Tuesday
February 21, 2017

Posts by Damon

Total # Posts: 29,370

differential equation
Oh, yes, the diff eq which everyone already knows the solution for da/dt = -ka da/a = - k dt ln a = -kt a = A e^-kt
October 2, 2016

please type the whole problem
How many after 2.5 ? x = Xi e^-kt x = 75 e^-2.5 k ln(x/75) = -2.5 k k = ln(x/75)/(-2.5) solve for k so ln .5 = -k t solve for t
October 2, 2016

Physics
m v^2/r
October 1, 2016

Physics
angle pushes car toward center, centripetal
October 1, 2016

physics
you do not say what the question is average rpm during stop = 1150 turns to stop = 1150 *2.9/60 original radians/s = 2300 revs/min*2 pi rad/rev *1min/60 s = 241 radians/s angular acceleration = -241/2.9 whatever
October 1, 2016

Math
10 x + 15 y = 2500 y = 195-x 10 x + 15(195-x) = 2500 10 x + 2925 - 15 x = 2500 5 x = 425 x = 85 y = 195-x = 110
October 1, 2016

Math
70*400 = 28,000
October 1, 2016

Pre Cal help please!!
given f(x) = { 2x^2 + 5 x < or equal to 2 3 - x^2 x > 2 What???? Perhaps you mean: given f(x) = 2 x^2 + 5 when x < or equal to 2 3 - x^2 when x > 2 if x is slightly bigger than 2 3 - 4 = -1 if x is slightly smaller than 2 OR if x is 2 then 2(4) + 5 = 8+5 = 13
October 1, 2016

Physics
24.5 x = 85.5(11.6-x)
October 1, 2016

Physics
I guess an intercontinental ballistic rocket is something "thrown over a large distance (on earth)" so 5. What a nutty question though :)
October 1, 2016

maths
(x^3+y^3)(x^3-y^3) (x^3+3x^2y+3xy^2+y^3)*(x^3-x^2y+3xy^2-y^3)
October 1, 2016

Trigonometry
in an hour he goes 1/24 of circumference (1/24)(2 pi *12,000/pi) = 24,000/24 = 1000
October 1, 2016

Physics
fast one takes t = 76/5.2 seconds slow one goes d = 2(76/5.2) so 76 - 2(76/5.2)
October 1, 2016

simpson
http://www.wolframalpha.com/input/?i=solve+dy+%3D+sin(x%5E2)+dx
October 1, 2016

Physics
Ac = v^2/r = 36/2 = 18 m/s^2 m F = M Ac = 51 *18 Newtons weight = 51 * 9.81 Newtons almost 2 g
October 1, 2016

value
change of momentum = .03*600 = 18 average speed = 300 time = .2/300 Force = change of momentum/change of time = 18 *300/.2 Newtons = 90*300 =27,000 agree
October 1, 2016

maths sir-reiny help calculus
Click on the step by step in Wolfram
October 1, 2016

maths sir-reiny help calculus
http://www.wolframalpha.com/input/?i=solve+x+y+dx+%3D+(x%5E2+-x+y+%2By%5E2)dy
October 1, 2016

Algebra
first scoop has 19 choices second has 18 choices cone has 3 choices 18*19*3
October 1, 2016

Probability
first ace 4/54 second ace 3/53 third ace 2/52 first king 4/51 second king 3/50 multiply them
October 1, 2016

whoops
30/54
October 1, 2016

sorry
30/54
October 1, 2016

Math Help!
7/54
October 1, 2016

Science
if near earth surface F = m g = 2.5 * 9.81 N and acceleration is g = 9.81 m/s^2 if at great distance r from earth center you need to do F = 2.5 G Mearth/r^2 so a = G Mearth/r^2
October 1, 2016

math condense logs
ln is log base e 3[ln x-2 ln(x^2+1)]+2 ln 5 ln a - ln b = ln (a/b) n ln x = ln x^n so 3 ln [ x/(x^2+1)^2] + ln 25 ln 25[ x/(x^2+1)^2]^3 so agree with Sam
October 1, 2016

maths asap need help
pi/6 = 30 degrees our lines go though a point 5 units along there from origin x = 5 cos 30 y = 5 sin 30 that 30 degree line has slope sin30/cos30 = .577 the perpendicular has slope -1/.577 = - 1.732 so line is of form y = -1.732 x + b now put in y = 5 sin 30 and x = 5 sin 30 ...
October 1, 2016

Math
1/4 of them seem to be rotten so 25
October 1, 2016

algebra
d = 16 t^2 at t = 6, d = 16*36 = 576 at t = 7, d = 16*49 = 784 784 - 576 = 208
October 1, 2016

Physics
half a period 14 t changes by pi say from 14t = 0 to 14t = pi or t = pi/14
October 1, 2016

Math (Finding points of intersection)
You are welcome.
October 1, 2016

typo
do you mean -x+y = 1 ????? so y=x+1 if so circle with center at (0,0) and radius 1 line through (0,1) and (-1,0) x^2 + (x+1)^2 = 1 x^2 + x^2 + 2 x + 1 = 1 2 x^2 + 2 x = 0 x(x+1) = 0 x = 0 or x = -1 line hits the circle at the x and y axis intersections
October 1, 2016

I am having trouble with this homework question ,
first add those up to see if they add to one Yes, they do so everyone has one of those 4 types THEREFORE probability not O = 1 - probability of O 1 - .53 = 0.47
October 1, 2016

MATH HELP ASAP
Just like the other one there are 7 females with A out of 75 students probability that student is female with A = 7/75 so probability not female with A = 1-7/75 = 0.907
October 1, 2016

MATH 125 help
Hey look, I just did the not a female with A. Now you do this one.
October 1, 2016

Cards Probability
7/13
October 1, 2016

beats me
I wish the math people would stay away from navigation. They are hopeless at distinguishing between bearing and heading and here they evidently think a boat moves with the wind like an airplane forgetting that the hull is in the water sort of like a car on a road in a ...
October 1, 2016

PROBABILITY : M&M'S
Randomly picking what Amanda, two reds and a green in three picks?
September 30, 2016

question incomplete
finish the sentence please
September 30, 2016

PROBABILITY MATH HELP!!!!! DICE
There are 6 sides 1,2,3,4,5,6 three of those are even 3/6 = 1/2 = 0.5
September 30, 2016

Math
17 - 33 = -16 wicked cold around zero Fahrenheit
September 30, 2016

Algebra
9. j-3=-7 A. j=-10 B. j=21 C. j=-4 D. j=4 🔹🔹🔹 NO!!!! add 3 to both sides, result negative
September 30, 2016

Algebra
5. 2/3x=6 A. x=9 B. x=4 C. x=18 D. x=12 🔹🔹🔹 NO, what on earth are you doing?
September 30, 2016

Algebra
4. -2c=-18 A. c=-9 B. c=-36 C.=9🔹🔹🔹 YES THIS TIME
September 30, 2016

Algebra
4. -2c=-18 A. c=-9🔹🔹🔹? B. c=-36 C. c=9 D. c=36 NO!!!!!!
September 30, 2016

Social studies
I agree.
September 30, 2016

Maths,fractions
(6/15 + 5/15 + 4/15)x = x looks like 15 to me. There is no smaller common denominator
September 30, 2016

english
Players usually kick or "head" none :) to their teammates on the field.
September 30, 2016

Is it possible if you guys can check my algebra HW
Yes, it is possible, but what did you do?
September 30, 2016

Is it possible if you guys can check my algebra HW
take x from bag 2 take 3x from bag 1 amount now in bag 2 = 100 - x amount now in bag 1 = 100 - 3x 100 - 3 x = (1/2)(100 - x) 200 - 6 x = 100 - x 5 x = 100 x = 20 so bag 1 = 100 - 3(20) = 40 bag 2 = 100 - 20 = 80
September 30, 2016

Pre alg
y = 3 x-11 x+y = 153 Is that what you mean? If so x + 3x-11 = 153 4 x = 164 x = 41 y= 112
September 30, 2016

math
ROFL !!!!! yes
September 30, 2016

Spanish
I am assuming the first one is asking what someone else is like, not "you" :)
September 30, 2016

Spanish
Even I can do the first one. it is not what is your name it is not how am I it is not how are you What are your answers?
September 30, 2016

English
trust or lack thereof is certainly a theme see http://study.com/academy/lesson/the-death-of-arthur-summary-themes-quiz.html
September 30, 2016

Physics
a = -.8 g v = 4 - .8(9.81) t at v = 0 t = 4/[.8*9.81)
September 30, 2016

Advice and Consent
In the United States the SENATE must approve treaties. The Supreme court can always find anything unconstitutional :) SEE: http://www.senate.gov/general/Features/Treaties_display.htm
September 30, 2016

typo, Pascals
Newtons/m^2 = Pascals
September 30, 2016

Physics
Vi = 30 sin 40 u = 30 cos 40 h = 0 + Vi t - 4.9 t^2 0 = 30 sin 40 t - 4.9 t^2 0 = t (30 sin 40 - 4.9 t) so t = 30 sin 40/4.9 for downrange time range = r = u t r = 30 cos 40 * 30 sin 40 /4.9 = 30^2 sin 80/9.8 so the first one :)
September 29, 2016

History
well B is just as unlikely as C :)
September 29, 2016

typo
5/9 * 4/8 = 20/72 = 5/18
September 29, 2016

maths
susan takes lemon then ann takes lemon: 5/9 * 4/8 = 20/72 = 5/13 susan takes orange then ann takes orange: 4/9 * 3/8 = 1/6 add them
September 29, 2016

Math
3 2/3 = 9/3 + 2/3 = 11/3 17/4 = 16/4 + 1/4 = 4 1/4
September 29, 2016

math
.02 * 30 = original amount of dry cucumber which does not change .11 x = .02 * 30
September 29, 2016

Math hellppp!!
You are welcome.
September 29, 2016

Math hellppp!!
I get your parentheses right (-12/3)*(-8+(-4)^2-6)+2 -4^2 = 16 -8+16-6 = 2 -12/3 = -4 -4* 2 = -8 -8 + 2 = -6
September 29, 2016

Math
so what is 5^3 ?
September 29, 2016

Math
96/2 = 48 48/2 = 24 24/2 = 12 12/2 = 6 6/2 = 3 so 3*2^5 what is 5*5*5 ?
September 29, 2016

Math
let y = f(t)/2.7 to make it easy y = 1.004^t ln y = t ln 1.004 = 0.00399 t e^ln y = y = e^.00399 t so f(t) = 2.7 y = 2.7 e^.00399 t
September 29, 2016

Social Studies Religion
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; ........ If it does not ring a bell, use Google :)
September 29, 2016

History PLEASE CHECK MY WOrK
I agree with you.
September 29, 2016

History
Portuguese owned Brazil. Brazil had manioc. Portuguese took it to Africa. A
September 29, 2016

History
still A Google manioc Portuguese Brazil
September 29, 2016

CHECK MY ANSWERS American Government
1. agree but this ignores alternate path through constitutional conventions. 2. I guess you are right but am tempted by the first choice. I agree with the others.
September 29, 2016

Grammar
....and then there is that subjunctive "would" .... :)
September 29, 2016

History
http://agron-www.agron.iastate.edu/Courses/agron212/Readings/Corn_history.htm by the way American tribes were so thinly spread out that even if every single person one died it would have been just a blip in global population
September 29, 2016

History
Yes A, like corn You are welcome.
September 29, 2016

History
Oh come on! Native Americans did not have gunpowder. The European invaders did. Both had bows and arrows and hatchets. The Spanish horses were their best weapon though. Of course blowguns were kind of unusual in 17 th century Europe but I am not sure that is what we are ...
September 29, 2016

History
B is nonsense. Native Americans did not work out as slaves even here in America. They revolted or died. That is why the European creeps started importing slaves from Africa.
September 29, 2016

Maths
twice 3.50 is 7.00
September 29, 2016

algebra
You are welcome.
September 29, 2016

algebra
well, I write that line under as >/= or </= It does not change your approach and is just like an equal sign. If it is there, leave it there in your answer. </= is leas than or equal >/= is greater than or equal
September 29, 2016

algebra
multiply both sides by 1/2 n > 7 multiply both sides by 5 n > 55 NOW if you multiply both sides by a NEGATIVE number, you turn the arrow around and shoot the other way. multiply by -1/3 and reverse direction y > 6
September 29, 2016

math
e^ix= cos x + i sin x so what we have here is 2 cos pi/4 + 2 i sin pi/4 conjugate is 2 cos pi/4 - 2 i sin pi/4 but cos pi/4 = .5 sqrt 2 and sin pi/4 = .5 sqrt 2 so sqrt 2 - i sqrt 2
September 29, 2016

Typo in units?
I do not believe your lengths. are they all in meters?
September 29, 2016

Social Studies
I agree with you. It hit small farmers in what was then the west hard paying by the gallon but big distillers in the east could pay a flat fee.
September 29, 2016

Physics
time = t distance in meters = 1,000*distance in km distance covered by cheetah = d distance covered by gazelle = d-70 d = 100,000 t d-70 = 80,000 t so 70 + 80,000 t = 100,000 t 20,000 t = 70 t = 7/2000 hours in seconds (3600 s/h) t in seconds = 7*3600/2000 = 12.6 seconds
September 29, 2016

Algebra error repair
What is the product of (–6.8)2? a. –13.6 b. 46.24*** c. –46.24 d. 13.6 ============================= Notation???? what you wrote was (-6.8)(2) which is -13.6 , a. (not d) if you meant to type (-6.8)^2 that is (-6.8)(-6.8) = 46.24
September 28, 2016

Algebra
4. YES!!!! 5. Yes !!! 6. yes !!! 7. yes 8. result is POSITIVE so d is wrong a and b are right
September 28, 2016

Algebra
3. 10/7 * 10/7 = 100/47 so 10/7
September 28, 2016

Algebra
2. + 14 look, -14 * -14 works but so does +14 * +14 by convention though the positive square root is used
September 28, 2016

Algebra
What is the product of (–6.8)2? a. –13.6 b. 46.24*** c. –46.24 d. 13.6 ============================= Notation???? what you wrote was (-6.8)(2) which is 13.6 , d. if you meant to type (-6.8)^2 that is (-6.8)(-6.8) = 46.24
September 28, 2016

physics
v = Vi + a t 23.4 = Vi + 8 t average speed = (Vi+23.4)/2 so t = 9.7/[ (Vi+23.4)/2 ] so 23.4 = Vi + 8*9.7/[ (Vi+23.4)/2 ] solve for Vi
September 28, 2016

physics
h = Hi + Vi t - 4.9 t^2 0 = Hi + 6.22(2.7) - 4.9 (2.7)^2
September 28, 2016

science
you mean 20 m/s^2 I think F = m a = .15 * 20 = 3 N
September 28, 2016

maths /science
v = -9.81 t = -25 so question 2 t = 25/9.81 question 1 d = -4.9 t^2
September 28, 2016

maths/science
just like the other one v = - g t -63.7 = -9.81 t
September 28, 2016

maths
let g = 9.81 m/s^2 then v = -gt = -9.81*7 m/s or if using clunky units g = 32 ft/s^2 v = -32*7 ft/s
September 28, 2016

Math
I do not know what "break apart" means. But if I did not already know the answer I would think 54 = 60 - 6 = 10*6 - 1*6 = (10-1)6 distributive property = 9 * 6 so 9
September 28, 2016

Math
-1 +6 -1 +6 -1 +6 so 20-1 = 19 19+6 = 25 25-1 = 24 24+6 = 30 etc
September 28, 2016

Math
(1/4)(2/3) = 2/12 = 1/6
September 28, 2016

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