Monday
October 20, 2014

Posts by Damon


Total # Posts: 18,972

Science
You mean 10 m/s^2 I assume wow, 1 g for five minutes ? to the moon ? anyway 5 min = 300 s v = Vi + a t v = 0 + 10 (300) = 3000 meters/second
September 20, 2014

Science
yes, yes
September 20, 2014

Pre-Cal
y = +/- sqrt(1-x^2) if y is to be real, x must be x^2 </= 1 -1 < x < +1 similarly y ranges from -1 to + 1 so our function 2 x - 5y is maximum when x is 1 and y is -1 2 + 5 = 7
September 20, 2014

math
G = 1000 + 325 m E = 2500 + 325 m E always pays more than George by 1500
September 20, 2014

Algebra 2
1 and 2 fine 3. Evaluate (2.0 x 10^-7)/(8.0 x 10^-9). Write the answer in scientific notation. A: 0.25 x 10^2 but usually written 2.5 * 10^1 age is not a function of last name R = 75 - 3.5 d if d = 5 R = 75 - 17.5 = 57.5 dollars left in pocket
September 20, 2014

Physics
p Newton = m v p relativistic = m v /sqrt(1 = .75^2) so 100(p relativistic - p newton)/p rel here 1/sqrt(1-.75^2) = 1.512 so 100 ( 1.512 - 1)/1.512 = 33.9 %
September 20, 2014

Physics
E = m c^2 so m = E/c^2 E = 2*10^9 *21 * 7 *24 *3600 = 2.54*10^16 c = 3*10^8 m/s c^2 = 9 * 10^16 so m = 2.54 / 9 = .282 Kg = 282 grams
September 20, 2014

physics
You need to know two things: 1. how long does it take to fall 0.7 m 2. How fast is your horizontal velocity after falling 2.76 meters? Then distance = horizontal velocity * time to fall 0.7 meters = u t -------------------------- so, how long to fall 0.7 m? 0.7 = (1/2) g t^2 t...
September 20, 2014

History
French traders used the Red River to ship to New Orleans from the southern part of Oklahoma. I think they probably mean Red River although indeed the French fur traders also used the Arkansas.
September 19, 2014

History
None of the others happened in or around 1821 so I would say A
September 19, 2014

physics
original south = 9.75 cos 25 final south = 8.64 sin 35 original east = 9.75 sin 25 final east = -8.64 cos 35 south a component = (final south -original south)/ .179 east a component = (final east component - original east component) / .179 resultant mag of a = sqrt (south a^2...
September 19, 2014

Math
x axis intercepts at y = 0 (x-3)(x+1) = 0 x = 3 and x = -1 y axis intercepts where x = 0 y = -3
September 19, 2014

physics
Vi = 60.32 yes u = 85.3 cos 45 = 60.32 also but forever v = Vi + a t = 60.32 -9.81 t so at top when v = 0 t = 6.15 seconds coasting up h at top = Hi + Vi t -4.9 t^2 = 587 + 60.32 (6.15) - 4.9(6.15^2) = 773 meters high at 6.15 seconds when fall starts now it falls 773 = 4.9 t^2...
September 19, 2014

algebra - check my answer?
yes
September 19, 2014

Math
4(x-1)^2 + 3 (x-1) - 3 4(x^2-2x+1) + 3 x - 3 - 3 etc
September 19, 2014

Math
Yes, what Mia said :)
September 19, 2014

Math
about x axis? for any x is are there equal in magnitude + and - values of y? y ^2 = x+1 y = +/- sqrt (x+1) so yes but x must be >-1 about y axis? Nah, this is a parabola opening to the right with as vertex at (-1 , 0)
September 19, 2014

Math
Everything on the number line left of x = -2 including x = -2 so Big black dot on -2 arrow pointing left from there. I do not know what the number six has to do with the problem. B is the only one with all the values in our domain.
September 19, 2014

Math
w +(w+6) = 34 2 w + 6 = 34 2 w = 28 w = 14 ================== 5 a - 20 - 8 a = 55 -3 a = 75 a = 25 ====================== 6 n - 7 = 45 6 n = 52 n = 26/3 as you wrote it If you mean instead (2n-7)/3 = 15 then 2 n - 7 = 45 2 n = 52 n = 26
September 19, 2014

english
Illustrator
September 19, 2014

Math
You are welcome.
September 19, 2014

Math
n - 6 >/= 2 n >/= 8 agree
September 19, 2014

French
Everyone always says they are fine even if on the verge of death.
September 19, 2014

History
agree B turned out to be major.
September 19, 2014

Math
Yes
September 19, 2014

Math
g / - 5 < -18 if you multiply both sides by -5 you must reverse the direction of the arrow. g > + 90 C.
September 19, 2014

History
Negotiated relatively safe traffic through Indian lands from Missouri west
September 19, 2014

whoops, -1 not + 1 use Steve's answerr
dumb error
September 19, 2014

Pre-Calculus Questions
slope = (-3 - 3)/ (1+5) = -6/6 = -1 y = -x + b 3 = -1(-5) + b b = -2 y = -x - 2 =============================== x axis(0, -3) y axis where y = 0 x^2 - 2 x - 3 = 0 (x-3)(x+1) = 0 x = 3 or x = 1 so axis of symmetry and vertex at x = (1+3)/2 = 2 then y vertex = 4-4 - 3 = -3 so ...
September 19, 2014

History
Spanish gave up claim to Oregon territory
September 19, 2014

physics
v = 20 - 9.8 t v = 0 at top 9.8 t = 20 h = 20 t - 4.9 t^2 or m g h = (1/2) m v^2 h = (1/2)v^2/g
September 19, 2014

Mathematics
(1/2) 116 = 58 (1/2) 8 = 4 tan 58 = 4/h
September 19, 2014

math algebra word problems
Their speed is 1.5 + 1.2 = 2.7 miles a day
September 19, 2014

physics
period = 1/ frequency wavelength = period * speed so wavelength = speed / frequency Your textbook must have that !!!
September 18, 2014

Algebra
2 m^2 + 3 = m 2 m^2 - m + 3 = 0 m = [ 1 +/- sqrt (1 - 24) ]/ 4 = [ 1 +/- sqrt(-23) ]/4 complex conjugate pair.
September 18, 2014

science
....and you answered the question about how many cars and trucks incorrectly thereby confusing some other poor student.
September 18, 2014

science
Moreover we do not have the slightest idea what microscopes you might have in your school.
September 18, 2014

physics
lambda = distance = speed * time Time = period = 1/ frequency
September 18, 2014

Physics
a = change in velocity/change in time = (14 -0) / 10 2.) zero 3.) (1/2) m v^2 = m g h so v = sqrt (2 g h)
September 18, 2014

Math
If there were 6 trucks there would be 30 cars and 36 total, no good t + 5 t = 30 6 t = 30 t = 5 not 6
September 18, 2014

math
no x^n = x * x * x * x .......... n times
September 18, 2014

Math
balance = 4000 (1.05)^n geometric sequence a = 4000, r = 1.05 4000 4200 4410 etc
September 18, 2014

MATH WORD PROBLEM
180 = (3/2)x x = 360/3 = 120
September 18, 2014

physics
a = change in velocity / change in time and F = change in momentum / change in time (Newton #2, F = d/dt (m v) = m a if m is constant)
September 18, 2014

physics
a = (0-12)/.1 F * t = change in m v F * 0.1 = 60 (0-12)
September 18, 2014

Urgent Spanish Check
Well, for a bunch of Norte Americanos we are not doing too badly.
September 17, 2014

Urgent Spanish Check
hmmm, una clase is feminine but lo is masculine. La is feminine.
September 17, 2014

social studies check
I do not think he accomplished what he was hoping to accomplish. What he did accomplish was not his original objectives.
September 17, 2014

social studies check
Well, he did not find China. He ended up dead someplace west of the Mississippi. He did get a lot done and was the first European explorer in those parts, however the goals of his sponsors to find vast riches of gold, jewels and silver and find a route to the Orient were not ...
September 17, 2014

social studies check
I agree with D. It is hard to sustain a culture when everyone is dead.
September 17, 2014

Urgent Spanish Check
You are welcome.
September 17, 2014

Urgent Spanish Check
EL examen VERDE miS hermanas LOs
September 17, 2014

social studies check
I think the key word is PERMANENT. The woodland people were still in place when the Europeans arrived.
September 17, 2014

social studies check
THey did NOT want to form large plantations as in South Carolina !!
September 17, 2014

physics
Give ALL the units of resistivity. Then the problem solves itself as long as you know Area of circle = pi d^2/4 Resistance = resistivity * length/area
September 17, 2014

English
The only problem I have with these sentences is that they are extremely awkward. I would have said: I think I will be a good bow rower because I can balance the boat accurately. I think I will be good rowing in the middle of the boat because I am strong and can make the boat ...
September 17, 2014

Physics please help
slope of displacement versus time or dx/dt at any point is velocity v = integral of a dt if you were given the ACCELERATION ,a, you would need to do area, but you were not.
September 16, 2014

math
x y z 4 y z y>z 4 + y + z = 6 y + z = 2 since y>z y = 2 and z = 0 4 2 0
September 16, 2014

Pre-Calculus
a) so use -3 for x (-3)^2 + 9 = 9+9 = 18 b) now use -2 for x (-2)^2 + 9 = 4 + 9 = 13
September 16, 2014

Calculus I
dL = a Lo dT L = a Lo T + constant when T = 0, L = Lo so L = (a Lo) T + Lo To is y (or in this case L)axis intercept (a Lo) is slope
September 16, 2014

Curriculum
The average dictator would name the gerbil :)
September 16, 2014

Math
A number and its absolute value are equal. SO IT IS POSITIVE OR ZERO if you subtract 2 from the number, the new number and its absolute value are not equal. IT GOT NEGATIVE WHEN WE TOOK 2 FROM IT, SO IT IS BETWEEN ZERO AND TWO 1.9999999999999999999999999999 :)
September 16, 2014

Curriculum
Way to go Daniela !!!! Much better answers today !
September 16, 2014

Geography
GDP is entirely financial and may say nothing about how well the residents live. For example a country with huge natural resources such as gold mines may have a high GDP but only a few rich people and the vast majority uneducated and underfed. HDI takes into account how well ...
September 16, 2014

Math
and for the third time 25 minutes
September 16, 2014

Math
still 25 minutes
September 16, 2014

Math
3/5 * 5/3 = 1 entire task :) 15 * 5/3 = 25 minutes
September 16, 2014

chemistry
Ice water remains at 0 deg C until all is melted. In other words , yes you are correct.
September 16, 2014

Urgent Spanish Check
gato ends with o
September 16, 2014

Physics
tourist runs d at 5.56 bear runs (d+26.6) at 7.69 same time for both time = (d+26.6)/7.69 = d/5.56 solve for d
September 16, 2014

maths
76-47 = 29 47-29 = 18 29-18 = 11 18-11 = 7 11-7 = 4 7 -4 = 3 <--------
September 16, 2014

Physics
pick some times that meet the criterion north for 30 seconds, south for 10 seconds , total time = 40 seconds distance north from start = 25*30 then back 32*10 total distance north (displacement vector, not distance traveled) = 25*30 - 32*10 so Vaverage = (25*30 - 32*10)/40 = (...
September 16, 2014

Physics
a) 515/229 b) average speed = (0 + final speed)/2 = answer to part (a) in other words answer to b = twice answer to a c) a = change in velocity/change in time = answer to part b /229 seconds
September 16, 2014

Physics
Vi = 2.53 Hi = 5.82 0 = Hi + Vi t - 4.9 t^2 4.9 t^2 - 2.53 t - 5.82 = 0 solve quadratic for t eg : http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
September 16, 2014

Coordinate Algebra
y = -3 x + b 4 = -3 (5) + b 4 = -15 + b b = 19 y = -3 x + 19
September 16, 2014

Algerbra
http://davidmlane.com/hyperstat/z_table.html
September 16, 2014

Social Studies
I agree with you.
September 16, 2014

Social Studies
These tricky double negative questions are exasperating.
September 16, 2014

Social Studies
So C is the answer. Farmers were NOT allowed to own slaves.
September 16, 2014

Social Studies
the trustees prohibited Negro slavery, for they believed that this ban would encourage the settlement of "English and Christian" people.
September 16, 2014

Social Studies
No, It was charitable, to help the poor !!!!! One of the reasons they prohibited slavery was to avoid large plantations as had infested South Carolina !!!
September 16, 2014

algebra
ok, sure, you paid 10 for the right to buy tickets (admission to the fair grounds?)
September 16, 2014

differential calculus
tan A = h/50 sec^2 A * dA/dt = (1/50) dh/dt dA/dt = (4/50)cos^2 A at h = 50, cos A = .707 and cos^2 A = 1/2 dA/dt = 4/100
September 16, 2014

differential calculus
p v^1.3 = k p d/dt (v^1.3) + v^1.3 dp/dt = 0 1.3 p v^.3 dv/dt + v^1.3 dp/dt = 0 1.3 p dv/dt = - v dp/dt 1.3 dv/dt /v = - dp/dt /p
September 16, 2014

Algebra
that last number = (d/2)^2 so 64 = d^2/4 d^2 = 4 * 64 d = 2*8 d = 16 like (x+8)(x+8) then the second one d^2/4 = 49/4 so d = 7 like (x+7/2)(x+7/2) = x^2 + 7 x + 49/4
September 15, 2014

geography
HUH? They are perpendicular to each other. Meridians run north South and equator runs East west. There is only one equator, around the middle between north and south poles. There are lots of meridians stretching from north pole to south pole and just one is selected (through ...
September 15, 2014

Physical Science
subtract
September 15, 2014

Chemistry
every .001 mol Ca(OH)2 needs .002 mol of HCl so we have .002 mol in 25*10^-3 liters .002/.025 = .08 mol/liter
September 15, 2014

Chemistry
N 14 g/mol H 1 g/mol NH3 is therefore 17 g/mol, 2NH3 is 34 N2 is 28 g/mol every 2 mol of NH3 requires 1 MOL OF N2 so every 34 g of NH3 requires 28 g of N2 so finally 325 g NH3 (28 N2/34 NH3) = 268 g N2
September 15, 2014

Chemisty
Mg --> 24.3 g/mol 2 O --> 32 2 H --> 2 sum = 58.3 g/mol 17.8 g * (1 mol/ 58.3 g) = .305 Mol ======================================== 123 + 273 = 396 deg K 468 + 273 = 741 deg K P1 V1/T1 = n R = P2 V2/T2 V2 = V1 (P1/P2) (T2/T1) V2 = 20.46 (1.35/1.35) (741/396)
September 15, 2014

Math
length of ramp is hypotenuse = c length along floor is adjacent = a cos (angle) = a/c
September 15, 2014

History
Whew :)
September 15, 2014

History
the mission included men with skills or training in ******geology******, botany, zoology, and ethnology as well as a naturalist, an artist, and a topographer.
September 15, 2014

Can't follow links, help please
From http://digital.library.okstate.edu/encyclopedia/entries/P/PI007.html Many of the objectives of this expedition were fulfilled. In 1806 Wilkinson ordered Pike and an ill prepared party of twenty-two to seek the headwaters of the Arkansas and Red Rivers, obtain the return ...
September 15, 2014

Physics
v = 5 - 9.8 t 0 = 5 - 9.8 t t = 5/9.8 = .51 seconds to top where v = 0 average speed going up = 5/2 = 2.5 m/s h = 1.5 + 2.5 * .51 = 2.78 meters (a) no way (b)The same speed it will have if dropped from the top of the wall and landing on a platform 1.5 m high 3.95 - 1.5 = 2.45 ...
September 15, 2014

Math
Yes.
September 15, 2014

Math
27/9 =
September 15, 2014

college algebra
.08 x + .04(29,000-x) = 1680
September 15, 2014

general knowledge
I bet you mean 15 sept in which case type: TODAY
September 15, 2014

8th grade math
5^2/5^5 = 1/5^3 = 5^-3 = 1/125
September 15, 2014

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