

Geometry
In what direction must a plane head if it can maintain 350 km/h in still air, wishes to fly 500km in a diirection 040degree and the wind is blowing at 56km/h from 100 degree? howlong would the journey take(to the nearest minutes)? how long would the return journey take, again ...
Friday, March 30, 2007 at 9:41am

principles of finances
according to my interpretation of the question in October they would collect: the 10% of the August sales = .10(\$10,000) the 20% of the Sept sales = .20(\$20,000) and the 70% of the Oct sales = .70(\$30,000) Do the arithmetic and add them up A project has an inital outlay of 4,...
Wednesday, March 28, 2007 at 4:10am

Chemistry
From this equation, how many glocose does the human body consume ineach minute? If gram per mole is 180.16. The human body needs at least 0.0103 mole O2. Equation C6 H12 O6 + 6O2-->6CO2 +6HO2 How many glucose what? grams? moles? tons? Mext, the human body needs at least 0....
Sunday, March 25, 2007 at 10:59pm

chemistry
consider the reaction 2HgCl2 + C2O4-2 ---> 2Cl2-1 + 2CO2 + Hg2Cl2 The initial rate of this reaction was determined for several concentrations of HgCl2 and C2O4-2 and the following rate data was obtained. TRIAL (1) [HgCl2](M)= .105 [C2O4-2](M)= .15 RATE= 1.8 x 10^-5 TRIAL (2...
Sunday, March 25, 2007 at 10:02pm

Chem
A bottle of win contains 12.5% ethanol by volume. The density of ethanol (C2H5OH) is .79 g/mL. Calculate the concentration of ethanol in wine as mass percent and molality. I calculated molality as 2.4 m/kg, but I'm stumped on the mass percent [although I'm hitting the ...
Sunday, March 25, 2007 at 8:47pm

chemistry
I need help with a,b,and c. I tried to balance it but im having a little trouble Ethane gas, C2H6, burns in air and produces carbon dioxide and water vapor. a)write a balanced equation for this reaction. I know this isnt balanced but is this what im working with? C2H6 + O ---&...
Sunday, March 25, 2007 at 5:15pm

Sequence
Find the common difference and a formula formula for the nth term of the arithmetic sequence; 6, 2, -2, -6, -10,...a sub n = a)6-4n b)6-2n c)10-2n d)10-4n I think it is c but want to check. Ao is 10, then each term subtracts 4n from it....n=1, ... well if 6 is equal to the ...
Friday, March 9, 2007 at 12:28pm

math
describe general rule for which fraction that have decimal forms that terminate and which have decimals that repeat and list prime factorizations for each: 1/2 , 1/3, 1/4, 1/5,1/6,1/7,1/8,1/9,1/10,1/11,1/12 how do I do these problems? I searched Google under the key words &...
Wednesday, March 7, 2007 at 8:26pm

Chemistry
Ok, I think I have this one but can you please check my work? A nationally known company markets a product called "cleaning vinegar" that is not designed for human consumption. What is the Mass Percent of acetic acid (HC2H3O2) in this product, if 25 drops of .683 M ...
Monday, March 5, 2007 at 11:16pm

Molarity
A 15.7mL sample of HNO3 reacts to neutralize 27.7mL of 0.187M KOH solution. What is the molarity of the HNO3 solution? HNO3 + KOH ==> KNO3 + HOH mols KOH = L x M = 0.0277 x 0.187 = ?? mols HNO3 = mols KOH (1 mol reacts with 1 mol). mols HNO3 = L x M You have mols HNO3 and L...
Sunday, February 25, 2007 at 10:40pm

The electricity meter on Donna's house read 71,236.4 kwh at the beginning of March and 73,196.2 kwh at the end of March. She pays 7.4 per kwh. What is the amount of her electricity bill for March? Round to the nearest cent. I came up with \$145.03 Would you please check to ...
Saturday, February 24, 2007 at 7:11am

social studies
Why should the 3 R's be rehabilitated? Thank you for using the Jiskha Homework Help Forum. If, by the 3 R's, you mean "Reading, Riting, Rithmetic" you would be illiterate without them. Aside from their being so much enjoyment in reading, what would happen if ...
Sunday, February 11, 2007 at 12:25pm

Algebra
Which one of the basic functions (linear, quadratic, rational, or exponential) is related to the arithmetic series? doesn't arithemetic do something like a constant slope? I think so! ♥☻☺▬M!«5&#​149;ÄUÄ{A']○♥]&#...
Wednesday, January 31, 2007 at 7:16pm

Belinda, Math
I aked the instructor about that problem that looked like this: (w-(1)/(4))^2 and he said that what i thought was right. which was : the answer:w^2-(1)/(2)w+(1)/(6) Yes, that's right. I just thought your way of getting the answer was more complicated than it could have ...
Thursday, January 25, 2007 at 3:46pm

arithmetic
Amelia's parents and grand parents have both opened savings accounts to save for Amelia's education this year. Amelia's parents' savings account earned 5% interest and her grandparents account earned 8% interest. This year the two savings accounts have earned a...
Tuesday, January 23, 2007 at 9:55pm

Precalculus
The 8th term in an arithmetic sequence is 5, and the sum of the first 10 terms is 20. Find the common difference and the first term of the sequence. Alright so in an arithmetic squence the difference d between any two successive numbers is constant. So if the first term is x, ...
Saturday, January 20, 2007 at 11:14pm

chemistry calorimetry
how can i get the mass of a liquid when i'm given the heat enrgy that is added, and the specific heat of the liquid to which is added, plus the increase in temperature. q = mass x specific heat x (Tf - Ti) q is heat in Joules. mass in grams specific heat in J/g*C Tf = ...
Thursday, January 18, 2007 at 10:28pm

chemistry
if 37.9 liters of NO at .993atm and 146 degrees celcius are decomposed by the reaction 2NO-->N2+O2 how many grams of nitrogen will be formed... could you show mw step bu step how to do this ? thanks....i have finals tommorrow.... i need HHHHHHEEEEEEELLLLLLPPPPPPPP PV=nRT P=...
Wednesday, January 10, 2007 at 10:26pm

trigonometry
Hint: The total of angle measurements inside any pentagon is the same. Hint: Look up the mathematical definition of an arithmetic sequence. IF THE MEASURES OF THE ANGLES OF A PENTAGON FORM AN ARITHMETIC SEQUENCE, WHAT ARE THE GREATEST AND LEAST MEASURES EACH ANGLE CAN HAVE? ...
Wednesday, January 10, 2007 at 9:31pm

math
consider the right traingel with sices 3, 4, and 5. the lengths form an arithmetic series. a. what are the other three right triangles in arthimetic series Actually, I think there are an infinite numbr of such triangles. You want to have sides a, b and c such that a < b <...
Thursday, December 21, 2006 at 10:01pm

tricky math
consider the right triangle with sides 3,4,5. Notice that the lengths of the sides form an arithmetic sequence. a. determine three other right triangles wtih side lengths in arithmetic sequence. b.let the sides of a right triangle be a, a+d,a+2d units long. Use the pythagorean...
Thursday, December 21, 2006 at 6:18pm

Math
the sum of the first n terms of an arithmetic series is -51. the series has a constant difference of -1.5 and a first term of four. Find the number of terms in the sum I find using an EXCEL spreadsheet is very helpful for these types of problems. Start with 4 and keep adding 1...
Thursday, December 21, 2006 at 6:14pm

Math
The sum of the first seventeen terms of an arithmetic series is 493 The third term is 11. Find the first term and the seventeenth term. The n-th term is 3*n + 2
Thursday, December 21, 2006 at 3:51pm

Chemistry Questions!!
I was sick for 2 days, and that's really not good in any chemistry class, let alone mine, which is an advanced one. I don't know what I was thinking when I tried to be smart, but I really need help. It's pretty basic, I think, so anyone..? Also, I really have tried...
Wednesday, December 13, 2006 at 9:44pm

Math - Algebra 2
A chemical compound evaporates in a predictable way. In the first hour 1/2 of the amoun in the jar at the beginning of the hour evaporates. In the second hour 1/3 of the amount in the jar at the beginning of the second hour evaporates. In the third hour 1/4 of the amount in ...
Saturday, December 2, 2006 at 12:48pm

math
what is the largest prime number you will need to check to find all the prime numbers less than 100 Here is a site that I found searching Google with the key words, "prime numbers." http://mathforum.org/dr.math/faq/faq.pri​me.num.html I hope this helps. Thanks ...
Wednesday, November 29, 2006 at 12:36pm

Geometry and Discrete Mathematics (Proofs)
Observe that the last two digits of 7^2 are 49, the last two digits of 7^3 are 43, the last two digits of 7^4 are 01, and the last two digits of 7^5 are 07. Prove that the last two digits of 7^201 are 07. 7^2 = ...49 7^3 = ...43 7^4 = ...01 7^5 = ...07 7^201 = ...07 Break 201 ...
Tuesday, November 28, 2006 at 9:29pm

Math
^=exponents /= divide So I am not sure how to do this. It is an example in my book but I still dont get it. Can you work through ti so I can do my real work. (-1^2+-1^-2)^-1 (-1^2+-1^-2)^-1 = First, do work within the parentheses. -1*-1 = 1 and -1-2 = 1/(-12) = [1+(1/(-12)]= [...
Thursday, November 23, 2006 at 7:35pm

chemistry 12
sry, a misprint. its: O2+2F2 <--> 2OF2 The question is looking for Kc. 2.50 mo of oxygen and 2.50 mol of fluorine gas are placed in a 2.00L glass container at room temperature. The container is heated to 400K and the following equilbirum is established: O2+2F2 <-->...
Monday, November 20, 2006 at 8:30pm

Law of Multiple Proportions
Two elements, R and Q, combine to form two binary compounds. In the first compound, 14.0 g of R combines with 3.00 g of Q. In the second compound, 7.00 g of R combines with 4.50 g of Q. Show that these data are in accord with he law of multiple proportions. If the formula of ...
Tuesday, November 14, 2006 at 10:06pm

geometric mean
The geometric mean of two postitive numbers a and b is sqrt(ab). Show that for f(x) = 1/x on any interval [a,b] of positive numbers, the value of c in the conclusion of the mean value theorem is c = sqrt(ab) I have no idea how to do this! If the mean of a and b is sqrt(ab), ...
Sunday, November 5, 2006 at 8:58pm

allgebra
how is linear,quadratic,rational,or exponental realated to arithmetic series 1/4s=4 Hi! Very nice site! Thanks you very much! 9JKlvXKs9AOG Hello! Good Site! Thanks you! balbiammrop
Friday, November 3, 2006 at 7:29pm

Arithmetic Operations
Find a set of 4 distinct positive integers a,b,c,d such that the smallest positive integer that can not be represented by such expressions involving a,b,c,d (instead of 1,2,3,4) is greater than 22.You can use digits exactly once. You are allowed to reuse operators (*, +, -). ...
Friday, November 3, 2006 at 7:22pm

help!
Can you please give me one of them so I cansolve for the other one?PLease! The general formula for a straight line is y = mx + b. Just plug the points into the equation to arrive at two equations. 6=2m+b 10=4m+b you have two equations and two unknowns. Solve them ...
Wednesday, November 1, 2006 at 5:21pm

Algebra
Using the index of a series as the domain and the value of the series as the range, is a series a function? Include the following in your answer: Which one of the basic functions (linear, quadratic, rational, or exponential) is related to the arithmetic series? Which one of ...
Sunday, October 29, 2006 at 11:19am

Math
Using the index of a series as the domain and the value of the series as the range, is a series a function? Include the following in your answer: Which one of the basic functions (linear, quadratic, rational, or exponential) is related to the arithmetic series? Which one of ...
Saturday, October 28, 2006 at 11:19pm

Math
I am to find all possible values of a and b where a, b are positive integers and to show that I have found all of them.For example: "2^3 = 3^1 + 5" is a satisfied equation where(a, b) are (3,1). I know that it can be solved using modular arithmetic but I am NEW to ...
Thursday, October 26, 2006 at 2:14pm

math
can someone help me with prime and composite numbers Prime numbers are counting numbers that can be divided evenly bt only two numbers:1 and themselves. A prime number can also be described as a counting number with exactly two factors, 1 and itself. So, 1 because it has only ...
Tuesday, October 24, 2006 at 12:39am

chemistry
I just need a basic idea as to how to approach these two problems. 1. A 1.020 g sample know to contain only magnesium carbonate, MgCO3, and calcium carbonate, CaCO3, was heated until the carbonated were decomposed to oxides as indicated by the following equations. After ...
Monday, October 23, 2006 at 3:17pm

math...
how can I tell if a sequences is airthmetic, geometric or neither? determine the first three terms of each and determine if each are airthmetic, geometric or neither. 1) tn=5t n-1+ 3 wheret 1=2 first three terms: 3,13,23 airthmetic 2)t(n)= -3(4)^n first three terms:-12,-48,-...
Wednesday, October 18, 2006 at 6:55pm

math!
george entered a function into his calculator andfound the following partail sums s1=0.0016 s2= 0.0096 s3= 0.0496 s4= 0.2496 s5= 1.2496 determine the genral term of the corresponding sequence how would I approach this question? If this is a series then sn is the sum of the ...
Wednesday, October 18, 2006 at 3:31pm

Inorganic Chemistry
The atoms in barium metal are arranged in a body centered cubic unit cell. Calculate the radius of a barium atom in A if the density of barium is 3.50g/cm3. The atomic weight of barium is 137.34. The atoms in barium metal are arranged in a body centered cubic unit cell. ...
Sunday, October 15, 2006 at 7:55pm

English debating
Hi we are doing debates tomorrow and my debate group's topic is "should school be voluntary"? I am 3rd speaker on the negative team and I need help finding information and sources for it please. I would also appreciate some rebuttal tips, thank you. Try the whole...
Tuesday, October 10, 2006 at 11:01pm

math/integers
how do you solve integers? There are about a thousand different types of problems with integers, so it depends on what type of problem. Do you have something specific in mind? In general, modulo arithmetic is used, but it is taught in very few schools these days. Sometimes ...
Tuesday, October 10, 2006 at 11:05am

science - chemistry
Hi everyone, I have been trying to solve these two questions but am having trouble doing so and was wondering if someone could help me out. (1) You wish to make a 0.200 mol/L PIPES buffer (PIPES: 1,4-Piperazine-N,N'-bis(2-ethane-sul​fonic acid), C8H18N2O6S2, pKa = 6....
Sunday, October 8, 2006 at 12:52pm

Math
*Sigh* Can someone explain to me how I would work thru this problem? An honest coin tossed n=3600 times. Let the random variable Y denote the number of tails tossed. (a) find the mean and the standard deviation of the distribution of the random variable Y (b) what are the ...
Thursday, October 5, 2006 at 7:01pm