Wednesday
July 23, 2014

Posts by Damon


Total # Posts: 17,498

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...

Physics
m g h + (1/2) m v^2

Pre-Calculus
Go back and check your volleyball question. I just saw it and you missed the angle of launch in your equations.

Pre-Calculus
Hey Alexis, between the two of us we have been doing an awful lot of problems for you. Many of them are the same old, same old. It is time for you to try and post what you did.

Pre-Calculus
I got ( +36 , 24 , 39 )

Science -Check Answers-
You are welcome :)

Science -Check Answers-
first is ok second no by conservation of momentum the velocity will remain the same until an outside force ACCELERATES it F = m A

math
4 y = -x + 5 y = (-1/4) x + 5/4 so m, slope = -1/4 y = -(1/4) x + b 9 = -(1/4)(6) + b 36 = - 6 + 4 b 4 b = 42 b = 10.5 so y = (-1/4)x + 10.5

math
12/8 = 3/2 = 1.5 9 = 1.5 w = 3 w/2 w = 18/3 = 6 feet 6 ft (12 in/ft) = 72 inches

Pre-Calculus
t = x - 6 y = 2 (x-6) - 4 y = 2 x -16

Pre-Calculus
Oh, I see from your other questions you are not using vector notation x = 0 + t = t y = 4 + 6 t

Pre-Calculus
y = 6 x + 4 through point (0,4) slope = 6 well (0,4) + (1,6) t should work

Pre-Calculus
That is the resultant, but you need the opposite to that so move it around 180 to cancel it

Math
y(t) = -16 t^2 + 32 sin 35 t + 4.5 x = 32 cos 35

Physics
three masses m .18 m and m - .18 m = .82 m ----------------------- momentum = m Va forever so m Va = .82 m (0) + .18 m (v) v is relative to ground or Va = .18 v throw speed relative to moving cart = v - Va = .82 v v = Va/.18 = 5.56 Va new speed of baggage relative to ground = ...

Math
what you have is .7 , .75 , .4 , .5 , .67 so 2/5 , 1/2 , 2/3 , 7/10 , 3/4

Alegbra
.05 x + .08(5000-x) = 331

math101
I will assume you mean (1/4) x - 18 = (1/2) x - 6 then -18 + 6 = (2/4) x - (1/4)x -12 = x/4 x = - 48 If I misinterpreted, please repeat using parentheses to show what is numerator and what is denominator.

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.

math
yes, 65 tan 50 is 77.5 so crash

Chemistry 2
20 at t = 0 5 at t = 40 A = C e^kt 5 = 20 e^40 k .25 = e^40 k ln .25 = 40 k -1.39 = 40 k k = - .03466 so A = 20 e^-.03466 t when A = 10, we have not only the blank filled but the half life .5 = e^-.03466 t ln .5 = -.6931 = -.03466t t = 20 I think you can do it now

Physics
If it is at rest plane angle T from horizontal force down plane = m g sin T force up plane = mu m g cos T no acceleration so mu m g cos T = m g sin T or mu = tan T

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