Friday

April 25, 2014

April 25, 2014

Total # Posts: 16,220

**mathematis**

I guess the first term is -4 and the difference is a = 3 Term n = term 1 + (n-1) a Term n = -4 + (n-1) 3 for example Term 3 = -4 + 2(3) = 2 , good, that works so Term n = -4 + (n-1)3 = 74 3(n-1) = 78 n-1 = 26 n = 27

**Algebra 1**

slope = 4 any other line with slope = 4 will do for the opposite side for example y = 4 x + 53178 then we need two lines perpendicular to those slope = -1/original slope = -1/4 so y = -.25 x + b again any two b values y = -.25 x + 3.14159 and y = -.25 x - 3.14159 or whatever

**algebra**

(-1 -(-1) ) /(-3-6) = 0/-9 = 0 so the slope is zero (of course) it is the line y = -1

**Science**

Look at the chart on the right of that link and the legend beneath it.

**Science**

Ever see a low frequency radio antenna :) ? there are radio waves kilometers long. see: http://en.wikipedia.org/wiki/Electromagnetic_spectrum

**finance**

I forgot to mention that the 30 year pays more per year than the 10 year because in the 30 years inflation may make the income worth much less.

**finance**

Of course as you can see, wealthy people often do not spell well.

**finance**

Well, one of the characteristics of the market is that some people will buy each of them depending on what their priorities are. A retiree with wishes for a very safe income stream might choose the 30 year treasury. A young person who is willing to take a risk for higher retur...

**finance**

yearly income versus safety versus inflation. Why do you think Greece is paying 5 times as much as France? Why do you think a 30 year bond pays more per year than a ten year bond from the same treasury ?(usually) Why do you think an inflation indexed bond might pay negative in...

**Science**

You can not copy and paste here. You could post it to a web hosting site like Scribd and then tell us how to find it (you can not post a link either) but that is a pain.

**Science**

We can not see your picture or diagram or whatever. low frequency is long wavelength is low energy. I have no idea which is brighter. Perhaps one is not in the visible spectrum?

**math**

huh? A /(1 + r/n) = P

**math**

10/20 = 1/2 = .5 meters = 500 cm in (ii) do you not want the WIDTH of the real house If so 80 cm = .8 m .8 m * 20 = 16 meters wide

**science(check answers)**

You have BOTH motion AND position

**science(check answers)**

NO!!!! total mechanical D

**science(check answers)**

I agree. in #7 motion is kinetic and position is potential (for example k x^2 or mgh) so together is total mechanical

**Physic assignment**

momentum before = 1.5*8 + 2*3 momentum after = 1.5*x + 2*7.29

**Cultural Diversity**

I am glad Ms Sue answered these. I looked at them and just shook my head.

**Trig**

tan 37 = h/x tan 58 = h/(5-x) x tan 37 = (5-x) tan 58 x (tan 37+tan 58) = 5 tan 58 x = 5 tan 58/ (tan 58 + tan 37) then h = x tan 37

**Math help**

4 x^2 - 8 = 0 x^2 - 2 = 0 (x-sqrt 2)(x+sqrt 2) = 0 x = sqrt 2 or x = - sqrt 2

**Geometry**

interesting two 5 , 12 , 13 right triangles in there 5 + 12 = 17

**math**

x</= 500 room rent = r = 400 + i x = 500 - (8/4)i cash = [ 500 - (8/4)i ] [400 +i] cash = c = (500-2i)(400+i) c = 20,000 - 300 i - 2i^2 dc/di = 0 for max or min = -300 - 4 i d^2c/di^2 = -4 so max i = -300/4 = -75 for max x = 500 -2(-75) = more rooms than we have so we can n...

**Math**

10 - 3 = 7 18 + 2 = 20 so 7 x + 20

**my mistake !**

then -12 + c = 3 c = -15 No, +15 !!!! put in y = 11 at x = 1 to get d 11 = -1 -6 -15 + d d = 33

**calculus**

I assume you mean y or f(x) = -x^3 +bx^2 +cx + d if so y' = -3 x^2 + 2 b x + c and y" = -6 x +2 b at x = -5 , y' = 0 -75 -10 b + c = 0 at x = 1 , y' = 0 -3 + 2 b + c = 0 so 2 b + c = 3 -10 b + c = 75 -----------------subtract 12 b = -72 b = -6 then -12 + c = 3...

**?**

Sorry, I do not know what that means.

**math**

(5282+4689+3029+6390) / 4 =4847.5 = 4848

**physics**

I assume that a Mg is a "megagram, a term I have never heard before. In that case we have 4*10^6 grams which is 4,000 Kilograms 4,000 * 30 = 120,000 kg m/s south

**physics**

F = G M m/R^2 = m v^2/R so v^2 = G M/R G = 6.67 * 110^-11 M = 6 * 10^24 Re = 6.38*10^6 meters Ra = 6.38*10^6 + .418*10^6 Rb = 6.38*10^6 + .731*10^6

**physics 1**

F = G Mm/R^2 = m v^2/R v^2 R = G M = 6.67*10^-11 * 5.98*10^24 v^2 R = 39.9 * 10^13 v T = circumference = 2 pi R so R = v T/(2 pi) R = v [1.77*10^4/(2 pi)] R = 2.82*10^3 v so v^3 (2.82*10^3) = 39.9 * 10^13 v^3 = 14.1 * 10^10 = 141 * 10^9 v = 5.2 * 10^3 v = 5,200 m/s

**log**

2 = e^.09 t ln 2 = .09 t = .6931 t = 7.7 years

**Trig**

2 sin 3x = 2[ 3 sin x-4 sin^3 x] = 6 sin x - 8 sin^3 x 4 sin 2x = 4[ 2 sin x cos x ] = 8 sin x cos x so 6 sin x - 8 sin^3 x + 8 sin x cos x 2 sin x [ 3 - 4 sin^2 x + 4 cos x ]

**Algebra**

for similar objects volume goes up proportional to cube of the length dimension. Of course people are not always mathematically similar in shape but never the less: ------ my answer is b

**Physics**

NONE !!!! work is force IN THE DIRECTION OF MOTION times distance

**Math help**

1. (Y+5)(Y-7)=0 if Y = -5 then you have (-5+5) (something) = 0 or 0 * something = 0 so 0 = 0 so Y = -5 IS A SOLUTION same deal for Y = 7 (something)( 7 - 7 ) = 0 sure enough y = 7 Is a solution so I claim in general if (something ) (a x + b) = 0 then x = -b/a IS a solution for...

**Chemistry**

Compare the physical and chemical properties of acids and bases.

**Algebra 2**

(5,10),(10,7)= y=(5/3)x-(17/3) m = (7-10)/(10-5) = -3/5 so your m = 5/3 y = (5/3) x + b x --> 15/2 y --> 17/2 so through (15/2 , 17/2) 17/2 = (5/3)(15/2) + b so 17/2 = 25/2 + b b = - 8/2 = -4 y = (5/3) x - 4 agree with your second answer this time

**Algebra 2**

(1,4),(6,-6)= y=(1/2)x-(3/4) m = (-6 -4)/(6-1) = -10/5 = -2 so your m = +1/2 check x ---> (1+6)/2 = 7/2 y ---> (4-6)/2 = -1 so (7/2 , 1) 1 = (1/2)(7/2) + b 4/4 = 7/4 + b b = -3/4 y = (1/2) x - 3/4 I like your first answer

**Algebra 2**

Perhaps I am not being clear. There is no reason the original pair of points would be on the perpendicular bisector of the line between them. In fact they better not be there.

**Algebra 2**

(-5,6),(1,8)= y=-3x+1 m = (8-6)/1+5) = 2/6 = 1/3 so yes, your slope is -3 y = -3 x + b now midpoint x --> (-5 + 1)/2 = -2 y --> (6+8)/2 = 7 so yes the middle is at (-2 , 7) 7 = -3(-2) + b 7 = 6 + b b = 1 so yes y = -3 x + 1 THe original points are NOT on the bisector.

**Math**

150 + 50 + 150 + 50 = 400 meters = 0.4 km .4 km/lap * n = 1 km n = 1/.4 = 2.5 laps

**algebra**

one gallon every 4/3 month so 3/4 mo/gal overcharge gallons = (3/4) gal/mo * t in months 5 = .75 t t = 6 2/3 months

**Pre-Calc Help please**

all logs base 5 64 is 4^3 log (4 x^2) = log 64 = log (4^3) so 4 x^2 = 4^3 x = 4

**health**

Now think about each of those. The only one that is hindered by exercise is the first, diabetes

**Math**

divide first row by 8 to get 1 in upper left 1 1/4 -17/2 add 7 times new first row to second to get 0 below the one 1 +1/4 -17/2 0 +3/4 -9/2 subtract 1/3 times row 2 from row 1 to get rid of that 1/4 in row 1 1 0 -7 0 3/4 -9/2 multiply second row by 4/3 to get 1 in 2,2 spot 1 ...

**Math**

-7 -6

**Math**

augmented matrix +8 +2 -68 -7 -1 +55 you have two rows, three columns now go to http://www.gregthatcher.com/Mathematics/GaussJordan.aspx

**Canals**

It makes New York bigger than Philadelphia :)

**Physics -- check answers please (new)**

Oh, and we disagree on 6

**Physics -- check answers please (new)**

1 c right 2 b right

**Physics -- check answers please**

you did not list them so I do not know what c and b are 6. If I add heat it will get hot I think, unless I subtract more heat :)

**Chemistry**

You are welcome :)

**Chemistry**

well, if I had one liter of the final stuff I would have 6 mols of H2SO4 in it so in 250 mL I need 6/4 or 1.5 mols H2SO4 so the real question is: What volume of 18M H2SO4 contains 1.5 mols of H2SO4 well there are 18 in a liter so I need 1.5/18 liter =.08333...... Liter which i...

**Typo**

3x=4y+5z=10 3x + 4y or 3x - 4y ???

**NEED HELP ASAP !!**

29,035 - (-1,349) = 29,035 + 1,349 =

**social studies**

New Orleans is a seaport and serves as the interface between shipping on the Mississippi River system(Including Missouri, Tennessee, Ohio rivers) and the rest of the world. When you cut a seaport off from the sea, it gets very poor as does the country behind it that depends on...

**social studies**

General Robert E. Lee.

**social studies**

It would be quite remarkable if they did.

**social studies**

Our own (Gloucester MA) General Butler mismanaged New Orleans :)

**4th grade math**

6/8 = 12/16 which is less than 15/16

**4th garde math**

3/5 = 36/60 4/12 = 20/50 so 3/5 is bigger

**Math typo**

.77 + .2 + .16 + .1 = more than 100% You have a typo I doubt if Europe has 77%

**math**

the corners

**Algebra**

B does 1/90 yards/min R does 1/75 yards/min B+R together do (1/90 + 1/75)yards per minute 1/90 + 1/75 = .0244 yards/min 1/.0244 = 40.9 minutes/yard

**basic algebra**

You are welcome :)

**basic algebra**

10 oz pot has 1 oz acid and 9 oz water x oz pot has .25 x oz acid and .75 x oz water so acid = 1 + .25 x water = 9 + .75 x total = 10 + x and (1 + .25 x) = .2 ( 10 + x) 1 + .25 x = 2 + .2 x .05 x = 1 x = 20 oz

**math**

use quadratic equation x = [ -4 +/- sqrt(16 - 24) ]/6 the solution is a complex number because b^2-4ac is negative. Given your last question, I do not think you have covered complex numbers. Perhaps you have a sign error.

**math**

(2x-1)(x+3)

**help**

Exactly how would we disallow workers from sending their money home? Like it or not, I think I might choose B.

**Algebra**

You are welcome :)

**Algebra**

v v+10 d = v*1 d = (v+10)*.5 so v = .5 v + 5 .5 v = 5 v = 10 d = v*1 = 10 miles

**Alegebra 2**

LOL - Yes, the reciprocals actually do add to 3

**Alegebra 2**

n and n+2 1/n + 1/(n+2) = 3 (n+2) + n = 3 n(n+2) = 3 n^2 + 6 n 2 n + 2 = 3 n^2 + 6 n 3 n^2 + 4 n - 2 = 0 n = [ -4 +/- sqrt (16 + 24) ]/6 n = [ -4 +/- 2 sqrt (10) ]/6 n = -2/3 +/- (1/3) sqrt 10 says positive so use + sign (sqrt 10 -2)/3 and (sqrt 10 -2)/3 + 6/3 = (4+sqrt 10)/3

**physics**

If the helicopter accelerates at 1 m/s^2 then the bananas accelerate at 1 m/s^2 unless the string breaks.

**Physics**

(1/2) m v^2 = 1.6*10^4 32 v^2 = 160 * 10^2 v^2 = 5 * 10^2 v = 10 sqrt 5 or about 22.4 m/s 22.4 m/s *3600 s/h * 1 km/1000 m = 80.5 km/h

**Math**

10 * 3 + 3 = 33

**math**

.8 * 360 = ?

**Physics**

average speed during stop = 15/2 = 7.5m/s time to stop = 7 m / 7.5 m/s = .933 s a = -15/.933 = -16.1 m/s^2 F = m a = 500(-16.1) = -8036 N a = same a = -16.1 v = Vi + a t 0 = 32 -16.1 t t = 32/16.1 = 1.99 s d = Vi t + (1/2)at^2 = 32(1.99) - 8(4) = 32 m d = Vi t - (16.1/2)t^2

**Algebra help PLEASE?**

(1/3)(pi*25)(20)

**Algebra help PLEASE?**

volume of cone = (1/3) area of base * height

**Math**

You are welcome :)

**Math**

http://www.jiskha.com/display.cgi?id=1393896576 that has the y axis intercept. for x axis what is x when y = 0? x = 2 so the two are (0, -2) (2, 0)

**stats**

binomial dist P(k wins in n trials) = C(n,k) p^k (1-p)^(n-k) C(10,1) = 10 because C(n,k) = n!/[k!(n-k)!] p = .1 1-p = .9 so P(10,1) = 10 *.1^1 *.9^9 = .387

**Math**

I just did that for you. http://www.jiskha.com/display.cgi?id=1393896576

**Science- Brady , Ms. Sue , Damon**

a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. Would any of those balls go anywhere on any predictable path? Would their motion be random? Could you guess where a...

**Science- Brady , Ms. Sue , Damon**

I did not answer before because those games would be meaningless without inertia.

**Physics**

1 - .92 = .08 left PE = m g h PE2/PE1 = 1.21/1.45 = .8345 .8345^n = .08 n log .8345 = log .08 n = 13.96 or about 14

**Math**

divide both sides by 1.9 x - y = 2 or y = x - 2 start at (0,-2) go up to right with slope of 1

**math**

8 x = 10 x = 1.25 so 10 = 8 + 25% of 8 is that true? 8 + 8/4 = 8 + 2 = 10 sure enough 25% x (45) = 18 x = 18/45 = .4 so it is only 40 % of original which is a decrease of 100 - 40 = 60% decrease is that true? 60% of 45 = 27 is decrease 45 - 27 = 18 sure enough

**science**

a = F / m

**science**

F = G M m / r^2 = m a = m v^2/r in other words gravitational force equals mass times centripetal acceleration.

**Intermediate Algebra**

b = 5 + h b (h/2) = 33 b h = 66 (5+h)h = 66 h^2 + 5 h - 66 = 0 (h - 6)(h+11) = 0 h = 6 b = 11

**Physic**

weight = 2 kg * g accelerating at a down T = string tension 2 g - T = 2 a or T = 2(g-a) block mass m slope = 20 deg I think (don't have your font) mus = .73 and muk = .53 Normal force = m g cos 20 friction force = mu m g cos 20 weight component down slope = m g sin 20 T -m...

**Math**

sin^2 + cos^2 = 1 so sin^2 = 1 - cos^2 so here 1 - cos^2 - cos^2 = .......

**math**

tan 65 = h/25 yes

**math**

24/10 - (1 3/10) 24/10 - 13/10 ???? = 11/10 = 1 1/10

**Physics**

F * 4 = 56 F = 56/4 = 14 N

**Physics -- check answers please**

I agree with all six

**Science**

grass for the horse that turns the treadmill. corn to make ethanol .... I will be at this all night, have to stop.

**Science**

windmill in the back yard for electricity and water well pump solar panels for hot water and electricity and heat stationary bikes hooked up to alternators to run battery chargers for your computers and some lights and maybe TV stream in back yard diverted to run over water mi...

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