Friday
September 30, 2016

Posts by Damon

Total # Posts: 27,213

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

math
It is divisible by 2
August 30, 2016

Pre-Calculus
y = sin x what values can x have? any real number right? y = sin^-1 x what values can x have? Only between -1 and + 1 right?
August 30, 2016

physics
you drove how long at 95? 180 km / 95 km/hour = 36/19 hour (45/10 - 36/19)hours at 65 about (90/20 - 36/20)65 = 54*65/20 = 175.5 km approximately 175 + 180 = 355 km approximately I do not feel like turning my calculator on. You can do it accurately.
August 30, 2016

Math
1 gallon (12 miles/0.3 gal) = 120/3 = 40 miles
August 30, 2016

Math
You are welcome.
August 30, 2016

Math
k^10 v^13
August 30, 2016

History
yes
August 30, 2016

Math
4,020,561,340 add 0*10^0 4*10^1 3*10^2 1*10^3 6*10^4 5*10^5 0*10^6 2*10^7 0*10^8 4*10^9 :)
August 30, 2016

History
I would vote for the riches :) He was quite sure the world was round as were most navigators but he far underestimated the diameter and therefore thought he was in the East Indies when in fact he was in the West Indies :)
August 30, 2016

Science
All correct.
August 30, 2016

Math
60 person days/job (1/60) job/person day (1/60)job/person day *(4) persons = 4/60 job/day = 1/15 job/day so 15 days
August 30, 2016

math homework
5^2 + 12^2 + 9^2 = 250 length = sqrt 250 = 5 sqrt 10 so (1 / 5sqrt10) (-5,-12,9)
August 30, 2016

typo, please check what youi posted
-9, 12, 21 You have a typo Please proofread before you post http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
August 30, 2016

Physics
time outbound = d/48 time back = d/340 so d/48 + d/340 = 1.2 (.0208333 + .00294)d = 1.2 d = 50.5 meters
August 30, 2016

Math
q q * - n * - d * n q * - n :( - d :( d q * - n :( - d :( so 5/9
August 29, 2016

Math - Check please!
I agree you.
August 29, 2016

ALGEBRA
put these two points on a number line one is four to the left of zero and the other is 21 to the right of zero so the total distance between them is 21 + 4 = 25 or write 21 - (-4) = 21 + 4 = 25
August 29, 2016

physics
Xa = -5.3 + 8.1 t Xb = 4.7 - 7.8 t so when they meet Xa=Xb -5.3 + 8.1 t = 4.7 - 7.8 t 15.9 t = 10 so t = 10/15.9 then Xa = x for example = -5.3 + 8.1(10/15.9)
August 29, 2016

Math
6*9 = 54 so -54 beads
August 29, 2016

Math
done that above, -54
August 29, 2016

Chemistry
Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
August 28, 2016

physics
What if the highway runs north-south?
August 28, 2016

typo
They have to tell you the mass.
August 28, 2016

PHYSICS
He ends up going 200 meters west in 252 seconds. Therefore we an figure out his west velocity component: Vw = 200/252 m/s Meanwhile he is carried south at .5 m/s so he will have to have a north component of Vn = .5 m/s So we can figure the angle north of west he has to head. ...
August 28, 2016

physics
weight down = 8 * 9.81 T up so m = hanging mass m a = F 8 a = 8*9.81 - T and top mass T = 5 a so 8 a = 8*9.81 - 5 a 3a = 8*9.81 a = 8 * 9.81/3 T = 5 * 8 * 9.81
August 28, 2016

physics
a = -3 m/s^2 v = Vi + a t at stop 0 = 20 - 3 t t = 20/3 (they should have started at 21 m/s) d = Vi t + (1/2) a t^2 d = 20 (20/3) - 3/2 (20^2/3^2) = 20^2/3 - 20^2/6 = 20^2/6 = 400/6 = 200/3 or easy way for second half is average speed during stop = 10 10 (20/3) = 200/3
August 28, 2016

Maths
y = 2x+8 y = 50 - x so 2x+8 = 50-x 3x=42 x = 14 y=36
August 27, 2016

Math
huh? (y2-y1) = -5-3 = -8 (x2-x1) = -2 +10 = 8 so slope = -8/8 = -1 so y = -1 x + b use either point now 3 = -1(-10) + b b = -7 so I get y = -x -7 ================ check that with the other point -5 = 2 -7 sure enough
August 27, 2016

physics
a = change in velocity/change in time = 495/1.78 m/s^2 braking is opposite velocity a = -495/2.16 m/s^2 note the acceleration of gravity is about 10 m/s^2 so this is more than 25 g,scary.
August 27, 2016

Chemistry
Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
August 27, 2016

physics
weight = normal force = m g = 50 * 9.81 Newtons static force = .4 * 50 * 9.81 moving force = .3 * 50 * 9.81 assume use entire static force or it will not accelerate .1*50*9.81 = m a = 50 a so a = .981 m/s^2 v = a t = .981 * 5
August 27, 2016

physics
g = 9.81 m/s^2 v = Vi - g t at top v = 0 t = 25/9.81 seconds to top double that for time in air m g h = (1/2) m Vi^2 h = 625/(2*9.81) v is 0 at top of course a is -9.81 m/s^2 forever until it hits the mud.
August 27, 2016

Computer Applications
maybe something like this: n = 101 sum = 101 1 if n = 199 quit n = n+2 sum = sum + n go back to 1 quit ---> print the sum and end
August 27, 2016

physics
In the Google search engine input: 40 mph = km/h You will find 64.3738 km/h which is 62373.8 meters/h which is 62373.8 meters/h (1 h/60 min) in meters/min times 3 for 3 minutes 64.3738 km/h * 1 h/3600 s) * t = 1 km so t = 3600/64.3738 seconds
August 27, 2016

Physics. Pleaseee helpppp
calculate the potential energy in the center 4 k 2 Qe^2/half diagonal^2 then calculate it at the center of a side 2 k 2 Qe^2/ half side^2 + 2 k 2 Qe^2/diagonal^2 the difference in potential energy is the work done
August 27, 2016

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