Tuesday
August 23, 2016

Posts by Damon

Total # Posts: 26,757

Math
x and x+5 x(x+5) = 6 x^2 + 5 x - 6 = 0 (x-1)(x+6) = 0 x = 1 or -6 if x = 1 x+5 = 6 and if x = -6 x+5 = -1
May 4, 2016

Parametric Curve
LOL e is a horizontal line, y = 5 b is a parabola, do what I suggested.
May 4, 2016

Parametric Curve
Well, I suppose if you do not see it as is, you can do x and y for example in (a) y = 4t-2 x = t+1 so t = x-1 y=4(x-2) - 2 y = 4 x -10 dx/dt=dy/dt = 0 so constant speed (d) If you do no see it is a circle, do the same thing again y = (2t+1) cos t y^2 = (2t+1)^2 cos^2 t x^2 = (...
May 4, 2016

math nid this asap tyy
m g h = (1/2) m v^2 h = v^2/2g v the same v^2 = 2 g h 2 * 9 .8 * 2.35 = 2 * 1.6 * h h = 14.4 meters
May 4, 2016

PLEASE HELP WITH ALGEBRA
You have 185 bands in the box pink 95/185 = 19/37 brown 90/185 = 18/37
May 3, 2016

0 through 10 is 11 spaces
10 equal sections from 0 to 10 ??? No, that is 11 1 to 10 would be ten sections 3 or 6 or 9 means answer = 3/11
May 3, 2016

Math
LOL, I will never say.
May 3, 2016

Math
21^2 = 441 22^2 = 484 23^2 = 529
May 3, 2016

Physics
well, I get 1.47*10^2 Joules Yes, work done = change in kintic energy
May 3, 2016

Physics
work = force * distance in direction of force 150 J = 10 d d = 15.0 m
May 3, 2016

Maths yr 6
(4/5) hr/manhouse * 3 man = 12/5 hr/house = 2 2/5 hr = 2.4 hr
May 3, 2016

statistics
50 shipped first one ok 29/50 second one 28/49 third one 27/48 etc down to eight of them then multiply
May 3, 2016

history
In question 5 I do not think the act was about age requirements but it was about racial discrimination. It allowed people of all races to register to vote and vote, and that includes primary elections.
May 2, 2016

check for typos
length or height? How many feet is A ?
May 1, 2016

Math
I already went through trying to draw a 60, 60, 60, 90 triangle with this student.
May 1, 2016

Math
You are welcome :)
May 1, 2016

Math
whew, finally someone got one right !!! :)
May 1, 2016

MATH
NO, To make D you need three 60 degree angles and a 90 degree angle. Try to draw that.
May 1, 2016

MATH
An equilateral triangle has three 60 degree angles. That leaves no corner for a 90 degree angle.
May 1, 2016

baloney
Please check for typos !! If you used length, width and thickness you probably mean ft^3 not ft^2. That messed you up big time when you wrote 144 which is square inches per square foot. What you want is CUBIC feet per CUBIC yard which is 3^3 = 27 ft^3/yd^3 ( despite the fact ...
May 1, 2016

mathematics-change of subject of the formula
(A/pi)^2 = r^2 (h^2-r^2) =-r^4+h^2r^2 r^4 - h^2 r^2 + (A/pi)^2 = 0 r^2 = [h^2 +/-sqrt(h^4-4A^2/pi^2)]/2 r = sqrt { [h^2 +/-sqrt(h^4-4A^2/pi^2)]/2 }
May 1, 2016

Math
(x-11)^2 = r^2 = x^2 - 22 x + 121 so I do not get d
May 1, 2016

math
.75 miles/4.5 min *60 min/hr = 10 mi/h
May 1, 2016

typo
If it grows exponentially you mean 15,000 * 1.07^x in other words compounding not 1.07 x In that case C is correct 1.07^12 = 2.25 A rough estimate to remember is that 7 percent compounded for ten years is about a doubling.
May 1, 2016

CONVERSIONS
there are 9 ft^2/ yd^2 because 3*3 is 9
May 1, 2016

MEASUREMENTS
0.254296875 mi^2 if it is really 162.75 acres If however that is a typo and you mean 1642.75 acres then 2.566796875 mi^2
May 1, 2016

Math - typo ?
4y = 3 x y = .75 x + 0 slope = +.75 line is not in quadrant 2 but in one or three
May 1, 2016

math
You could just as easily lose 5 or more as win five or more. The triangle is symmetric about that middle point note C = 252 for point C10,5 then 210 to the left and 210 to the right. The middle point can go either way Too bad you had an even number of questions :) That is what...
May 1, 2016

Ms Sue, not symmetric. Could get 5 wrong !
Note my check comment
May 1, 2016

math
note that if I split the probability of getting 5 right in half I would get .123 less which would be .5 :) (good check)
May 1, 2016

math
binomial distrution p(5) = C(10,5).5^5 .5^(10-5) = 252*.5^10 = .246 p(6 ) = C(10,6).5^6 .5^4 = 210 * .5^10 = .205 p(7) = 120 * .5^10 = .117 p(8) = 45 * .5^10 = .044 p(9) = 10 * .5^10 = .01 p(10) = 1 * .5^10 = .001 now add .623
May 1, 2016

math trick question
The same as the supplement of a supplement :)
May 1, 2016

math
a/b = b/(a-b) b^2 = a^2 - ab a^2 - ab -b^2 = 0 a = [b +/- sqrt(b^2 +4 b^2) ]/2 a = b [ 1 + sqrt 5 ]/2 a = 1.618 b sure enough now 3.7 could be a or b if b = 3.7 then a = 5.99 about 6 if a= 3.7 then b = 2.29 about 2.3
May 1, 2016

math-middle school
well, I suppose in some world B could be a negative angle, but not in ours.
May 1, 2016

7 th grade math
14/20 = 7/10 = 0.70 0.70 * 300 = 210 0.70 * 100 = 70 0.70 * 240 = 168
May 1, 2016

Calculus
k = P V^1.4 k = 40 * 14^1.4 k = 1609 so P = 1609 V^-1.4 dP/dt = 1609 (-1.4)(V^-2.4) dV/dt = -2253 (14)^-2.4 * -1 = 4 psi/s
May 1, 2016

Math
speed = 70+80 = 150 distance = 300 time = 300/150 = 2 h
May 1, 2016

physics
3000 * v = 15 * 1.5
May 1, 2016

Math NEED HELP!!!!!!
http://www.mathsisfun.com/geometry/construct-linebisect.html
May 1, 2016

Math
4*8 = 32 1*2 = 2 32/2 = 16
May 1, 2016

physics
185 * 8 = 1480 Joules 1480 Joules = 3537 cal
April 30, 2016

Chemistry
How many molecules do you have? Well how much mass in a mol? 3*12 + 7*1 + 16 + 1 = 60 grams for 6.022*10^23 molecules so we have 6.022*10^23 * 85.9/60 = 8.62*10^23 molecules each of those molecules has 3 carbon atoms 3*8.62*10^23 = 25.9 *10^23 =2.59 * 10^24 carbon atoms
April 30, 2016

physics
Fx = -a x^4 I assume you mean F= -25 x^4 dW = F dx = -25 x^4 dx W = -(25/5)x^5 at x = 1.25-at.75 W = -5 (1.25^5 - .75^5)
April 30, 2016

Maths
try reading here: http://www.mathsisfun.com/algebra/factoring.html
April 30, 2016

math
Yes, to do it on the number line start at 0 go left 8 to - 8 go right 14 to +6
April 30, 2016

check list of answers below
This has been asked over and over and over again, look below.
April 30, 2016

typo
You mean V = (4/3) pi r^3 dV/dt = (4 pi r^2) dr/dt (You really do not need calculus. It is the surface area times dr/dt)
April 30, 2016

MATH
No, because 3+5 = +8 , not 15
April 30, 2016

math
-9 + 5 + x = -1 -4 + x = -1 x = +3
April 30, 2016

MATH
-4 - 2 = -6
April 30, 2016

Geography -Yr10
During the second half of the 19th century, river shipping was of great importance, but, with growing competition from railways and demand for irrigation water (first used at Mildura in 1886), navigation practically ceased. ================================ In other words they ...
April 30, 2016

Math
weight at top = 15 -.1*50 = 10 average weight = (15+10)/2 = 12.5 12.5 * 50 = 625 ft pounds
April 30, 2016

Math
You are welcome.
April 30, 2016

Math
No, same answers both ways.
April 30, 2016

Math
I used the kinematics because I did not know if you knew how to integrate velocity to get distance.
April 30, 2016

Math
oh well v(t)= 38-2t or dx/dt = 38 - 2 t then x = c + 38 t - (1/2)(2)t^2 c = x when t = 0 call it 0 here x = 38 t - t^2
April 30, 2016

Math
I do not know if you know calculus or if you have kinetatic equations in your text. What we have here is a constant acceleration of -2 ft/s^2 a. 0 = 38 - 2 t 2 t = 38 t = 19 s b. d = Vi t + (1/2) a t^2 = 38 (19) - 19^2 = 19(19) = 361 feet or use average speed for 19 seconds...
April 30, 2016

Math
yes, circumference = pi D = 8.4 pi
April 30, 2016

Geometry
yes, If you use google search type in 45 yards = cm and see what happens
April 30, 2016

math
.6 * 255.5 = 153.3 leaked out .3 oz/s * t = 153.3 oz t = 153.3 /0.3 = 511 seconds
April 30, 2016

Rt
31+n = 2(7+n) 31 + n = 14 + 2 n 17 = n so in 17 years then check 7 + 17 = 24 31 + 17 = 48 sure enough twice 24
April 30, 2016

Geography - Yr10
Note particularly : " .....From the 1970s the emphasis changed to community facilities such as libraries and parks, maintenance of local roads, town planning and development approvals, and local services such as waste disposal. Child care, tourism and urban renewal were ...
April 29, 2016

Geography - Yr10
I see from your other question about Murray River that you are probably in Australia. I know little about Australia, being from Massachusetts in the USA but perhaps look here: http://en.wikipedia.org/wiki/Local_government_in_Australia
April 29, 2016

Math (please help)
(1/4)in * 6 ft/in = 1.5 ft/side so 2.25 ft^2 /square Bathroom = 2.25*6=13.5 ft^2 Bedroom = 2.25*20= 45 ft^2 Living room = 2.25*28=63 ft^2 tiny house a. 5 * 13.5 b. (18/9)(45+63) c. tile is $5/ft^2, carpet is $2/ft^2
April 29, 2016

science
Did it start at zero speed? If so 300 = (1/2) a t^2 = .5 a *225 a = 600/225
April 29, 2016

math
(4/3)x - 4 - (6/5)x + 9 (20/15)x - (18/15) x + 5 (2/15) x + 5
April 29, 2016

physics
The speed is constant. All you need is the vertical component. (30/4) cos 45
April 29, 2016

math
new length = 15+x new width = 12+x so the last one
April 29, 2016

Pre Calculus
L = 13 - 2x w = 11 - 2x V = (13-2x)(11-2x)x V = (143 - 48 x + 4 x^2)x V = 4 x^3 -48 x^2+143 x find where dV/dx = 0 0 = 12 x^2 - 96 x + 143 x = [ 96 +/- sqrt(9216-6864)]/24 x = [96 +/- 48.5 ]/24 x = 1.98 in or x = 6.02 (too big, no width left) so about 2 inches high
April 29, 2016

physics
.388 kg ice melt it and warm it to 45 C .388 [ 333,000 + 45(4186) ] = 202,292 Joules into what was ice = m [2256,000 + 55(4186) ] = 2,486,230 m m = 202,292/2,486,230 = .0814 kg = 81.4 grams
April 29, 2016

Maths
each pipe does one tank/12 hr call that 1 tank/12 hr pipe 1 tank/12hrpipe * 4 pipe * 2 hr = (8/12) tank = 2/3 of a tank
April 29, 2016

Math
835 cm / 15 cm = 55 2/3 55 pieces + 2/3 * 15 = 10 cm left over
April 29, 2016

maths
100 - 30 = 70 .7 * 60 = 42
April 29, 2016

Physics
I assume you made a typo and mean 1.6 * 10^15 Liters 1 liter water = 1 kg a pint is a pound the world around :) m g h = 1.6*10^15 kg * 9.81 m/s^2 * 143 m = 2245 * 10^15 = 2.245 * 10^18 Joules
April 29, 2016

Math
probability that she sees a bird on any old day = 18/30 = 0.6
April 28, 2016

huh?
180 was the answer, .3 * days 420 is days you do NOT hear thunder.
April 28, 2016

college mathematics
yes --- angle side angle
April 28, 2016

college mathematics
yes --- side side side
April 28, 2016

homework
assume you mean x^(8/9) pi y^2 dy from y = 0 to y = 1 pi x^(16/9) dy but dy = (8/9) x^-(1/9) dx so (8/9)pi x^(15/9)dx from 0 to 1 (8pi/9) (9/24)x^(24/9) (8 pi/24) = pi/3
April 28, 2016

Physics
I guess you mean north of east and east of north east = 1000 cos 40 + 500 sin 20 north = 1000 sin 40 + 500 cos 20 east = 937 north = 1113 distance = sqrt(937^2+1113^2) tan angle north of east = 1113/937
April 27, 2016

Math
width = 1.5 1.5 * 3 * 6 = 18+9 = 27 ft^3 which is one cubic yard
April 26, 2016

Science
calibrate it. Mark points on it that are he same temp as the real thermometer shows, say in cold water and hot.
April 26, 2016

Math
7 * 2.5 * h = 175 h = 10
April 26, 2016

math
Can not, sorry, rules.
April 26, 2016

math
Note above that she answered a question at 6:41 EDT
April 26, 2016

math
Your guess is as good as mine.
April 26, 2016

math
1, 89 , 67 , 89 , 7, 5 , 45 , 7
April 26, 2016

math
What do you mean? They all are except 0.
April 26, 2016

math
I suppose
April 26, 2016

math
Hi neighbor
April 26, 2016

math
1*1*5/(2*2*6) = 5/24
April 26, 2016

Math
I said 280 + 4 w = 420 so 4 w = 140 w = 35 mph wind speed now go back and get v
April 26, 2016

Math
v = 140 + w (140+2w)2 = (140 +w -w )3 = 420 280 + 4 w = 420 etc
April 26, 2016

math
we need something else with y = 16 and with x = 4 so (4,16) DRAW IT !!!!!!!!
April 26, 2016

Calculus
how far apart are they ? t in hours sqrt (x^2 + y^2) =sqrt [(50t)^2 + (60 t)^2] so d = (2500 + 3600)^.5 t d = 78.1 t so separation speed is 78.1 mph all the time
April 26, 2016

math
well they have to add up to one and there are 6 sides p(1) = n prime p(2) = 2n prime p(3) = n prime p(4) = 2n p(5) = n prime p(6) = 2n sum of p s is one 9 n = 1 n = 1/9 primes are 5n or 5/9
April 26, 2016

physics
Angular momentum after = angular momentum before angular momentum before = I w = 1.4*10^-3 * .33 = .462 * 10^-3 angular momentum after = (1.4*10^-3 + 4.2*10^-3) w so w = .462/5.6 = .0835 rad/s
April 26, 2016

History
Actually I think the historical advantage of rivers is that you can float down them easily and if the wind happens to blow up river commonly, you can get up the river easily as well. (the Nile :)
April 26, 2016

History
In fact, more often than not, rivers are more like highways than barriers. Of curse as you know I feel the same way about oceans, but that is because I use them.
April 26, 2016

math
c(27)= 10 * 27 + 26 = 270+26 = 296 so (27 , 296) c(39) = 10*39 + 26 = 390+26 etc
April 26, 2016

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