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March 27, 2017

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Posts by Damon

Total # Posts: 29,631

Math
6 out of 20 do not like it. 6/20 = 30/100 or 30%
February 9, 2017

mathematical literacy
2 of cement 2 of lime 2*5 = 10 of sand 2 of water
February 9, 2017

history please help! Check my answers!
Flowers are major, and are only in the third choice, so yes, right.
February 9, 2017

math
ah 40,000 (1.07)^2
February 9, 2017

math
h = 9 - (x+3)^2 = 9 - x^2 -6 x - 9 = -x^2 - 6x slope = dh/dx = -2x -6 zero when x = -3 curvature = d^2h/dx^2 = -2 so that is a maximum then what is h? -x^2 - 6 x = -x (x+6) when x = -3 3 (3) = 9 which we could have said in the beginning because x^2 is always + so 9-x^2 is ...
February 9, 2017

PHYSICS
u = 1.12 forever Vi =initial vertical velocity = 0 v = Vi - 9.81 t h = Hi + Vi t - 4.9 t^2 h = 27.8 - 4.9 t^2 0 = 27.8 - 4.9 t^2 so t = sqrt (27.8/4.9) use that t to get horizontal range x = 1.12 t
February 9, 2017

physics
t cos 52 = (24/2)9.81 = 12*9.81
February 9, 2017

History - please check my answers
1. I would include the check on gov power 2. The First amendment is about Congress NOT MAKING A LAW ABRIDGING the right of the people peaceably to assemble. I am not aware of anything about public versus private property in the First Amendment, although there is case law on ...
February 9, 2017

calculus
64 = (4/3)pi R^3 from that find R dV = surface area * dR (easy way :) so dV/dt = 4 pi R^2 dR/dt 20 in^3/min = 4 pi R^2 dR/dt solve for dR/dt
February 9, 2017

Calculus review
arc tan t where t = x^2 so arc tan x^2 (it is how fast the area is changing at the right side of the area, the high limit of t)
February 9, 2017

Geometry
Diameter = 4' radius = 2' = 24 inches Area = pi r^2 = 576 pi in^2
February 9, 2017

Math
r+4 = 2(a+4) or r - 2a = 4 You need to know something more.
February 9, 2017

maths
(5/8)(152) = 5*19 = 95
February 9, 2017

Physics
does the water just stop or continue moving with the child? it it continues moving on the child for an instant, you have 90 kg, not 30
February 9, 2017

Math
Do + Da = 41 Do + 5 = 2(Da+5) 41 - Da + 5 = 2 Da + 10 etc
February 9, 2017

Math
LOL, subtract 3 from the answers to the question above.
February 9, 2017

physics
luckily a right triangle with legs of 3 and 4 has a hypotenuse of 5 so there is no need to use c^2 = a^2 + b^2 to get the magnitude. The cosine of the angle south of west is 3/5 so the angle is 53.13 degrees south of west which is 180 + 53.13 degrees counterclockwise from the ...
February 9, 2017

physics
west = 2.5 km south = 10 km magnitude = sqrt(6.25 +100) tan of angle south of west = 10/2.5 = 4 angle south of west = 76 degrees south of west
February 9, 2017

Math - Derivatives
dy/dx = x^3 +2x^2 -5x +6 = 12 x^3 + 2 x^2 - 5x -6 = 0 x = -3 , -1 , +2 http://www.wolframalpha.com/widgets/view.jsp?id=b858339e64fa997454dd12f77cb1ece1
February 9, 2017

physics
32 s more,
February 8, 2017

Math 8th grade
well six one hours plus 2 half hours = 7 hours
February 8, 2017

Algebra
.5 D + 1 B </= 6
February 8, 2017

Math
T = L + 19 T + 4 = 2 (L+4) =================== L+19 + 4 = 2 L + 8 L = 15 T = 34
February 8, 2017

Oh maybe it means
does not do 40 for the whole 20 sec, but only for 20 - 4 = 16 s so 100 + 40*16 = 640 + 80 = 820 ..... not a choice though.
February 8, 2017

physics
The trick is to use average speed for a time of constant acceleration v = Vi + a t Vf = final v = Vi + a t Vf -Vi = a t so a = (Vf -Vi)/t d = Vi t + .5 a t^2 d = Vi t + .5 (Vf-Vi)t^2/t d = Vi t -.5 Vi t + .5 Vf t d = .5(Vi+Vf) t BUT .5(Vi+Vf) IS the average speed during ...
February 8, 2017

physics
average 20 for first 5 so 100 m go 40 for 20 s so 800 more now brake average 20 for 4 = 80 980 so I agree
February 8, 2017

math
What does full mean? Multiply by 3 every day? That is called geometric sequence http://www.mathsisfun.com/algebra/sequences-sums-geometric.html Say A is amount on day 1 then on day 12 you have A(3)^11 and on day 4 you have A(3)^3 3^11/3^3 = 3^8 = 6561 so you have 6561 times as...
February 8, 2017

World history
LOL, I guess you would not have a list of answer choices for this. In fact this requires at least a bookcase full of history texts and research papers and I am not sure how to do anything but point you to a few web sites. I guess start with the rivers (Tigris and Euphrates) ...
February 8, 2017

Math
-3 / (1/2) = -3(2/1) = -6/1 = -6
February 8, 2017

Maths
common multiple 5 2*2*2 2*2*3 need 5 2 2 2 3 120
February 8, 2017

Math
lol, square has at least 4 how many does a circle have ? ;)
February 8, 2017

Maths
alpha^.5 = [b +sqrt(b^2-4c)]/2 beta^.5 = [b -sqrt(b^2-4c)]/2 alpha =(1/4) [ b^2 +2bsqrt(b^2-4c)+b^2-4c] beta =(1/4) [ b^2 -2bsqrt(b^2-4c)+b^2-4c] alpha + beta = (1/4) [4 b^2 -8 c] = b^2 - 2 c etc ....
February 8, 2017

physics
10^4 km = 10^7 meters !!!! well the force on 1kg is the value of g there :) F = G * 1 * M /R^2 F =6.67*10^-11 * 6 *10^6 /(16*10^14) I think you probably have a typo
February 8, 2017

Math
-5 = -a+b-c dy/dx = 3 a x^2 + 2 b x + c = 4 at x = -1 so 3a - 2b + c = 4 d^2y/dx^2 = 0 = 6ax +2b = -6a+2b so b = 3 a 3 a -6a + c = 4 -5 = -a +3a -c -3a + c = +4 +2a - c = -5 ------------ 5 a = 9 etc check my arithmetic
February 8, 2017

Math Independent & Dependent.
the cost depends on how many c = 7 s http://nces.ed.gov/nceskids/help/user_guide/graph/variables.asp
February 8, 2017

Calculus unit review
draw a graph point A is (1/11) f(5) = f(1) + integral 1 to 5 (f' dx) = 11 + 9 = 20 or just say integral from 1 to 5 of (dy/dx) dx = y(5)-y(1)
February 8, 2017

Math
before x students 5x/8 boys and 3x/8 girls so later 3x/8 + 6 = 5x/8 3 x + 48 = 5 x 2 x = 48 so x = 24 students before x+6 = 30 after 6 girls arrived
February 8, 2017

how many minutes
hours = minutes/60 speed = 63 miles/those hours
February 7, 2017

math
1.20 x
February 7, 2017

Math
(7/8)(16/1) = 7*16/8 = 7*2 = 14
February 7, 2017

Math
hat is zero at -3, -3 , 2 ,2 , -5 the double roots mean the curve just touches the axis at: -3 and +2 when x is big positive, it is big positive when x is big negative it is big negative y = 180 when x = 0 so starts at lower left crosses x axis at x=-5 goes up then dips down ...
February 7, 2017

Physics
total energy is constant until it hits the ground. Potential turns to kinetic. m g h = 8 * 9.81 * 100 Joules
February 7, 2017

History
I am inclined to agree with you. See: http://en.wikipedia.org/wiki/Freedmen's_Bureau_bills although in practice it turned out more like B and even that was undermined by the KKK etc.
February 7, 2017

Math - limits
in radians sin t --> t + t^2/2! -t^3/3!..... so in radians sin t/t --->1 as t--->0 however we are doing degrees do t degrees which is (pi t/180) rad so we have sin (pi t/180) /t which becomes (pi t/180 +(pi t/180)^2/2 ... divided by t ----> pi/180 as t--->0...
February 7, 2017

Math
15/12 = 5/4
February 7, 2017

Math
agree
February 7, 2017

Math
1 / 3
February 7, 2017

math
Smith: 1 teen drinks 2/3 case / 5 weeks so 1 teen drinks 2/15 case / 1 week ===============================Jones 1 teen drinks 5/6 case / 4 weeks so 1 teen drinks 5/24 case / 1 week ======================== smith 2/15 jones 5/24 which is bigger? 15 = 3*5 24 = 3 * 8 3*8*5 = 120...
February 7, 2017

math
Once again 192 - 150 = 42 NOT 142
February 7, 2017

Social studies
ok :) Then I agree with you.
February 7, 2017

spelling ?
mass crowding maybe? If so yes.
February 7, 2017

error
192=k+54c............................. (1) 150=k+14c. ........................... (2) subtract (1) from (2) 142=40c ============================= whoops 42 not 142
February 7, 2017

physics
mg + mv^2/r = 1000 Newtons g = 9.81 m/s^2 v = 7.4 m/s r = 11.2 m solve for m
February 7, 2017

statistics
http://davidmlane.com/hyperstat/z_table.html
February 7, 2017

Physics
yes, true power = V i but V = i R so Power = i^2 R = V^2/R Joules per second or "Watts" Energy (or heat) = Power * time so indeed H = i^2 R t = V^2/R Joules Now how much heat do we need? H = mass * specific heat * change in temp H = 0.5 * 4.19*10^3 * 70 Joules so in ...
February 7, 2017

Science
x = sin (2 pi t/T) 1/2 = sin (2 pi t/24) 2 pi t/24 = pi/6 because pi/3 radians= 30 degrees and sin pi/6 = 1/2 t/12 = 1/6 t = 2
February 7, 2017

Math
L = 31.5 w = (4/7)31.5 = 18 p = 2 * 31.5 + 2 * 18 A = 31.5 * 18
February 7, 2017

Science
force = change in momentum/time 10 N = 10 kg *V / 10 s V = 10 m/s ============= or F = m a 10 = 10 a a = 1 m/s^2 v = a t v = 1*10 = 10 m/s
February 7, 2017

physics
v = a t 100 m/s = a ( 5 s) s = 20 m/s^2
February 7, 2017

Physics
By the way, GOOGLE Archimedes
February 6, 2017

Physics
weight in water = WW Newtons weight in air = WA Newtons mass = WA/9.81 kilograms (if your scale reads in kilograms, multiply by 9.81 m/s^2 on earth to get Newtons) difference = WA-WW = buoyant force = volume*density of water * 9.81 density of water = 1,000 kg/m^3 so difference...
February 6, 2017

algebra
typo maybe?
February 6, 2017

algebra
you have 0k so you can not solve for k
February 6, 2017

physics
a = dv/dt = 6.24 so v = constant + 6.24 t at t = 0, v = Vi so v = Vi + 6.24 t 9.36 = Vi + 6.24 * .44
February 6, 2017

Math
think ! 1. It starts in 1990 at 1,000,000 2. it DECREASES and you meant to the POWER t, not times t a k^t not a k t to check at 2010, t = 20 years y = 1,000,000* .98^20 ?
February 6, 2017

order does matter, typo by me
Write the number of permutations in factorial form, then simplify. How many differnet ways can you and four of your friends sit in the backseat of a limousine? A. 4!;24 b.4!120 C.5! 120 D. 5! 720 There are 5 of you. Order does matter so permutations of 5 taken 5 at a time 5! =...
February 6, 2017

PLLZ!PLLZ help with math quick!!!!!
Ariel wants to choose 5 players for her basketball team. There are 7 players to choose from.How many different teams can Ariel make? A. 21 B.32 c.42 D.56 =============================== combinations in grade seven? C(n,r) = n!/[r!(n-r)!] = 7!/[5!(2!)] = 7*6/2 =21...
February 6, 2017

enough already
I already answered most of these.
February 6, 2017

Math
24 x^2 = 3*4.5 = 13.5 x^2 =13.5/24 so x^2 = .5625 feet^2 *144 in^2/ft^2 = 81 inches^2 so 9 inches on a side
February 6, 2017

Algebra
sketch graph at x = -oo it goes to -oo at x = -1 it is +6 at x = 0 it is-2 at x = +oo it is +oo SO it crosses the x axis three times, three real roots
February 6, 2017

Math PROBABILITY part 1
3/36 = 1/12 are less than 4 1,1 1,2 2,1 ================== IF you mean < or = 4 THEN 6/36 = 1/6
February 6, 2017

Math PROBABILITY part 1
1 though 6 horizontal and 1 - 6 verrtical chat 36 possible rools 9 have up two odd 9/36 = 1/4 so I bet B
February 6, 2017

Math PROBABILITY part 1
4/9 + 7/18 + x = 18/18 15/18 + x = 18/18 x = 3/18 = 1/6 which is a
February 6, 2017

Math PROBABILITY part 1
yes, 5/8 yes 4/9 next, problems
February 6, 2017

PHYSICS
1.3*.4 = .52 .7*.4 = .28 total distance = .8 total time = 1.1 av speed = .8/1.1 = .73 m/s
February 6, 2017

math plzzz help quick
You are welcome.
February 6, 2017

math plzzz help quick
2x = y-14 so -4x = -2(y-14) = -2y + 28 use that for -4x in equation 2 (-2y+28) - y = 4 -3 y = -24
February 6, 2017

physics
Vi = 14 a = -3.3 v = Vi + a t at stop, v = 0 0 = 14 - 3.3 t 3.3 t = 14 for half time if t = 7/3.3 v = 14 - 3.3 (7/3.3) v = 14 - 7 = 7 on the nose then
February 6, 2017

math plzzz help quick
yes
February 6, 2017

math plzzz help quick
rewrite first one x = y -11 use that for x in the second one y + 7 = -2(y-11) y + 7 = -2 y + 22 3 y = 15 y = 5
February 6, 2017

Algebra
divide by factor (x+2) (x^3 – 3x^2 – 6x + 8)/(x+2) = x^2-5x+4 which is (x-4)(x-1) so 4 and 1
February 6, 2017

electricity
15 = 60R/(60+R) 900 + 15 R = 60 R 45 R = 900
February 6, 2017

Physics
m v^2/R = 600 0.8 v^2/0.9 = 600
February 6, 2017

modern worl studies connexus
6 NO WAY!!! 9 Canada has its own monarch ??? First I heard of it, and I row against them up there in Nova Scotia.
February 6, 2017

math
4 works for 1, 4 or 4 people 6 works for 1, 2 , 3 or 6 people
February 5, 2017

math
READ That was the CHECK James is 48
February 5, 2017

math
Jo + 5 = Ja/3 Jo - 3 = Ja/6 -------------- subtract 0 + 8 = Ja(1/3 - 1/6) Ja (2/6-1/6) = 8 Ja = 6*8 = 48 =========================== check Ja = 48 Jo = 3 + Ja/6 = 3 + 8 = 11 then 11+5 = ??? 48/3 16 = 16 sure enough
February 5, 2017

need info
Please type entire problem. Without knowing the density of the logs or the mass of you and your friend, no way. call log density rho call g = 9.81 m/s^2 water density = 1000 kg/m^2 mass of passengers = m n = number of logs n * .13^2 *2.2 = V, needed volume of logs 1000 g V = B...
February 5, 2017

mechanics
F1 = f in x direction F2 = f cos 60 in x and f sin 60 in y total x = f +f cos 60 = 1.5 f total y = f sin 60 = [sqrt3/2]f magnitude of resultant = sqrt [ 1.5^2 f^2 + 3/4 f^2 ] = f sqrt [2.25 +.75 ] = f sqrt 3
February 5, 2017

Phycis
(1/2 )m v^2 + m g h = 1470 so Ke = 1470 - m(9.81)25 to get a numerical answer you need to know m
February 5, 2017

Physics
with constant acceleration a: v = Vi + a t x = Xi + Vi t + (1/2) a t^2 here Vi = Xi = 0 so x = (1/2)at^2
February 4, 2017

math
Fid = Fif + 26 Fif = R-12 so R = Fif+12 Fid + Fif + R = 71 Fif+26 + Fif + Fif+12 = 71
February 4, 2017

physics
2.2*10^4 = mg + ma =2150(9.81+a)
February 4, 2017

Calculus
http://www.jiskha.com/display.cgi?id=1486194050
February 4, 2017

value
75/3 = 25
February 4, 2017

distance ?
You have to know some distance in the problem. Otherwise you just have similar triangles of arbitrary size.
February 4, 2017

maths
well, go ahead. 30, 60, 90 triangle side opposite 30 = 5.6 sin 30 side opposite 60 = 5.6 sin 60
February 4, 2017

Calculus
tangent of angle above x axis = 35/42 magnitude = sqrt (42^2+35^2)
February 4, 2017

Math
0 to 9
February 4, 2017

Physics
F = G Mm m /Rm^2 F/m = G Mm/Rm^2 = 6.67×10-11 m^3 kg-1 s-2 * 1.08*10^16kg/[1.35*10^4]^2m^2
February 4, 2017

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