Saturday
April 19, 2014

Homework Help: Math: Arithmetic

Recent Homework Questions About Arithmetic

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Science/Math
The boat's northbound distance = 3(3600) m = 10800 m or 10.8 km then the distance going southeast = 2(45)(60) = 5400 m or 5.4 km Did you make a sketch? Mine is a triangle with sides 10800 and 5400 with a 45° angle between them a) the total distance traveled is simply ...
Monday, September 30, 2013 at 1:15pm

Math
label your results, such as prob(red) = 20/45 = 4/9 prob(yellow) = 5/9 (don't just write down some arithmetic calculations, e.g. what is 25*20 = 500 supposed to represent ) here is all you need Prob(2 reds) = (20/45)(19/44) = 19/99 explanation: prob(first red) = 20/45 ...
Sunday, September 29, 2013 at 8:24am

SAT math
There are y+16 integers. We just want to sum an arithmetic sequence where a = -15 d = 1 and find how many terms there are: (y+16)/2 (-30+(y+15)*1) = 70 y = 19 So there are 19+16=35 terms
Saturday, September 28, 2013 at 3:55pm

math
x, y, 3y If the average (arithmetic mean) of the 3 numbers above is 3x and x≠0, What is y in terms of x?
Saturday, September 28, 2013 at 12:30pm

math
x, y, 3y If the average (arithmetic mean) of the 3 numbers above is 3x and x≠0, What is y in terms of x?
Saturday, September 28, 2013 at 11:41am

arithmetic
46
Friday, September 27, 2013 at 2:31am

arithmetic
46
Friday, September 27, 2013 at 2:15am

calculus and vectors
As you can see, it is virtually impossible to draw a figure in this format. I assume you can sketch a position diagram and a vector diagram of the problem. My vector diagram has a vertical line of 35 N the top angle is 34° (90-56)° the bottom angle is 45° and the ...
Friday, September 27, 2013 at 12:02am

algebra 1
since the terms alternate between positive and negative there is no way there can be a constant difference between terms. So, NOT arithmetic. T0 = 12 Tn = (-1)^n * (12-3n) for n>0 |Tn| is arithmetic.
Tuesday, September 24, 2013 at 8:46pm

algebra 1
Tell whether the sequence is arithmetic. If the sequence is arithmetic, write a function rule to represent it. 12, –9, 6, –3, ...
Tuesday, September 24, 2013 at 5:45pm

Calculus - Taylor #2
Looks good, assuming your arithmetic is ok.
Tuesday, September 24, 2013 at 4:24am

arithmetic
1/2 in/chart * 40000 charts = 20,000 in Of course, that doesn't answer the question in any way. How high are the charts stacked?
Monday, September 23, 2013 at 1:08pm

algebra
I need to find the first five terms in the arithmetic sequence in an =(2)^n-1 n=1 I don't know now to type the n's smaller.
Saturday, September 21, 2013 at 1:48am

arithmetic
find the cost of 100grams of rice per 1/2 a kilogram
Thursday, September 19, 2013 at 3:03pm

arithmetic
28000*(1.05)^33
Thursday, September 19, 2013 at 3:03am

arithmetic
28,000 X .05% compounded for 33 years =
Thursday, September 19, 2013 at 2:46am

math
This is just arithmetic, just plug in the values e.g b) when x = 5 y = 12 + .4(5) = 12 + 2 = 14 do the others the same way
Wednesday, September 18, 2013 at 10:34pm

arithmetic
Subtract: 11.8 - 8.8 = 3.0 miles
Sunday, September 15, 2013 at 8:30pm

arithmetic
If I WALK FROM MARKER 8.8 MILE TO MARKER 11.8 MILE HOW FAR IS THAT?
Sunday, September 15, 2013 at 8:26pm

Math
Alpha writes the infinite arithmetic sequence 10, 8, 6, 4, 2, 0... Beta writes the infinite geometric sequence 9, 6, 4, 8/3, 16/9,... Gamma makes a sequence whose n^th term is the product of the n^th term of Alpha's sequence and the n^th term of Beta's sequence: 10*9,8...
Sunday, September 15, 2013 at 12:49pm

Quantum physics
@ Lord The circuit is a phase change (Z) with a Hadamard (H); plug in the eqn (simple arithmetic if u understand the material) TY for ans tho, wish i knew how u arrived to it, i wrote out all the y's and i couldnt figure out s
Sunday, September 15, 2013 at 12:28am

Math
1. Select the first five terms in the arithmetic sequence an= 2 n , starting with n =1 A. ( 1 / 2 , 1/4 ,1/6, 1/8, 1/10) B. ( 1 , 2 , 3 , 4 , 5 ) C. ( 3 , 4 , 5 , 6, 7 ) D. ( 2 , 4, 6 , 8, 10 ) My answer is D. 2. Select the first five terms in the geometric sequence an = ( 2...
Saturday, September 14, 2013 at 12:57pm

Math - Averages
Six dogs have an average(arithmetic mean) weight of 55 pounds. If the heaviest dog weighs 100 pounds, the lightest dog weighs 5 pounds, and the second-lightest dog weighs 30 pounds, what is the average weight of the other 3 dogs in pounds?
Friday, September 13, 2013 at 11:38am

Math - Averages
The test average for Louis' calculus class is found by taking the arithmetic mean of his four best test scores. If his first four test scores are 65,82,76 and 87, what score must he get on the fifth test to raise his test average to an 85?
Friday, September 13, 2013 at 11:04am

Algebra 1 (Ms. Sue)
Yes, they are right. 5/6x - 1/3 = 5/2 5/6x = 5/2 + 1/3 5/6x = 15/6 + 2/6 5/6x = 17/6 x = (17/6) / (5/6) x = (17/6) * (6/5) x = 102/30 = 3 2/5 Check my arithmetic
Wednesday, September 11, 2013 at 10:38pm

Algebra
I just went over my arithmetic and still get 4,500. How did you get 5500?
Friday, September 6, 2013 at 12:58pm

MaTh
I see it as (3 + 13 + 23 + + 993) + (7 + 17 + ... + 997) two arithmetic series, there are 100 terms in each series with a= 3 and d = 10 and a=7 and d=10 using : sum= (n/2)(first + last) sum = (100/2)(3+993) + (100/2)(7+997) = 100,000
Tuesday, September 3, 2013 at 9:33am

MaTh
Let a_1, a_2, . . . , a_10 be an arithmetic sequence. If a_1 + a_3 + a_5 + a_7 + a_9 = 17 and a_2 + a_4 + a_6 + a_8 + a_{10} = 15, then find a_1.
Monday, September 2, 2013 at 3:03pm

Introduction to Physical Science
I'm missing something or you are. Arithmetic is what you use BUT the answer is not O-16 remains. O has 8 protons + 8 neutrons. That is O16. If you take two protons away, that leave 8-2=6 protons which is carbon or C. Taking two neutrons away gives 8-2=6. The six protons + ...
Wednesday, August 28, 2013 at 5:10pm

Maths
n-th member in AP an = a1 + ( n - 1 ) d d = the difference between successive terms In this case : a11 = a1 + ( 11 - 1 ) d a11 = a1 + 10 d = 18 18 = 3 + 10 d Subtract 3 to both sides 18 - 3 = 3 + 10 d - 3 15 = 10 d Divide both sides by 10 15 / 10 = 10 d / 10 1.5 = d d = 1.5 ...
Wednesday, August 28, 2013 at 5:09am

arithmetic
x+12 = 3(x-4)
Tuesday, August 27, 2013 at 12:50pm

arithmetic
after 12 years, ria will be 3 times as old as she was 4 years ago. find her present age.
Tuesday, August 27, 2013 at 11:59am

arithmetic
write a number sentence to show how to solve the problem.
Monday, August 26, 2013 at 7:22pm

mathematics
the arithmetic mean of x,y and z is 6 while that of x,y,z,t,u,v and w is w. Calculate the arithmetic mean of t,u,v and w.
Saturday, August 24, 2013 at 10:45am

math
the arithmetic mean of x,y and z is 6 while that of x,y,z,t,u,v and w is 9. Calculate the erithmetic mean of t, u, v and w
Saturday, August 24, 2013 at 10:29am

arithmetic
46
Monday, August 19, 2013 at 9:23pm

MaTh
the answer is correct, but your equation is wrong 3x-2 + x = 30 4x = 32 Take a look at your arithmetic. The equations don't add up.
Monday, August 19, 2013 at 6:48pm

math
Find the prime factors. http://www.mathwarehouse.com/arithmetic/​numbers/prime-number/prime-factorization​-calculator.php
Tuesday, August 13, 2013 at 9:06pm

arithmetic
http://www.google.com/webhp?source=searc​h_app#bav=on.2,or.r_qf.&fp=e1f935c9ca2db​b92&q=7.86x+4.6%3D
Monday, August 12, 2013 at 6:06pm

arithmetic
7.86x 4.6=
Monday, August 12, 2013 at 5:45pm

maths
Using the exponent rule a^n * b^n = (ab)^n (1-x)^6 (1+2x)^6 = (1 + x - 2x^2)^6 but (1-x)^6 = 1 - 6x + 15x^2 - 20x^3 + 15x^4 - 6x^5 + x^6) and (1+2x)^6 = 1 + 12x + 60x^2 + 160x^3 + ..) now considering only those multiplications that result in x^3 .... (1 + x - 2x^2)^6 =(1-x)^6...
Thursday, August 8, 2013 at 10:07am

Calc
Let the radius be r and the height be h inches V= πr^2 h h =6/(πr^2) SA = 2πr^2 + 2πrh = 2πr2 + 2πr(6/(πr^2) = 2πr^2 + 12/r d(SA)/dr = 4πr - 12/r^2 = 0 for a max or min 4πr = 12/r^2 4πr^3 = 12 r^3 = 3/π r = ... sub ...
Wednesday, August 7, 2013 at 11:04am

arithmetic progression
9th term = 52 ---> a + 8d = 52 12th term = 70 --> a + 11d = 70 subtract them 3d = 18 d = 6 then a+48 = 52 a = 4 20th term = a + 19d = 4 + 114 = 118
Tuesday, August 6, 2013 at 9:19am

arithmetic progression
the 9th term of an AP is 52 while the 12th term is 70. find the sum of it's 20th term?
Tuesday, August 6, 2013 at 8:19am

math
f y=0 --> 503?/208 = appr 24 to be exact 24*208 = 4992 , so y ≠ 0 if y = 1 --> 513?/218 = appr 24 24*218 = 5232 , so y≠1 y=2 --> 523?/228 = 23 23*228 = 5244 , so y≠2 y=3 --> 533?/238 = appr 22 22*238 = 5236 , so y≠3 y = 4 --> 543?/248 = ...
Saturday, August 3, 2013 at 9:01pm

arithmetic errror - go with Steve Math, Geometry
made a silly error ... (√3/2)x^2 = 2/√3 3x^2 = 4 x^2 = 8/3 x = √8/√3 I also read your area of the triangle as 2/√3 whereas Steve took it as 2√3
Saturday, August 3, 2013 at 12:01am

Algebra/Number Theory
In a sequence of four positive numbers, the first three are in geometric progression and the last three are in arithmetic progression. The first number is 12 and the last number is 452. The sum of the two middle numbers can be written as ab where a and b are coprime positive ...
Tuesday, July 23, 2013 at 1:29pm

trig
If you are using the parallelogram method where the resultant (r) is the diagonal, you should have r^2 = 12^2 + 17^2 - 2(12)(17)cos 120° = 637 r = √637 = appr 25.24 knots let Ø be the angle between the resultant r and the first tug boat, then sinØ/17 = ...
Sunday, July 21, 2013 at 11:38pm

math
bob make 720 telephone calls each year. what is the average (arithmetic mean) number of calls that bob makes per month 60 70 80 100 120
Tuesday, July 16, 2013 at 3:38pm

Math
http://www.mathwarehouse.com/arithmetic/​numbers/prime-number/prime-factorization​.php?number=2002#primeFactorization
Monday, July 15, 2013 at 5:36pm

analytic geometry
let the end point be (x,y) for the x-coordinate: (x+1)/(2+1) = 3/1 x+1 =9 x = 8 for the y-coordinate: (y-4)/(-2-4) = 3/1 y-4 = -18 y = -14 one end point is (8,-14) we could have extended it the other way ... (x-2)(-1-2) = 3/1 x-2 = -9 x= -7 (y+2)/(4+2) = 3/1 y+2 = 18 y = 16 in...
Sunday, July 14, 2013 at 7:07am

Algebra1 HELP PLEASE
write in standard form .... x^2 - 7x - 6 = 0 x = (7 ± √(7^2 - 4(1)(-6)) )/2 you finish the arithmetic you should get : x = 7.8 or x = -.8
Friday, July 5, 2013 at 10:55am

heeeeeeeelp math
Given ΔABC, A=20° B=80° => C=80° => isosceles triangle with base BC=x. Let E=mid-point of BC, then ΔAEC is a right triangle right-angled at E EC=x/2 By definition of cosine, AC=(x/2)/cos(80°) =x/(2cos(80°)) Consider ΔADC, AD=x (given...
Friday, July 5, 2013 at 10:51am

Algebra1 HELP PLEASE
You are right, 4 units over from -1 is 3 sorry about the silly arithmetic error. midpoint between (-1,) and (7,0) is (3,0) x = 3
Wednesday, July 3, 2013 at 5:15pm

Please help with Calc problem??
ok, that's better make a sketch of the situation, labeling the angle as Ø and the height as h, and the hypotenuse c. preliminary: when h = 4000 c^2 = 2500^2 + 4000^2 c = 4716.99 tanØ = 4000/2500 = 1.6 Ø = 57.995° at that moment: we have a similar ...
Wednesday, July 3, 2013 at 11:25am

Calculus
given: r = h/2 V = (1/3)π r^2 h = (1/3)π (h/2)^2 (h) = (1/12) π h^3 dV/dt = (1/4)π h^2 dh/dt for the given data ... 10 = (1/4)π(25)dh/dt dh/dt = 10(4)/((25π) = 1.6/π feet/min check my arithmetic
Tuesday, July 2, 2013 at 10:59pm

probability
The experimental probability of multiple births is #of multiple births/total # of births =(68339+1337)/3612258 =1.9% (approx.) Check my arithmetic.
Tuesday, July 2, 2013 at 8:16am

(Math)Simplifying using the laws of exponents
multiply: add exponents raise to power: multiply exponents (x^3/4 y^1/3)^2/3 = x^(3/4*2/3) y^(1/3*2/3) = x^1/2 y^2/9 (x^-1/3 y)(x^1/2 y^-4/3) = x^(-1/3 + 1/2) y^(1 - 4/3) = x^1/6 y^-1/3 = x^1/6 / y^1/3 (4a^2 b^-7/2)^1/2 = 4^1/2 a^(2*1/2) b^(-7/2*1/2) = 2a b^(-7/4) = 2a / b^7/4...
Monday, June 24, 2013 at 5:08am

Physics
A=[5,-6.5] B=[-3.5,7] If A is perpendicular to C, then A.C=0, or C=[6.5k, 5k] (verify that A.C=0) If in addition, C.B=15, we have C.B=[6.5k,5k].[-3.5,7] =35k-22.75k =12.25k But C.B=15, therefore 12.25k=15, => k=15/12.25=60/49 Therefore C=[6.5k,5k] =[390/49, 300/49] Check my...
Sunday, June 23, 2013 at 6:35am

Math (Geometric Progression)
5 distinct positive reals form an arithmetic progression. The 1st, 2nd and 5th term form a geometric progression. If the product of these 5 numbers is 124 4/9, what is the product of the 3 terms of the geometric progression? Note: The phrase "form an arithmetic ...
Saturday, June 22, 2013 at 3:08am

Calculus
An arithmetic progression has terms a8 =23 and a20 =83 . What is the value of the term a12
Tuesday, June 18, 2013 at 10:13am

arithmetic
there is a unique number of which the square and the cube together use all numbers from 0 up to 9 exactly once. which number is this ?
Tuesday, June 18, 2013 at 12:34am

Maths
a) for arithmetic: t3 = a+2d = 4/3 t6 = a+5d = 9 subtract them 3d = 23/3 d = 23/9 then a+2(23/9) = 4/3 a = -34/9 first 6 terms are: -34/9, -11/9 , 4/3 , 35/9 , 58/9 , 9 well, that checked out ok b) for geometric t3 = ar^2 = 4/3 t6 = ar^5 = 9 divide them r^3 = 27/4 = 54/8 , so ...
Monday, June 17, 2013 at 10:59pm

Maths
The third term of a sequence is 2(2/3) and the sixth term is 9. Find the first six terms when the sequence is; (a) arithmetic (b) geometric
Monday, June 17, 2013 at 9:38pm

Arithmetic Sequence Help!
All you need to find is a and d he first thing to do is use the formulas correctly, and use all the data given: S3 = 3/2 (2a + 2d) = 165 T2 = a+d = 11a So, d = 10a 3/2 (2a+20a) = 165 22a = 110 a = 5 d = 50 The sequence starts 5 55 105
Monday, June 17, 2013 at 2:49pm

Arithmetic Sequence Help!
The sum of 3 consecutive terms of an arithmetic sequence is 165. The second of these terms is 11 times the first. Find the 3 terms From what I gathered: S(3) = 165 t(2)= 11(t1) The given formulas are: Sn= n/2[2a+(n-1)d] and tn=a+(n-1)d I have no idea how to continue.
Monday, June 17, 2013 at 2:25pm

Maths
How to find Geometric mean if arithmetic and harmonic mean is given, The question is AM = 2700 and HM = 75, then find GM ?
Saturday, June 15, 2013 at 1:17pm

math
Study these sites carefully. http://www.slideshare.net/sondrateer/fra​ctions-1196964 http://www.math.com/school/subject1/less​ons/S1U4L3GL.html https://www.khanacademy.org/math/arithme​tic/fractions/Adding_and_subtracting_fra​ctions/v/adding-and-...
Wednesday, June 12, 2013 at 7:54pm

maths
find the 20th term of an arithmetic progression whose 6th term is 3 and 14th term is 19
Wednesday, June 12, 2013 at 4:18am

maths
find the 20th term of an arithmetic progression whose 6th term is 3 and 14th term is 19
Wednesday, June 12, 2013 at 4:16am

math
In a monic polynomial, the leading coefficient is 1 So let f(x) = x^4 + ax^3 + bx^2 + cx + d f(1) = 1 +a+b+c+d = 10 a+b+c+d = 9 , #1 f(2) = 16 + 8a + 4b + 2c + d = 20 8a + 4b + 2c + d = 4 , #2 f(3) = 81 + 27a + 9b + 3c + d = 30 27a + 9b + 3c + d = -51 , #3 #2-#1: 7a + 3b + c...
Tuesday, June 11, 2013 at 2:37am

math
ok then, (n^3−3)/n^3 + (n^3−4)/n^3 + (n^3−5)/n^3+…+ 4/n^3 + 3/n^3=169 (n^3−3) + (n^3−4) + (n^3−5)+…+ 4 + 3 =169n^3 The left side is an arithmetic series where a = n^3 - 3 , and d = -1 we don't know how many terms, let the ...
Monday, June 10, 2013 at 12:47pm

Number Theory
In a monic polynomial, the leading coefficient is 1 So let f(x) = x^4 + ax^3 + bx^2 + cx + d f(1) = 1 +a+b+c+d = 10 a+b+c+d = 9 , #1 f(2) = 16 + 8a + 4b + 2c + d = 20 8a + 4b + 2c + d = 4 , #2 f(3) = 81 + 27a + 9b + 3c + d = 30 27a + 9b + 3c + d = -51 , #3 #2-#1: 7a + 3b + c...
Monday, June 10, 2013 at 7:51am

math
my arithmetic error 144 - 81 = 63 , not 108 so height = √63 = 3√7 = 7.937 area = (1/2)(18)(3√7) = 71.435
Sunday, June 9, 2013 at 11:41am

Math
1. One of the formulas for finding the partial sum of an arithmetic sequence is Sn = n(a1 + an) True 2. The value of a probability must be in the interval [0, 1]? True
Friday, June 7, 2013 at 3:13pm

Math
1. Find the sum of the first 21 terms of the arithmetic sequence given by the formula an = n+5 I see that I have to plug in numbers and get the terms...but i'm sure there's a shorter way to do this instead of plugging in 21 numbers. 2. The following infinite geometric ...
Friday, June 7, 2013 at 11:24am

Fractions and Integers
Modular arithmetic..
Wednesday, June 5, 2013 at 4:20pm

Math
In a right triangle, there is arithmetic sequence. If the shortest side is 15 cm long, what is te length of the other 2 sides. ( hint use pytageron Therom)
Tuesday, June 4, 2013 at 9:44am

Math
In a right triangle, there is arithmetic sequence. If the shortest side is 15 cm long, what is te length of the other 2 sides. ( hint use pytageron Therom)
Tuesday, June 4, 2013 at 9:43am

math
The only right triangle that I know of which has the side lengths form an arithmetic sequence is (3,4,5) or multiples thereof. If the 8 cm leg is the shortest side, then we can find the remaining sides by proportions, namely 8 cm, 8*4/3=32/3, 8*5/3 = 40/3 If the 8 cm side is ...
Monday, June 3, 2013 at 5:20pm

math
The lower leg of a right triangle is 8 cm in length. Calculate the other two knowing that the sides of the triangle form an arithmetic sequence. please give me step by step answers thanks
Monday, June 3, 2013 at 4:22pm

Math question
In an arithmetic series, the 15th term is 43 and the sum of the first 15 terms is 120. Add the first 20 terms of the series.
Sunday, June 2, 2013 at 7:41pm

arithmetic
Did you read your other post? http://www.jiskha.com/display.cgi?id=137​0132243 Set up a table of outcomes and the corresponding probabilities to create the probability distribution. For example, the lowest outcome is X=2 (=1+1) with probability 1/36. then X=3 (1+2 or 2+1...
Sunday, June 2, 2013 at 7:06pm

arithmetic
HOW? CAN YOU SHOW?
Sunday, June 2, 2013 at 4:59pm

arithmetic
Set up a table of outcomes and the corresponding probabilities to create the probability distribution. For example, the lowest outcome is X=2 (=1+1) with probability 1/36. then X=3 (1+2 or 2+1) with probability 2/36 ... X=12 (=6+6) with probability 1/36. Find the mean using E(...
Sunday, June 2, 2013 at 12:30pm

SAT math
3. Find the maximum y- value of the following quadratic function: f(x)= -2x^2 + 7x + 1 The maximum value of the y value is obtained from the vertex the x of the vertex is -b/(2a) = -7/-4 = 7/4 y = -2(49/16) + 7(7/4) + 1 = 57/8 4. 4x/3 + 1/2 = 5y/6 multiply each term by 6 8x + ...
Sunday, June 2, 2013 at 12:19am

arithmetic
Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 = 1/36 Consider a ...
Saturday, June 1, 2013 at 8:17pm

arithmetic
Assume you have an unfair coin - the one that lands heads with probability P (not known beforehand). You have rolled such a coin 20 times and got 16 heads and 4 tails. What is the best estimator of P, Pˆ? (Hint: it is the one based on sample mean.)
Saturday, June 1, 2013 at 8:16pm

arithmetic
Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 = 1/36 Consider a ...
Saturday, June 1, 2013 at 8:15pm

arithmetic
thank you!!! :)
Friday, May 31, 2013 at 8:14am

arithmetic
Thank you god, so much easier this way....I was dying, thinking " There has got to be an easier way to handle this..lol.....THANK YOU!!!!!
Friday, May 31, 2013 at 7:26am

sat math
1. This is just an arithmetic sequence. S34 = 34/2 (2(96)+33(-2)) = 2142 2. At the end of year n, A = 35000(1+.06n) 3. 1.21x = 62.81
Wednesday, May 29, 2013 at 3:17pm

mathematics
The arithmetic mean of x y and z is 6 while x y z t u v and w is 9 calculate the arithmetic mean of t u v and w.
Monday, May 27, 2013 at 3:53pm

Calculus
intersection points: x^2 - 4x + 5 = 2x-3 x^2 - 6x + 8 = 0 (x-2)(x-4) = 0 x = 2 or x = 4 in that domain, the effective height of the region is 2x-3 - (x^2-4x+5) = -x^2 + 6x - 8 area of region = ∫(-x^2 + 6x - 8) dx from x = 2 to x = 4 = [ -x^3/3 + 3x^2 - 8x] from 2 to 3...
Monday, May 27, 2013 at 9:29am

Sequences
Let the nth term of the arithmetic sequence be t(n)=ax+b then t(1)=a(1)+b=7 t(2)=a(2)+b=12 Subtracting, we find 2a-a=12-7 which gives a=5 Substitute back into the formula, t(1)=5(1)+b=7, so b=2 the complete rule is then t(n)=5x+2 The nineteenth term is therefore t(19)=5*19+2=...
Saturday, May 25, 2013 at 11:03am

How to get quick responses to your math questions
Math is a wide subject, ranging from K to 11, college and university. Then there is algebra, trigonometry, geometry, arithmetic, calculus, number theory, ... etc. Not all teachers answer all math questions (many do). If you would give a little more detail on which branch of ...
Saturday, May 25, 2013 at 9:45am

Algebra
80. Determine the sum for the arithmetic series: n = 37, t1 = 23, t37 = 203 a. 5631 b. 8362 c. 6742 d. 4181 81. Determine the sum for the arithmetic series: n = 100, t1 = 17, t100 = 215 a. 9900 b. 3350 c. 11,600 d. 990 82. Determine the sum for the geometric series: n=10, r=-2...
Tuesday, May 21, 2013 at 1:38pm

Math
Please help. 51. Solve: 125=(x3)/0.3^-3 a.7 b.14 c.15 d.9 53. 49x-2 = 7Ö 7 a.-5/4 b.5/4 c.11/4 d.-11/4 60. Simplify: 2log^3 6 - log^3 4 a.3 b.6 c.4 d.2 61. Solve the equation: logb (x^2 + 7) = 2/3logb 64 a.9 b.3 c. √23 d. ±3 62. Solve: (The fifth root of x) ...
Tuesday, May 21, 2013 at 1:29pm

For Anubhav
I made a sketch of triangle ABC drew in the bisector of angle A and drew the altitude AM In triangel ANC NC = 21, angle NAC = 45° 21/sin45 = AC/sinØ sinØ = (sin45)(AC)/21 sinØ = √2 AC/42 in triangle ABN BN = 1, angle BAN = 45° AB/sin(180-&...
Friday, May 17, 2013 at 12:27am

heeeeeelp maths
Let the first point on the x axis be P(x,0), he then goes to Q(x-7,0) and finally to B(9,13) So the path is AP + PQ + QB Distance (D) = √( (x+18)^2 + 64) + 7 + √( (x-2)^2 + 16) dD/dx = ....... = (x+18)/√(x^2 + 36x + 388) + (x-2)/√(x^2 - 4x + 173) . ...
Thursday, May 16, 2013 at 10:17am

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