Wednesday

September 17, 2014

September 17, 2014

Total # Posts: 27,117

**Math**

let the time taken since 10:00 am till they meet be t hrs at 10:00 am , train will have already gone 130 miles when they meet, they both will have traveled the same distance, so ... 90t = 130 + 65t 25t = 130 t = 5.2 hrs or 5 hrs and 12 minutes that would put the time at 10:00...
*July 29, 2014*

**Math**

1 ---> 4 = 2^2 2 ---> 8 = 2^3 3 ---> 16 = 2^4 4 ---> 32 = 2^5 mmmhhh, look at the exponent of 2 and compare it to your input value. isn't it always one greater ? so .....
*July 29, 2014*

**error - Algebra**

Whoahh there Sheenybeany if the inequality is y/6 > 10 then y > 60 Why did you reverse the inequality sign? It is reversed only if you multiply or divide by a negative. Since we simply multiplied by 6, it stays the same. Since y > 60 is not one of the choices, we ...
*July 29, 2014*

**geometry**

mmmh, I guess that explains why he is still a bachelor
*July 29, 2014*

**arggg! ... Geometry**

How did I possible see 4 of equal sides ? but... my algebra worked out sooo nice! Reminds me of the classic StarTrek episode where Cpt Picard is tortured by the Kardashians and sees 4 lights. https://www.youtube.com/watch?v=moX3z2RJAV8
*July 29, 2014*

**Geometry**

let the sides be a, b, and c We know: 4a +4b + 4c = 24 ----> a+b+c = 6 and 4ab + 4ac + 4bc = 22 2ab + 2ac + 2bc = 11 The length of the diagonal is √(a^2 + b^2 + c^2) by algebra, we know (a+b+c)^2 = a^2 + b^2 + c^2 + 2ab + 2ac + 2bc subbing in 6^2 = a^2 + b^2 + c^2 +11...
*July 29, 2014*

**math**

The way it is written, I must agree with Steve
*July 29, 2014*

**Math**

start at (-3,-4) and mark it since slope = rise/run = 2/3 the rise is 2 and the run is 3 so from the point (-3,-4) go to the right 3 (run of 3), then go up 2 (rise of 2) mark this new point, join with a line and you are done Easy, eh ??
*July 28, 2014*

**Math**

you replaced the y with -8 , but not the x with -3 Why not? -8 = -2(-3) + b -8 = 6 + b -14 = b so y = -2x - 14
*July 28, 2014*

**Math**

done below
*July 28, 2014*

**math**

1. can you think of two numbers which when multiplies yields -36 and when added is 16 how about 18 and -2 ???? (x+18)(x-2) 2. can you think of two numbers which when multiplies yields 9 and when added is -10 how about -1 and -9 (x^2 - 1)(x^2 - 9) now we have the difference of ...
*July 28, 2014*

**Math**

Natalie, use the method I showed you in your previous post slope of lines parallel to 8x + 4y = 7 = -8/7 slope of perpendicular lines = + 7/8
*July 28, 2014*

**math**

profit = 12.50 - 8.00 = 4.5 percentage profit = 4.5/8 = .5625 or 56.25%
*July 28, 2014*

**math**

I will assume from your poorly worded question that the sale price is $10.00 so if the original is $x .8x = 10 x = 10/8 = 12.50 Now, do you need the profit percentage before or after the sale? You decide
*July 28, 2014*

**Math**

use a two step process 1. take all terms except the y term to the right side 4x + 5y = 3 ----> 5y = -4x + 3 2. divide each term by the coefficient of the y term 5y = -4x + 3 y = (-4/5)x + 3/5 now you have it in the form y = mx + b, where m is the slope, so the slope is -4/5
*July 28, 2014*

**Calculus**

if F' (x) = -7x then F(x) = -(7/2)x^2 + c but F(0) = 1 1 = 0(-7/2) + c c = 1 F(x) = (-7/2)x^2 + 1
*July 28, 2014*

**math**

Johnny, looks like "homework dumping to me" How about showing us what steps you have taken in these problems or indicate where your difficulties lie.
*July 28, 2014*

**math**

I suppose we could do this .... 12V = 3W V = 3W/12 = W/4 then 2W - 8V = 2W - 8(W/4) = 2W - 2W = 0
*July 28, 2014*

**Geometry**

I agree with Bob My understanding of a trifoil has been this: http://www.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/9/9d/Trefoil-Architectural.png&imgrefurl=http://commons.wikimedia.org/wiki/File:Trefoil-Architectural.png&h=218&w=231&tbnid=...
*July 28, 2014*

**general math**

This is how I would have expected my students to write up the solution to this equation 5x − 2 = 2x + 7 5x - 2x = 7 + 2 3x = 9 x = 3
*July 28, 2014*

**Maths (differentiation)**

the way you typed it, Wolfram read it as http://www.wolframalpha.com/input/?i=+Y+%3D+1%2FSinX%5E2 and y = (sinx)^-2 dy/dx = -2(sinx)^-3 (cosx) = -2cotx /sin^2 x or = -2cotx csc^2 x if you meant: y = 1/ sin(x^2) then y = sin(x^2)^-1 dy/dx = -1sin(x^2)^-2 cos(x^2) (2x) = -2x cot...
*July 28, 2014*

**Math**

number of tests before the last one ---> x total marks at that point = 84x then (84x + 100)/(x+1) = 86 86x + 86 = 84x + 100 2x = 14 x = 7 So there were 8 tests, including his perfect test at the end.
*July 27, 2014*

**Maths**

Kelvin --- x Ken ----- x+6 average of Kelvin and Ken = (2x+6)/2 = x+3 David = (x+3) + 6 = x+9 (x + x+6 + x+9)/3 = 42 3x + 15 = 126 3x = 111 x = 111/3 = 37 David is 37+9 = =46 check: Kelvin --> 37 Ken----> 43 David ---> 46 average of Kelvin and Ken = (37+43)/2 = 40 Is ...
*July 27, 2014*

**math**

number of girls = 3x number of boys = 4x (check: total is 7x) total weight of all children = 7x(36) = 252x total weight of all the girls = 3x(32) = 96x so the weight of all the boys = 252x-96x = 156x average weight of boys = 156x/(4x) = 39 kg
*July 27, 2014*

**Maths**

Did you make a sketch? If so, you can see that cosØ = 2/6 = 1/3 Ø = cos^-1 (1/3) = appr 70.5°
*July 27, 2014*

**math**

Let the salaries of A, B, and C be 2x, 3x, and 5x respectively. then 3x + 5x = 8000 8x=8000 x = 1000 A's is 2000 C's is 5000 we don't really have to find their actual salaries amount that C has more than A is 5x-2x = 3x Percentage of that of A = 3x/2x = 3/2 = 1.5 ...
*July 27, 2014*

**math**

breadth --- x length ---- 1.2x 2(x+1.2x) = 88 x+1.2x = 44 2.2x = 44 x = 20 area = x(1.2)x = 1.2(20^2) = 480 m^2
*July 27, 2014*

**correction - calculus 2**

∆x = (6-1)/3 = 5/3 , so ∆x/3 = 5/9 should be ∆x = (6-1)/10 = 5/3 , so ∆x/3 = 5/30 = 1/6 and the 5/3 in front of the big brackets should be 5/30 or 1/6
*July 26, 2014*

**calculus 2**

I assume that you know the formula .... in case you don't, here is the method http://www.mathwords.com/s/simpsons_rule.htm ∆x = (6-1)/3 = 5/3 , so ∆x/3 = 5/9 interval = (6-1)/10 = 1/2 then we have (5/9)[ f(1) + 4f(1.5) + 2f(2) + 4f(2.5) + 2f(3) + 4f(3.5) + 2f(4...
*July 26, 2014*

**calculus 2**

fix your equation first
*July 26, 2014*

**math**

since the function is linear, the slope must be constant for any pair so (12-a)/(1-0) = (b-12)/(2-1) 12-a = b-12 24 = a+b
*July 26, 2014*

**Math**

number of increases of one unit of money (pesos ? or dollars ?) be n price = 10+n number sold = 200-10n revenue = R = (10+n)(200-10n) = 2000 + 100n - 10n^2 completing the square = -10(n^2 - 10n + 25 -25) + 2000 = -10(n-5)^2 + 2250 vertex is (5,2250) price should be 15 max ...
*July 26, 2014*

**math**

so -9x^2 + 9x + 5 = 0 9x^2 - 9x - 5 = 0 Don't see any obvious facors, so let's use the formula x (9 ± √261)/18 = appr 1.4 or -.4 looks like d)
*July 26, 2014*

**Calc**

let each of the 2 equal sides by x let yeach of the 3 equal sides by y xy = 1,500,000 y = 1500000/x let the length be L L = 2x + 3y = 2x + 4500000/x dL/dx = 2 - 4500000/x^2 = 0 for a min of L 2x^2 = 4500000 x^2 = 2250000 x = 1500 then y = 1500000/1500 =1000 so L = 2(1500) + 3(...
*July 25, 2014*

**math**

Since no choice of 3 points forms a straight line, you are simply finding the number of ways to choose 3 of the 5 points, which is C(5,3) or 5!/(3!2!) = 10
*July 25, 2014*

**good observation - Trigonometry**

Bosnian, thanks for catching that The question used feet as its units, and I just did the math without really thinking about that height. I think the linear units should have been metres and not feet. Both of our numerical values were correct, you also had 171.7 I recall ...
*July 25, 2014*

**Trigonometry**

I use a slightly different method. In my sketch , I labeled the top of the monument P and the bottom Q By properties of the sum of angles in a triangle, in triangle ABP , angle A = 32°, angle ABP = 142, and angle APB = 6° using the Sine Law: BP/sin32 = 55/sin6 BP = ...
*July 25, 2014*

**Math**

I made a sketch, letting the top of the building A I drew in the tower, called the top P and the bottom Q I drew a line from A to B, AB parallel to the ground thus QB = 16 , the same height as the building. We now have two right angled triangles, ABP and ABQ in triangle ABQ, ...
*July 25, 2014*

**maths**

I know math is heavenly, but triangles have angels ?? If the smallest angle is x, then the largest is 5x If they are in AP, then the middle angle must be 3x (note: 3x - x = 5x - 3x , using the common difference relationship) then x + 3x + 5x = 180 9x = 180 x = 20 the angles ...
*July 25, 2014*

**math**

pieces on disc = 3 + 4 + x = x+7 prob of picking one of the 4 ballads = 4/(x+7) but we are told 4/(x+7) = 1/4 x+7 = 16 x = 9
*July 24, 2014*

**Math 221*revised***

This is a poorly worded question. " y=x+4 and the parallel must past through this given point (-7, 1) " y = x+4 does not pass through (-7,1) and you cannot make it do it, unless you change its slope or y-intercept. If you merely want a new line which is parallel to y...
*July 24, 2014*

**MATH**

He can use the 2 pennies in 3 ways, take none, take 1 or take 2 He can use the 3 nickels in 4 ways, take none, take 1, etc the dime in 2 ways, and the quarters in 3 ways total number of ways = (3)(4)(2)(3) = 72 but that includes taking none of any coins, so number of ways to ...
*July 23, 2014*

**Math**

1. find what percentage of the trip Keith drove, then his wife must have driven the remaining percentage 2. 1.5J = (1/2)K 3J = K divide by K 3J/K = 1 divide by 3 J/K = 1/3 3. with radius r, area = πr^2 reduce radius by 10% ---> new radius = .9r new area = π(.9r)^2...
*July 23, 2014*

**MATH**

What choices did you pick? Where are your difficulties? I will do the first one, you try the others If A is 125% of B ----> A = 1.25B B = (1/1.25)A = .8A so B is 80% of A
*July 23, 2014*

**Algebra**

When it hits the ground , h(t) = 0 , so -16t^2 + 40t + 5 = 0 16t^2 - 50t - 5 = 0 Now solve this quadratic using the method that you learned. One of the answers will be negative, you would reject that one.
*July 23, 2014*

**math**

8 hrs, 15 minutes = 315 minutes total minutes available for the experiments = 8(315) = 2520 minutes 84 experiments take 2520 minutes 1 experiment takes 2520/84 or 30 minutes
*July 23, 2014*

**geometry**

areas of similar figures are proportional to the square of their sides area1 : area2 = 3^2 : 9^2 = 9 : 81 = 1 : 9
*July 23, 2014*

**math**

You must have meant: area is 2x^3+5x^2-x-6 if so, then it factors nicely into (x-1)(x+2)(2x+3) and the width of 2x^2 + x - 3 factors to (2x+3)(x-1) then (2x^3+5x^2-x-6) ÷ (2x^2+ x-3) = (x-1)(x+2)(2x+3)/( (2x+3)(x-1) ) = x+2 or you could do a long algebraic division as ...
*July 23, 2014*

**algebra 2**

Is this supposed to be the solution to finding the inverse of y = 1/3x - 5 ??? I suggest a 2-step process 1. interchange the x and y variables ----> x = 1/3y - 5 (you had that) 2. now solve this new equation for y x = 1/3y - 5 x+5 = 1/3y times 3 3x + 15 = y so f^-1 (x) = 3x...
*July 22, 2014*

**Algebra**

what do you think ? I just answered it for you in your previous post
*July 22, 2014*

**Algebra**

I would say it is A it simplifies to -x + 3 = 0 , which is linear and not quadratic. If you force the issue and make it look like a quadratic, it would be 0x^2 - x + 3 = 0 so a=0 , b=-1 and c = 0 BUT, in the formula we are dividing by 2a which in this case would be dividing by...
*July 22, 2014*

**math**

if AP , then d = 2k/3 - k = 2k/3 - 3k/3 = -k/3 term 6 = a+5d = k + 5(-k/3) = -2k/3
*July 22, 2014*

**Math**

2160 = 2*2*2*2*3*3*3*5 1344 = 2*2*2*2*2*2*3*7 1440 = 2*2*2*2*2*3*3*5 HCF = 2*2*2*2*3 = 24 2. let their income be x x/10 + x/3 + x/5 + 1320 = x times 150 , the LCM 15x + 50x + 30x + 198000 = 150x 198000 = 55x x = 3600
*July 22, 2014*

**algebra**

(3+2x)^5 = 3^5 + 5(3^4)(2x) + 10(3^3)(2x)^2 + 10(3^2)(2x)^3 + 5(3)(2x)^4 + (2x)^5 =243 + 810x + 1080x^2 + 720x^3 + 240x^4 + 32x^5 by simple observation that a negative base raised to an odd exponent is negative .... (3-2x)^5 = 243 - 810x + 1080x^2 - 720x^3 + 240x^4 - 32x^5 (3+...
*July 22, 2014*

**algebra 2**

use your formula for S(n) S(n) = a(r^n - 1)/(r-1) 405 = a(3^4 - 1)/(3-1) 405 = a(81 - 1)/2 405 = 40a a = 405/40 = 81/8
*July 22, 2014*

**math**

8+4+2+1+1/2+1/4+...+1/32 = 1/32 + 1/16 + ... + 4 + 8 sum = ∑ 2^(n - 6) for n= 1 to 9
*July 22, 2014*

**math**

sum(n) = (n/2)(first + last) sum(11) = (11/2)(1+6) = 77/2
*July 22, 2014*

**math**

volume = lwh = 18(3)(1/3) = 18 cubic feet
*July 22, 2014*

**coordinate algebra**

I don't see any choices, but it would have to be c = 4h
*July 22, 2014*

**trigonometry**

write it as y = -3sec 2(x-π/6) period = 2π/2 = π no vertical translation phase shift π/6 units to the right
*July 22, 2014*

**Maths**

a = b+2 c = b-11 )a+b+c)/3 = 70 a+b+c = 210 b+2 + b + b-11 = 210 3b = 219 b = 73 a = 75 c = 62 check: (73+75+62)/3 = 70 all looks good
*July 22, 2014*

**Math**

the wonders of Wolfram http://www.wolframalpha.com/input/?i=pattern+%2831%2C30%2C27%2C22%2C15%29 actual work did you notice that consecutive differences are -1, -3, -5, -7 ? this forms an arithmetic sequence, so a quadratic will act as the defining function. let the sequence ...
*July 22, 2014*

**Algebra**

e.g. x^2 - 6x = 0 add 9 to both sides x^2 - 6x + 9 = 9 (x-3)^2 = 9 x-3 = ±3 x = 3 ± 3 = 6 or 0 check: by factoring, x(x-6) = 0 x = 0 or x = 6 , as above
*July 21, 2014*

**Algebra**

I betcha I can solve any quadratic equation by completing the square.
*July 21, 2014*

**math**

#2 number of green = x number of marbles after 5 reds are added = x+5 prob of picking red = 1/7 5/(x+5) = 1/7 x+5 = 35 x = 30 there were 30 marbles
*July 21, 2014*

**math**

#1 g/(b+g) = 1/3 3g = b+g b = 2g (g+1)/(b+g+1) = 3/7 7g + 7 = 3b+3g+3 4g - 3b = -4 4g - 6g = -4 g = 2 then b = 4 , which is choice d. #3 1 million is an even number all prime numbers are odd, except the first one, which is 2, thus even so we have the sum of 999,999 odd numbers...
*July 21, 2014*

**math**

looks like a typo in both functions. is it f(x) = x+2 or f(x) = -x+2 ? same for the other one.
*July 21, 2014*

**Alegbra**

If the expression is as you typed it, then -9x - 13x+7 is indeed equal to -22x + 7 and it is your professor who is in error.
*July 21, 2014*

**Algebra**

I will assume you meant to type 9(/x-1)*7/(x-3) which is 63/( (x-1)(x-3) ) or 63/(x^2 - 4x + 3)
*July 21, 2014*

**math**

Make a sketch and set up your ratio. I get height/(30+25) = 20/30 height = 55(2/3) =110/3 ft or 36 ft, 8 inches
*July 21, 2014*

**math**

dimes in box A originally --- x dimes in box B originally --- y case 1: after 25 moved from A to B box A has x-25 box B has y+25 but x-25 = y+ 25 ----> x = y + 50 case 2: after 100 dimes moved from B to A box A has x+100 box B has y-100 but (x+100)/(y-100) = 7/2 7y - 700 = ...
*July 21, 2014*

**Trigonometry**

No need for trig, just use a simple ratio ... height/60 = 5/10 height = 60(1/2) = 30 ft (did you notice the height of the man is 1/2 of his shadow, then the height of the pole must be 1/2 its shadow, or 1/2 of 60, which is 30 )
*July 21, 2014*

**Trigonometry**

done, see your other post above
*July 21, 2014*

**statistics**

prob defective = .05 prob of good = .95 So we want the prob that all are good = .95^14 = .48776... prob of at least one is defective = 1 - .48776.. = appr. .512 The 8000 does not enter the picture, since we have the percentage if we used it then we could proceed as follow ...
*July 21, 2014*

**Algerbra 1**

again, you should type it as (y+5)/(x^2 + 4y - 32) , the way you have it, the only division is 5/y^2 = (y+5)/((y+8)(y-4)) so which values would make the denominator zero ?
*July 21, 2014*

**algerbra 1**

According to your given choices, I suspect you meant 2/( x(x-3) ) so the restrictions are, x = 0 x = 3 namely, those values which make the denominator zero, thus resulting in an undefined answer.
*July 21, 2014*

**math**

This is the best there is for these kind of questions Just fill in the data http://davidmlane.com/hyperstat/z_table.html
*July 20, 2014*

**Math 221**

2 < y and 7 ≥ y 2 < y and y ≤ 7 or 2 < y ≤ 7
*July 20, 2014*

**mat/117**

Use the formula like I showed you in your other post
*July 20, 2014*

**mat/117**

-3x^2+3x+9=0 x^2 - x - 3 = 0 x = (1 ±√13)/2
*July 20, 2014*

**Algebra**

The wording is poor. Did you mean: " The numerical value of the area of the rectangle is 25 more than the numerical value of 4 times the width" ? if so, then ... width --- x length -- x+4 x(x+4) = 4x + 25 x^2 + 4x = 4x + 25 x^2 = 25 x = 5 The width is 5 units (length...
*July 20, 2014*

**Algebra**

slope = (4 -(-9))/(-3 - (-2)) = 13/-1 = -1 Surely you must have the definition of slope in your notes or in your text.
*July 20, 2014*

**Algebra**

x - y ≥ 2 -y ≥ -x + 2 y ≤ x - 2 draw the line y = x-2 and shade in the region below the line. Since the line is included, make it solid (had it been y < x-2, you would have drawn a dotted line to show it is excluded.)
*July 20, 2014*

**Math**

double the first: 6x - 2y = -24 x + 2y = -18 add them: 7x = -42 x = -6 back into the second: -6 + 2y = -18 2y = -12 y = -6 x = -6 , y = -6
*July 20, 2014*

**Algebra**

I would use substitution, from the 1st: y = 5x-18 sub into the 2nd: -4x - 2(5x-18) = -6 -4x - 10x + 36 = -6 -14x = -42 x = 3 y = 5(3)-18 = -3 x=3 , y = -3
*July 20, 2014*

**College math**

let each of the two equal sides be x let the single side by y then y+2x = 5500 y = 5500 - 2x area = xy = x(5500-2x) = -2x^2 + 5500 Since you labeled it "college" math, I will assume you know Calculus d(area)/dx = -4x + 5500 = 0 for a max of area 4x = 5500 x = 1375 y...
*July 20, 2014*

**stats**

must be an old-type "crank on the wall" from The Waltons era .... anyway .... I will assume that none of your 6 digit numbers can start with a zero, and that numbers may be repeated, so we can't have a number with no 8 prob of no 8 = 8 x 9^5/(9x10^5) so prob that...
*July 19, 2014*

**math**

i = .105/12 = .00875 n = 12(30) = 360 payment ( 1 - 1.00875^-360)/.00875 = 130000 payment = $1189.16
*July 19, 2014*

**Math**

In 1959 the inch was internationally defined in terms of the centimetre 1 inch = 2.54 centimetres So if you want any precision you have to go back to that basic definition. c) 80 in = 80(2.54) cm = 203.2 cm = 2.032 metres once you have converted to any of the metric units, the...
*July 18, 2014*

**math**

cost of computer = .8(825) = 660 original amount of money --- x 12x/100 + .25(88/100)x +1320 + 660 = x 34x/100 - x = -1980 66x-100x = -198000 x = 3000 check: car repairs = .12(3000) = $360.00 leaves --- 2640.00 food = .25(2640) = 660 amount to parents = 1320.00 computer = 660 ...
*July 18, 2014*

**math**

Using proper algebra: number of lights --- x white = x/2 red = (1/3)(x/2) = x/6 blue = 4 yellow = 10 x/2 + x/6 + 4 + 10 = x times 6 3x + x + 6(14) = 6x 84 = 2x x = 42 42 lights in total check: whites = 21 leaves 21 red = (1/3)of 21 = 7 sum = 21 whites + 7 red + 4 blue + 10 ...
*July 18, 2014*

**typo - math**

just noticed a typo should have said: if 3 decimal places divide by 1000 but you probably figured that out anyway.
*July 18, 2014*

**math**

1. count the number of decimal places, in this case there are 2 divide by 100 -----> 12/100 2. reduce the fraction to lowest terms 12/100 = 3/25 (if 1 decimal place, divide by 10 if 2 decimal places, divide by 100 if 3 decimal places divide by 100 etc e.g. .2568 = 2568/...
*July 18, 2014*

**Math 221**

Third time for this question. Surely your text or notes must have your "Cowling's Rule" state and explained. Since I have no idea what it is, .......
*July 17, 2014*

**math**

288π , not 268 TT = appr 904.78 cm^3
*July 17, 2014*

**math**

volume of a cylinder is π r^2 h you are given r and h, take it from here.
*July 17, 2014*

**math**

volume of given tank = (45)(70)(10) cm^3 = 31500 cm^3 number of packages = 31500/3000 =10.5 but since we probably can't buy half a package, there will be 11 packages needed
*July 17, 2014*

**math**

according to your wording of the problem, term(n) = √term(n-1) - 2 or √term(n-1) = term(n) + 2 square both sides term(n-1) = term(n) ^2 + 4term(n) + 4 for n = 3, term(3) = 1 term(2) = 1^2 + 4(1) + 4 = 9 term(4) = √term(3) - 2 = -1 so we can't go any ...
*July 17, 2014*

**math (xi)**

looks like the definition of dy/dx for y = secx we know dy/dx = (sec x)(tan x) so lim [sec(x+h)-sec x]/h h>0 = (secx)(tanx)
*July 17, 2014*

**math**

sum of 20 = 10(2a + 19d) = 10(2a - 38) = 20a - 380 sum of 22 = 11(2a + 21d) = 11(2a - 42) 22a - 462 22a - 462 = 20a - 380 2a = 82 a = 41 first term is 41
*July 17, 2014*

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