Friday
December 9, 2016

Posts by Damon

Total # Posts: 28,449

Calculus
x = 2+ln(y-5) x-2 = ln(y-5) e^(x-2) = y-5 y = e^(x-2) + 5
September 3, 2016

Calculus
e^0 = 1 2x = 7 x = 3.5
September 3, 2016

math/Calculus
x = csc y = 1/sin y sin y = 1/x y = sin^-1(1/x)
September 3, 2016

Calculus
if g' is-1 which is as negative as it could be then g will be +1 at x=1 which is as low as it could be anywhere in the interval. Meanwhile f' could be+1 which would also make f = +1 at x = 1 which is a big as it could be. therefore f is always less than 1 and g always ...
September 3, 2016

algebra
after a year x = x + .03x = 1.03 x every year multiply by 1.03 2000 (1.03)^6
September 3, 2016

Algebra
You are welcome and I am from a fishing town north of Boston where we rise early.
September 3, 2016

Algebra
and in the second one a sign error (x-4y+5)(x-4y-5)
September 3, 2016

Algebra
Yes, you are right
September 3, 2016

Algebra
maybe complete the square? (x^2-8xy+16y^2) -16y^2 +16y^2-25 (x-4y)^2 - 5^2 (a-b)^2 = (a+b)(a-b) (x-4y+5)(x-4y+5)
September 3, 2016

Algebra
I am not sure what you want but 8 = 2^3 125 = 5^3 64 = 2^6 = 4^3 (2x/5)^3 + (4/y)^3 but a^3 + b^3 = (a+b)(a^2-ab+b^2) (2x/5+4/y)(4x^2/25-8x/y+16/y^2)
September 3, 2016

Algrebra
first line 5 y = 3 x - 9 slope = -3/5 second line assume you mean 2x+ky=11 k y = -2 x + 11 slope = -2/k now for parallel, same slope -3/5 = -2/k k = 10/3 for perpendicular new slope = -1/oldslope 5/3 = -2/k k = -6/5
September 3, 2016

Math
S + (70+S) + (70 + S + 50) = 730 3 S + 190 = 730 3 S = 540 S = 180 (70 + S + 50) = 120+180 = 300
September 2, 2016

math typo
1st case (x+1)/(y+1)= 3/4 2nd case. (x-3)/(y-3)= 1/2 not y-4
September 2, 2016

Physics
755/18 I have a sneaking suspicion that there is more to this question. Surely they then ask for the average velocity for the entire round trip which is zero because you return to the same spot and the total displacement is zero.
September 2, 2016

Physics
v = g t = 9.8 * 3.5 = 34.3 m/s I agree with you.
September 2, 2016

Physics
Vi = 3 0 = 9.5 + 3 t - 4.9 t^2 solve for t
September 2, 2016

Algebra 1
33 - g = 2 g - 9 42 = 3 g g = 14 m = 33-g = 19
September 2, 2016

MISSION
(pi d^2/4)h = V h = 4 V/(pi d^2)
September 2, 2016

Math concepts
in the ones place two. 3, 5 note: --- in higher places can be zero, like 010 = 10 so 10 of them in the tens place ten so 20 to date in the hundreds place ten so 200 in the thousands place ten so 2000 10003 is too big so none allowed in ten thousands place so I get 2000
September 2, 2016

Algebra
maybe you mean h(n) = -3 • 4^(2n+1) ????? h(2n) = -3 * 4 ^(2{2n] +1) = -3 * 4^(4n+1)
September 2, 2016

geometry
SR = TQ midpoints of equal lengths < SRQ = < TQR base angles of isoceles triangle RQ = QR same line segment so side, angle, side
September 2, 2016

geometry
ADB is congruent to ADC --- side, side, side the end really
September 2, 2016

Math
yes
September 2, 2016

S.S
I guess so, but living in a fishing town I do not call salt marshes an "obstacle".
September 2, 2016

Science
initial x momentum = .3*5 initial y momentum = 0 final x momentum = .3 Ux + .4(2)cosA final y momentum = .3 Vx + .4(2)sinA tanA = Vx/Ux = sin A / cos A
September 2, 2016

Math
I do not see your geometry arrangement. However in general change in volume = surface area of liquid * change in surface height dV = Area * dh dV = pi r^2 dh so dV/dt = pi r^2 dh/dt (1/4) = pi r^2 dh/dt so dh/dt= 1/( 4 pi r^2) You will have to find r from your geometry at ...
September 2, 2016

physics
I guess it goes (you do not tell me) spring x = 0, S down Pivot at x = 0.30, P up Board wt of 30*10 = 300 N at x = 1 down Diver wt of 60*10 = 600 N at x = 2 down P = S + 900 moments about x = 0 .3 P = 300*1 + 600*2 .3 P = 1500 P = 15000/3 = 5,000 N S = P - 900 = 600 N
September 2, 2016

someone please help!! i need to finish this!!
Too many, ask specific question if stuck. eg cross out first row and column | -2 +6 | | +3 -6 | = 12 - 18 = -6
September 2, 2016

Science help immediately
Yes, feedback
September 2, 2016

College Physics
so how many Joules do you need? potential energy = m g h = 3 *10^-3 *9.81* 10^-2 = .5*9*10^-6 V^2 30*9.81 = .5*9 V^2
September 1, 2016

Physics
the acceleration is about 9.81 m/s^2 down the entire trip velocity is zero at the top. It stops then falls. it went up for 1.9/2 = 0.45 s v = Vi - g t at top v = 0 0 = Vi - 9.81 (.45) so Vi = 9.81*.45 h = Vi (.45) - 4.9 (.45)^2 h is height above your hand
September 1, 2016

Singapore way ? someone expert?
I suspected from the phrasing of the question that the student is taking a subject based on the Singapore approach. My underlines (like _ ) are intended to be boxes. Did I do this right? I know 18 is right, but the explanation is new for me.
September 1, 2016

Math
lion _ monkeys _ _ _ total _ _ _ _ what times 4 = 24 6 so Lion 6 monkeys 6 6 6 or 6*3 = 18 (I am trying to learn Singapore math :)
September 1, 2016

Math
18 4/6 - 17 5/6 17 10/6 - 17 5/6 5/6
September 1, 2016

History! Help!
When that wild Mongol Tamerlane destroyed the irrigation systems in Mesopotamia (Iraq now) in around 1400 AD it was several thousand years old so surely a few thousand BC
September 1, 2016

math
By the way there are multiple answers to these for example sin 50 = sin 130 = cos 40 = -cos130
September 1, 2016

math
Hint: Draw the four Quadrants on a graph Draw line length 1 at 50 degrees up from the x axis Draw line length 1 at 50 degrees up from the -x axis sadme sine for 50 degrees and 180 - 50 degrees so sin 50 = sin 130
September 1, 2016

Social Studies
I wonder which side of the Interexcolony War Ethan Allen and the Green Mountain Boys took.
September 1, 2016

You decide
I am simply not going to just give you the answer. What do you think? Meanwhile I will contemplate the state militias at war.
September 1, 2016

English Check
Whew, that is settled.
September 1, 2016

English Check
The advice was meant for YOU. ok The advice was meant for ME. ok so which do you think ? Would you really say: "The advice was meant for I" ? They are objects
September 1, 2016

Social studies
I think the last one, religion.
September 1, 2016

Social studies
Protestants versus Catholics
September 1, 2016

Social studies
yes no - property owners. Originally you had to be a Puritan.
September 1, 2016

english
yes
September 1, 2016

Social studies
In North America it was the imported diseases from Europe that wiped out the natives. I suspect the same happened to the south.
September 1, 2016

Social studies
We are pretty proud of our public school history around here.
September 1, 2016

History
By the way, during most of WW2, I never really understood that the Japanese were enemy. I thought it was just Germans because I did not know any Germans. Japanese people were friends and neighbors in my life. It was impossible that they were bad guys.
September 1, 2016

History
They assumed that since they were Japanese in ancestry they might help the enemy Japan. It turned out to be nonsense. { My story: I was in Kindergarten in Honolulu when the Japanese bombed us. Many of my school mates and friends were Japanese Americans. In fact I think the ...
September 1, 2016

History
I bet you mean "code talkers". That usually refers to Navajo Indians who served the US Army in WW2 as communicators. Foreigners might be able to break most codes but had trouble with Navajo. See for example: http://en.wikipedia.org/wiki/Code_talker
September 1, 2016

Statistics
http://davidmlane.com/hyperstat/z_table.html
September 1, 2016

chemistry
Well, I suppose mass was conserved 10.2 + 66.9 = 77.1 ------------------------ You can stop there. ------------------------ Now let's check if they are in the right ratio 2 H2O ---> 2 H2 + O2 2 mols of H2 for every mol of O2 mol of H2 has mass 2 g mol O2 has mass 32 g ...
September 1, 2016

science
always multiply b something that is the same top and bottom except for the name of the unit for example 100 cm / 1 m is the same top and bottom so is 1 m/ 100 cm so if I have 105 m and I want cm I do 105 m (100 cm/m) = 10500 cm or 2000 mL (1 L / 1000 mL) = 2 L or 3400 g (1 kg/...
September 1, 2016

Math
slope = m = 4 y = 4 x + b -1 = 4(-5) + b b = 19 y = 4 x + 19
September 1, 2016

Mathematics
60 * 1/4 = 60/4 = 15 km 36 t = 15 t = 15/36 hour 15/36 * 60 = 25 minutes
September 1, 2016

math
boy does x jobs/day girl does y jobs/day (2 x + 5 y)4 = 1 job (4 x + 4 y)3 = 1 job 8 x + 20 y = 1 12 x + 12y = 1 2 x + 5 y = 1/4 2 x + 2 y = 1/6 ===============subtract 3 y = 3/12-2/12 = 1/12 y = 1/36 so a girl does (1/36) jobs /day find x and you know jobs/day a boy does If ...
September 1, 2016

nor do I
how much is a boy paid? boy does x jobs/day
September 1, 2016

american history
and was Maryland not a Roman Catholic colony at first?
September 1, 2016

american history
Oh , I missed no answer to 8 Most white colonists were farmers who prospered due to affordable land.
September 1, 2016

american history
1. I assume that you are talking about migrants from Asia across the North Pacific/ Bering Sea. These were nomadic tribes in general. 2 and 3 agree 4. I was not aware the the Dutch and French were fierce enemies particularly in North America. However they certainly did have ...
September 1, 2016

Math
(6/10 - 3/10)F = 60 3 F = 600 F = 200
September 1, 2016

isoceles triangle?
maybe? b + 2(b+7) = 95 3 b + 14 = 95 3 b = 81 b = 27
September 1, 2016

physics
mass of water = 44-18 mass of stuff = 39-18 density of stuff = 1 gram/cc * mass of stuff/mass ofwater
September 1, 2016

Math
24/10 - 13/10 = 11/10 = 1 1/10
September 1, 2016

American government
http://www.archives.gov/federal-register/constitution/
September 1, 2016

math
.31 + .20 = .51
September 1, 2016

AP Biology
http://www.chemspider.com/Chemical-Structure.84989.html 324.4 grams/mol so 100.7/275 = x/1000 x is grams in a liter divide x by 324.4 to get mols in a liter
September 1, 2016

AP Biology
22.4 liters/mol at stp so how many mols? 150/22.4 approximately (it does not say if we are at stp) grams of O2 = mols * 32
August 31, 2016

Algebra 2
L w = 51 2L + 2 w = 40 so L+w=20 51/w + w = 20 w^2 - 20 w + 51 = 0 w = [ 20 +/- sqrt (400 - 204)]/2 = [ 20 +/- 14]/2 so 3 by 17
August 31, 2016

Forensics
(1/2)^n = 1/16 n = 4 half lives 4 * 29 = 116 years if you did not see that 2^4 = 16 then you could do .5^n = .0625 n log .5 = log .0625 n = log .0625 / log .5
August 31, 2016

Math
50 + 100 = 150 m/h combined speed 150 t = 400 t = 40/15 = 8/3 = 2 2/3 hr = 2 hours and 40 minutes
August 31, 2016

Technology
Perhaps Livy is not using a keyboard and so can not look at those two keys closely.
August 31, 2016

Technology
I am puzzled. They are the keys your index fingers (not middle fingers) should rest on.
August 31, 2016

Physics
2.38*10^6 2.38 million = 2,380,000
August 31, 2016

whoops sorry
yes r = 0.05/52 weekly not daily !
August 31, 2016

math
.05 / 365 = r 4*52 = 208 = n x (1+r)^n = 3000 x = 3,000/(1+r)^n
August 31, 2016

Algebra
sqrt (17) real not natural not whole not rational not integer irrational
August 31, 2016

math
look up sinking fund formula r = .04/12 rate per month n = 10*12 = 120 months 250 = P /[ (1+r)n -1]/r so P = 250 [ (1+r)n -1]/r
August 31, 2016

Math
50(t-1) + 45 t = 330 95 t - 50 = 330 95 t = 380 t = 380/95 about 3 hours
August 31, 2016

math work
Maybe a vector 94 i + 93 j for example | 2 3 | |94| | 1 2 | |93| would be matrix times vector V = 94 i + 93 j
August 31, 2016

watch parentheses!
(2-x)/(2+x) maybe? if x = 2, numerator is zero, expression is zero if x = -2 Explodes, undefined
August 31, 2016

math work
do you mean u dot (v X w) ???? if so vXw = +i +j +k -6 +1 -5 +2 +8 -9 = (-9 +40)i + (-10-54)j +(-48-2)k -49i -64j -50 k now dot with + 9i - 7j - 3 k ---> -441 + 448 + 150 157 CHECK MY ARITHMETIC
August 31, 2016

math work
I think you mean orthogonal not octagonal a. vector normal (perpendicular to) first plane 4 i + 5 j +1 k second plane 3 i + 5 j -37 z find the dot or cross product dot is easier A dot B = |A||B| cos angle between if cos is 0, they are othogonal because cos 90 degrees is 0 if ...
August 31, 2016

math
You are welcome.
August 31, 2016

math
x = -2 + steps right y = -5 + steps up so x = -2 + 1 = -1 y = -5 + 3 = -2 (-1 , -2)
August 31, 2016

Math
65 + x = -12 x = -65 - 12 = -77 so 4
August 31, 2016

?
dilated how much?
August 31, 2016

Math
n and n+1 1/n + 1/(n+1) = 17/12 12(n+1) + 12 n = 17 n(n+1) 12 n + 12 + 12 n = 17 n^2 + 17 n 17 n^2 - 7 n - 12 = 0 hummm, suspect typo
August 31, 2016

Science
Yes
August 31, 2016

ah, magic ?
I do not see the figure.
August 31, 2016

Algera check answers
Which of the following is the most appropriate unit to describe the rate at which data is transferred using the internet? =========================== Time needed is a function of megabits of data. D yes ========================== 2 + (x + y) = (2 + x) + y is an example of ...
August 31, 2016

math
4 10/15 - 3 6/15 = 1 4/15
August 31, 2016

Physics
50 * 9.81 * 2.4 = about 1200 J If you say g = 10m/s^2 you get exactly 1200 J
August 31, 2016

Physics
a = change in velocity/change in time = -20/4 = -5 m/s^2 F = m a = -300*5 = -1,500 Newtons
August 31, 2016

math
x^-n = 1/x^n 5 * 10^-2 = 5/10^2 = 5/100 = 0.05
August 30, 2016

math
( distributive property :)
August 30, 2016

math
if I have 100 dollars and increase that by 5% I then have 100*1 + 100*0.05 which is 100 (1.05)
August 30, 2016

Physics
s is initial speed Vi = s sin 6 v = Vi - g t at top v = 0 t = s sin 6 / 9.81 u = s cos 6 11 = u t t = 11/(s cos 6) so 11/(s cos 6) = s sin 6/9.81 solve for s, the initial speed get t then h = .39 + Vi t - 4.9 t^2 for part b u = s cos 6 new u = .25 s cos 6 then t to fall from h...
August 30, 2016

Physics
Now I did the squash one. Based on that you should be able to do this one.
August 30, 2016

Pre-Calculus
sec = 1/cos note cos is 0 at pi/2 so sec is undefined there (infinite + or -) in quadrant I cos is + so sec is + but in quadrant II cos is - so sec is - note cos always </= |1| so |sec| always >/= |1| that should help with your graph
August 30, 2016

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