Sunday

April 20, 2014

April 20, 2014

**Recent Homework Questions About Arithmetic**

Post a New Question | Current Questions

**arithmetic**

Yes, 60 mph.
*Saturday, April 19, 2014 at 11:40am*

**arithmetic**

a car traveled a distance of 195 miles in 3 hours 15 minutes what is the unit rate ? oris it answer 60 miles per hour
*Saturday, April 19, 2014 at 11:18am*

**Calculus Help Please Urgent!!!**

I also got 6.09 (actually 6.0895..) I defined the side of the triangle slightly different from Damon to avoid as many fractions as I could. let each side of the square be x m let each side of the equilateral triangle be 2y m that way I can say that the height of the triangle ...
*Friday, April 18, 2014 at 8:20pm*

**Math**

The standard 3by3 magic square is 8 1 6 3 5 7 4 9 2 --> notice ever row, column and diagonal adds up to 15 for a total of 45. Any 9 numbers in an arithmetic sequence can be arranged in the above order and you would have a magic square with the properties you want. change ...
*Wednesday, April 16, 2014 at 4:09pm*

**Algebra 2**

term1= 3(1) - 3 = 0 term2 = 3(2) - 3 = 3 term3( = 3(3) - 3 = 6 .... looks like an arithmetic sequence , with a=0 and d = 3 sum(1) = (10/2)(2(0) + 9(3)) = 5(27) = 135
*Wednesday, April 16, 2014 at 2:09pm*

**calculus help please**

let each side of the square be x m let each side of the equilateral triangle be 2x (that way, the height is √3y, from the ratio of the 30-60-90° triangle) a) for a max area, you are right, all should be used for the square b) 4x + 6y = 14 2x + 3y = 7 x = (7-3y)/4 OR ...
*Tuesday, April 15, 2014 at 11:41pm*

**college Algebra**

let each of the two end fences be x ft long let the side parallel to the river be y ft long so we have: cost = 12y + 8(2x) = 12y + 16x but 12y + 16x = 3600 3y + 4x = 90 y = (90-4x)/3 area = xy = x(90-4x)/3 = 30x - (4/3)x^2 d(area)/dx = 30 - (8/3)x = 0 for a max of area (8/3)x...
*Tuesday, April 15, 2014 at 8:34am*

**Math**

a) ridiculous question ! , makes no sense the "arithmetic" would be 8200(1.0988) = .... b) weekly rate = .0988/52 = .0019 number of weeks in 18 years = 936 amount = 8200(1.0019)^936 = $48,465.24
*Sunday, April 13, 2014 at 10:29pm*

**Calculus**

let the length of the side using bricks be x ft let the other two sides each be y ft given: xy = 900 --> y = 900/x cost = 5(x + 2y) + 10x = 15x + 10y = 15x + 10(900/x) d(cost)/dx = 15 - 9000/x^2 = 0 for min of cost 15 = 9000/x^2 15x^2 = 9000 x^2 = 600 x = √600 = 10&#...
*Sunday, April 13, 2014 at 10:03pm*

**whoops, arithmetic error**

t^2 - 2 t - 3 = -(1/5)(h) t^2 - 2 t = -h/5 + 3 t^2 - 2 t + 1 = -h/5 + 4 (t-1)^2 = -(1/5) (h - 20) so max height at one second of 20 meters
*Sunday, April 13, 2014 at 7:07pm*

**math**

identify the sequence 1.6, .8, .4, .2 as arithmetic, geometric, or neither and why.
*Sunday, April 13, 2014 at 11:09am*

**algebra 2**

sigma upper limit 28 algebraic expression (8i-13) lower limit 1 index=i 28 ∑ 8i-13 i=1 You can see from the formula that the sum increases by 8 with each additional term (8i) The first term is 8*1-13 = -5 Now recall that the sum of the 1st n terms of an arithmetic ...
*Wednesday, April 9, 2014 at 11:54am*

**math**

z-score for the 169 = (169-180)/8 = -1.375 x-score for the 191 = (191-180)/8 = +1.375 look up value for 1.375 and the value for -1.375 subtract the two values You should get .8309 I recommend this webpage for these type of questions. http://www.wolframalpha.com/input/?i=plo&#...
*Wednesday, April 9, 2014 at 7:07am*

**uc-metc math16**

let the length of the chord be y let the horizontal distance of the kite be x ft given: dx/dt = 5 ?? (looks like a typo in the units) I will assume you meant: 5 mph = 5280 ft/60 min = 88 ft/min y^2 = x^2 + 40^2 when y = 50 50^2 = x^2 + 40^2 x = 30 2y dy/dt = 2x dx/dt dy/dt = ...
*Monday, April 7, 2014 at 9:47pm*

**Calculus Help**

y = sin [ pi*(t^2+5)^-.5 ] y' = pi [cos pi*(t^2+5)^-.5] * [-.5(2t)](t^2+5)^-1.5 if t = 2 y' = pi {cos pi/ 3} *[-2] [ 1/27 ] = -(2pi/27) cos (pi/3) but cos pi/3 = 1/2 so -pi/27 CHECK MY ARITHMETIC !!!! =
*Monday, April 7, 2014 at 9:34pm*

**algebra 2**

This produces an arithmetic series, where a = -5 and d = 8 sum(28) = (28/2)(-10 + 27(8)) = 2884
*Sunday, April 6, 2014 at 9:37pm*

**algebra 2**

what is the sum of the first 11 terms of the arithmetic series in which asub one = -12 and d=5
*Sunday, April 6, 2014 at 8:11pm*

**Math**

ds = sqrt (dx^2 + dy^2) dx = -5sin t +5 sin5t dx^2= 25sin^2 t -50sint sin5t+25sin^2 5t dy = 5 cos t -5 cos 5t dy^2= 25cos^2 t-50costcos5t +25 cos^2 5t luckily sin^2 + cos^2 = 1 dx^2+dy^2=50-50(sin t sin 5t+costcos 5t) but sin a sin b + cos a cos b = cos(a-b) = 50 - 50 cos 4 t...
*Saturday, April 5, 2014 at 7:47pm*

**arithmetic**

21.875%
*Wednesday, April 2, 2014 at 7:37pm*

**arithmetic**

Ana sees a computer that costs $1600. The store manager says next week will be on sale $350 less. What percent will Ana save
*Wednesday, April 2, 2014 at 7:35pm*

**trig**

after 1 hours, one ship has gone 25 km, the other 15 km make a sketch, let the distance between them be x straigh-forward case of the cosine law x^2 = 25^2 + 15^2 - 2(25)(15)cos 60° = .... you do the arithmetic. (I got appr 21.8 km)
*Wednesday, April 2, 2014 at 7:18pm*

**PRE CALC**

The 20th term of an arithmetic sequence is 27 and the first term is -11. What is the common difference??
*Wednesday, April 2, 2014 at 7:01pm*

**Calculus Help**

At a time of t min after the plane passed over the tracking telescope, let the horizontal distance be x km Let the angle of elevation be Ø Make a sketch, I get cot Ø = x/6 x = 6cotØ dx/dt = -6 csc^2 Ø dØ/dt when Ø = π/3 and d&...
*Wednesday, April 2, 2014 at 5:06pm*

**Math**

look up "Chinese Remainder Theorem" and you will find many pages for this kind of problem You will have to know how to do arithmetic in "modular arithmetic" , and this forum_search_20140419 is not suitable to teach you that. I just worked out the above ...
*Wednesday, April 2, 2014 at 11:22am*

**arithmetic**

oops. That would be 4,8,12,...
*Tuesday, April 1, 2014 at 4:53am*

**arithmetic**

1,4,8,...
*Tuesday, April 1, 2014 at 4:52am*

**arithmetic**

Select the first five terms in the arithmetic sequence an = 4n, starting with n = 1.
*Tuesday, April 1, 2014 at 1:04am*

**Physics**

Well, it is their word against mine I guess, but check my arithmetic and units carefully Physics - Damon, Sunday, March 30, 2014 at 7:21pm 25 L = 25 * 10^-3 m^3 2.77 cm = .0277 m 1.4 min = 84 seconds flow rate * time = amount pi r^2 v * 84 = .025 m^3 pi (.0139)^2 v = .025 v = ...
*Sunday, March 30, 2014 at 7:48pm*

**Statistics**

For the most recent seven years, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,253; 5,578; 6,406; 7,334; 8,728; 11,298; 15,182. What is the annual arithmetic mean number of degrees awarded? About 9,120 ...
*Thursday, March 27, 2014 at 11:50pm*

**Statistics**

For the most recent seven years, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,253; 5,578; 6,406; 7,334; 8,728; 11,298; 15,182. What is the annual arithmetic mean number of degrees awarded? About 9,120 ...
*Thursday, March 27, 2014 at 10:11pm*

**Statistics**

A stockbroker placed the following order for a customer: • 50 shares of Kaiser Aluminum preferred at $100 a share • 100 shares of GTE preferred at $27.20 a share • 20 shares of Boston Edison preferred at $12.20 a share What is the weighted arithmetic mean price ...
*Thursday, March 27, 2014 at 9:49pm*

**Statistics**

The distribution of a sample of the outside diameters of PVC gas pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 11.0 inches, and the standard deviation is 2.0 inches. About 68 percent of the outside diameters lie between what two amounts? 8....
*Thursday, March 27, 2014 at 9:10pm*

**Calculus Help Please!!!**

One of us made an arithmetic mistake. It is up to Tanya to get it right :)
*Thursday, March 27, 2014 at 9:06pm*

**Calculus Help Please!!!**

rate of change of temp proportional to temp above room temp which is 20 to make it easy on the arithmetic define T' = real T - 20 dT'/dt = k (T') dT/T' = k dt ln T' = k t T' = C e^kt let's call t = 0 at 1:30 T = 32.5 so T' = 12.5 12.5 = C e^0 = ...
*Thursday, March 27, 2014 at 8:54pm*

**Economics and Statistics**

A stockbroker placed the following order for a customer: • 50 shares of Kaiser Aluminum preferred at $100 a share • 100 shares of GTE preferred at $27.20 a share • 20 shares of Boston Edison preferred at $12.20 a share What is the weighted arithmetic mean price ...
*Thursday, March 27, 2014 at 8:07pm*

**Calculus**

Posted by MG on Wednesday, March 26, 2014 at 6:54pm. The hands of a clock in some tower are 4.5m and 2m in length. How fast is the distance between the tips of the hands changing at 9:00? (Hint: Use the law of cosines) The distance between the tips of the hands is changing at ...
*Thursday, March 27, 2014 at 3:36am*

**College Calculus**

Thank you for the response, i tried the method mentioned above three times and was incorrect each time, i double checked all my work to match the method above. The correct answer is always just .3 under the answer All of your arithmetic is right as well, so it is not that. ...
*Thursday, March 27, 2014 at 3:31am*

**College Calculus**

let Ø be the angle between them the angular velocity of the minute hand = 2π/60 rad/min = π/30 rad/min the angular velicity of the hour hand = 2π/(12(60)) or π/720 rad/min then, so dØ/dt = (π/30 - π/720) rad/min dØ/dt = 23&#...
*Wednesday, March 26, 2014 at 8:25pm*

**Maths**

4x+1,2x+4 and x+3 are first three terms of arithmetic sequence determine the value of x
*Wednesday, March 26, 2014 at 10:47am*

**Business & Economics**

For the most recent seven years, the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,033; 5,652; 6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of degrees awarded? About 12,240 ...
*Monday, March 24, 2014 at 1:22pm*

**arithmetic**

interest = 2000(1.0155)^20 - 2000 = 720.37 or "appr" $ 720
*Friday, March 21, 2014 at 11:19am*

**arithmetic**

http://qrc.depaul.edu/StudyGuide2009/Notes/Savings%20Accounts/Compound%20Interest.htm http://www.moneychimp.com/articles/finworks/fmfutval.htm
*Friday, March 21, 2014 at 10:15am*

**arithmetic**

An investment of $2,000 is earning interest at the rate of 6.2% compounded quarterly over 5 years. Approximately how much interest is earned on the investment?
*Friday, March 21, 2014 at 10:11am*

**Calculus Help STEVE**

oops. Well, if you got y', y" is just a bit down the road There are two ways to do it. First, use y' directly: y' = -2x^2 / 3y^2 by the quotient rule, y" = ((-4x)(3y^2) - (-2x^2)(6yy')] / 9y^4 = ((-12xy^2 + 12x^2y(-2x^2/3y^2)) / 9y^4 = -12xy(y - x(-2x...
*Thursday, March 20, 2014 at 6:05pm*

**Math - PreCalc (12th Grade)**

as with any arithmetic progression, Sk = k/2(a1 + ak) = k/2(1+5k-4) = k/2(5k-3) Sk+ak+1 = k(5k-3)/2 + 5k-4+1 (D) Don't forget your algebra I just because you're in pre-calc now.
*Thursday, March 20, 2014 at 1:19pm*

**Algebra ll**

simple yearly interest rate i (percent = 100 i) at n = 1 first year beginning Amount = A second year Amount = A + Ai Third year Amount = A + 2 A i This is an arithmetic sequence with A = starting amount A i = d so Amount = A + d (n-1) recursive Amount n = Amount (n-1) + d ...
*Wednesday, March 19, 2014 at 6:37pm*

**Algebra ll**

Help please, I don't understand how to do this... Give an example of an arithmetic sequence that is found in the real world. Find the common difference and write a recursive and iterative rule for the sequence. Use one of the rules to find another term of the sequence. ...
*Wednesday, March 19, 2014 at 5:46pm*

**PHYSICS**

You are welcome. As always, check my arithmetic.
*Tuesday, March 18, 2014 at 7:23pm*

**physics**

initial momentum = 28000 u final momentum = (m+28000) v so 28000 u = m v + 28000 v initial ke = 14000 u^2 final ke = (14000+.5m)v^2 (14000+.5m)v^2 = .8 (14000 u^2) (14000+.5m)v^2= 11200 u^2 so I have these two equations to work with: 28000 u = m v + 28000 v and 11200 u^2 = (...
*Sunday, March 16, 2014 at 3:39pm*

**Math**

cost of 1st machine = 250000 + 30000( 1 - 1.085^-10)/.085 - 75000(1.085)^-10 = 413,669.04 cost of 2nd machine = 400000 + 225000(1.085)^-5 - 175000(1.085)^-10 = 472,235.27 1st is cheaper, I used the present time as my "focal point in time" check my arithmetic
*Friday, March 14, 2014 at 10:50am*

**Physics**

CHECK MY ARITHMETIC !!! It came out awful coincidental though.
*Wednesday, March 12, 2014 at 6:17pm*

**Physics algebra error**

T = m(9.81)/cos A T sin A = m Ac = m v^2/R where R = 18 sin A so m (9.81) sin A/cosA = m v^2 /(18 sin A) v^2 = 9.81 * 18 * sin^2 A/cos A check my arithmetic !!!
*Wednesday, March 12, 2014 at 5:51pm*

**physics**

momentum = 3 (2) + 18 (0) = 6 before and after so 6 = 3 (u) + 18(v) or 2 = u + 6 v so u = (2 - 6 v) = 2 (1-3v) Ke same before and after: so 3(2^2) = 3u^2 + 18v^2 12 = 3(4)(1-3v)^2 + 18 v^2 2 = 2 (1 - 6v +9 v^2 ) + 3 v^2 0 = -12 v +18 v^2 + 3 v^2 21 v^2 = 12 v 21 v = 12 v = 12/...
*Wednesday, March 12, 2014 at 4:49pm*

**arithmetic**

n lines can intersect in n(n-1)/2 points
*Sunday, March 9, 2014 at 6:59pm*

**arithmetic**

if you 99 lines on a piece of paper so that no two lines are pallarel to each other and no three lines pass through the same point,how many times will they will intersect?
*Sunday, March 9, 2014 at 2:48pm*

**math**

change in volume of tank = (5000)(4400)(21) cm^3 = 462,000,000 cm^3 = 462,000 L 15 km/hr = 1,500,000 cm/hr Volume moved = 1,500,000(49π) cm^3/hr time to fill 462,000,000 = 462,000,000/1,500,000 hrs = 308 hrs check my arithmetic
*Friday, March 7, 2014 at 7:36am*

**4th grade math**

3,5,7, ... arithmetic series.. use the sum formula, set the sum equal to 48, then solve for n.
*Friday, March 7, 2014 at 6:03am*

**math**

21 + 19 + 17 ... a (a+d) (a + 2d) ..... a+7d eight terms where a = 21 and d = -2 arithmetic series sum of first 8 = (8/2) (42 + 7(-2) ) = 4 (42 - 14) = 4 (28) = 112
*Thursday, March 6, 2014 at 11:29am*

**mathematics **

MATHEMATICS PLEASE HELP ME!!! In an arithmetic series the 3rd term is twice the 8th term find the first 25 terms
*Thursday, March 6, 2014 at 10:43am*

**math**

In an arithmetic series the 3rd term is twice the 8th term. Find the sum of the first 25 terms.
*Thursday, March 6, 2014 at 9:40am*

**mathematis**

consider the arithmetic sequence:-4;-1;2;5...if the nth term of the sequence is 74 determine the value of n
*Wednesday, March 5, 2014 at 2:56pm*

**arithmetic **

4/8 = 0.50 4/6 = 0.67
*Tuesday, March 4, 2014 at 9:03pm*

**arithmetic progression**

14
*Tuesday, March 4, 2014 at 11:05am*

**math**

By the way, we know any angle greater than 45 degrees will cause a crash without doing any arithmetic. At 45 degrees the tree is 65 feet high.
*Monday, March 3, 2014 at 4:13pm*

**arithmetic**

a(1-r^8)/(1-r) / a(1-r^4)/(1-r) = 97/81 so, (1-r^8)/(1-r^4) = 97/81 81 - 81r^8 = 97 - 97r^4 81r^8 - 97r^4 + 16 = 0 (r^4-1)(81r^4-16) = 0 r^4 = 1 or 16/81 r = ±1 or ±2/3 Naturally, r=±1 are out, but ±2/3 both work
*Sunday, March 2, 2014 at 11:44am*

**arithmetic**

The ratio of the sum of the first 8 terms of a G.P. to the sum of the first 4 terms of the same G.P. is 97:81, where the common ratio of the G.P. is a real number. What is the common ratio?
*Sunday, March 2, 2014 at 11:31am*

**Calculus Please help!**

let the time be t hours past noon. I see a right-angled triangle , with sides 23t and 50 + 18t, with D as the distance between them D^2 = (23t)^2 + (50+18t)^2 D^2 = 529t^2 + 2500 + 1800t + 324t^2 = 853t^2 + 1800t + 2500 2D dD/dt = 1706t + 1800 dD/t = (853t + 900)/D , #1 at 3:...
*Friday, February 28, 2014 at 5:23pm*

**Calculus Please help!**

Let the radius be r, so the diameter is 2r then the height is 2r V = (1/3)π r^2 h = (1/3) π r^2 (2r) = (2/3)π r^3 dV/dt = 2π r^2 dr/dt when h = 24 2r = 24 r = 12 and dV/dt = 30 30 = 2π (144) dr/dt dr/dt = 30/(288π) = 5/(48π) ft/min or appr ....
*Friday, February 28, 2014 at 4:00pm*

**Calculus Help**

f(x) = 1/[ x^.5 +1 ] f(z) = 1/[ z^.5 + 1 } f(x)-f(z) = 1/[ x^.5 +1 ] - 1/[ z^.5 + 1] = ([z^.5+1]-[x^.5+1])/(x^.5z^.5 +x^.5+z^.5+1) = (z^.5-x^.5) /(x^.5z^.5 +x^.5+z^.5+1) Divide by (x-z) which is (x^.5-z^.5)(x^.5+z^.5) and get -(x^.5+z^.5) / (x^.5z^.5 +x^.5+z^.5+1) let z --->...
*Friday, February 28, 2014 at 1:10pm*

**Math**

arggh, just a lot of arithmetic..... time per day open for rides: 6.5 hours = 390 minutes time available per year = 390(365) = 142350 minutes time needed to complete one ride = 3 + 4 + 3 = 10 minutes. (so they can complete 39 rides per day) number of rides per year = 142350/10...
*Tuesday, February 25, 2014 at 9:44am*

**Algebra**

or 100x/(x+314) = 42 cross-multiply ... 100x = 42x = 13188 58x = 13188 x = 13188/58 = 6594/29 or appr 227.38 I took your * to mean multiplication, the common symbol for multiplication If, somehow, you meant it to be an exponent, that is [x/(x+314)]^100 = 42 then take the 100th...
*Tuesday, February 25, 2014 at 12:31am*

**arithmetic**

7
*Sunday, February 23, 2014 at 4:42pm*

**arithmetic!**

Your school subject is math or arithmetic. 12 * 1.075 * 1.15 = ?
*Thursday, February 20, 2014 at 5:08pm*

**calculus**

Let's just do the quarter of it over the right half 0 < x < 5 and multiply by 2 at the end that means the triangle has base 2y and height 6 everywhere so its Area is (1/2)(2y)(6) = 6y and a slice of volume is 6ydx we need to integrate that from x = 0 to x = 5 (and ...
*Thursday, February 20, 2014 at 3:51pm*

**pre-calculas**

-(x+3)/(x-3)+(12x+4)/(x-3)(x+3) -2x/(x+3) LCD = (x+3)(x-3) which is (x^2-9) so -(x+3)(x+3)/LCD +(12x+4)/LCD- 2x(x-3)/LCD -x^2 - 6x - 9 + 12x + 4 -2x^2 + 6 x all over LCD (-3 x^2 + 12 x -5)/(x^2-9) check my arithmetic
*Sunday, February 16, 2014 at 10:54am*

**Math.G.P**

arithmetic mean of 1st and 3d = (x-2 + x+6)/2 = (2x + 4)/2 = x+2 let the 2nd be y then y/(x-2) = (x+6)/y y^2 = (x-2)(x-6) y = ± √((x-2)(x+6)) mean:2nd = 5:3 (x+2)/√((x-2)(x+6)) = 5/3 square both sides and expand (x^2 + 4x + 4)/(x^2 + 4x - 12) = 25/9 25x^2 + ...
*Friday, February 14, 2014 at 9:28am*

**Math.G.P**

The 1st term of a G.P is equal to x-2,the 3rd term is x+6 and the arithmetic mean of the 1st and 3rd terms stands in the ratio to the 2nd 5:3.find the value of x.
*Friday, February 14, 2014 at 6:13am*

**Harriet Tubman Charter School Bronx NY10456**

Thanks for the help, but I need further explanation to understand the Arithmetic to deal with likely questions in the future. Thanks Mateen
*Monday, February 10, 2014 at 12:51am*

**Arithmetic**

(A) 47+3
*Sunday, February 9, 2014 at 10:15pm*

**Arithmetic**

What is 47 + 3?
*Sunday, February 9, 2014 at 7:41pm*

**pre calculus**

.72 = 1 (e^-.000124t -.000124t ln e = ln .72 but lne =1 t = ln .72 /-.000124 = appr 2649 years check my arithmetic
*Saturday, February 8, 2014 at 11:13pm*

**math**

Select the first five terms in the arithmetic sequence an = 8n, starting with n = 1
*Saturday, February 8, 2014 at 12:56am*

**Math**

889/12 = 74 with remainder 1 961/12 = 80 with remainder 1 1009/12 = 84 with remainder 1 1189/12 = 99 with remainder of 1 So 12 is it! I am not sure if you know anything about modular arithmetic, so I made up a silly little old-fashioned computer program. Here is a listing of ...
*Friday, February 7, 2014 at 9:56pm*

**typo?**

x^2+4??????y^2 ?????+2z^2+2x-4y+z = 20 if so x^2 + 2 x = -(+4y^2+2z^2-4y+z) + 20 x^2 + 2 x + 1 = -(+4y^2+2z^2-4y+z) + 21 (x+1)^2 = -(+4y^2+2z^2-4y+z) + 21 4 y^2 - 4 y = -(x+1)^2 -2 z^2 -z + 21 y^2 - y =(1/4)[-(x+1)^2 -2 z^2 -z + 21] y^2-y+1/4=(1/4)[-(x+1)^2 -2 z^2 -z + 22] 4(y...
*Friday, February 7, 2014 at 4:15pm*

**math**

the fourth term of an arithmetic progression is equal to 3 times the first term and the seventh term exceeds twice the third term by 1 find the first term and the common differrence
*Friday, February 7, 2014 at 8:31am*

**Math:A.P.**

for AP: term1 = a term3 = a+2d term9 = a+8d but term7 = 19 = a+6d so a = 19-6d so re-defining: term1 = 19-6d term3 = 19-6d+2d = 19-4d term9 = 19-6d + 8d = 19+2d these 3 are supposed to be a GP, so (19-4d)/(19-6d)= (19+2d)/(19-4d) 361 - 152d + 16d^2 = 361 -76d - 12d^2 28d^2 - ...
*Thursday, February 6, 2014 at 9:56am*

**Physics**

31 days (24 hr/day)(3600 s/hr) = 2.68*10^6 seconds circumference of orbit = 2 pi r = 23.9*10^8 so v, speed = 23.9*10^8/(2.68*10^6 = 8.91*10^2 m/s Ac = v^2/r = 79.4 * 10^4 / 3.8*10^8 = 20.9 *10^-4 m/s^2 F = m a G Me m/r^2 = m Ac note m moon cancels 6.67*10^-11 Me/14.4*10^16 =20...
*Wednesday, February 5, 2014 at 5:02pm*

**Math**

The sum of the first n terms of an arithmetic series is given by: Sn=5/2n^2 + 7/2n. Determine: 3.2.1 The common difference. 3.2.2 The tenth term
*Sunday, February 2, 2014 at 12:29pm*

**Calculus**

we have two points in that plane (8, 0, -2) and (6, 3, 3) a vector through those points has direction (6-8)i + 3 j + (2+2)k = -2 i + 3 j + 4 k so we have two vectors parallel to plane, their cross product is normal to the plane i j k -2 5 2 the given line direction -2 3 4 the ...
*Friday, January 31, 2014 at 5:35pm*

**Calculus**

going from the first point to the second dx = 3 dy = -2 dz = 4 so my line direction is 3 i -2 j + 4 k and my line in parametric form is (1,0,1) + (3, -2, 4) t at intersection x = 1+3t y = -2 t z = 1+4t and we know x + y + z = 10 2 + 5 t = 10 t = 8/5 so x = 1 + 24/5 = 29/5 y...
*Friday, January 31, 2014 at 4:32pm*

**Calculus**

perpendicular to the direction 1 i - 1 j + 2 k Vxi + Vyj + Vzk if perpendicular dot product is 0 Vx - Vy + 2 Vz = 0 also parallel to plane x+y+z = constant 2 so normal to the normal to that plane 1 i + 1 j + 1 k Vxi + Vyj + Vzk Vx + Vy + Vz = 0 so we have Vx - Vy + 2 Vz = 0 Vx...
*Friday, January 31, 2014 at 4:14pm*

**math**

find the 4th term of an arithmetic sequence whose first term is -8 and whose 9th term is 32.
*Thursday, January 30, 2014 at 7:20pm*

**Maths **

if the 29th term of arithmetic series is double of 19th term then find the 9th term.
*Thursday, January 30, 2014 at 2:21am*

**Algebra 1**

Tell whether the sequence is arithmetic. If it is, what is the common difference? -12, -7, -2, 3,… (1 point)
*Monday, January 27, 2014 at 7:59pm*

**physics**

Now wait a minute, your questions are really all the same question. The only difference is arithmetic. F = k Q1Q2 /r^2
*Monday, January 27, 2014 at 1:37pm*

**Math**

PV = 1333.28(1 - 1.05375^-40)/.05375 = $21750.00 Balance after 8.5 year = 21750.00(1.05375)^17 - 1333.28(1.05375^17 - 1/.05375 = $17365.12 check my arithmetic
*Friday, January 24, 2014 at 4:04pm*

**Math**

a1 = 8 a2 = 4 a3 = 0 a4 = -4 a5 = -8 a6 = -12 etc so what ? arithmetic sequence
*Thursday, January 23, 2014 at 8:41pm*

**Accounting,business studies,economics and maths literacy**

Maths literacy suggest that you have basic arithmetic skills. They are needed in almost all careers.
*Wednesday, January 22, 2014 at 2:56pm*

**arithmetic**

T10 = 4 + 7x +(10-1)1+2x = 4 + 7x +9(1+2x) = 4 + 7x +9+18x = 13+25x T21 = 4+7x +(21-1)1+2x = 4+7x +20(1+2x) = 4+7x +20+40x = 24+47x
*Sunday, January 19, 2014 at 3:57pm*

**Math**

Two terms of an arithmetic sequence are t6=-3 and t11=-13. What is t20?
*Saturday, January 18, 2014 at 9:53pm*

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